Archipelago » qemu

#include "vl.h"

#define BIOS_FILENAME "mips_bios.bin"

//#define BIOS_FILENAME "system.bin"

#define KERNEL_LOAD_ADDR 0x80010000

#define INITRD_LOAD_ADDR 0x80800000

#define VIRT_TO_PHYS_ADDEND (-0x80000000LL)

extern FILE *logfile;

static PITState *pit;

static void pic_irq_request(void *opaque, int level)

{

    CPUState *env = first_cpu;

    if (level) {

        env->CP0_Cause |= 0x00000400;

        cpu_interrupt(env, CPU_INTERRUPT_HARD);

    } else {

        env->CP0_Cause &= ~0x00000400;

        cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);

    }

}

void cpu_mips_irqctrl_init (void)

{

}

/* XXX: do not use a global */

uint32_t cpu_mips_get_random (CPUState *env)

{

    static uint32_t seed = 0;

    uint32_t idx;

    seed = seed * 314159 + 1;

    idx = (seed >> 16) % (MIPS_TLB_NB - env->CP0_Wired) + env->CP0_Wired;

    return idx;

}

/* MIPS R4K timer */

uint32_t cpu_mips_get_count (CPUState *env)

{

    return env->CP0_Count +

        (uint32_t)muldiv64(qemu_get_clock(vm_clock),

                           100 * 1000 * 1000, ticks_per_sec);

}

static void cpu_mips_update_count (CPUState *env, uint32_t count,

                                   uint32_t compare)

{

    uint64_t now, next;

    uint32_t tmp;

    tmp = count;

    if (count == compare)

        tmp++;

    now = qemu_get_clock(vm_clock);

    next = now + muldiv64(compare - tmp, ticks_per_sec, 100 * 1000 * 1000);

    if (next == now)

        next++;

#if 0

    if (logfile) {

        fprintf(logfile, "%s: 0x%08" PRIx64 " %08x %08x => 0x%08" PRIx64 "\n",

                __func__, now, count, compare, next - now);

    }

#endif

    /* Store new count and compare registers */

    env->CP0_Compare = compare;

    env->CP0_Count =

        count - (uint32_t)muldiv64(now, 100 * 1000 * 1000, ticks_per_sec);

    /* Adjust timer */

    qemu_mod_timer(env->timer, next);

}

void cpu_mips_store_count (CPUState *env, uint32_t value)

{

    cpu_mips_update_count(env, value, env->CP0_Compare);

}

void cpu_mips_store_compare (CPUState *env, uint32_t value)

{

    cpu_mips_update_count(env, cpu_mips_get_count(env), value);

    env->CP0_Cause &= ~0x00008000;

    cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);

}

static void mips_timer_cb (void *opaque)

{

    CPUState *env;

    env = opaque;

#if 0

    if (logfile) {

        fprintf(logfile, "%s\n", __func__);

    }

#endif

    cpu_mips_update_count(env, cpu_mips_get_count(env), env->CP0_Compare);

    env->CP0_Cause |= 0x00008000;

    cpu_interrupt(env, CPU_INTERRUPT_HARD);

}

void cpu_mips_clock_init (CPUState *env)

{

    env->timer = qemu_new_timer(vm_clock, &mips_timer_cb, env);

    env->CP0_Compare = 0;

    cpu_mips_update_count(env, 1, 0);

}

void mips_r4k_init (int ram_size, int vga_ram_size, int boot_device,

                    DisplayState *ds, const char **fd_filename, int snapshot,

                    const char *kernel_filename, const char *kernel_cmdline,

                    const char *initrd_filename)

{

    char buf[1024];

    int64_t entry = 0;

    unsigned long bios_offset;

    int ret;

    CPUState *env;

    long kernel_size;

    env = cpu_init();

    register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);

    /* allocate RAM */

    cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);

    /* Try to load a BIOS image. If this fails, we continue regardless,

       but initialize the hardware ourselves. When a kernel gets

       preloaded we also initialize the hardware, since the BIOS wasn't

       run. */

    bios_offset = ram_size + vga_ram_size;

    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, BIOS_FILENAME);

    ret = load_image(buf, phys_ram_base + bios_offset);

    if (ret == BIOS_SIZE) {

        cpu_register_physical_memory((uint32_t)(0x1fc00000),

                                     BIOS_SIZE, bios_offset | IO_MEM_ROM);

    } else {

        /* not fatal */

        fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",

                buf);

    }

    kernel_size = 0;

    if (kernel_filename) {

        kernel_size = load_elf(kernel_filename, VIRT_TO_PHYS_ADDEND, &entry);

        if (kernel_size >= 0)

            env->PC = entry;

        else {

            kernel_size = load_image(kernel_filename,

                                     phys_ram_base + KERNEL_LOAD_ADDR + VIRT_TO_PHYS_ADDEND);

            if (kernel_size < 0) {

                fprintf(stderr, "qemu: could not load kernel '%s'\n",

                        kernel_filename);

                exit(1);

            }

            env->PC = KERNEL_LOAD_ADDR;

        }

        /* load initrd */

        if (initrd_filename) {

            if (load_image(initrd_filename,

                           phys_ram_base + INITRD_LOAD_ADDR + VIRT_TO_PHYS_ADDEND)

                == (target_ulong) -1) {

                fprintf(stderr, "qemu: could not load initial ram disk '%s'\n", 

                        initrd_filename);

                exit(1);

            }

        }

        /* Store command line.  */

        strcpy (phys_ram_base + (16 << 20) - 256, kernel_cmdline);

        /* FIXME: little endian support */

        *(int *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);

        *(int *)(phys_ram_base + (16 << 20) - 264) = tswap32 (ram_size);

    }

    /* Init internal devices */

    cpu_mips_clock_init(env);

    cpu_mips_irqctrl_init();

    /* Register 64 KB of ISA IO space at 0x14000000 */

    isa_mmio_init(0x14000000, 0x00010000);

    isa_mem_base = 0x10000000;

    isa_pic = pic_init(pic_irq_request, env);

    pit = pit_init(0x40, 0);

    serial_init(&pic_set_irq_new, isa_pic, 0x3f8, 4, serial_hds[0]);

    isa_vga_init(ds, phys_ram_base + ram_size, ram_size, 

                 vga_ram_size);

    if (nd_table[0].vlan) {

        if (nd_table[0].model == NULL

            || strcmp(nd_table[0].model, "ne2k_isa") == 0) {

            isa_ne2000_init(0x300, 9, &nd_table[0]);

        } else {

            fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);

            exit (1);

        }

    }

}

QEMUMachine mips_machine = {

    "mips",

    "mips r4k platform",

    mips_r4k_init,

};