#ifndef __SPARC64_SYSTEM_H
#define __SPARC64_SYSTEM_H

#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/visasm.h>

#ifndef __ASSEMBLY__

#include <linux/irqflags.h>

/*
 * Sparc (general) CPU types
 */
enum sparc_cpu {
  sun4        = 0x00,
  sun4c       = 0x01,
  sun4m       = 0x02,
  sun4d       = 0x03,
  sun4e       = 0x04,
  sun4u       = 0x05, /* V8 ploos ploos */
  sun_unknown = 0x06,
  ap1000      = 0x07, /* almost a sun4m */
};
                  
#define sparc_cpu_model sun4u

/* This cannot ever be a sun4c nor sun4 :) That's just history. */
#define ARCH_SUN4C_SUN4 0
#define ARCH_SUN4 0

/* These are here in an effort to more fully work around Spitfire Errata
 * #51.  Essentially, if a memory barrier occurs soon after a mispredicted
 * branch, the chip can stop executing instructions until a trap occurs.
 * Therefore, if interrupts are disabled, the chip can hang forever.
 *
 * It used to be believed that the memory barrier had to be right in the
 * delay slot, but a case has been traced recently wherein the memory barrier
 * was one instruction after the branch delay slot and the chip still hung.
 * The offending sequence was the following in sym_wakeup_done() of the
 * sym53c8xx_2 driver:
 *
 *      call    sym_ccb_from_dsa, 0
 *       movge  %icc, 0, %l0
 *      brz,pn  %o0, .LL1303
 *       mov    %o0, %l2
 *      membar  #LoadLoad
 *
 * The branch has to be mispredicted for the bug to occur.  Therefore, we put
 * the memory barrier explicitly into a "branch always, predicted taken"
 * delay slot to avoid the problem case.
 */
#define membar_safe(type) \
do {    __asm__ __volatile__("ba,pt     %%xcc, 1f\n\t" \
                             " membar   " type "\n" \
                             "1:\n" \
                             : : : "memory"); \
} while (0)

#define mb()    \
        membar_safe("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
#define rmb()   \
        membar_safe("#LoadLoad")
#define wmb()   \
        membar_safe("#StoreStore")
#define membar_storeload() \
        membar_safe("#StoreLoad")
#define membar_storeload_storestore() \
        membar_safe("#StoreLoad | #StoreStore")
#define membar_storeload_loadload() \
        membar_safe("#StoreLoad | #LoadLoad")
#define membar_storestore_loadstore() \
        membar_safe("#StoreStore | #LoadStore")

#endif

#define nop()           __asm__ __volatile__ ("nop")

#define read_barrier_depends()          do { } while(0)
#define set_mb(__var, __value) \
        do { __var = __value; membar_storeload_storestore(); } while(0)

#ifdef CONFIG_SMP
#define smp_mb()        mb()
#define smp_rmb()       rmb()
#define smp_wmb()       wmb()
#define smp_read_barrier_depends()      read_barrier_depends()
#else
#define smp_mb()        __asm__ __volatile__("":::"memory")
#define smp_rmb()       __asm__ __volatile__("":::"memory")
#define smp_wmb()       __asm__ __volatile__("":::"memory")
#define smp_read_barrier_depends()      do { } while(0)
#endif

#define flushi(addr)    __asm__ __volatile__ ("flush %0" : : "r" (addr) : "memory")

#define flushw_all()    __asm__ __volatile__("flushw")

/* Performance counter register access. */
#define read_pcr(__p)  __asm__ __volatile__("rd %%pcr, %0" : "=r" (__p))
#define write_pcr(__p) __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (__p))
#define read_pic(__p)  __asm__ __volatile__("rd %%pic, %0" : "=r" (__p))

/* Blackbird errata workaround.  See commentary in
 * arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
 * for more information.
 */
#define reset_pic()                                             \
        __asm__ __volatile__("ba,pt     %xcc, 99f\n\t"          \
                             ".align    64\n"                   \
                          "99:wr        %g0, 0x0, %pic\n\t"     \
                             "rd        %pic, %g0")

#ifndef __ASSEMBLY__

extern void sun_do_break(void);
extern int stop_a_enabled;

extern void synchronize_user_stack(void);

extern void __flushw_user(void);
#define flushw_user() __flushw_user()

#define flush_user_windows flushw_user
#define flush_register_windows flushw_all

/* Don't hold the runqueue lock over context switch */
#define __ARCH_WANT_UNLOCKED_CTXSW
#define prepare_arch_switch(next)               \
do {                                            \
        flushw_all();                           \
} while (0)

        /* See what happens when you design the chip correctly?
         *
         * We tell gcc we clobber all non-fixed-usage registers except
         * for l0/l1.  It will use one for 'next' and the other to hold
         * the output value of 'last'.  'next' is not referenced again
         * past the invocation of switch_to in the scheduler, so we need
         * not preserve it's value.  Hairy, but it lets us remove 2 loads
         * and 2 stores in this critical code path.  -DaveM
         */
#define switch_to(prev, next, last)                                     \
do {    if (test_thread_flag(TIF_PERFCTR)) {                            \
                unsigned long __tmp;                                    \
                read_pcr(__tmp);                                        \
                current_thread_info()->pcr_reg = __tmp;                 \
                read_pic(__tmp);                                        \
                current_thread_info()->kernel_cntd0 += (unsigned int)(__tmp);\
                current_thread_info()->kernel_cntd1 += ((__tmp) >> 32); \
        }                                                               \
        flush_tlb_pending();                                            \
        save_and_clear_fpu();                                           \
        /* If you are tempted to conditionalize the following */        \
        /* so that ASI is only written if it changes, think again. */   \
        __asm__ __volatile__("wr %%g0, %0, %%asi"                       \
        : : "r" (__thread_flag_byte_ptr(task_thread_info(next))[TI_FLAG_BYTE_CURRENT_DS]));\
        trap_block[current_thread_info()->cpu].thread =                 \
                task_thread_info(next);                                 \
        __asm__ __volatile__(                                           \
        "mov    %%g4, %%g7\n\t"                                         \
        "stx    %%i6, [%%sp + 2047 + 0x70]\n\t"                         \
        "stx    %%i7, [%%sp + 2047 + 0x78]\n\t"                         \
        "rdpr   %%wstate, %%o5\n\t"                                     \
        "stx    %%o6, [%%g6 + %6]\n\t"                                  \
        "stb    %%o5, [%%g6 + %5]\n\t"                                  \
        "rdpr   %%cwp, %%o5\n\t"                                        \
        "stb    %%o5, [%%g6 + %8]\n\t"                                  \
        "mov    %4, %%g6\n\t"                                           \
        "ldub   [%4 + %8], %%g1\n\t"                                    \
        "wrpr   %%g1, %%cwp\n\t"                                        \
        "ldx    [%%g6 + %6], %%o6\n\t"                                  \
        "ldub   [%%g6 + %5], %%o5\n\t"                                  \
        "ldub   [%%g6 + %7], %%o7\n\t"                                  \
        "wrpr   %%o5, 0x0, %%wstate\n\t"                                \
        "ldx    [%%sp + 2047 + 0x70], %%i6\n\t"                         \
        "ldx    [%%sp + 2047 + 0x78], %%i7\n\t"                         \
        "ldx    [%%g6 + %9], %%g4\n\t"                                  \
        "brz,pt %%o7, 1f\n\t"                                           \
        " mov   %%g7, %0\n\t"                                           \
        "sethi  %%hi(ret_from_syscall), %%g1\n\t"                       \
        "jmpl   %%g1 + %%lo(ret_from_syscall), %%g0\n\t"                \
        " nop\n\t"                                                      \
        "1:\n\t"                                                        \
        : "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \
          "=r" (__local_per_cpu_offset)                                 \
        : "0" (task_thread_info(next)),                                 \
          "i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_NEW_CHILD),            \
          "i" (TI_CWP), "i" (TI_TASK)                                   \
        : "cc",                                                         \
                "g1", "g2", "g3",                   "g7",               \
                "l1", "l2", "l3", "l4", "l5", "l6", "l7",               \
          "i0", "i1", "i2", "i3", "i4", "i5",                           \
          "o0", "o1", "o2", "o3", "o4", "o5",       "o7");              \
        /* If you fuck with this, update ret_from_syscall code too. */  \
        if (test_thread_flag(TIF_PERFCTR)) {                            \
                write_pcr(current_thread_info()->pcr_reg);              \
                reset_pic();                                            \
        }                                                               \
} while(0)

static inline unsigned long xchg32(__volatile__ unsigned int *m, unsigned int val)
{
        unsigned long tmp1, tmp2;

        __asm__ __volatile__(
"       membar          #StoreLoad | #LoadLoad\n"
"       mov             %0, %1\n"
"1:     lduw            [%4], %2\n"
"       cas             [%4], %2, %0\n"
"       cmp             %2, %0\n"
"       bne,a,pn        %%icc, 1b\n"
"        mov            %1, %0\n"
"       membar          #StoreLoad | #StoreStore\n"
        : "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
        : "0" (val), "r" (m)
        : "cc", "memory");
        return val;
}

static inline unsigned long xchg64(__volatile__ unsigned long *m, unsigned long val)
{
        unsigned long tmp1, tmp2;

        __asm__ __volatile__(
"       membar          #StoreLoad | #LoadLoad\n"
"       mov             %0, %1\n"
"1:     ldx             [%4], %2\n"
"       casx            [%4], %2, %0\n"
"       cmp             %2, %0\n"
"       bne,a,pn        %%xcc, 1b\n"
"        mov            %1, %0\n"
"       membar          #StoreLoad | #StoreStore\n"
        : "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
        : "0" (val), "r" (m)
        : "cc", "memory");
        return val;
}

#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))

extern void __xchg_called_with_bad_pointer(void);

static inline unsigned long __xchg(unsigned long x, __volatile__ void * ptr,
                                       int size)
{
        switch (size) {
        case 4:
                return xchg32(ptr, x);
        case 8:
                return xchg64(ptr, x);
        };
        __xchg_called_with_bad_pointer();
        return x;
}

extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));

/* 
 * Atomic compare and exchange.  Compare OLD with MEM, if identical,
 * store NEW in MEM.  Return the initial value in MEM.  Success is
 * indicated by comparing RETURN with OLD.
 */

#define __HAVE_ARCH_CMPXCHG 1

static inline unsigned long
__cmpxchg_u32(volatile int *m, int old, int new)
{
        __asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
                             "cas [%2], %3, %0\n\t"
                             "membar #StoreLoad | #StoreStore"
                             : "=&r" (new)
                             : "0" (new), "r" (m), "r" (old)
                             : "memory");

        return new;
}

static inline unsigned long
__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
{
        __asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
                             "casx [%2], %3, %0\n\t"
                             "membar #StoreLoad | #StoreStore"
                             : "=&r" (new)
                             : "0" (new), "r" (m), "r" (old)
                             : "memory");

        return new;
}

/* This function doesn't exist, so you'll get a linker error
   if something tries to do an invalid cmpxchg().  */
extern void __cmpxchg_called_with_bad_pointer(void);

static inline unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
{
        switch (size) {
                case 4:
                        return __cmpxchg_u32(ptr, old, new);
                case 8:
                        return __cmpxchg_u64(ptr, old, new);
        }
        __cmpxchg_called_with_bad_pointer();
        return old;
}

#define cmpxchg(ptr,o,n)                                                 \
  ({                                                                     \
     __typeof__(*(ptr)) _o_ = (o);                                       \
     __typeof__(*(ptr)) _n_ = (n);                                       \
     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,           \
                                    (unsigned long)_n_, sizeof(*(ptr))); \
  })

#endif /* !(__ASSEMBLY__) */

#define arch_align_stack(x) (x)

#endif /* !(__SPARC64_SYSTEM_H) */