/* arch/sparc64/kernel/traps.c
 *
 * Copyright (C) 1995,1997,2008,2009,2012 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1997,1999,2000 Jakub Jelinek (jakub@redhat.com)
 */

/*
 * I like traps on v9, :))))
 */

#include <linux/extable.h>
#include <linux/sched/mm.h>
#include <linux/sched/debug.h>
#include <linux/linkage.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/kdebug.h>
#include <linux/ftrace.h>
#include <linux/reboot.h>
#include <linux/gfp.h>
#include <linux/context_tracking.h>

#include <asm/smp.h>
#include <asm/delay.h>
#include <asm/ptrace.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/unistd.h>
#include <linux/uaccess.h>
#include <asm/fpumacro.h>
#include <asm/lsu.h>
#include <asm/dcu.h>
#include <asm/estate.h>
#include <asm/chafsr.h>
#include <asm/sfafsr.h>
#include <asm/psrcompat.h>
#include <asm/processor.h>
#include <asm/timer.h>
#include <asm/head.h>
#include <asm/prom.h>
#include <asm/memctrl.h>
#include <asm/cacheflush.h>
#include <asm/setup.h>

#include "entry.h"
#include "kernel.h"
#include "kstack.h"

/* When an irrecoverable trap occurs at tl > 0, the trap entry
 * code logs the trap state registers at every level in the trap
 * stack.  It is found at (pt_regs + sizeof(pt_regs)) and the layout
 * is as follows:
 */
struct tl1_traplog {
        struct {
                unsigned long tstate;
                unsigned long tpc;
                unsigned long tnpc;
                unsigned long tt;
        } trapstack[4];
        unsigned long tl;
};

static void dump_tl1_traplog(struct tl1_traplog *p)
{
        int i, limit;

        printk(KERN_EMERG "TRAPLOG: Error at trap level 0x%lx, "
               "dumping track stack.\n", p->tl);

        limit = (tlb_type == hypervisor) ? 2 : 4;
        for (i = 0; i < limit; i++) {
                printk(KERN_EMERG
                       "TRAPLOG: Trap level %d TSTATE[%016lx] TPC[%016lx] "
                       "TNPC[%016lx] TT[%lx]\n",
                       i + 1,
                       p->trapstack[i].tstate, p->trapstack[i].tpc,
                       p->trapstack[i].tnpc, p->trapstack[i].tt);
                printk("TRAPLOG: TPC<%pS>\n", (void *) p->trapstack[i].tpc);
        }
}

void bad_trap(struct pt_regs *regs, long lvl)
{
        char buffer[36];
        siginfo_t info;

        if (notify_die(DIE_TRAP, "bad trap", regs,
                       0, lvl, SIGTRAP) == NOTIFY_STOP)
                return;

        if (lvl < 0x100) {
                sprintf(buffer, "Bad hw trap %lx at tl0\n", lvl);
                die_if_kernel(buffer, regs);
        }

        lvl -= 0x100;
        if (regs->tstate & TSTATE_PRIV) {
                sprintf(buffer, "Kernel bad sw trap %lx", lvl);
                die_if_kernel(buffer, regs);
        }
        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        info.si_signo = SIGILL;
        info.si_errno = 0;
        info.si_code = ILL_ILLTRP;
        info.si_addr = (void __user *)regs->tpc;
        info.si_trapno = lvl;
        force_sig_info(SIGILL, &info, current);
}

void bad_trap_tl1(struct pt_regs *regs, long lvl)
{
        char buffer[36];
        
        if (notify_die(DIE_TRAP_TL1, "bad trap tl1", regs,
                       0, lvl, SIGTRAP) == NOTIFY_STOP)
                return;

        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));

        sprintf (buffer, "Bad trap %lx at tl>0", lvl);
        die_if_kernel (buffer, regs);
}

#ifdef CONFIG_DEBUG_BUGVERBOSE
void do_BUG(const char *file, int line)
{
        bust_spinlocks(1);
        printk("kernel BUG at %s:%d!\n", file, line);
}
EXPORT_SYMBOL(do_BUG);
#endif

static DEFINE_SPINLOCK(dimm_handler_lock);
static dimm_printer_t dimm_handler;

static int sprintf_dimm(int synd_code, unsigned long paddr, char *buf, int buflen)
{
        unsigned long flags;
        int ret = -ENODEV;

        spin_lock_irqsave(&dimm_handler_lock, flags);
        if (dimm_handler) {
                ret = dimm_handler(synd_code, paddr, buf, buflen);
        } else if (tlb_type == spitfire) {
                if (prom_getunumber(synd_code, paddr, buf, buflen) == -1)
                        ret = -EINVAL;
                else
                        ret = 0;
        } else
                ret = -ENODEV;
        spin_unlock_irqrestore(&dimm_handler_lock, flags);

        return ret;
}

int register_dimm_printer(dimm_printer_t func)
{
        unsigned long flags;
        int ret = 0;

        spin_lock_irqsave(&dimm_handler_lock, flags);
        if (!dimm_handler)
                dimm_handler = func;
        else
                ret = -EEXIST;
        spin_unlock_irqrestore(&dimm_handler_lock, flags);

        return ret;
}
EXPORT_SYMBOL_GPL(register_dimm_printer);

void unregister_dimm_printer(dimm_printer_t func)
{
        unsigned long flags;

        spin_lock_irqsave(&dimm_handler_lock, flags);
        if (dimm_handler == func)
                dimm_handler = NULL;
        spin_unlock_irqrestore(&dimm_handler_lock, flags);
}
EXPORT_SYMBOL_GPL(unregister_dimm_printer);

void spitfire_insn_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
{
        enum ctx_state prev_state = exception_enter();
        siginfo_t info;

        if (notify_die(DIE_TRAP, "instruction access exception", regs,
                       0, 0x8, SIGTRAP) == NOTIFY_STOP)
                goto out;

        if (regs->tstate & TSTATE_PRIV) {
                printk("spitfire_insn_access_exception: SFSR[%016lx] "
                       "SFAR[%016lx], going.\n", sfsr, sfar);
                die_if_kernel("Iax", regs);
        }
        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        info.si_signo = SIGSEGV;
        info.si_errno = 0;
        info.si_code = SEGV_MAPERR;
        info.si_addr = (void __user *)regs->tpc;
        info.si_trapno = 0;
        force_sig_info(SIGSEGV, &info, current);
out:
        exception_exit(prev_state);
}

void spitfire_insn_access_exception_tl1(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
{
        if (notify_die(DIE_TRAP_TL1, "instruction access exception tl1", regs,
                       0, 0x8, SIGTRAP) == NOTIFY_STOP)
                return;

        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        spitfire_insn_access_exception(regs, sfsr, sfar);
}

void sun4v_insn_access_exception(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx)
{
        unsigned short type = (type_ctx >> 16);
        unsigned short ctx  = (type_ctx & 0xffff);
        siginfo_t info;

        if (notify_die(DIE_TRAP, "instruction access exception", regs,
                       0, 0x8, SIGTRAP) == NOTIFY_STOP)
                return;

        if (regs->tstate & TSTATE_PRIV) {
                printk("sun4v_insn_access_exception: ADDR[%016lx] "
                       "CTX[%04x] TYPE[%04x], going.\n",
                       addr, ctx, type);
                die_if_kernel("Iax", regs);
        }

        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        info.si_signo = SIGSEGV;
        info.si_errno = 0;
        info.si_code = SEGV_MAPERR;
        info.si_addr = (void __user *) addr;
        info.si_trapno = 0;
        force_sig_info(SIGSEGV, &info, current);
}

void sun4v_insn_access_exception_tl1(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx)
{
        if (notify_die(DIE_TRAP_TL1, "instruction access exception tl1", regs,
                       0, 0x8, SIGTRAP) == NOTIFY_STOP)
                return;

        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        sun4v_insn_access_exception(regs, addr, type_ctx);
}

bool is_no_fault_exception(struct pt_regs *regs)
{
        unsigned char asi;
        u32 insn;

        if (get_user(insn, (u32 __user *)regs->tpc) == -EFAULT)
                return false;

        /*
         * Must do a little instruction decoding here in order to
         * decide on a course of action. The bits of interest are:
         *  insn[31:30] = op, where 3 indicates the load/store group
         *  insn[24:19] = op3, which identifies individual opcodes
         *  insn[13] indicates an immediate offset
         *  op3[4]=1 identifies alternate space instructions
         *  op3[5:4]=3 identifies floating point instructions
         *  op3[2]=1 identifies stores
         * See "Opcode Maps" in the appendix of any Sparc V9
         * architecture spec for full details.
         */
        if ((insn & 0xc0800000) == 0xc0800000) {    /* op=3, op3[4]=1   */
                if (insn & 0x2000)                  /* immediate offset */
                        asi = (regs->tstate >> 24); /* saved %asi       */
                else
                        asi = (insn >> 5);          /* immediate asi    */
                if ((asi & 0xf2) == ASI_PNF) {
                        if (insn & 0x1000000) {     /* op3[5:4]=3       */
                                handle_ldf_stq(insn, regs);
                                return true;
                        } else if (insn & 0x200000) { /* op3[2], stores */
                                return false;
                        }
                        handle_ld_nf(insn, regs);
                        return true;
                }
        }
        return false;
}

void spitfire_data_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
{
        enum ctx_state prev_state = exception_enter();
        siginfo_t info;

        if (notify_die(DIE_TRAP, "data access exception", regs,
                       0, 0x30, SIGTRAP) == NOTIFY_STOP)
                goto out;

        if (regs->tstate & TSTATE_PRIV) {
                /* Test if this comes from uaccess places. */
                const struct exception_table_entry *entry;

                entry = search_exception_tables(regs->tpc);
                if (entry) {
                        /* Ouch, somebody is trying VM hole tricks on us... */
#ifdef DEBUG_EXCEPTIONS
                        printk("Exception: PC<%016lx> faddr<UNKNOWN>\n", regs->tpc);
                        printk("EX_TABLE: insn<%016lx> fixup<%016lx>\n",
                               regs->tpc, entry->fixup);
#endif
                        regs->tpc = entry->fixup;
                        regs->tnpc = regs->tpc + 4;
                        goto out;
                }
                /* Shit... */
                printk("spitfire_data_access_exception: SFSR[%016lx] "
                       "SFAR[%016lx], going.\n", sfsr, sfar);
                die_if_kernel("Dax", regs);
        }

        if (is_no_fault_exception(regs))
                return;

        info.si_signo = SIGSEGV;
        info.si_errno = 0;
        info.si_code = SEGV_MAPERR;
        info.si_addr = (void __user *)sfar;
        info.si_trapno = 0;
        force_sig_info(SIGSEGV, &info, current);
out:
        exception_exit(prev_state);
}

void spitfire_data_access_exception_tl1(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
{
        if (notify_die(DIE_TRAP_TL1, "data access exception tl1", regs,
                       0, 0x30, SIGTRAP) == NOTIFY_STOP)
                return;

        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        spitfire_data_access_exception(regs, sfsr, sfar);
}

void sun4v_data_access_exception(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx)
{
        unsigned short type = (type_ctx >> 16);
        unsigned short ctx  = (type_ctx & 0xffff);

        if (notify_die(DIE_TRAP, "data access exception", regs,
                       0, 0x8, SIGTRAP) == NOTIFY_STOP)
                return;

        if (regs->tstate & TSTATE_PRIV) {
                /* Test if this comes from uaccess places. */
                const struct exception_table_entry *entry;

                entry = search_exception_tables(regs->tpc);
                if (entry) {
                        /* Ouch, somebody is trying VM hole tricks on us... */
#ifdef DEBUG_EXCEPTIONS
                        printk("Exception: PC<%016lx> faddr<UNKNOWN>\n", regs->tpc);
                        printk("EX_TABLE: insn<%016lx> fixup<%016lx>\n",
                               regs->tpc, entry->fixup);
#endif
                        regs->tpc = entry->fixup;
                        regs->tnpc = regs->tpc + 4;
                        return;
                }
                printk("sun4v_data_access_exception: ADDR[%016lx] "
                       "CTX[%04x] TYPE[%04x], going.\n",
                       addr, ctx, type);
                die_if_kernel("Dax", regs);
        }

        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        if (is_no_fault_exception(regs))
                return;

        /* MCD (Memory Corruption Detection) disabled trap (TT=0x19) in HV
         * is vectored thorugh data access exception trap with fault type
         * set to HV_FAULT_TYPE_MCD_DIS. Check for MCD disabled trap.
         * Accessing an address with invalid ASI for the address, for
         * example setting an ADI tag on an address with ASI_MCD_PRIMARY
         * when TTE.mcd is not set for the VA, is also vectored into
         * kerbel by HV as data access exception with fault type set to
         * HV_FAULT_TYPE_INV_ASI.
         */
        switch (type) {
        case HV_FAULT_TYPE_INV_ASI:
                force_sig_fault(SIGILL, ILL_ILLADR, (void __user *)addr, 0,
                                current);
                break;
        case HV_FAULT_TYPE_MCD_DIS:
                force_sig_fault(SIGSEGV, SEGV_ACCADI, (void __user *)addr, 0,
                                current);
                break;
        default:
                force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *)addr, 0,
                                current);
                break;
        }
}

void sun4v_data_access_exception_tl1(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx)
{
        if (notify_die(DIE_TRAP_TL1, "data access exception tl1", regs,
                       0, 0x8, SIGTRAP) == NOTIFY_STOP)
                return;

        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        sun4v_data_access_exception(regs, addr, type_ctx);
}

#ifdef CONFIG_PCI
#include "pci_impl.h"
#endif

/* When access exceptions happen, we must do this. */
static void spitfire_clean_and_reenable_l1_caches(void)
{
        unsigned long va;

        if (tlb_type != spitfire)
                BUG();

        /* Clean 'em. */
        for (va =  0; va < (PAGE_SIZE << 1); va += 32) {
                spitfire_put_icache_tag(va, 0x0);
                spitfire_put_dcache_tag(va, 0x0);
        }

        /* Re-enable in LSU. */
        __asm__ __volatile__("flush %%g6\n\t"
                             "membar #Sync\n\t"
                             "stxa %0, [%%g0] %1\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "r" (LSU_CONTROL_IC | LSU_CONTROL_DC |
                                    LSU_CONTROL_IM | LSU_CONTROL_DM),
                             "i" (ASI_LSU_CONTROL)
                             : "memory");
}

static void spitfire_enable_estate_errors(void)
{
        __asm__ __volatile__("stxa      %0, [%%g0] %1\n\t"
                             "membar    #Sync"
                             : /* no outputs */
                             : "r" (ESTATE_ERR_ALL),
                               "i" (ASI_ESTATE_ERROR_EN));
}

static char ecc_syndrome_table[] = {
        0x4c, 0x40, 0x41, 0x48, 0x42, 0x48, 0x48, 0x49,
        0x43, 0x48, 0x48, 0x49, 0x48, 0x49, 0x49, 0x4a,
        0x44, 0x48, 0x48, 0x20, 0x48, 0x39, 0x4b, 0x48,
        0x48, 0x25, 0x31, 0x48, 0x28, 0x48, 0x48, 0x2c,
        0x45, 0x48, 0x48, 0x21, 0x48, 0x3d, 0x04, 0x48,
        0x48, 0x4b, 0x35, 0x48, 0x2d, 0x48, 0x48, 0x29,
        0x48, 0x00, 0x01, 0x48, 0x0a, 0x48, 0x48, 0x4b,
        0x0f, 0x48, 0x48, 0x4b, 0x48, 0x49, 0x49, 0x48,
        0x46, 0x48, 0x48, 0x2a, 0x48, 0x3b, 0x27, 0x48,
        0x48, 0x4b, 0x33, 0x48, 0x22, 0x48, 0x48, 0x2e,
        0x48, 0x19, 0x1d, 0x48, 0x1b, 0x4a, 0x48, 0x4b,
        0x1f, 0x48, 0x4a, 0x4b, 0x48, 0x4b, 0x4b, 0x48,
        0x48, 0x4b, 0x24, 0x48, 0x07, 0x48, 0x48, 0x36,
        0x4b, 0x48, 0x48, 0x3e, 0x48, 0x30, 0x38, 0x48,
        0x49, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x16, 0x48,
        0x48, 0x12, 0x4b, 0x48, 0x49, 0x48, 0x48, 0x4b,
        0x47, 0x48, 0x48, 0x2f, 0x48, 0x3f, 0x4b, 0x48,
        0x48, 0x06, 0x37, 0x48, 0x23, 0x48, 0x48, 0x2b,
        0x48, 0x05, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x32,
        0x26, 0x48, 0x48, 0x3a, 0x48, 0x34, 0x3c, 0x48,
        0x48, 0x11, 0x15, 0x48, 0x13, 0x4a, 0x48, 0x4b,
        0x17, 0x48, 0x4a, 0x4b, 0x48, 0x4b, 0x4b, 0x48,
        0x49, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x1e, 0x48,
        0x48, 0x1a, 0x4b, 0x48, 0x49, 0x48, 0x48, 0x4b,
        0x48, 0x08, 0x0d, 0x48, 0x02, 0x48, 0x48, 0x49,
        0x03, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x4b, 0x48,
        0x49, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x10, 0x48,
        0x48, 0x14, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x4b,
        0x49, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x18, 0x48,
        0x48, 0x1c, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x4b,
        0x4a, 0x0c, 0x09, 0x48, 0x0e, 0x48, 0x48, 0x4b,
        0x0b, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x4b, 0x4a
};

static char *syndrome_unknown = "<Unknown>";

static void spitfire_log_udb_syndrome(unsigned long afar, unsigned long udbh, unsigned long udbl, unsigned long bit)
{
        unsigned short scode;
        char memmod_str[64], *p;

        if (udbl & bit) {
                scode = ecc_syndrome_table[udbl & 0xff];
                if (sprintf_dimm(scode, afar, memmod_str, sizeof(memmod_str)) < 0)
                        p = syndrome_unknown;
                else
                        p = memmod_str;
                printk(KERN_WARNING "CPU[%d]: UDBL Syndrome[%x] "
                       "Memory Module \"%s\"\n",
                       smp_processor_id(), scode, p);
        }

        if (udbh & bit) {
                scode = ecc_syndrome_table[udbh & 0xff];
                if (sprintf_dimm(scode, afar, memmod_str, sizeof(memmod_str)) < 0)
                        p = syndrome_unknown;
                else
                        p = memmod_str;
                printk(KERN_WARNING "CPU[%d]: UDBH Syndrome[%x] "
                       "Memory Module \"%s\"\n",
                       smp_processor_id(), scode, p);
        }

}

static void spitfire_cee_log(unsigned long afsr, unsigned long afar, unsigned long udbh, unsigned long udbl, int tl1, struct pt_regs *regs)
{

        printk(KERN_WARNING "CPU[%d]: Correctable ECC Error "
               "AFSR[%lx] AFAR[%016lx] UDBL[%lx] UDBH[%lx] TL>1[%d]\n",
               smp_processor_id(), afsr, afar, udbl, udbh, tl1);

        spitfire_log_udb_syndrome(afar, udbh, udbl, UDBE_CE);

        /* We always log it, even if someone is listening for this
         * trap.
         */
        notify_die(DIE_TRAP, "Correctable ECC Error", regs,
                   0, TRAP_TYPE_CEE, SIGTRAP);

        /* The Correctable ECC Error trap does not disable I/D caches.  So
         * we only have to restore the ESTATE Error Enable register.
         */
        spitfire_enable_estate_errors();
}

static void spitfire_ue_log(unsigned long afsr, unsigned long afar, unsigned long udbh, unsigned long udbl, unsigned long tt, int tl1, struct pt_regs *regs)
{
        siginfo_t info;

        printk(KERN_WARNING "CPU[%d]: Uncorrectable Error AFSR[%lx] "
               "AFAR[%lx] UDBL[%lx] UDBH[%ld] TT[%lx] TL>1[%d]\n",
               smp_processor_id(), afsr, afar, udbl, udbh, tt, tl1);

        /* XXX add more human friendly logging of the error status
         * XXX as is implemented for cheetah
         */

        spitfire_log_udb_syndrome(afar, udbh, udbl, UDBE_UE);

        /* We always log it, even if someone is listening for this
         * trap.
         */
        notify_die(DIE_TRAP, "Uncorrectable Error", regs,
                   0, tt, SIGTRAP);

        if (regs->tstate & TSTATE_PRIV) {
                if (tl1)
                        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
                die_if_kernel("UE", regs);
        }

        /* XXX need more intelligent processing here, such as is implemented
         * XXX for cheetah errors, in fact if the E-cache still holds the
         * XXX line with bad parity this will loop
         */

        spitfire_clean_and_reenable_l1_caches();
        spitfire_enable_estate_errors();

        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        info.si_signo = SIGBUS;
        info.si_errno = 0;
        info.si_code = BUS_OBJERR;
        info.si_addr = (void *)0;
        info.si_trapno = 0;
        force_sig_info(SIGBUS, &info, current);
}

void spitfire_access_error(struct pt_regs *regs, unsigned long status_encoded, unsigned long afar)
{
        unsigned long afsr, tt, udbh, udbl;
        int tl1;

        afsr = (status_encoded & SFSTAT_AFSR_MASK) >> SFSTAT_AFSR_SHIFT;
        tt = (status_encoded & SFSTAT_TRAP_TYPE) >> SFSTAT_TRAP_TYPE_SHIFT;
        tl1 = (status_encoded & SFSTAT_TL_GT_ONE) ? 1 : 0;
        udbl = (status_encoded & SFSTAT_UDBL_MASK) >> SFSTAT_UDBL_SHIFT;
        udbh = (status_encoded & SFSTAT_UDBH_MASK) >> SFSTAT_UDBH_SHIFT;

#ifdef CONFIG_PCI
        if (tt == TRAP_TYPE_DAE &&
            pci_poke_in_progress && pci_poke_cpu == smp_processor_id()) {
                spitfire_clean_and_reenable_l1_caches();
                spitfire_enable_estate_errors();

                pci_poke_faulted = 1;
                regs->tnpc = regs->tpc + 4;
                return;
        }
#endif

        if (afsr & SFAFSR_UE)
                spitfire_ue_log(afsr, afar, udbh, udbl, tt, tl1, regs);

        if (tt == TRAP_TYPE_CEE) {
                /* Handle the case where we took a CEE trap, but ACK'd
                 * only the UE state in the UDB error registers.
                 */
                if (afsr & SFAFSR_UE) {
                        if (udbh & UDBE_CE) {
                                __asm__ __volatile__(
                                        "stxa   %0, [%1] %2\n\t"
                                        "membar #Sync"
                                        : /* no outputs */
                                        : "r" (udbh & UDBE_CE),
                                          "r" (0x0), "i" (ASI_UDB_ERROR_W));
                        }
                        if (udbl & UDBE_CE) {
                                __asm__ __volatile__(
                                        "stxa   %0, [%1] %2\n\t"
                                        "membar #Sync"
                                        : /* no outputs */
                                        : "r" (udbl & UDBE_CE),
                                          "r" (0x18), "i" (ASI_UDB_ERROR_W));
                        }
                }

                spitfire_cee_log(afsr, afar, udbh, udbl, tl1, regs);
        }
}

int cheetah_pcache_forced_on;

void cheetah_enable_pcache(void)
{
        unsigned long dcr;

        printk("CHEETAH: Enabling P-Cache on cpu %d.\n",
               smp_processor_id());

        __asm__ __volatile__("ldxa [%%g0] %1, %0"
                             : "=r" (dcr)
                             : "i" (ASI_DCU_CONTROL_REG));
        dcr |= (DCU_PE | DCU_HPE | DCU_SPE | DCU_SL);
        __asm__ __volatile__("stxa %0, [%%g0] %1\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "r" (dcr), "i" (ASI_DCU_CONTROL_REG));
}

/* Cheetah error trap handling. */
static unsigned long ecache_flush_physbase;
static unsigned long ecache_flush_linesize;
static unsigned long ecache_flush_size;

/* This table is ordered in priority of errors and matches the
 * AFAR overwrite policy as well.
 */

struct afsr_error_table {
        unsigned long mask;
        const char *name;
};

static const char CHAFSR_PERR_msg[] =
        "System interface protocol error";
static const char CHAFSR_IERR_msg[] =
        "Internal processor error";
static const char CHAFSR_ISAP_msg[] =
        "System request parity error on incoming address";
static const char CHAFSR_UCU_msg[] =
        "Uncorrectable E-cache ECC error for ifetch/data";
static const char CHAFSR_UCC_msg[] =
        "SW Correctable E-cache ECC error for ifetch/data";
static const char CHAFSR_UE_msg[] =
        "Uncorrectable system bus data ECC error for read";
static const char CHAFSR_EDU_msg[] =
        "Uncorrectable E-cache ECC error for stmerge/blkld";
static const char CHAFSR_EMU_msg[] =
        "Uncorrectable system bus MTAG error";
static const char CHAFSR_WDU_msg[] =
        "Uncorrectable E-cache ECC error for writeback";
static const char CHAFSR_CPU_msg[] =
        "Uncorrectable ECC error for copyout";
static const char CHAFSR_CE_msg[] =
        "HW corrected system bus data ECC error for read";
static const char CHAFSR_EDC_msg[] =
        "HW corrected E-cache ECC error for stmerge/blkld";
static const char CHAFSR_EMC_msg[] =
        "HW corrected system bus MTAG ECC error";
static const char CHAFSR_WDC_msg[] =
        "HW corrected E-cache ECC error for writeback";
static const char CHAFSR_CPC_msg[] =
        "HW corrected ECC error for copyout";
static const char CHAFSR_TO_msg[] =
        "Unmapped error from system bus";
static const char CHAFSR_BERR_msg[] =
        "Bus error response from system bus";
static const char CHAFSR_IVC_msg[] =
        "HW corrected system bus data ECC error for ivec read";
static const char CHAFSR_IVU_msg[] =
        "Uncorrectable system bus data ECC error for ivec read";
static struct afsr_error_table __cheetah_error_table[] = {
        {       CHAFSR_PERR,    CHAFSR_PERR_msg         },
        {       CHAFSR_IERR,    CHAFSR_IERR_msg         },
        {       CHAFSR_ISAP,    CHAFSR_ISAP_msg         },
        {       CHAFSR_UCU,     CHAFSR_UCU_msg          },
        {       CHAFSR_UCC,     CHAFSR_UCC_msg          },
        {       CHAFSR_UE,      CHAFSR_UE_msg           },
        {       CHAFSR_EDU,     CHAFSR_EDU_msg          },
        {       CHAFSR_EMU,     CHAFSR_EMU_msg          },
        {       CHAFSR_WDU,     CHAFSR_WDU_msg          },
        {       CHAFSR_CPU,     CHAFSR_CPU_msg          },
        {       CHAFSR_CE,      CHAFSR_CE_msg           },
        {       CHAFSR_EDC,     CHAFSR_EDC_msg          },
        {       CHAFSR_EMC,     CHAFSR_EMC_msg          },
        {       CHAFSR_WDC,     CHAFSR_WDC_msg          },
        {       CHAFSR_CPC,     CHAFSR_CPC_msg          },
        {       CHAFSR_TO,      CHAFSR_TO_msg           },
        {       CHAFSR_BERR,    CHAFSR_BERR_msg         },
        /* These two do not update the AFAR. */
        {       CHAFSR_IVC,     CHAFSR_IVC_msg          },
        {       CHAFSR_IVU,     CHAFSR_IVU_msg          },
        {       0,              NULL                    },
};
static const char CHPAFSR_DTO_msg[] =
        "System bus unmapped error for prefetch/storequeue-read";
static const char CHPAFSR_DBERR_msg[] =
        "System bus error for prefetch/storequeue-read";
static const char CHPAFSR_THCE_msg[] =
        "Hardware corrected E-cache Tag ECC error";
static const char CHPAFSR_TSCE_msg[] =
        "SW handled correctable E-cache Tag ECC error";
static const char CHPAFSR_TUE_msg[] =
        "Uncorrectable E-cache Tag ECC error";
static const char CHPAFSR_DUE_msg[] =
        "System bus uncorrectable data ECC error due to prefetch/store-fill";
static struct afsr_error_table __cheetah_plus_error_table[] = {
        {       CHAFSR_PERR,    CHAFSR_PERR_msg         },
        {       CHAFSR_IERR,    CHAFSR_IERR_msg         },
        {       CHAFSR_ISAP,    CHAFSR_ISAP_msg         },
        {       CHAFSR_UCU,     CHAFSR_UCU_msg          },
        {       CHAFSR_UCC,     CHAFSR_UCC_msg          },
        {       CHAFSR_UE,      CHAFSR_UE_msg           },
        {       CHAFSR_EDU,     CHAFSR_EDU_msg          },
        {       CHAFSR_EMU,     CHAFSR_EMU_msg          },
        {       CHAFSR_WDU,     CHAFSR_WDU_msg          },
        {       CHAFSR_CPU,     CHAFSR_CPU_msg          },
        {       CHAFSR_CE,      CHAFSR_CE_msg           },
        {       CHAFSR_EDC,     CHAFSR_EDC_msg          },
        {       CHAFSR_EMC,     CHAFSR_EMC_msg          },
        {       CHAFSR_WDC,     CHAFSR_WDC_msg          },
        {       CHAFSR_CPC,     CHAFSR_CPC_msg          },
        {       CHAFSR_TO,      CHAFSR_TO_msg           },
        {       CHAFSR_BERR,    CHAFSR_BERR_msg         },
        {       CHPAFSR_DTO,    CHPAFSR_DTO_msg         },
        {       CHPAFSR_DBERR,  CHPAFSR_DBERR_msg       },
        {       CHPAFSR_THCE,   CHPAFSR_THCE_msg        },
        {       CHPAFSR_TSCE,   CHPAFSR_TSCE_msg        },
        {       CHPAFSR_TUE,    CHPAFSR_TUE_msg         },
        {       CHPAFSR_DUE,    CHPAFSR_DUE_msg         },
        /* These two do not update the AFAR. */
        {       CHAFSR_IVC,     CHAFSR_IVC_msg          },
        {       CHAFSR_IVU,     CHAFSR_IVU_msg          },
        {       0,              NULL                    },
};
static const char JPAFSR_JETO_msg[] =
        "System interface protocol error, hw timeout caused";
static const char JPAFSR_SCE_msg[] =
        "Parity error on system snoop results";
static const char JPAFSR_JEIC_msg[] =
        "System interface protocol error, illegal command detected";
static const char JPAFSR_JEIT_msg[] =
        "System interface protocol error, illegal ADTYPE detected";
static const char JPAFSR_OM_msg[] =
        "Out of range memory error has occurred";
static const char JPAFSR_ETP_msg[] =
        "Parity error on L2 cache tag SRAM";
static const char JPAFSR_UMS_msg[] =
        "Error due to unsupported store";
static const char JPAFSR_RUE_msg[] =
        "Uncorrectable ECC error from remote cache/memory";
static const char JPAFSR_RCE_msg[] =
        "Correctable ECC error from remote cache/memory";
static const char JPAFSR_BP_msg[] =
        "JBUS parity error on returned read data";
static const char JPAFSR_WBP_msg[] =
        "JBUS parity error on data for writeback or block store";
static const char JPAFSR_FRC_msg[] =
        "Foreign read to DRAM incurring correctable ECC error";
static const char JPAFSR_FRU_msg[] =
        "Foreign read to DRAM incurring uncorrectable ECC error";
static struct afsr_error_table __jalapeno_error_table[] = {
        {       JPAFSR_JETO,    JPAFSR_JETO_msg         },
        {       JPAFSR_SCE,     JPAFSR_SCE_msg          },
        {       JPAFSR_JEIC,    JPAFSR_JEIC_msg         },
        {       JPAFSR_JEIT,    JPAFSR_JEIT_msg         },
        {       CHAFSR_PERR,    CHAFSR_PERR_msg         },
        {       CHAFSR_IERR,    CHAFSR_IERR_msg         },
        {       CHAFSR_ISAP,    CHAFSR_ISAP_msg         },
        {       CHAFSR_UCU,     CHAFSR_UCU_msg          },
        {       CHAFSR_UCC,     CHAFSR_UCC_msg          },
        {       CHAFSR_UE,      CHAFSR_UE_msg           },
        {       CHAFSR_EDU,     CHAFSR_EDU_msg          },
        {       JPAFSR_OM,      JPAFSR_OM_msg           },
        {       CHAFSR_WDU,     CHAFSR_WDU_msg          },
        {       CHAFSR_CPU,     CHAFSR_CPU_msg          },
        {       CHAFSR_CE,      CHAFSR_CE_msg           },
        {       CHAFSR_EDC,     CHAFSR_EDC_msg          },
        {       JPAFSR_ETP,     JPAFSR_ETP_msg          },
        {       CHAFSR_WDC,     CHAFSR_WDC_msg          },
        {       CHAFSR_CPC,     CHAFSR_CPC_msg          },
        {       CHAFSR_TO,      CHAFSR_TO_msg           },
        {       CHAFSR_BERR,    CHAFSR_BERR_msg         },
        {       JPAFSR_UMS,     JPAFSR_UMS_msg          },
        {       JPAFSR_RUE,     JPAFSR_RUE_msg          },
        {       JPAFSR_RCE,     JPAFSR_RCE_msg          },
        {       JPAFSR_BP,      JPAFSR_BP_msg           },
        {       JPAFSR_WBP,     JPAFSR_WBP_msg          },
        {       JPAFSR_FRC,     JPAFSR_FRC_msg          },
        {       JPAFSR_FRU,     JPAFSR_FRU_msg          },
        /* These two do not update the AFAR. */
        {       CHAFSR_IVU,     CHAFSR_IVU_msg          },
        {       0,              NULL                    },
};
static struct afsr_error_table *cheetah_error_table;
static unsigned long cheetah_afsr_errors;

struct cheetah_err_info *cheetah_error_log;

static inline struct cheetah_err_info *cheetah_get_error_log(unsigned long afsr)
{
        struct cheetah_err_info *p;
        int cpu = smp_processor_id();

        if (!cheetah_error_log)
                return NULL;

        p = cheetah_error_log + (cpu * 2);
        if ((afsr & CHAFSR_TL1) != 0UL)
                p++;

        return p;
}

extern unsigned int tl0_icpe[], tl1_icpe[];
extern unsigned int tl0_dcpe[], tl1_dcpe[];
extern unsigned int tl0_fecc[], tl1_fecc[];
extern unsigned int tl0_cee[], tl1_cee[];
extern unsigned int tl0_iae[], tl1_iae[];
extern unsigned int tl0_dae[], tl1_dae[];
extern unsigned int cheetah_plus_icpe_trap_vector[], cheetah_plus_icpe_trap_vector_tl1[];
extern unsigned int cheetah_plus_dcpe_trap_vector[], cheetah_plus_dcpe_trap_vector_tl1[];
extern unsigned int cheetah_fecc_trap_vector[], cheetah_fecc_trap_vector_tl1[];
extern unsigned int cheetah_cee_trap_vector[], cheetah_cee_trap_vector_tl1[];
extern unsigned int cheetah_deferred_trap_vector[], cheetah_deferred_trap_vector_tl1[];

void __init cheetah_ecache_flush_init(void)
{
        unsigned long largest_size, smallest_linesize, order, ver;
        int i, sz;

        /* Scan all cpu device tree nodes, note two values:
         * 1) largest E-cache size
         * 2) smallest E-cache line size
         */
        largest_size = 0UL;
        smallest_linesize = ~0UL;

        for (i = 0; i < NR_CPUS; i++) {
                unsigned long val;

                val = cpu_data(i).ecache_size;
                if (!val)
                        continue;

                if (val > largest_size)
                        largest_size = val;

                val = cpu_data(i).ecache_line_size;
                if (val < smallest_linesize)
                        smallest_linesize = val;

        }

        if (largest_size == 0UL || smallest_linesize == ~0UL) {
                prom_printf("cheetah_ecache_flush_init: Cannot probe cpu E-cache "
                            "parameters.\n");
                prom_halt();
        }

        ecache_flush_size = (2 * largest_size);
        ecache_flush_linesize = smallest_linesize;

        ecache_flush_physbase = find_ecache_flush_span(ecache_flush_size);

        if (ecache_flush_physbase == ~0UL) {
                prom_printf("cheetah_ecache_flush_init: Cannot find %ld byte "
                            "contiguous physical memory.\n",
                            ecache_flush_size);
                prom_halt();
        }

        /* Now allocate error trap reporting scoreboard. */
        sz = NR_CPUS * (2 * sizeof(struct cheetah_err_info));
        for (order = 0; order < MAX_ORDER; order++) {
                if ((PAGE_SIZE << order) >= sz)
                        break;
        }
        cheetah_error_log = (struct cheetah_err_info *)
                __get_free_pages(GFP_KERNEL, order);
        if (!cheetah_error_log) {
                prom_printf("cheetah_ecache_flush_init: Failed to allocate "
                            "error logging scoreboard (%d bytes).\n", sz);
                prom_halt();
        }
        memset(cheetah_error_log, 0, PAGE_SIZE << order);

        /* Mark all AFSRs as invalid so that the trap handler will
         * log new new information there.
         */
        for (i = 0; i < 2 * NR_CPUS; i++)
                cheetah_error_log[i].afsr = CHAFSR_INVALID;

        __asm__ ("rdpr %%ver, %0" : "=r" (ver));
        if ((ver >> 32) == __JALAPENO_ID ||
            (ver >> 32) == __SERRANO_ID) {
                cheetah_error_table = &__jalapeno_error_table[0];
                cheetah_afsr_errors = JPAFSR_ERRORS;
        } else if ((ver >> 32) == 0x003e0015) {
                cheetah_error_table = &__cheetah_plus_error_table[0];
                cheetah_afsr_errors = CHPAFSR_ERRORS;
        } else {
                cheetah_error_table = &__cheetah_error_table[0];
                cheetah_afsr_errors = CHAFSR_ERRORS;
        }

        /* Now patch trap tables. */
        memcpy(tl0_fecc, cheetah_fecc_trap_vector, (8 * 4));
        memcpy(tl1_fecc, cheetah_fecc_trap_vector_tl1, (8 * 4));
        memcpy(tl0_cee, cheetah_cee_trap_vector, (8 * 4));
        memcpy(tl1_cee, cheetah_cee_trap_vector_tl1, (8 * 4));
        memcpy(tl0_iae, cheetah_deferred_trap_vector, (8 * 4));
        memcpy(tl1_iae, cheetah_deferred_trap_vector_tl1, (8 * 4));
        memcpy(tl0_dae, cheetah_deferred_trap_vector, (8 * 4));
        memcpy(tl1_dae, cheetah_deferred_trap_vector_tl1, (8 * 4));
        if (tlb_type == cheetah_plus) {
                memcpy(tl0_dcpe, cheetah_plus_dcpe_trap_vector, (8 * 4));
                memcpy(tl1_dcpe, cheetah_plus_dcpe_trap_vector_tl1, (8 * 4));
                memcpy(tl0_icpe, cheetah_plus_icpe_trap_vector, (8 * 4));
                memcpy(tl1_icpe, cheetah_plus_icpe_trap_vector_tl1, (8 * 4));
        }
        flushi(PAGE_OFFSET);
}

static void cheetah_flush_ecache(void)
{
        unsigned long flush_base = ecache_flush_physbase;
        unsigned long flush_linesize = ecache_flush_linesize;
        unsigned long flush_size = ecache_flush_size;

        __asm__ __volatile__("1: subcc  %0, %4, %0\n\t"
                             "   bne,pt %%xcc, 1b\n\t"
                             "    ldxa  [%2 + %0] %3, %%g0\n\t"
                             : "=&r" (flush_size)
                             : "0" (flush_size), "r" (flush_base),
                               "i" (ASI_PHYS_USE_EC), "r" (flush_linesize));
}

static void cheetah_flush_ecache_line(unsigned long physaddr)
{
        unsigned long alias;

        physaddr &= ~(8UL - 1UL);
        physaddr = (ecache_flush_physbase +
                    (physaddr & ((ecache_flush_size>>1UL) - 1UL)));
        alias = physaddr + (ecache_flush_size >> 1UL);
        __asm__ __volatile__("ldxa [%0] %2, %%g0\n\t"
                             "ldxa [%1] %2, %%g0\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "r" (physaddr), "r" (alias),
                               "i" (ASI_PHYS_USE_EC));
}

/* Unfortunately, the diagnostic access to the I-cache tags we need to
 * use to clear the thing interferes with I-cache coherency transactions.
 *
 * So we must only flush the I-cache when it is disabled.
 */
static void __cheetah_flush_icache(void)
{
        unsigned int icache_size, icache_line_size;
        unsigned long addr;

        icache_size = local_cpu_data().icache_size;
        icache_line_size = local_cpu_data().icache_line_size;

        /* Clear the valid bits in all the tags. */
        for (addr = 0; addr < icache_size; addr += icache_line_size) {
                __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
                                     "membar #Sync"
                                     : /* no outputs */
                                     : "r" (addr | (2 << 3)),
                                       "i" (ASI_IC_TAG));
        }
}

static void cheetah_flush_icache(void)
{
        unsigned long dcu_save;

        /* Save current DCU, disable I-cache. */
        __asm__ __volatile__("ldxa [%%g0] %1, %0\n\t"
                             "or %0, %2, %%g1\n\t"
                             "stxa %%g1, [%%g0] %1\n\t"
                             "membar #Sync"
                             : "=r" (dcu_save)
                             : "i" (ASI_DCU_CONTROL_REG), "i" (DCU_IC)
                             : "g1");

        __cheetah_flush_icache();

        /* Restore DCU register */
        __asm__ __volatile__("stxa %0, [%%g0] %1\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "r" (dcu_save), "i" (ASI_DCU_CONTROL_REG));
}

static void cheetah_flush_dcache(void)
{
        unsigned int dcache_size, dcache_line_size;
        unsigned long addr;

        dcache_size = local_cpu_data().dcache_size;
        dcache_line_size = local_cpu_data().dcache_line_size;

        for (addr = 0; addr < dcache_size; addr += dcache_line_size) {
                __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
                                     "membar #Sync"
                                     : /* no outputs */
                                     : "r" (addr), "i" (ASI_DCACHE_TAG));
        }
}

/* In order to make the even parity correct we must do two things.
 * First, we clear DC_data_parity and set DC_utag to an appropriate value.
 * Next, we clear out all 32-bytes of data for that line.  Data of
 * all-zero + tag parity value of zero == correct parity.
 */
static void cheetah_plus_zap_dcache_parity(void)
{
        unsigned int dcache_size, dcache_line_size;
        unsigned long addr;

        dcache_size = local_cpu_data().dcache_size;
        dcache_line_size = local_cpu_data().dcache_line_size;

        for (addr = 0; addr < dcache_size; addr += dcache_line_size) {
                unsigned long tag = (addr >> 14);
                unsigned long line;

                __asm__ __volatile__("membar    #Sync\n\t"
                                     "stxa      %0, [%1] %2\n\t"
                                     "membar    #Sync"
                                     : /* no outputs */
                                     : "r" (tag), "r" (addr),
                                       "i" (ASI_DCACHE_UTAG));
                for (line = addr; line < addr + dcache_line_size; line += 8)
                        __asm__ __volatile__("membar    #Sync\n\t"
                                             "stxa      %%g0, [%0] %1\n\t"
                                             "membar    #Sync"
                                             : /* no outputs */
                                             : "r" (line),
                                               "i" (ASI_DCACHE_DATA));
        }
}

/* Conversion tables used to frob Cheetah AFSR syndrome values into
 * something palatable to the memory controller driver get_unumber
 * routine.
 */
#define MT0     137
#define MT1     138
#define MT2     139
#define NONE    254
#define MTC0    140
#define MTC1    141
#define MTC2    142
#define MTC3    143
#define C0      128
#define C1      129
#define C2      130
#define C3      131
#define C4      132
#define C5      133
#define C6      134
#define C7      135
#define C8      136
#define M2      144
#define M3      145
#define M4      146
#define M       147
static unsigned char cheetah_ecc_syntab[] = {
/*00*/NONE, C0, C1, M2, C2, M2, M3, 47, C3, M2, M2, 53, M2, 41, 29, M,
/*01*/C4, M, M, 50, M2, 38, 25, M2, M2, 33, 24, M2, 11, M, M2, 16,
/*02*/C5, M, M, 46, M2, 37, 19, M2, M, 31, 32, M, 7, M2, M2, 10,
/*03*/M2, 40, 13, M2, 59, M, M2, 66, M, M2, M2, 0, M2, 67, 71, M,
/*04*/C6, M, M, 43, M, 36, 18, M, M2, 49, 15, M, 63, M2, M2, 6,
/*05*/M2, 44, 28, M2, M, M2, M2, 52, 68, M2, M2, 62, M2, M3, M3, M4,
/*06*/M2, 26, 106, M2, 64, M, M2, 2, 120, M, M2, M3, M, M3, M3, M4,
/*07*/116, M2, M2, M3, M2, M3, M, M4, M2, 58, 54, M2, M, M4, M4, M3,
/*08*/C7, M2, M, 42, M, 35, 17, M2, M, 45, 14, M2, 21, M2, M2, 5,
/*09*/M, 27, M, M, 99, M, M, 3, 114, M2, M2, 20, M2, M3, M3, M,
/*0a*/M2, 23, 113, M2, 112, M2, M, 51, 95, M, M2, M3, M2, M3, M3, M2,
/*0b*/103, M, M2, M3, M2, M3, M3, M4, M2, 48, M, M, 73, M2, M, M3,
/*0c*/M2, 22, 110, M2, 109, M2, M, 9, 108, M2, M, M3, M2, M3, M3, M,
/*0d*/102, M2, M, M, M2, M3, M3, M, M2, M3, M3, M2, M, M4, M, M3,
/*0e*/98, M, M2, M3, M2, M, M3, M4, M2, M3, M3, M4, M3, M, M, M,
/*0f*/M2, M3, M3, M, M3, M, M, M, 56, M4, M, M3, M4, M, M, M,
/*10*/C8, M, M2, 39, M, 34, 105, M2, M, 30, 104, M, 101, M, M, 4,
/*11*/M, M, 100, M, 83, M, M2, 12, 87, M, M, 57, M2, M, M3, M,
/*12*/M2, 97, 82, M2, 78, M2, M2, 1, 96, M, M, M, M, M, M3, M2,
/*13*/94, M, M2, M3, M2, M, M3, M, M2, M, 79, M, 69, M, M4, M,
/*14*/M2, 93, 92, M, 91, M, M2, 8, 90, M2, M2, M, M, M, M, M4,
/*15*/89, M, M, M3, M2, M3, M3, M, M, M, M3, M2, M3, M2, M, M3,
/*16*/86, M, M2, M3, M2, M, M3, M, M2, M, M3, M, M3, M, M, M3,
/*17*/M, M, M3, M2, M3, M2, M4, M, 60, M, M2, M3, M4, M, M, M2,
/*18*/M2, 88, 85, M2, 84, M, M2, 55, 81, M2, M2, M3, M2, M3, M3, M4,
/*19*/77, M, M, M, M2, M3, M, M, M2, M3, M3, M4, M3, M2, M, M,
/*1a*/74, M, M2, M3, M, M, M3, M, M, M, M3, M, M3, M, M4, M3,
/*1b*/M2, 70, 107, M4, 65, M2, M2, M, 127, M, M, M, M2, M3, M3, M,
/*1c*/80, M2, M2, 72, M, 119, 118, M, M2, 126, 76, M, 125, M, M4, M3,
/*1d*/M2, 115, 124, M, 75, M, M, M3, 61, M, M4, M, M4, M, M, M,
/*1e*/M, 123, 122, M4, 121, M4, M, M3, 117, M2, M2, M3, M4, M3, M, M,
/*1f*/111, M, M, M, M4, M3, M3, M, M, M, M3, M, M3, M2, M, M
};
static unsigned char cheetah_mtag_syntab[] = {
       NONE, MTC0,
       MTC1, NONE,
       MTC2, NONE,
       NONE, MT0,
       MTC3, NONE,
       NONE, MT1,
       NONE, MT2,
       NONE, NONE
};

/* Return the highest priority error conditon mentioned. */
static inline unsigned long cheetah_get_hipri(unsigned long afsr)
{
        unsigned long tmp = 0;
        int i;

        for (i = 0; cheetah_error_table[i].mask; i++) {
                if ((tmp = (afsr & cheetah_error_table[i].mask)) != 0UL)
                        return tmp;
        }
        return tmp;
}

static const char *cheetah_get_string(unsigned long bit)
{
        int i;

        for (i = 0; cheetah_error_table[i].mask; i++) {
                if ((bit & cheetah_error_table[i].mask) != 0UL)
                        return cheetah_error_table[i].name;
        }
        return "???";
}

static void cheetah_log_errors(struct pt_regs *regs, struct cheetah_err_info *info,
                               unsigned long afsr, unsigned long afar, int recoverable)
{
        unsigned long hipri;
        char unum[256];

        printk("%s" "ERROR(%d): Cheetah error trap taken afsr[%016lx] afar[%016lx] TL1(%d)\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               afsr, afar,
               (afsr & CHAFSR_TL1) ? 1 : 0);
        printk("%s" "ERROR(%d): TPC[%lx] TNPC[%lx] O7[%lx] TSTATE[%lx]\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               regs->tpc, regs->tnpc, regs->u_regs[UREG_I7], regs->tstate);
        printk("%s" "ERROR(%d): ",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id());
        printk("TPC<%pS>\n", (void *) regs->tpc);
        printk("%s" "ERROR(%d): M_SYND(%lx),  E_SYND(%lx)%s%s\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               (afsr & CHAFSR_M_SYNDROME) >> CHAFSR_M_SYNDROME_SHIFT,
               (afsr & CHAFSR_E_SYNDROME) >> CHAFSR_E_SYNDROME_SHIFT,
               (afsr & CHAFSR_ME) ? ", Multiple Errors" : "",
               (afsr & CHAFSR_PRIV) ? ", Privileged" : "");
        hipri = cheetah_get_hipri(afsr);
        printk("%s" "ERROR(%d): Highest priority error (%016lx) \"%s\"\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               hipri, cheetah_get_string(hipri));

        /* Try to get unumber if relevant. */
#define ESYND_ERRORS    (CHAFSR_IVC | CHAFSR_IVU | \
                         CHAFSR_CPC | CHAFSR_CPU | \
                         CHAFSR_UE  | CHAFSR_CE  | \
                         CHAFSR_EDC | CHAFSR_EDU  | \
                         CHAFSR_UCC | CHAFSR_UCU  | \
                         CHAFSR_WDU | CHAFSR_WDC)
#define MSYND_ERRORS    (CHAFSR_EMC | CHAFSR_EMU)
        if (afsr & ESYND_ERRORS) {
                int syndrome;
                int ret;

                syndrome = (afsr & CHAFSR_E_SYNDROME) >> CHAFSR_E_SYNDROME_SHIFT;
                syndrome = cheetah_ecc_syntab[syndrome];
                ret = sprintf_dimm(syndrome, afar, unum, sizeof(unum));
                if (ret != -1)
                        printk("%s" "ERROR(%d): AFAR E-syndrome [%s]\n",
                               (recoverable ? KERN_WARNING : KERN_CRIT),
                               smp_processor_id(), unum);
        } else if (afsr & MSYND_ERRORS) {
                int syndrome;
                int ret;

                syndrome = (afsr & CHAFSR_M_SYNDROME) >> CHAFSR_M_SYNDROME_SHIFT;
                syndrome = cheetah_mtag_syntab[syndrome];
                ret = sprintf_dimm(syndrome, afar, unum, sizeof(unum));
                if (ret != -1)
                        printk("%s" "ERROR(%d): AFAR M-syndrome [%s]\n",
                               (recoverable ? KERN_WARNING : KERN_CRIT),
                               smp_processor_id(), unum);
        }

        /* Now dump the cache snapshots. */
        printk("%s" "ERROR(%d): D-cache idx[%x] tag[%016llx] utag[%016llx] stag[%016llx]\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               (int) info->dcache_index,
               info->dcache_tag,
               info->dcache_utag,
               info->dcache_stag);
        printk("%s" "ERROR(%d): D-cache data0[%016llx] data1[%016llx] data2[%016llx] data3[%016llx]\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               info->dcache_data[0],
               info->dcache_data[1],
               info->dcache_data[2],
               info->dcache_data[3]);
        printk("%s" "ERROR(%d): I-cache idx[%x] tag[%016llx] utag[%016llx] stag[%016llx] "
               "u[%016llx] l[%016llx]\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               (int) info->icache_index,
               info->icache_tag,
               info->icache_utag,
               info->icache_stag,
               info->icache_upper,
               info->icache_lower);
        printk("%s" "ERROR(%d): I-cache INSN0[%016llx] INSN1[%016llx] INSN2[%016llx] INSN3[%016llx]\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               info->icache_data[0],
               info->icache_data[1],
               info->icache_data[2],
               info->icache_data[3]);
        printk("%s" "ERROR(%d): I-cache INSN4[%016llx] INSN5[%016llx] INSN6[%016llx] INSN7[%016llx]\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               info->icache_data[4],
               info->icache_data[5],
               info->icache_data[6],
               info->icache_data[7]);
        printk("%s" "ERROR(%d): E-cache idx[%x] tag[%016llx]\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               (int) info->ecache_index, info->ecache_tag);
        printk("%s" "ERROR(%d): E-cache data0[%016llx] data1[%016llx] data2[%016llx] data3[%016llx]\n",
               (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
               info->ecache_data[0],
               info->ecache_data[1],
               info->ecache_data[2],
               info->ecache_data[3]);

        afsr = (afsr & ~hipri) & cheetah_afsr_errors;
        while (afsr != 0UL) {
                unsigned long bit = cheetah_get_hipri(afsr);

                printk("%s" "ERROR: Multiple-error (%016lx) \"%s\"\n",
                       (recoverable ? KERN_WARNING : KERN_CRIT),
                       bit, cheetah_get_string(bit));

                afsr &= ~bit;
        }

        if (!recoverable)
                printk(KERN_CRIT "ERROR: This condition is not recoverable.\n");
}

static int cheetah_recheck_errors(struct cheetah_err_info *logp)
{
        unsigned long afsr, afar;
        int ret = 0;

        __asm__ __volatile__("ldxa [%%g0] %1, %0\n\t"
                             : "=r" (afsr)
                             : "i" (ASI_AFSR));
        if ((afsr & cheetah_afsr_errors) != 0) {
                if (logp != NULL) {
                        __asm__ __volatile__("ldxa [%%g0] %1, %0\n\t"
                                             : "=r" (afar)
                                             : "i" (ASI_AFAR));
                        logp->afsr = afsr;
                        logp->afar = afar;
                }
                ret = 1;
        }
        __asm__ __volatile__("stxa %0, [%%g0] %1\n\t"
                             "membar #Sync\n\t"
                             : : "r" (afsr), "i" (ASI_AFSR));

        return ret;
}

void cheetah_fecc_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar)
{
        struct cheetah_err_info local_snapshot, *p;
        int recoverable;

        /* Flush E-cache */
        cheetah_flush_ecache();

        p = cheetah_get_error_log(afsr);
        if (!p) {
                prom_printf("ERROR: Early Fast-ECC error afsr[%016lx] afar[%016lx]\n",
                            afsr, afar);
                prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]\n",
                            smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate);
                prom_halt();
        }

        /* Grab snapshot of logged error. */
        memcpy(&local_snapshot, p, sizeof(local_snapshot));

        /* If the current trap snapshot does not match what the
         * trap handler passed along into our args, big trouble.
         * In such a case, mark the local copy as invalid.
         *
         * Else, it matches and we mark the afsr in the non-local
         * copy as invalid so we may log new error traps there.
         */
        if (p->afsr != afsr || p->afar != afar)
                local_snapshot.afsr = CHAFSR_INVALID;
        else
                p->afsr = CHAFSR_INVALID;

        cheetah_flush_icache();
        cheetah_flush_dcache();

        /* Re-enable I-cache/D-cache */
        __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                             "or %%g1, %1, %%g1\n\t"
                             "stxa %%g1, [%%g0] %0\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "i" (ASI_DCU_CONTROL_REG),
                               "i" (DCU_DC | DCU_IC)
                             : "g1");

        /* Re-enable error reporting */
        __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                             "or %%g1, %1, %%g1\n\t"
                             "stxa %%g1, [%%g0] %0\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "i" (ASI_ESTATE_ERROR_EN),
                               "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN)
                             : "g1");

        /* Decide if we can continue after handling this trap and
         * logging the error.
         */
        recoverable = 1;
        if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP))
                recoverable = 0;

        /* Re-check AFSR/AFAR.  What we are looking for here is whether a new
         * error was logged while we had error reporting traps disabled.
         */
        if (cheetah_recheck_errors(&local_snapshot)) {
                unsigned long new_afsr = local_snapshot.afsr;

                /* If we got a new asynchronous error, die... */
                if (new_afsr & (CHAFSR_EMU | CHAFSR_EDU |
                                CHAFSR_WDU | CHAFSR_CPU |
                                CHAFSR_IVU | CHAFSR_UE |
                                CHAFSR_BERR | CHAFSR_TO))
                        recoverable = 0;
        }

        /* Log errors. */
        cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable);

        if (!recoverable)
                panic("Irrecoverable Fast-ECC error trap.\n");

        /* Flush E-cache to kick the error trap handlers out. */
        cheetah_flush_ecache();
}

/* Try to fix a correctable error by pushing the line out from
 * the E-cache.  Recheck error reporting registers to see if the
 * problem is intermittent.
 */
static int cheetah_fix_ce(unsigned long physaddr)
{
        unsigned long orig_estate;
        unsigned long alias1, alias2;
        int ret;

        /* Make sure correctable error traps are disabled. */
        __asm__ __volatile__("ldxa      [%%g0] %2, %0\n\t"
                             "andn      %0, %1, %%g1\n\t"
                             "stxa      %%g1, [%%g0] %2\n\t"
                             "membar    #Sync"
                             : "=&r" (orig_estate)
                             : "i" (ESTATE_ERROR_CEEN),
                               "i" (ASI_ESTATE_ERROR_EN)
                             : "g1");

        /* We calculate alias addresses that will force the
         * cache line in question out of the E-cache.  Then
         * we bring it back in with an atomic instruction so
         * that we get it in some modified/exclusive state,
         * then we displace it again to try and get proper ECC
         * pushed back into the system.
         */
        physaddr &= ~(8UL - 1UL);
        alias1 = (ecache_flush_physbase +
                  (physaddr & ((ecache_flush_size >> 1) - 1)));
        alias2 = alias1 + (ecache_flush_size >> 1);
        __asm__ __volatile__("ldxa      [%0] %3, %%g0\n\t"
                             "ldxa      [%1] %3, %%g0\n\t"
                             "casxa     [%2] %3, %%g0, %%g0\n\t"
                             "ldxa      [%0] %3, %%g0\n\t"
                             "ldxa      [%1] %3, %%g0\n\t"
                             "membar    #Sync"
                             : /* no outputs */
                             : "r" (alias1), "r" (alias2),
                               "r" (physaddr), "i" (ASI_PHYS_USE_EC));

        /* Did that trigger another error? */
        if (cheetah_recheck_errors(NULL)) {
                /* Try one more time. */
                __asm__ __volatile__("ldxa [%0] %1, %%g0\n\t"
                                     "membar #Sync"
                                     : : "r" (physaddr), "i" (ASI_PHYS_USE_EC));
                if (cheetah_recheck_errors(NULL))
                        ret = 2;
                else
                        ret = 1;
        } else {
                /* No new error, intermittent problem. */
                ret = 0;
        }

        /* Restore error enables. */
        __asm__ __volatile__("stxa      %0, [%%g0] %1\n\t"
                             "membar    #Sync"
                             : : "r" (orig_estate), "i" (ASI_ESTATE_ERROR_EN));

        return ret;
}

/* Return non-zero if PADDR is a valid physical memory address. */
static int cheetah_check_main_memory(unsigned long paddr)
{
        unsigned long vaddr = PAGE_OFFSET + paddr;

        if (vaddr > (unsigned long) high_memory)
                return 0;

        return kern_addr_valid(vaddr);
}

void cheetah_cee_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar)
{
        struct cheetah_err_info local_snapshot, *p;
        int recoverable, is_memory;

        p = cheetah_get_error_log(afsr);
        if (!p) {
                prom_printf("ERROR: Early CEE error afsr[%016lx] afar[%016lx]\n",
                            afsr, afar);
                prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]\n",
                            smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate);
                prom_halt();
        }

        /* Grab snapshot of logged error. */
        memcpy(&local_snapshot, p, sizeof(local_snapshot));

        /* If the current trap snapshot does not match what the
         * trap handler passed along into our args, big trouble.
         * In such a case, mark the local copy as invalid.
         *
         * Else, it matches and we mark the afsr in the non-local
         * copy as invalid so we may log new error traps there.
         */
        if (p->afsr != afsr || p->afar != afar)
                local_snapshot.afsr = CHAFSR_INVALID;
        else
                p->afsr = CHAFSR_INVALID;

        is_memory = cheetah_check_main_memory(afar);

        if (is_memory && (afsr & CHAFSR_CE) != 0UL) {
                /* XXX Might want to log the results of this operation
                 * XXX somewhere... -DaveM
                 */
                cheetah_fix_ce(afar);
        }

        {
                int flush_all, flush_line;

                flush_all = flush_line = 0;
                if ((afsr & CHAFSR_EDC) != 0UL) {
                        if ((afsr & cheetah_afsr_errors) == CHAFSR_EDC)
                                flush_line = 1;
                        else
                                flush_all = 1;
                } else if ((afsr & CHAFSR_CPC) != 0UL) {
                        if ((afsr & cheetah_afsr_errors) == CHAFSR_CPC)
                                flush_line = 1;
                        else
                                flush_all = 1;
                }

                /* Trap handler only disabled I-cache, flush it. */
                cheetah_flush_icache();

                /* Re-enable I-cache */
                __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                                     "or %%g1, %1, %%g1\n\t"
                                     "stxa %%g1, [%%g0] %0\n\t"
                                     "membar #Sync"
                                     : /* no outputs */
                                     : "i" (ASI_DCU_CONTROL_REG),
                                     "i" (DCU_IC)
                                     : "g1");

                if (flush_all)
                        cheetah_flush_ecache();
                else if (flush_line)
                        cheetah_flush_ecache_line(afar);
        }

        /* Re-enable error reporting */
        __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                             "or %%g1, %1, %%g1\n\t"
                             "stxa %%g1, [%%g0] %0\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "i" (ASI_ESTATE_ERROR_EN),
                               "i" (ESTATE_ERROR_CEEN)
                             : "g1");

        /* Decide if we can continue after handling this trap and
         * logging the error.
         */
        recoverable = 1;
        if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP))
                recoverable = 0;

        /* Re-check AFSR/AFAR */
        (void) cheetah_recheck_errors(&local_snapshot);

        /* Log errors. */
        cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable);

        if (!recoverable)
                panic("Irrecoverable Correctable-ECC error trap.\n");
}

void cheetah_deferred_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar)
{
        struct cheetah_err_info local_snapshot, *p;
        int recoverable, is_memory;

#ifdef CONFIG_PCI
        /* Check for the special PCI poke sequence. */
        if (pci_poke_in_progress && pci_poke_cpu == smp_processor_id()) {
                cheetah_flush_icache();
                cheetah_flush_dcache();

                /* Re-enable I-cache/D-cache */
                __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                                     "or %%g1, %1, %%g1\n\t"
                                     "stxa %%g1, [%%g0] %0\n\t"
                                     "membar #Sync"
                                     : /* no outputs */
                                     : "i" (ASI_DCU_CONTROL_REG),
                                       "i" (DCU_DC | DCU_IC)
                                     : "g1");

                /* Re-enable error reporting */
                __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                                     "or %%g1, %1, %%g1\n\t"
                                     "stxa %%g1, [%%g0] %0\n\t"
                                     "membar #Sync"
                                     : /* no outputs */
                                     : "i" (ASI_ESTATE_ERROR_EN),
                                       "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN)
                                     : "g1");

                (void) cheetah_recheck_errors(NULL);

                pci_poke_faulted = 1;
                regs->tpc += 4;
                regs->tnpc = regs->tpc + 4;
                return;
        }
#endif

        p = cheetah_get_error_log(afsr);
        if (!p) {
                prom_printf("ERROR: Early deferred error afsr[%016lx] afar[%016lx]\n",
                            afsr, afar);
                prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]\n",
                            smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate);
                prom_halt();
        }

        /* Grab snapshot of logged error. */
        memcpy(&local_snapshot, p, sizeof(local_snapshot));

        /* If the current trap snapshot does not match what the
         * trap handler passed along into our args, big trouble.
         * In such a case, mark the local copy as invalid.
         *
         * Else, it matches and we mark the afsr in the non-local
         * copy as invalid so we may log new error traps there.
         */
        if (p->afsr != afsr || p->afar != afar)
                local_snapshot.afsr = CHAFSR_INVALID;
        else
                p->afsr = CHAFSR_INVALID;

        is_memory = cheetah_check_main_memory(afar);

        {
                int flush_all, flush_line;

                flush_all = flush_line = 0;
                if ((afsr & CHAFSR_EDU) != 0UL) {
                        if ((afsr & cheetah_afsr_errors) == CHAFSR_EDU)
                                flush_line = 1;
                        else
                                flush_all = 1;
                } else if ((afsr & CHAFSR_BERR) != 0UL) {
                        if ((afsr & cheetah_afsr_errors) == CHAFSR_BERR)
                                flush_line = 1;
                        else
                                flush_all = 1;
                }

                cheetah_flush_icache();
                cheetah_flush_dcache();

                /* Re-enable I/D caches */
                __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                                     "or %%g1, %1, %%g1\n\t"
                                     "stxa %%g1, [%%g0] %0\n\t"
                                     "membar #Sync"
                                     : /* no outputs */
                                     : "i" (ASI_DCU_CONTROL_REG),
                                     "i" (DCU_IC | DCU_DC)
                                     : "g1");

                if (flush_all)
                        cheetah_flush_ecache();
                else if (flush_line)
                        cheetah_flush_ecache_line(afar);
        }

        /* Re-enable error reporting */
        __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                             "or %%g1, %1, %%g1\n\t"
                             "stxa %%g1, [%%g0] %0\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "i" (ASI_ESTATE_ERROR_EN),
                             "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN)
                             : "g1");

        /* Decide if we can continue after handling this trap and
         * logging the error.
         */
        recoverable = 1;
        if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP))
                recoverable = 0;

        /* Re-check AFSR/AFAR.  What we are looking for here is whether a new
         * error was logged while we had error reporting traps disabled.
         */
        if (cheetah_recheck_errors(&local_snapshot)) {
                unsigned long new_afsr = local_snapshot.afsr;

                /* If we got a new asynchronous error, die... */
                if (new_afsr & (CHAFSR_EMU | CHAFSR_EDU |
                                CHAFSR_WDU | CHAFSR_CPU |
                                CHAFSR_IVU | CHAFSR_UE |
                                CHAFSR_BERR | CHAFSR_TO))
                        recoverable = 0;
        }

        /* Log errors. */
        cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable);

        /* "Recoverable" here means we try to yank the page from ever
         * being newly used again.  This depends upon a few things:
         * 1) Must be main memory, and AFAR must be valid.
         * 2) If we trapped from user, OK.
         * 3) Else, if we trapped from kernel we must find exception
         *    table entry (ie. we have to have been accessing user
         *    space).
         *
         * If AFAR is not in main memory, or we trapped from kernel
         * and cannot find an exception table entry, it is unacceptable
         * to try and continue.
         */
        if (recoverable && is_memory) {
                if ((regs->tstate & TSTATE_PRIV) == 0UL) {
                        /* OK, usermode access. */
                        recoverable = 1;
                } else {
                        const struct exception_table_entry *entry;

                        entry = search_exception_tables(regs->tpc);
                        if (entry) {
                                /* OK, kernel access to userspace. */
                                recoverable = 1;

                        } else {
                                /* BAD, privileged state is corrupted. */
                                recoverable = 0;
                        }

                        if (recoverable) {
                                if (pfn_valid(afar >> PAGE_SHIFT))
                                        get_page(pfn_to_page(afar >> PAGE_SHIFT));
                                else
                                        recoverable = 0;

                                /* Only perform fixup if we still have a
                                 * recoverable condition.
                                 */
                                if (recoverable) {
                                        regs->tpc = entry->fixup;
                                        regs->tnpc = regs->tpc + 4;
                                }
                        }
                }
        } else {
                recoverable = 0;
        }

        if (!recoverable)
                panic("Irrecoverable deferred error trap.\n");
}

/* Handle a D/I cache parity error trap.  TYPE is encoded as:
 *
 * Bit0:        0=dcache,1=icache
 * Bit1:        0=recoverable,1=unrecoverable
 *
 * The hardware has disabled both the I-cache and D-cache in
 * the %dcr register.  
 */
void cheetah_plus_parity_error(int type, struct pt_regs *regs)
{
        if (type & 0x1)
                __cheetah_flush_icache();
        else
                cheetah_plus_zap_dcache_parity();
        cheetah_flush_dcache();

        /* Re-enable I-cache/D-cache */
        __asm__ __volatile__("ldxa [%%g0] %0, %%g1\n\t"
                             "or %%g1, %1, %%g1\n\t"
                             "stxa %%g1, [%%g0] %0\n\t"
                             "membar #Sync"
                             : /* no outputs */
                             : "i" (ASI_DCU_CONTROL_REG),
                               "i" (DCU_DC | DCU_IC)
                             : "g1");

        if (type & 0x2) {
                printk(KERN_EMERG "CPU[%d]: Cheetah+ %c-cache parity error at TPC[%016lx]\n",
                       smp_processor_id(),
                       (type & 0x1) ? 'I' : 'D',
                       regs->tpc);
                printk(KERN_EMERG "TPC<%pS>\n", (void *) regs->tpc);
                panic("Irrecoverable Cheetah+ parity error.");
        }

        printk(KERN_WARNING "CPU[%d]: Cheetah+ %c-cache parity error at TPC[%016lx]\n",
               smp_processor_id(),
               (type & 0x1) ? 'I' : 'D',
               regs->tpc);
        printk(KERN_WARNING "TPC<%pS>\n", (void *) regs->tpc);
}

struct sun4v_error_entry {
        /* Unique error handle */
/*0x00*/u64             err_handle;

        /* %stick value at the time of the error */
/*0x08*/u64             err_stick;

/*0x10*/u8              reserved_1[3];

        /* Error type */
/*0x13*/u8              err_type;
#define SUN4V_ERR_TYPE_UNDEFINED        0
#define SUN4V_ERR_TYPE_UNCORRECTED_RES  1
#define SUN4V_ERR_TYPE_PRECISE_NONRES   2
#define SUN4V_ERR_TYPE_DEFERRED_NONRES  3
#define SUN4V_ERR_TYPE_SHUTDOWN_RQST    4
#define SUN4V_ERR_TYPE_DUMP_CORE        5
#define SUN4V_ERR_TYPE_SP_STATE_CHANGE  6
#define SUN4V_ERR_TYPE_NUM              7

        /* Error attributes */
/*0x14*/u32             err_attrs;
#define SUN4V_ERR_ATTRS_PROCESSOR       0x00000001
#define SUN4V_ERR_ATTRS_MEMORY          0x00000002
#define SUN4V_ERR_ATTRS_PIO             0x00000004
#define SUN4V_ERR_ATTRS_INT_REGISTERS   0x00000008
#define SUN4V_ERR_ATTRS_FPU_REGISTERS   0x00000010
#define SUN4V_ERR_ATTRS_SHUTDOWN_RQST   0x00000020
#define SUN4V_ERR_ATTRS_ASR             0x00000040
#define SUN4V_ERR_ATTRS_ASI             0x00000080
#define SUN4V_ERR_ATTRS_PRIV_REG        0x00000100
#define SUN4V_ERR_ATTRS_SPSTATE_MSK     0x00000600
#define SUN4V_ERR_ATTRS_MCD             0x00000800
#define SUN4V_ERR_ATTRS_SPSTATE_SHFT    9
#define SUN4V_ERR_ATTRS_MODE_MSK        0x03000000
#define SUN4V_ERR_ATTRS_MODE_SHFT       24
#define SUN4V_ERR_ATTRS_RES_QUEUE_FULL  0x80000000

#define SUN4V_ERR_SPSTATE_FAULTED       0
#define SUN4V_ERR_SPSTATE_AVAILABLE     1
#define SUN4V_ERR_SPSTATE_NOT_PRESENT   2

#define SUN4V_ERR_MODE_USER             1
#define SUN4V_ERR_MODE_PRIV             2

        /* Real address of the memory region or PIO transaction */
/*0x18*/u64             err_raddr;

        /* Size of the operation triggering the error, in bytes */
/*0x20*/u32             err_size;

        /* ID of the CPU */
/*0x24*/u16             err_cpu;

        /* Grace periof for shutdown, in seconds */
/*0x26*/u16             err_secs;

        /* Value of the %asi register */
/*0x28*/u8              err_asi;

/*0x29*/u8              reserved_2;

        /* Value of the ASR register number */
/*0x2a*/u16             err_asr;
#define SUN4V_ERR_ASR_VALID             0x8000

/*0x2c*/u32             reserved_3;
/*0x30*/u64             reserved_4;
/*0x38*/u64             reserved_5;
};

static atomic_t sun4v_resum_oflow_cnt = ATOMIC_INIT(0);
static atomic_t sun4v_nonresum_oflow_cnt = ATOMIC_INIT(0);

static const char *sun4v_err_type_to_str(u8 type)
{
        static const char *types[SUN4V_ERR_TYPE_NUM] = {
                "undefined",
                "uncorrected resumable",
                "precise nonresumable",
                "deferred nonresumable",
                "shutdown request",
                "dump core",
                "SP state change",
        };

        if (type < SUN4V_ERR_TYPE_NUM)
                return types[type];

        return "unknown";
}

static void sun4v_emit_err_attr_strings(u32 attrs)
{
        static const char *attr_names[] = {
                "processor",
                "memory",
                "PIO",
                "int-registers",
                "fpu-registers",
                "shutdown-request",
                "ASR",
                "ASI",
                "priv-reg",
        };
        static const char *sp_states[] = {
                "sp-faulted",
                "sp-available",
                "sp-not-present",
                "sp-state-reserved",
        };
        static const char *modes[] = {
                "mode-reserved0",
                "user",
                "priv",
                "mode-reserved1",
        };
        u32 sp_state, mode;
        int i;

        for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
                if (attrs & (1U << i)) {
                        const char *s = attr_names[i];

                        pr_cont("%s ", s);
                }
        }

        sp_state = ((attrs & SUN4V_ERR_ATTRS_SPSTATE_MSK) >>
                    SUN4V_ERR_ATTRS_SPSTATE_SHFT);
        pr_cont("%s ", sp_states[sp_state]);

        mode = ((attrs & SUN4V_ERR_ATTRS_MODE_MSK) >>
                SUN4V_ERR_ATTRS_MODE_SHFT);
        pr_cont("%s ", modes[mode]);

        if (attrs & SUN4V_ERR_ATTRS_RES_QUEUE_FULL)
                pr_cont("res-queue-full ");
}

/* When the report contains a real-address of "-1" it means that the
 * hardware did not provide the address.  So we compute the effective
 * address of the load or store instruction at regs->tpc and report
 * that.  Usually when this happens it's a PIO and in such a case we
 * are using physical addresses with bypass ASIs anyways, so what we
 * report here is exactly what we want.
 */
static void sun4v_report_real_raddr(const char *pfx, struct pt_regs *regs)
{
        unsigned int insn;
        u64 addr;

        if (!(regs->tstate & TSTATE_PRIV))
                return;

        insn = *(unsigned int *) regs->tpc;

        addr = compute_effective_address(regs, insn, 0);

        printk("%s: insn effective address [0x%016llx]\n",
               pfx, addr);
}

static void sun4v_log_error(struct pt_regs *regs, struct sun4v_error_entry *ent,
                            int cpu, const char *pfx, atomic_t *ocnt)
{
        u64 *raw_ptr = (u64 *) ent;

        u32 attrs;
        int cnt;

        printk("%s: Reporting on cpu %d\n", pfx, cpu);
        printk("%s: TPC [0x%016lx] <%pS>\n",
               pfx, regs->tpc, (void *) regs->tpc);

        printk("%s: RAW [%016llx:%016llx:%016llx:%016llx\n",
               pfx, raw_ptr[0], raw_ptr[1], raw_ptr[2], raw_ptr[3]);
        printk("%s:      %016llx:%016llx:%016llx:%016llx]\n",
               pfx, raw_ptr[4], raw_ptr[5], raw_ptr[6], raw_ptr[7]);

        printk("%s: handle [0x%016llx] stick [0x%016llx]\n",
               pfx, ent->err_handle, ent->err_stick);

        printk("%s: type [%s]\n", pfx, sun4v_err_type_to_str(ent->err_type));

        attrs = ent->err_attrs;
        printk("%s: attrs [0x%08x] < ", pfx, attrs);
        sun4v_emit_err_attr_strings(attrs);
        pr_cont(">\n");

        /* Various fields in the error report are only valid if
         * certain attribute bits are set.
         */
        if (attrs & (SUN4V_ERR_ATTRS_MEMORY |
                     SUN4V_ERR_ATTRS_PIO |
                     SUN4V_ERR_ATTRS_ASI)) {
                printk("%s: raddr [0x%016llx]\n", pfx, ent->err_raddr);

                if (ent->err_raddr == ~(u64)0)
                        sun4v_report_real_raddr(pfx, regs);
        }

        if (attrs & (SUN4V_ERR_ATTRS_MEMORY | SUN4V_ERR_ATTRS_ASI))
                printk("%s: size [0x%x]\n", pfx, ent->err_size);

        if (attrs & (SUN4V_ERR_ATTRS_PROCESSOR |
                     SUN4V_ERR_ATTRS_INT_REGISTERS |
                     SUN4V_ERR_ATTRS_FPU_REGISTERS |
                     SUN4V_ERR_ATTRS_PRIV_REG))
                printk("%s: cpu[%u]\n", pfx, ent->err_cpu);

        if (attrs & SUN4V_ERR_ATTRS_ASI)
                printk("%s: asi [0x%02x]\n", pfx, ent->err_asi);

        if ((attrs & (SUN4V_ERR_ATTRS_INT_REGISTERS |
                      SUN4V_ERR_ATTRS_FPU_REGISTERS |
                      SUN4V_ERR_ATTRS_PRIV_REG)) &&
            (ent->err_asr & SUN4V_ERR_ASR_VALID) != 0)
                printk("%s: reg [0x%04x]\n",
                       pfx, ent->err_asr & ~SUN4V_ERR_ASR_VALID);

        show_regs(regs);

        if ((cnt = atomic_read(ocnt)) != 0) {
                atomic_set(ocnt, 0);
                wmb();
                printk("%s: Queue overflowed %d times.\n",
                       pfx, cnt);
        }
}

/* Handle memory corruption detected error which is vectored in
 * through resumable error trap.
 */
void do_mcd_err(struct pt_regs *regs, struct sun4v_error_entry ent)
{
        if (notify_die(DIE_TRAP, "MCD error", regs, 0, 0x34,
                       SIGSEGV) == NOTIFY_STOP)
                return;

        if (regs->tstate & TSTATE_PRIV) {
                /* MCD exception could happen because the task was
                 * running a system call with MCD enabled and passed a
                 * non-versioned pointer or pointer with bad version
                 * tag to the system call. In such cases, hypervisor
                 * places the address of offending instruction in the
                 * resumable error report. This is a deferred error,
                 * so the read/write that caused the trap was potentially
                 * retired long time back and we may have no choice
                 * but to send SIGSEGV to the process.
                 */
                const struct exception_table_entry *entry;

                entry = search_exception_tables(regs->tpc);
                if (entry) {
                        /* Looks like a bad syscall parameter */
#ifdef DEBUG_EXCEPTIONS
                        pr_emerg("Exception: PC<%016lx> faddr<UNKNOWN>\n",
                                 regs->tpc);
                        pr_emerg("EX_TABLE: insn<%016lx> fixup<%016lx>\n",
                                 ent.err_raddr, entry->fixup);
#endif
                        regs->tpc = entry->fixup;
                        regs->tnpc = regs->tpc + 4;
                        return;
                }
        }

        /* Send SIGSEGV to the userspace process with the right signal
         * code
         */
        force_sig_fault(SIGSEGV, SEGV_ADIDERR, (void __user *)ent.err_raddr,
                        0, current);
}

/* We run with %pil set to PIL_NORMAL_MAX and PSTATE_IE enabled in %pstate.
 * Log the event and clear the first word of the entry.
 */
void sun4v_resum_error(struct pt_regs *regs, unsigned long offset)
{
        enum ctx_state prev_state = exception_enter();
        struct sun4v_error_entry *ent, local_copy;
        struct trap_per_cpu *tb;
        unsigned long paddr;
        int cpu;

        cpu = get_cpu();

        tb = &trap_block[cpu];
        paddr = tb->resum_kernel_buf_pa + offset;
        ent = __va(paddr);

        memcpy(&local_copy, ent, sizeof(struct sun4v_error_entry));

        /* We have a local copy now, so release the entry.  */
        ent->err_handle = 0;
        wmb();

        put_cpu();

        if (local_copy.err_type == SUN4V_ERR_TYPE_SHUTDOWN_RQST) {
                /* We should really take the seconds field of
                 * the error report and use it for the shutdown
                 * invocation, but for now do the same thing we
                 * do for a DS shutdown request.
                 */
                pr_info("Shutdown request, %u seconds...\n",
                        local_copy.err_secs);
                orderly_poweroff(true);
                goto out;
        }

        /* If this is a memory corruption detected error vectored in
         * by HV through resumable error trap, call the handler
         */
        if (local_copy.err_attrs & SUN4V_ERR_ATTRS_MCD) {
                do_mcd_err(regs, local_copy);
                return;
        }

        sun4v_log_error(regs, &local_copy, cpu,
                        KERN_ERR "RESUMABLE ERROR",
                        &sun4v_resum_oflow_cnt);
out:
        exception_exit(prev_state);
}

/* If we try to printk() we'll probably make matters worse, by trying
 * to retake locks this cpu already holds or causing more errors. So
 * just bump a counter, and we'll report these counter bumps above.
 */
void sun4v_resum_overflow(struct pt_regs *regs)
{
        atomic_inc(&sun4v_resum_oflow_cnt);
}

/* Given a set of registers, get the virtual addressi that was being accessed
 * by the faulting instructions at tpc.
 */
static unsigned long sun4v_get_vaddr(struct pt_regs *regs)
{
        unsigned int insn;

        if (!copy_from_user(&insn, (void __user *)regs->tpc, 4)) {
                return compute_effective_address(regs, insn,
                                                 (insn >> 25) & 0x1f);
        }
        return 0;
}

/* Attempt to handle non-resumable errors generated from userspace.
 * Returns true if the signal was handled, false otherwise.
 */
bool sun4v_nonresum_error_user_handled(struct pt_regs *regs,
                                  struct sun4v_error_entry *ent) {

        unsigned int attrs = ent->err_attrs;

        if (attrs & SUN4V_ERR_ATTRS_MEMORY) {
                unsigned long addr = ent->err_raddr;
                siginfo_t info;

                if (addr == ~(u64)0) {
                        /* This seems highly unlikely to ever occur */
                        pr_emerg("SUN4V NON-RECOVERABLE ERROR: Memory error detected in unknown location!\n");
                } else {
                        unsigned long page_cnt = DIV_ROUND_UP(ent->err_size,
                                                              PAGE_SIZE);

                        /* Break the unfortunate news. */
                        pr_emerg("SUN4V NON-RECOVERABLE ERROR: Memory failed at %016lX\n",
                                 addr);
                        pr_emerg("SUN4V NON-RECOVERABLE ERROR:   Claiming %lu ages.\n",
                                 page_cnt);

                        while (page_cnt-- > 0) {
                                if (pfn_valid(addr >> PAGE_SHIFT))
                                        get_page(pfn_to_page(addr >> PAGE_SHIFT));
                                addr += PAGE_SIZE;
                        }
                }
                info.si_signo = SIGKILL;
                info.si_errno = 0;
                info.si_trapno = 0;
                force_sig_info(info.si_signo, &info, current);

                return true;
        }
        if (attrs & SUN4V_ERR_ATTRS_PIO) {
                siginfo_t info;

                info.si_signo = SIGBUS;
                info.si_code = BUS_ADRERR;
                info.si_addr = (void __user *)sun4v_get_vaddr(regs);
                force_sig_info(info.si_signo, &info, current);

                return true;
        }

        /* Default to doing nothing */
        return false;
}

/* We run with %pil set to PIL_NORMAL_MAX and PSTATE_IE enabled in %pstate.
 * Log the event, clear the first word of the entry, and die.
 */
void sun4v_nonresum_error(struct pt_regs *regs, unsigned long offset)
{
        struct sun4v_error_entry *ent, local_copy;
        struct trap_per_cpu *tb;
        unsigned long paddr;
        int cpu;

        cpu = get_cpu();

        tb = &trap_block[cpu];
        paddr = tb->nonresum_kernel_buf_pa + offset;
        ent = __va(paddr);

        memcpy(&local_copy, ent, sizeof(struct sun4v_error_entry));

        /* We have a local copy now, so release the entry.  */
        ent->err_handle = 0;
        wmb();

        put_cpu();

        if (!(regs->tstate & TSTATE_PRIV) &&
            sun4v_nonresum_error_user_handled(regs, &local_copy)) {
                /* DON'T PANIC: This userspace error was handled. */
                return;
        }

#ifdef CONFIG_PCI
        /* Check for the special PCI poke sequence. */
        if (pci_poke_in_progress && pci_poke_cpu == cpu) {
                pci_poke_faulted = 1;
                regs->tpc += 4;
                regs->tnpc = regs->tpc + 4;
                return;
        }
#endif

        sun4v_log_error(regs, &local_copy, cpu,
                        KERN_EMERG "NON-RESUMABLE ERROR",
                        &sun4v_nonresum_oflow_cnt);

        panic("Non-resumable error.");
}

/* If we try to printk() we'll probably make matters worse, by trying
 * to retake locks this cpu already holds or causing more errors. So
 * just bump a counter, and we'll report these counter bumps above.
 */
void sun4v_nonresum_overflow(struct pt_regs *regs)
{
        /* XXX Actually even this can make not that much sense.  Perhaps
         * XXX we should just pull the plug and panic directly from here?
         */
        atomic_inc(&sun4v_nonresum_oflow_cnt);
}

static void sun4v_tlb_error(struct pt_regs *regs)
{
        die_if_kernel("TLB/TSB error", regs);
}

unsigned long sun4v_err_itlb_vaddr;
unsigned long sun4v_err_itlb_ctx;
unsigned long sun4v_err_itlb_pte;
unsigned long sun4v_err_itlb_error;

void sun4v_itlb_error_report(struct pt_regs *regs, int tl)
{
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));

        printk(KERN_EMERG "SUN4V-ITLB: Error at TPC[%lx], tl %d\n",
               regs->tpc, tl);
        printk(KERN_EMERG "SUN4V-ITLB: TPC<%pS>\n", (void *) regs->tpc);
        printk(KERN_EMERG "SUN4V-ITLB: O7[%lx]\n", regs->u_regs[UREG_I7]);
        printk(KERN_EMERG "SUN4V-ITLB: O7<%pS>\n",
               (void *) regs->u_regs[UREG_I7]);
        printk(KERN_EMERG "SUN4V-ITLB: vaddr[%lx] ctx[%lx] "
               "pte[%lx] error[%lx]\n",
               sun4v_err_itlb_vaddr, sun4v_err_itlb_ctx,
               sun4v_err_itlb_pte, sun4v_err_itlb_error);

        sun4v_tlb_error(regs);
}

unsigned long sun4v_err_dtlb_vaddr;
unsigned long sun4v_err_dtlb_ctx;
unsigned long sun4v_err_dtlb_pte;
unsigned long sun4v_err_dtlb_error;

void sun4v_dtlb_error_report(struct pt_regs *regs, int tl)
{
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));

        printk(KERN_EMERG "SUN4V-DTLB: Error at TPC[%lx], tl %d\n",
               regs->tpc, tl);
        printk(KERN_EMERG "SUN4V-DTLB: TPC<%pS>\n", (void *) regs->tpc);
        printk(KERN_EMERG "SUN4V-DTLB: O7[%lx]\n", regs->u_regs[UREG_I7]);
        printk(KERN_EMERG "SUN4V-DTLB: O7<%pS>\n",
               (void *) regs->u_regs[UREG_I7]);
        printk(KERN_EMERG "SUN4V-DTLB: vaddr[%lx] ctx[%lx] "
               "pte[%lx] error[%lx]\n",
               sun4v_err_dtlb_vaddr, sun4v_err_dtlb_ctx,
               sun4v_err_dtlb_pte, sun4v_err_dtlb_error);

        sun4v_tlb_error(regs);
}

void hypervisor_tlbop_error(unsigned long err, unsigned long op)
{
        printk(KERN_CRIT "SUN4V: TLB hv call error %lu for op %lu\n",
               err, op);
}

void hypervisor_tlbop_error_xcall(unsigned long err, unsigned long op)
{
        printk(KERN_CRIT "SUN4V: XCALL TLB hv call error %lu for op %lu\n",
               err, op);
}

static void do_fpe_common(struct pt_regs *regs)
{
        if (regs->tstate & TSTATE_PRIV) {
                regs->tpc = regs->tnpc;
                regs->tnpc += 4;
        } else {
                unsigned long fsr = current_thread_info()->xfsr[0];
                siginfo_t info;

                if (test_thread_flag(TIF_32BIT)) {
                        regs->tpc &= 0xffffffff;
                        regs->tnpc &= 0xffffffff;
                }
                info.si_signo = SIGFPE;
                info.si_errno = 0;
                info.si_addr = (void __user *)regs->tpc;
                info.si_trapno = 0;
                info.si_code = FPE_FIXME;
                if ((fsr & 0x1c000) == (1 << 14)) {
                        if (fsr & 0x10)
                                info.si_code = FPE_FLTINV;
                        else if (fsr & 0x08)
                                info.si_code = FPE_FLTOVF;
                        else if (fsr & 0x04)
                                info.si_code = FPE_FLTUND;
                        else if (fsr & 0x02)
                                info.si_code = FPE_FLTDIV;
                        else if (fsr & 0x01)
                                info.si_code = FPE_FLTRES;
                }
                force_sig_info(SIGFPE, &info, current);
        }
}

void do_fpieee(struct pt_regs *regs)
{
        enum ctx_state prev_state = exception_enter();

        if (notify_die(DIE_TRAP, "fpu exception ieee", regs,
                       0, 0x24, SIGFPE) == NOTIFY_STOP)
                goto out;

        do_fpe_common(regs);
out:
        exception_exit(prev_state);
}

void do_fpother(struct pt_regs *regs)
{
        enum ctx_state prev_state = exception_enter();
        struct fpustate *f = FPUSTATE;
        int ret = 0;

        if (notify_die(DIE_TRAP, "fpu exception other", regs,
                       0, 0x25, SIGFPE) == NOTIFY_STOP)
                goto out;

        switch ((current_thread_info()->xfsr[0] & 0x1c000)) {
        case (2 << 14): /* unfinished_FPop */
        case (3 << 14): /* unimplemented_FPop */
                ret = do_mathemu(regs, f, false);
                break;
        }
        if (ret)
                goto out;
        do_fpe_common(regs);
out:
        exception_exit(prev_state);
}

void do_tof(struct pt_regs *regs)
{
        enum ctx_state prev_state = exception_enter();
        siginfo_t info;

        if (notify_die(DIE_TRAP, "tagged arithmetic overflow", regs,
                       0, 0x26, SIGEMT) == NOTIFY_STOP)
                goto out;

        if (regs->tstate & TSTATE_PRIV)
                die_if_kernel("Penguin overflow trap from kernel mode", regs);
        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        info.si_signo = SIGEMT;
        info.si_errno = 0;
        info.si_code = EMT_TAGOVF;
        info.si_addr = (void __user *)regs->tpc;
        info.si_trapno = 0;
        force_sig_info(SIGEMT, &info, current);
out:
        exception_exit(prev_state);
}

void do_div0(struct pt_regs *regs)
{
        enum ctx_state prev_state = exception_enter();
        siginfo_t info;

        if (notify_die(DIE_TRAP, "integer division by zero", regs,
                       0, 0x28, SIGFPE) == NOTIFY_STOP)
                goto out;

        if (regs->tstate & TSTATE_PRIV)
                die_if_kernel("TL0: Kernel divide by zero.", regs);
        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        info.si_signo = SIGFPE;
        info.si_errno = 0;
        info.si_code = FPE_INTDIV;
        info.si_addr = (void __user *)regs->tpc;
        info.si_trapno = 0;
        force_sig_info(SIGFPE, &info, current);
out:
        exception_exit(prev_state);
}

static void instruction_dump(unsigned int *pc)
{
        int i;

        if ((((unsigned long) pc) & 3))
                return;

        printk("Instruction DUMP:");
        for (i = -3; i < 6; i++)
                printk("%c%08x%c",i?' ':'<',pc[i],i?' ':'>');
        printk("\n");
}

static void user_instruction_dump(unsigned int __user *pc)
{
        int i;
        unsigned int buf[9];
        
        if ((((unsigned long) pc) & 3))
                return;
                
        if (copy_from_user(buf, pc - 3, sizeof(buf)))
                return;

        printk("Instruction DUMP:");
        for (i = 0; i < 9; i++)
                printk("%c%08x%c",i==3?' ':'<',buf[i],i==3?' ':'>');
        printk("\n");
}

void show_stack(struct task_struct *tsk, unsigned long *_ksp)
{
        unsigned long fp, ksp;
        struct thread_info *tp;
        int count = 0;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
        int graph = 0;
#endif

        ksp = (unsigned long) _ksp;
        if (!tsk)
                tsk = current;
        tp = task_thread_info(tsk);
        if (ksp == 0UL) {
                if (tsk == current)
                        asm("mov %%fp, %0" : "=r" (ksp));
                else
                        ksp = tp->ksp;
        }
        if (tp == current_thread_info())
                flushw_all();

        fp = ksp + STACK_BIAS;

        printk("Call Trace:\n");
        do {
                struct sparc_stackf *sf;
                struct pt_regs *regs;
                unsigned long pc;

                if (!kstack_valid(tp, fp))
                        break;
                sf = (struct sparc_stackf *) fp;
                regs = (struct pt_regs *) (sf + 1);

                if (kstack_is_trap_frame(tp, regs)) {
                        if (!(regs->tstate & TSTATE_PRIV))
                                break;
                        pc = regs->tpc;
                        fp = regs->u_regs[UREG_I6] + STACK_BIAS;
                } else {
                        pc = sf->callers_pc;
                        fp = (unsigned long)sf->fp + STACK_BIAS;
                }

                printk(" [%016lx] %pS\n", pc, (void *) pc);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
                if ((pc + 8UL) == (unsigned long) &return_to_handler) {
                        int index = tsk->curr_ret_stack;
                        if (tsk->ret_stack && index >= graph) {
                                pc = tsk->ret_stack[index - graph].ret;
                                printk(" [%016lx] %pS\n", pc, (void *) pc);
                                graph++;
                        }
                }
#endif
        } while (++count < 16);
}

static inline struct reg_window *kernel_stack_up(struct reg_window *rw)
{
        unsigned long fp = rw->ins[6];

        if (!fp)
                return NULL;

        return (struct reg_window *) (fp + STACK_BIAS);
}

void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
{
        static int die_counter;
        int count = 0;
        
        /* Amuse the user. */
        printk(
"              \\|/ ____ \\|/\n"
"              \"@'/ .. \\`@\"\n"
"              /_| \\__/ |_\\\n"
"                 \\__U_/\n");

        printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
        notify_die(DIE_OOPS, str, regs, 0, 255, SIGSEGV);
        __asm__ __volatile__("flushw");
        show_regs(regs);
        add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
        if (regs->tstate & TSTATE_PRIV) {
                struct thread_info *tp = current_thread_info();
                struct reg_window *rw = (struct reg_window *)
                        (regs->u_regs[UREG_FP] + STACK_BIAS);

                /* Stop the back trace when we hit userland or we
                 * find some badly aligned kernel stack.
                 */
                while (rw &&
                       count++ < 30 &&
                       kstack_valid(tp, (unsigned long) rw)) {
                        printk("Caller[%016lx]: %pS\n", rw->ins[7],
                               (void *) rw->ins[7]);

                        rw = kernel_stack_up(rw);
                }
                instruction_dump ((unsigned int *) regs->tpc);
        } else {
                if (test_thread_flag(TIF_32BIT)) {
                        regs->tpc &= 0xffffffff;
                        regs->tnpc &= 0xffffffff;
                }
                user_instruction_dump ((unsigned int __user *) regs->tpc);
        }
        if (panic_on_oops)
                panic("Fatal exception");
        if (regs->tstate & TSTATE_PRIV)
                do_exit(SIGKILL);
        do_exit(SIGSEGV);
}
EXPORT_SYMBOL(die_if_kernel);

#define VIS_OPCODE_MASK ((0x3 << 30) | (0x3f << 19))
#define VIS_OPCODE_VAL  ((0x2 << 30) | (0x36 << 19))

void do_illegal_instruction(struct pt_regs *regs)
{
        enum ctx_state prev_state = exception_enter();
        unsigned long pc = regs->tpc;
        unsigned long tstate = regs->tstate;
        u32 insn;
        siginfo_t info;

        if (notify_die(DIE_TRAP, "illegal instruction", regs,
                       0, 0x10, SIGILL) == NOTIFY_STOP)
                goto out;

        if (tstate & TSTATE_PRIV)
                die_if_kernel("Kernel illegal instruction", regs);
        if (test_thread_flag(TIF_32BIT))
                pc = (u32)pc;
        if (get_user(insn, (u32 __user *) pc) != -EFAULT) {
                if ((insn & 0xc1ffc000) == 0x81700000) /* POPC */ {
                        if (handle_popc(insn, regs))
                                goto out;
                } else if ((insn & 0xc1580000) == 0xc1100000) /* LDQ/STQ */ {
                        if (handle_ldf_stq(insn, regs))
                                goto out;
                } else if (tlb_type == hypervisor) {
                        if ((insn & VIS_OPCODE_MASK) == VIS_OPCODE_VAL) {
                                if (!vis_emul(regs, insn))
                                        goto out;
                        } else {
                                struct fpustate *f = FPUSTATE;

                                /* On UltraSPARC T2 and later, FPU insns which
                                 * are not implemented in HW signal an illegal
                                 * instruction trap and do not set the FP Trap
                                 * Trap in the %fsr to unimplemented_FPop.
                                 */
                                if (do_mathemu(regs, f, true))
                                        goto out;
                        }
                }
        }
        info.si_signo = SIGILL;
        info.si_errno = 0;
        info.si_code = ILL_ILLOPC;
        info.si_addr = (void __user *)pc;
        info.si_trapno = 0;
        force_sig_info(SIGILL, &info, current);
out:
        exception_exit(prev_state);
}

void mem_address_unaligned(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
{
        enum ctx_state prev_state = exception_enter();
        siginfo_t info;

        if (notify_die(DIE_TRAP, "memory address unaligned", regs,
                       0, 0x34, SIGSEGV) == NOTIFY_STOP)
                goto out;

        if (regs->tstate & TSTATE_PRIV) {
                kernel_unaligned_trap(regs, *((unsigned int *)regs->tpc));
                goto out;
        }
        if (is_no_fault_exception(regs))
                return;

        info.si_signo = SIGBUS;
        info.si_errno = 0;
        info.si_code = BUS_ADRALN;
        info.si_addr = (void __user *)sfar;
        info.si_trapno = 0;
        force_sig_info(SIGBUS, &info, current);
out:
        exception_exit(prev_state);
}

void sun4v_do_mna(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx)
{
        siginfo_t info;

        if (notify_die(DIE_TRAP, "memory address unaligned", regs,
                       0, 0x34, SIGSEGV) == NOTIFY_STOP)
                return;

        if (regs->tstate & TSTATE_PRIV) {
                kernel_unaligned_trap(regs, *((unsigned int *)regs->tpc));
                return;
        }
        if (is_no_fault_exception(regs))
                return;

        info.si_signo = SIGBUS;
        info.si_errno = 0;
        info.si_code = BUS_ADRALN;
        info.si_addr = (void __user *) addr;
        info.si_trapno = 0;
        force_sig_info(SIGBUS, &info, current);
}

/* sun4v_mem_corrupt_detect_precise() - Handle precise exception on an ADI
 * tag mismatch.
 *
 * ADI version tag mismatch on a load from memory always results in a
 * precise exception. Tag mismatch on a store to memory will result in
 * precise exception if MCDPER or PMCDPER is set to 1.
 */
void sun4v_mem_corrupt_detect_precise(struct pt_regs *regs, unsigned long addr,
                                      unsigned long context)
{
        if (notify_die(DIE_TRAP, "memory corruption precise exception", regs,
                       0, 0x8, SIGSEGV) == NOTIFY_STOP)
                return;

        if (regs->tstate & TSTATE_PRIV) {
                /* MCD exception could happen because the task was running
                 * a system call with MCD enabled and passed a non-versioned
                 * pointer or pointer with bad version tag to  the system
                 * call.
                 */
                const struct exception_table_entry *entry;

                entry = search_exception_tables(regs->tpc);
                if (entry) {
                        /* Looks like a bad syscall parameter */
#ifdef DEBUG_EXCEPTIONS
                        pr_emerg("Exception: PC<%016lx> faddr<UNKNOWN>\n",
                                 regs->tpc);
                        pr_emerg("EX_TABLE: insn<%016lx> fixup<%016lx>\n",
                                 regs->tpc, entry->fixup);
#endif
                        regs->tpc = entry->fixup;
                        regs->tnpc = regs->tpc + 4;
                        return;
                }
                pr_emerg("%s: ADDR[%016lx] CTX[%lx], going.\n",
                         __func__, addr, context);
                die_if_kernel("MCD precise", regs);
        }

        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        force_sig_fault(SIGSEGV, SEGV_ADIPERR, (void __user *)addr, 0, current);
}

void do_privop(struct pt_regs *regs)
{
        enum ctx_state prev_state = exception_enter();
        siginfo_t info;

        if (notify_die(DIE_TRAP, "privileged operation", regs,
                       0, 0x11, SIGILL) == NOTIFY_STOP)
                goto out;

        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
        info.si_signo = SIGILL;
        info.si_errno = 0;
        info.si_code = ILL_PRVOPC;
        info.si_addr = (void __user *)regs->tpc;
        info.si_trapno = 0;
        force_sig_info(SIGILL, &info, current);
out:
        exception_exit(prev_state);
}

void do_privact(struct pt_regs *regs)
{
        do_privop(regs);
}

/* Trap level 1 stuff or other traps we should never see... */
void do_cee(struct pt_regs *regs)
{
        exception_enter();
        die_if_kernel("TL0: Cache Error Exception", regs);
}

void do_div0_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: DIV0 Exception", regs);
}

void do_fpieee_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: FPU IEEE Exception", regs);
}

void do_fpother_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: FPU Other Exception", regs);
}

void do_ill_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: Illegal Instruction Exception", regs);
}

void do_irq_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: IRQ Exception", regs);
}

void do_lddfmna_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: LDDF Exception", regs);
}

void do_stdfmna_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: STDF Exception", regs);
}

void do_paw(struct pt_regs *regs)
{
        exception_enter();
        die_if_kernel("TL0: Phys Watchpoint Exception", regs);
}

void do_paw_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: Phys Watchpoint Exception", regs);
}

void do_vaw(struct pt_regs *regs)
{
        exception_enter();
        die_if_kernel("TL0: Virt Watchpoint Exception", regs);
}

void do_vaw_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: Virt Watchpoint Exception", regs);
}

void do_tof_tl1(struct pt_regs *regs)
{
        exception_enter();
        dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
        die_if_kernel("TL1: Tag Overflow Exception", regs);
}

void do_getpsr(struct pt_regs *regs)
{
        regs->u_regs[UREG_I0] = tstate_to_psr(regs->tstate);
        regs->tpc   = regs->tnpc;
        regs->tnpc += 4;
        if (test_thread_flag(TIF_32BIT)) {
                regs->tpc &= 0xffffffff;
                regs->tnpc &= 0xffffffff;
        }
}

u64 cpu_mondo_counter[NR_CPUS] = {0};
struct trap_per_cpu trap_block[NR_CPUS];
EXPORT_SYMBOL(trap_block);

/* This can get invoked before sched_init() so play it super safe
 * and use hard_smp_processor_id().
 */
void notrace init_cur_cpu_trap(struct thread_info *t)
{
        int cpu = hard_smp_processor_id();
        struct trap_per_cpu *p = &trap_block[cpu];

        p->thread = t;
        p->pgd_paddr = 0;
}

extern void thread_info_offsets_are_bolixed_dave(void);
extern void trap_per_cpu_offsets_are_bolixed_dave(void);
extern void tsb_config_offsets_are_bolixed_dave(void);

/* Only invoked on boot processor. */
void __init trap_init(void)
{
        /* Compile time sanity check. */
        BUILD_BUG_ON(TI_TASK != offsetof(struct thread_info, task) ||
                     TI_FLAGS != offsetof(struct thread_info, flags) ||
                     TI_CPU != offsetof(struct thread_info, cpu) ||
                     TI_FPSAVED != offsetof(struct thread_info, fpsaved) ||
                     TI_KSP != offsetof(struct thread_info, ksp) ||
                     TI_FAULT_ADDR != offsetof(struct thread_info,
                                               fault_address) ||
                     TI_KREGS != offsetof(struct thread_info, kregs) ||
                     TI_UTRAPS != offsetof(struct thread_info, utraps) ||
                     TI_REG_WINDOW != offsetof(struct thread_info,
                                               reg_window) ||
                     TI_RWIN_SPTRS != offsetof(struct thread_info,
                                               rwbuf_stkptrs) ||
                     TI_GSR != offsetof(struct thread_info, gsr) ||
                     TI_XFSR != offsetof(struct thread_info, xfsr) ||
                     TI_PRE_COUNT != offsetof(struct thread_info,
                                              preempt_count) ||
                     TI_NEW_CHILD != offsetof(struct thread_info, new_child) ||
                     TI_CURRENT_DS != offsetof(struct thread_info,
                                                current_ds) ||
                     TI_KUNA_REGS != offsetof(struct thread_info,
                                              kern_una_regs) ||
                     TI_KUNA_INSN != offsetof(struct thread_info,
                                              kern_una_insn) ||
                     TI_FPREGS != offsetof(struct thread_info, fpregs) ||
                     (TI_FPREGS & (64 - 1)));

        BUILD_BUG_ON(TRAP_PER_CPU_THREAD != offsetof(struct trap_per_cpu,
                                                     thread) ||
                     (TRAP_PER_CPU_PGD_PADDR !=
                      offsetof(struct trap_per_cpu, pgd_paddr)) ||
                     (TRAP_PER_CPU_CPU_MONDO_PA !=
                      offsetof(struct trap_per_cpu, cpu_mondo_pa)) ||
                     (TRAP_PER_CPU_DEV_MONDO_PA !=
                      offsetof(struct trap_per_cpu, dev_mondo_pa)) ||
                     (TRAP_PER_CPU_RESUM_MONDO_PA !=
                      offsetof(struct trap_per_cpu, resum_mondo_pa)) ||
                     (TRAP_PER_CPU_RESUM_KBUF_PA !=
                      offsetof(struct trap_per_cpu, resum_kernel_buf_pa)) ||
                     (TRAP_PER_CPU_NONRESUM_MONDO_PA !=
                      offsetof(struct trap_per_cpu, nonresum_mondo_pa)) ||
                     (TRAP_PER_CPU_NONRESUM_KBUF_PA !=
                      offsetof(struct trap_per_cpu, nonresum_kernel_buf_pa)) ||
                     (TRAP_PER_CPU_FAULT_INFO !=
                      offsetof(struct trap_per_cpu, fault_info)) ||
                     (TRAP_PER_CPU_CPU_MONDO_BLOCK_PA !=
                      offsetof(struct trap_per_cpu, cpu_mondo_block_pa)) ||
                     (TRAP_PER_CPU_CPU_LIST_PA !=
                      offsetof(struct trap_per_cpu, cpu_list_pa)) ||
                     (TRAP_PER_CPU_TSB_HUGE !=
                      offsetof(struct trap_per_cpu, tsb_huge)) ||
                     (TRAP_PER_CPU_TSB_HUGE_TEMP !=
                      offsetof(struct trap_per_cpu, tsb_huge_temp)) ||
                     (TRAP_PER_CPU_IRQ_WORKLIST_PA !=
                      offsetof(struct trap_per_cpu, irq_worklist_pa)) ||
                     (TRAP_PER_CPU_CPU_MONDO_QMASK !=
                      offsetof(struct trap_per_cpu, cpu_mondo_qmask)) ||
                     (TRAP_PER_CPU_DEV_MONDO_QMASK !=
                      offsetof(struct trap_per_cpu, dev_mondo_qmask)) ||
                     (TRAP_PER_CPU_RESUM_QMASK !=
                      offsetof(struct trap_per_cpu, resum_qmask)) ||
                     (TRAP_PER_CPU_NONRESUM_QMASK !=
                      offsetof(struct trap_per_cpu, nonresum_qmask)) ||
                     (TRAP_PER_CPU_PER_CPU_BASE !=
                      offsetof(struct trap_per_cpu, __per_cpu_base)));

        BUILD_BUG_ON((TSB_CONFIG_TSB !=
                      offsetof(struct tsb_config, tsb)) ||
                     (TSB_CONFIG_RSS_LIMIT !=
                      offsetof(struct tsb_config, tsb_rss_limit)) ||
                     (TSB_CONFIG_NENTRIES !=
                      offsetof(struct tsb_config, tsb_nentries)) ||
                     (TSB_CONFIG_REG_VAL !=
                      offsetof(struct tsb_config, tsb_reg_val)) ||