// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/arch/sparc64/kernel/setup.c
 *
 *  Copyright (C) 1995,1996  David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1997       Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <asm/smp.h>
#include <linux/user.h>
#include <linux/screen_info.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/syscalls.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/inet.h>
#include <linux/console.h>
#include <linux/root_dev.h>
#include <linux/interrupt.h>
#include <linux/cpu.h>
#include <linux/initrd.h>
#include <linux/module.h>
#include <linux/start_kernel.h>
#include <linux/memblock.h>
#include <uapi/linux/mount.h>

#include <asm/io.h>
#include <asm/processor.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/idprom.h>
#include <asm/head.h>
#include <asm/starfire.h>
#include <asm/mmu_context.h>
#include <asm/timer.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/mmu.h>
#include <asm/ns87303.h>
#include <asm/btext.h>
#include <asm/elf.h>
#include <asm/mdesc.h>
#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/irq.h>

#ifdef CONFIG_IP_PNP
#include <net/ipconfig.h>
#endif

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

/* Used to synchronize accesses to NatSemi SUPER I/O chip configure
 * operations in asm/ns87303.h
 */
DEFINE_SPINLOCK(ns87303_lock);
EXPORT_SYMBOL(ns87303_lock);

struct screen_info screen_info = {
        0, 0,                   /* orig-x, orig-y */
        0,                      /* unused */
        0,                      /* orig-video-page */
        0,                      /* orig-video-mode */
        128,                    /* orig-video-cols */
        0, 0, 0,                /* unused, ega_bx, unused */
        54,                     /* orig-video-lines */
        0,                      /* orig-video-isVGA */
        16                      /* orig-video-points */
};

static void
prom_console_write(struct console *con, const char *s, unsigned int n)
{
        prom_write(s, n);
}

/* Exported for mm/init.c:paging_init. */
unsigned long cmdline_memory_size = 0;

static struct console prom_early_console = {
        .name =         "earlyprom",
        .write =        prom_console_write,
        .flags =        CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
        .index =        -1,
};

/*
 * Process kernel command line switches that are specific to the
 * SPARC or that require special low-level processing.
 */
static void __init process_switch(char c)
{
        switch (c) {
        case 'd':
        case 's':
                break;
        case 'h':
                prom_printf("boot_flags_init: Halt!\n");
                prom_halt();
                break;
        case 'p':
                prom_early_console.flags &= ~CON_BOOT;
                break;
        case 'P':
                /* Force UltraSPARC-III P-Cache on. */
                if (tlb_type != cheetah) {
                        printk("BOOT: Ignoring P-Cache force option.\n");
                        break;
                }
                cheetah_pcache_forced_on = 1;
                add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
                cheetah_enable_pcache();
                break;

        default:
                printk("Unknown boot switch (-%c)\n", c);
                break;
        }
}

static void __init boot_flags_init(char *commands)
{
        while (*commands) {
                /* Move to the start of the next "argument". */
                while (*commands == ' ')
                        commands++;

                /* Process any command switches, otherwise skip it. */
                if (*commands == '\0')
                        break;
                if (*commands == '-') {
                        commands++;
                        while (*commands && *commands != ' ')
                                process_switch(*commands++);
                        continue;
                }
                if (!strncmp(commands, "mem=", 4))
                        cmdline_memory_size = memparse(commands + 4, &commands);

                while (*commands && *commands != ' ')
                        commands++;
        }
}

extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK        0x07FF
#define RAMDISK_PROMPT_FLAG             0x8000
#define RAMDISK_LOAD_FLAG               0x4000

extern int root_mountflags;

char reboot_command[COMMAND_LINE_SIZE];

static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };

static void __init per_cpu_patch(void)
{
        struct cpuid_patch_entry *p;
        unsigned long ver;
        int is_jbus;

        if (tlb_type == spitfire && !this_is_starfire)
                return;

        is_jbus = 0;
        if (tlb_type != hypervisor) {
                __asm__ ("rdpr %%ver, %0" : "=r" (ver));
                is_jbus = ((ver >> 32UL) == __JALAPENO_ID ||
                           (ver >> 32UL) == __SERRANO_ID);
        }

        p = &__cpuid_patch;
        while (p < &__cpuid_patch_end) {
                unsigned long addr = p->addr;
                unsigned int *insns;

                switch (tlb_type) {
                case spitfire:
                        insns = &p->starfire[0];
                        break;
                case cheetah:
                case cheetah_plus:
                        if (is_jbus)
                                insns = &p->cheetah_jbus[0];
                        else
                                insns = &p->cheetah_safari[0];
                        break;
                case hypervisor:
                        insns = &p->sun4v[0];
                        break;
                default:
                        prom_printf("Unknown cpu type, halting.\n");
                        prom_halt();
                }

                *(unsigned int *) (addr +  0) = insns[0];
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr +  0));

                *(unsigned int *) (addr +  4) = insns[1];
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr +  4));

                *(unsigned int *) (addr +  8) = insns[2];
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr +  8));

                *(unsigned int *) (addr + 12) = insns[3];
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr + 12));

                p++;
        }
}

void sun4v_patch_1insn_range(struct sun4v_1insn_patch_entry *start,
                             struct sun4v_1insn_patch_entry *end)
{
        while (start < end) {
                unsigned long addr = start->addr;

                *(unsigned int *) (addr +  0) = start->insn;
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr +  0));

                start++;
        }
}

void sun4v_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
                             struct sun4v_2insn_patch_entry *end)
{
        while (start < end) {
                unsigned long addr = start->addr;

                *(unsigned int *) (addr +  0) = start->insns[0];
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr +  0));

                *(unsigned int *) (addr +  4) = start->insns[1];
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr +  4));

                start++;
        }
}

void sun_m7_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
                             struct sun4v_2insn_patch_entry *end)
{
        while (start < end) {
                unsigned long addr = start->addr;

                *(unsigned int *) (addr +  0) = start->insns[0];
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr +  0));

                *(unsigned int *) (addr +  4) = start->insns[1];
                wmb();
                __asm__ __volatile__("flush     %0" : : "r" (addr +  4));

                start++;
        }
}

static void __init sun4v_patch(void)
{
        extern void sun4v_hvapi_init(void);

        if (tlb_type != hypervisor)
                return;

        sun4v_patch_1insn_range(&__sun4v_1insn_patch,
                                &__sun4v_1insn_patch_end);

        sun4v_patch_2insn_range(&__sun4v_2insn_patch,
                                &__sun4v_2insn_patch_end);

        switch (sun4v_chip_type) {
        case SUN4V_CHIP_SPARC_M7:
        case SUN4V_CHIP_SPARC_M8:
        case SUN4V_CHIP_SPARC_SN:
                sun4v_patch_1insn_range(&__sun_m7_1insn_patch,
                                        &__sun_m7_1insn_patch_end);
                sun_m7_patch_2insn_range(&__sun_m7_2insn_patch,
                                         &__sun_m7_2insn_patch_end);
                break;
        default:
                break;
        }

        if (sun4v_chip_type != SUN4V_CHIP_NIAGARA1) {
                sun4v_patch_1insn_range(&__fast_win_ctrl_1insn_patch,
                                        &__fast_win_ctrl_1insn_patch_end);
        }

        sun4v_hvapi_init();
}

static void __init popc_patch(void)
{
        struct popc_3insn_patch_entry *p3;
        struct popc_6insn_patch_entry *p6;

        p3 = &__popc_3insn_patch;
        while (p3 < &__popc_3insn_patch_end) {
                unsigned long i, addr = p3->addr;

                for (i = 0; i < 3; i++) {
                        *(unsigned int *) (addr +  (i * 4)) = p3->insns[i];
                        wmb();
                        __asm__ __volatile__("flush     %0"
                                             : : "r" (addr +  (i * 4)));
                }

                p3++;
        }

        p6 = &__popc_6insn_patch;
        while (p6 < &__popc_6insn_patch_end) {
                unsigned long i, addr = p6->addr;

                for (i = 0; i < 6; i++) {
                        *(unsigned int *) (addr +  (i * 4)) = p6->insns[i];
                        wmb();
                        __asm__ __volatile__("flush     %0"
                                             : : "r" (addr +  (i * 4)));
                }

                p6++;
        }
}

static void __init pause_patch(void)
{
        struct pause_patch_entry *p;

        p = &__pause_3insn_patch;
        while (p < &__pause_3insn_patch_end) {
                unsigned long i, addr = p->addr;

                for (i = 0; i < 3; i++) {
                        *(unsigned int *) (addr +  (i * 4)) = p->insns[i];
                        wmb();
                        __asm__ __volatile__("flush     %0"
                                             : : "r" (addr +  (i * 4)));
                }

                p++;
        }
}

void __init start_early_boot(void)
{
        int cpu;

        check_if_starfire();
        per_cpu_patch();
        sun4v_patch();
        smp_init_cpu_poke();

        cpu = hard_smp_processor_id();
        if (cpu >= NR_CPUS) {
                prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
                            cpu, NR_CPUS);
                prom_halt();
        }
        current_thread_info()->cpu = cpu;

        time_init_early();
        prom_init_report();
        start_kernel();
}

/* On Ultra, we support all of the v8 capabilities. */
unsigned long sparc64_elf_hwcap = (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR |
                                   HWCAP_SPARC_SWAP | HWCAP_SPARC_MULDIV |
                                   HWCAP_SPARC_V9);
EXPORT_SYMBOL(sparc64_elf_hwcap);

static const char *hwcaps[] = {
        "flush", "stbar", "swap", "muldiv", "v9",
        "ultra3", "blkinit", "n2",

        /* These strings are as they appear in the machine description
         * 'hwcap-list' property for cpu nodes.
         */
        "mul32", "div32", "fsmuld", "v8plus", "popc", "vis", "vis2",
        "ASIBlkInit", "fmaf", "vis3", "hpc", "random", "trans", "fjfmau",
        "ima", "cspare", "pause", "cbcond", NULL /*reserved for crypto */,
        "adp",
};

static const char *crypto_hwcaps[] = {
        "aes", "des", "kasumi", "camellia", "md5", "sha1", "sha256",
        "sha512", "mpmul", "montmul", "montsqr", "crc32c",
};

void cpucap_info(struct seq_file *m)
{
        unsigned long caps = sparc64_elf_hwcap;
        int i, printed = 0;

        seq_puts(m, "cpucaps\t\t: ");
        for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
                unsigned long bit = 1UL << i;
                if (hwcaps[i] && (caps & bit)) {
                        seq_printf(m, "%s%s",
                                   printed ? "," : "", hwcaps[i]);
                        printed++;
                }
        }
        if (caps & HWCAP_SPARC_CRYPTO) {
                unsigned long cfr;

                __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
                for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
                        unsigned long bit = 1UL << i;
                        if (cfr & bit) {
                                seq_printf(m, "%s%s",
                                           printed ? "," : "", crypto_hwcaps[i]);
                                printed++;
                        }
                }
        }
        seq_putc(m, '\n');
}

static void __init report_one_hwcap(int *printed, const char *name)
{
        if ((*printed) == 0)
                printk(KERN_INFO "CPU CAPS: [");
        printk(KERN_CONT "%s%s",
               (*printed) ? "," : "", name);
        if (++(*printed) == 8) {
                printk(KERN_CONT "]\n");
                *printed = 0;
        }
}

static void __init report_crypto_hwcaps(int *printed)
{
        unsigned long cfr;
        int i;

        __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));

        for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
                unsigned long bit = 1UL << i;
                if (cfr & bit)
                        report_one_hwcap(printed, crypto_hwcaps[i]);
        }
}

static void __init report_hwcaps(unsigned long caps)
{
        int i, printed = 0;

        for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
                unsigned long bit = 1UL << i;
                if (hwcaps[i] && (caps & bit))
                        report_one_hwcap(&printed, hwcaps[i]);
        }
        if (caps & HWCAP_SPARC_CRYPTO)
                report_crypto_hwcaps(&printed);
        if (printed != 0)
                printk(KERN_CONT "]\n");
}

static unsigned long __init mdesc_cpu_hwcap_list(void)
{
        struct mdesc_handle *hp;
        unsigned long caps = 0;
        const char *prop;
        int len;
        u64 pn;

        hp = mdesc_grab();
        if (!hp)
                return 0;

        pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "cpu");
        if (pn == MDESC_NODE_NULL)
                goto out;

        prop = mdesc_get_property(hp, pn, "hwcap-list", &len);
        if (!prop)
                goto out;

        while (len) {
                int i, plen;

                for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
                        unsigned long bit = 1UL << i;

                        if (hwcaps[i] && !strcmp(prop, hwcaps[i])) {
                                caps |= bit;
                                break;
                        }
                }
                for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
                        if (!strcmp(prop, crypto_hwcaps[i]))
                                caps |= HWCAP_SPARC_CRYPTO;
                }

                plen = strlen(prop) + 1;
                prop += plen;
                len -= plen;
        }

out:
        mdesc_release(hp);
        return caps;
}

/* This yields a mask that user programs can use to figure out what
 * instruction set this cpu supports.
 */
static void __init init_sparc64_elf_hwcap(void)
{
        unsigned long cap = sparc64_elf_hwcap;
        unsigned long mdesc_caps;

        if (tlb_type == cheetah || tlb_type == cheetah_plus)
                cap |= HWCAP_SPARC_ULTRA3;
        else if (tlb_type == hypervisor) {
                if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1 ||
                    sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
                    sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
                    sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
                    sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC64X)
                        cap |= HWCAP_SPARC_BLKINIT;
                if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
                    sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
                    sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
                    sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
                    sun4v_chip_type == SUN4V_CHIP_SPARC64X)
                        cap |= HWCAP_SPARC_N2;
        }

        cap |= (AV_SPARC_MUL32 | AV_SPARC_DIV32 | AV_SPARC_V8PLUS);

        mdesc_caps = mdesc_cpu_hwcap_list();
        if (!mdesc_caps) {
                if (tlb_type == spitfire)
                        cap |= AV_SPARC_VIS;
                if (tlb_type == cheetah || tlb_type == cheetah_plus)
                        cap |= AV_SPARC_VIS | AV_SPARC_VIS2;
                if (tlb_type == cheetah_plus) {
                        unsigned long impl, ver;

                        __asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
                        impl = ((ver >> 32) & 0xffff);
                        if (impl == PANTHER_IMPL)
                                cap |= AV_SPARC_POPC;
                }
                if (tlb_type == hypervisor) {
                        if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1)
                                cap |= AV_SPARC_ASI_BLK_INIT;
                        if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
                            sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
                            sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
                            sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC64X)
                                cap |= (AV_SPARC_VIS | AV_SPARC_VIS2 |
                                        AV_SPARC_ASI_BLK_INIT |
                                        AV_SPARC_POPC);
                        if (sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
                            sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
                            sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
                            sun4v_chip_type == SUN4V_CHIP_SPARC64X)
                                cap |= (AV_SPARC_VIS3 | AV_SPARC_HPC |
                                        AV_SPARC_FMAF);
                }
        }
        sparc64_elf_hwcap = cap | mdesc_caps;

        report_hwcaps(sparc64_elf_hwcap);

        if (sparc64_elf_hwcap & AV_SPARC_POPC)
                popc_patch();
        if (sparc64_elf_hwcap & AV_SPARC_PAUSE)
                pause_patch();
}

void __init alloc_irqstack_bootmem(void)
{
        unsigned int i, node;

        for_each_possible_cpu(i) {
                node = cpu_to_node(i);

                softirq_stack[i] = memblock_alloc_node(THREAD_SIZE,
                                                       THREAD_SIZE, node);
                if (!softirq_stack[i])
                        panic("%s: Failed to allocate %lu bytes align=%lx nid=%d\n",
                              __func__, THREAD_SIZE, THREAD_SIZE, node);
                hardirq_stack[i] = memblock_alloc_node(THREAD_SIZE,
                                                       THREAD_SIZE, node);
                if (!hardirq_stack[i])
                        panic("%s: Failed to allocate %lu bytes align=%lx nid=%d\n",
                              __func__, THREAD_SIZE, THREAD_SIZE, node);
        }
}

void __init setup_arch(char **cmdline_p)
{
        /* Initialize PROM console and command line. */
        *cmdline_p = prom_getbootargs();
        strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
        parse_early_param();

        boot_flags_init(*cmdline_p);
#ifdef CONFIG_EARLYFB
        if (btext_find_display())
#endif
                register_console(&prom_early_console);

        if (tlb_type == hypervisor)
                pr_info("ARCH: SUN4V\n");
        else
                pr_info("ARCH: SUN4U\n");

        idprom_init();

        if (!root_flags)
                root_mountflags &= ~MS_RDONLY;
        ROOT_DEV = old_decode_dev(root_dev);
#ifdef CONFIG_BLK_DEV_RAM
        rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
#endif

        task_thread_info(&init_task)->kregs = &fake_swapper_regs;

#ifdef CONFIG_IP_PNP
        if (!ic_set_manually) {
                phandle chosen = prom_finddevice("/chosen");
                u32 cl, sv, gw;

                cl = prom_getintdefault (chosen, "client-ip", 0);
                sv = prom_getintdefault (chosen, "server-ip", 0);
                gw = prom_getintdefault (chosen, "gateway-ip", 0);
                if (cl && sv) {
                        ic_myaddr = cl;
                        ic_servaddr = sv;
                        if (gw)
                                ic_gateway = gw;
#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
                        ic_proto_enabled = 0;
#endif
                }
        }
#endif

        /* Get boot processor trap_block[] setup.  */
        init_cur_cpu_trap(current_thread_info());

        paging_init();
        init_sparc64_elf_hwcap();
        smp_fill_in_cpu_possible_map();
        /*
         * Once the OF device tree and MDESC have been setup and nr_cpus has
         * been parsed, we know the list of possible cpus.  Therefore we can
         * allocate the IRQ stacks.
         */
        alloc_irqstack_bootmem();
}

extern int stop_a_enabled;

void sun_do_break(void)
{
        if (!stop_a_enabled)
                return;

        prom_printf("\n");
        flush_user_windows();

        prom_cmdline();
}
EXPORT_SYMBOL(sun_do_break);

int stop_a_enabled = 1;
EXPORT_SYMBOL(stop_a_enabled);