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

extern FILE *logfile;

static void pic_irq_request(void *opaque, int level)

{

    if (level) {

        cpu_single_env->CP0_Cause |= 0x00000400;

        cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);

    } else {

        cpu_single_env->CP0_Cause &= ~0x00000400;

        cpu_reset_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);

    }

}

void cpu_mips_irqctrl_init (void)

{

}

uint32_t cpu_mips_get_random (CPUState *env)

{

    uint32_t now = qemu_get_clock(vm_clock);

    return now % (MIPS_TLB_NB - env->CP0_Wired) + env->CP0_Wired;

}

/* 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 1

    if (logfile) {

        fprintf(logfile, "%s: 0x%08llx %08x %08x => 0x%08llx\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);

    pic_set_irq(5, 0);

}

static void mips_timer_cb (void *opaque)

{

    CPUState *env;

    env = opaque;

#if 1

    if (logfile) {

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

    }

#endif

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

    pic_set_irq(5, 1);

}

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);

}

static void io_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)

{

    if (logfile)

        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, value);

    cpu_outb(NULL, addr & 0xffff, value);

}

static uint32_t io_readb (void *opaque, target_phys_addr_t addr)

{

    uint32_t ret = cpu_inb(NULL, addr & 0xffff);

    if (logfile)

        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, ret);

    return ret;

}

static void io_writew (void *opaque, target_phys_addr_t addr, uint32_t value)

{

    if (logfile)

        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, value);

#ifdef TARGET_WORDS_BIGENDIAN

    value = bswap16(value);

#endif

    cpu_outw(NULL, addr & 0xffff, value);

}

static uint32_t io_readw (void *opaque, target_phys_addr_t addr)

{

    uint32_t ret = cpu_inw(NULL, addr & 0xffff);

#ifdef TARGET_WORDS_BIGENDIAN

    ret = bswap16(ret);

#endif

    if (logfile)

        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, ret);

    return ret;

}

static void io_writel (void *opaque, target_phys_addr_t addr, uint32_t value)

{

    if (logfile)

        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, value);

#ifdef TARGET_WORDS_BIGENDIAN

    value = bswap32(value);

#endif

    cpu_outl(NULL, addr & 0xffff, value);

}

static uint32_t io_readl (void *opaque, target_phys_addr_t addr)

{

    uint32_t ret = cpu_inl(NULL, addr & 0xffff);

#ifdef TARGET_WORDS_BIGENDIAN

    ret = bswap32(ret);

#endif

    if (logfile)

        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, ret);

    return ret;

}

CPUWriteMemoryFunc *io_write[] = {

    &io_writeb,

    &io_writew,

    &io_writel,

};

CPUReadMemoryFunc *io_read[] = {

    &io_readb,

    &io_readw,

    &io_readl,

};

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];

    target_ulong kernel_base, kernel_size, initrd_base, initrd_size;

    unsigned long bios_offset;

    int io_memory;

    int linux_boot;

    int ret;

    printf("%s: start\n", __func__);

    linux_boot = (kernel_filename != NULL);

    /* allocate RAM */

    cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);

    bios_offset = ram_size + vga_ram_size;

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

    printf("%s: load BIOS '%s' size %d\n", __func__, buf, BIOS_SIZE);

    ret = load_image(buf, phys_ram_base + bios_offset);

    if (ret != BIOS_SIZE) {

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

        exit(1);

    }

    cpu_register_physical_memory((uint32_t)(0x1fc00000),

                                 BIOS_SIZE, bios_offset | IO_MEM_ROM);

#if 0

    memcpy(phys_ram_base + 0x10000, phys_ram_base + bios_offset, BIOS_SIZE);

    cpu_single_env->PC = 0x80010004;

#else

    cpu_single_env->PC = 0xBFC00004;

#endif

    if (linux_boot) {

        kernel_base = KERNEL_LOAD_ADDR;

        /* now we can load the kernel */

        kernel_size = load_image(kernel_filename,

                                phys_ram_base + (kernel_base - 0x80000000));

        if (kernel_size == (target_ulong) -1) {

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

                    kernel_filename);

            exit(1);

        }

        /* load initrd */

        if (initrd_filename) {

            initrd_base = INITRD_LOAD_ADDR;

            initrd_size = load_image(initrd_filename,

                                     phys_ram_base + initrd_base);

            if (initrd_size == (target_ulong) -1) {

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

                        initrd_filename);

                exit(1);

            }

        } else {

            initrd_base = 0;

            initrd_size = 0;

        }

        cpu_single_env->PC = KERNEL_LOAD_ADDR;

    } else {

        kernel_base = 0;

        kernel_size = 0;

        initrd_base = 0;

        initrd_size = 0;

    }

    /* Init internal devices */

    cpu_mips_clock_init(cpu_single_env);

    cpu_mips_irqctrl_init();

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

    io_memory = cpu_register_io_memory(0, io_read, io_write, NULL);

    cpu_register_physical_memory(0x14000000, 0x00010000, io_memory);

    isa_mem_base = 0x10000000;

    isa_pic = pic_init(pic_irq_request, cpu_single_env);

    serial_init(0x3f8, 4, serial_hds[0]);

    vga_initialize(NULL, ds, phys_ram_base + ram_size, ram_size, 

                   vga_ram_size);

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

}

QEMUMachine mips_machine = {

    "mips",

    "mips r4k platform",

    mips_r4k_init,

};