Archipelago » qemu

/*

 * QEMU/MIPS pseudo-board

 *

 * emulates a simple machine with ISA-like bus.

 * ISA IO space mapped to the 0x14000000 (PHYS) and

 * ISA memory at the 0x10000000 (PHYS, 16Mb in size).

 * All peripherial devices are attached to this "bus" with

 * the standard PC ISA addresses.

*/

#include "vl.h"

#define BIOS_FILENAME "mips_bios.bin"

//#define BIOS_FILENAME "system.bin"

#define KERNEL_LOAD_ADDR SIGN_EXTEND32(0x80010000)

#define INITRD_LOAD_ADDR SIGN_EXTEND32(0x80800000)

#define VIRT_TO_PHYS_ADDEND (-SIGN_EXTEND32(0x80000000LL))

static const int ide_iobase[2] = { 0x1f0, 0x170 };

static const int ide_iobase2[2] = { 0x3f6, 0x376 };

static const int ide_irq[2] = { 14, 15 };

extern FILE *logfile;

static PITState *pit; /* PIT i8254 */

/*i8254 PIT is attached to the IRQ0 at PIC i8259 */

/*The PIC is attached to the MIPS CPU INT0 pin */

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);

    }

}

static void mips_qemu_writel (void *opaque, target_phys_addr_t addr,

                              uint32_t val)

{

    if ((addr & 0xffff) == 0 && val == 42)

        qemu_system_reset_request ();

    else if ((addr & 0xffff) == 4 && val == 42)

        qemu_system_shutdown_request ();

}

static uint32_t mips_qemu_readl (void *opaque, target_phys_addr_t addr)

{

    return 0;

}

static CPUWriteMemoryFunc *mips_qemu_write[] = {

    &mips_qemu_writel,

    &mips_qemu_writel,

    &mips_qemu_writel,

};

static CPUReadMemoryFunc *mips_qemu_read[] = {

    &mips_qemu_readl,

    &mips_qemu_readl,

    &mips_qemu_readl,

};

static int mips_qemu_iomemtype = 0;

void load_kernel (CPUState *env, int ram_size, const char *kernel_filename,

                  const char *kernel_cmdline,

                  const char *initrd_filename)

{

    int64_t entry = 0;

    long kernel_size, initrd_size;

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

    if (kernel_size >= 0) {

        if ((entry & ~0x7fffffffULL) == 0x80000000)

            entry = SIGN_EXTEND32(entry);

        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 */

    initrd_size = 0;

    if (initrd_filename) {

        initrd_size = load_image(initrd_filename,

                                 phys_ram_base + INITRD_LOAD_ADDR + VIRT_TO_PHYS_ADDEND);

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

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

                    initrd_filename);

            exit(1);

        }

    }

    /* Store command line.  */

    if (initrd_size > 0) {

        int ret;

        ret = sprintf(phys_ram_base + (16 << 20) - 256,

                      "rd_start=0x" TLSZ " rd_size=%li ",

                      INITRD_LOAD_ADDR,

                      initrd_size);

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

    }

    else {

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

    }

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

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

}

static void main_cpu_reset(void *opaque)

{

    CPUState *env = opaque;

    cpu_reset(env);

    if (env->kernel_filename)

        load_kernel (env, env->ram_size, env->kernel_filename,

                     env->kernel_cmdline, env->initrd_filename);

}

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];

    unsigned long bios_offset;

    int ret;

    CPUState *env;

    static RTCState *rtc_state;

    int i;

    env = cpu_init();

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

    qemu_register_reset(main_cpu_reset, env);

    /* allocate RAM */

    cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);

    if (!mips_qemu_iomemtype) {

        mips_qemu_iomemtype = cpu_register_io_memory(0, mips_qemu_read,

                                                     mips_qemu_write, NULL);

    }

    cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);

    /* 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);

    }

    if (kernel_filename) {

        load_kernel (env, ram_size, kernel_filename, kernel_cmdline,

                     initrd_filename);

        env->ram_size = ram_size;

        env->kernel_filename = kernel_filename;

        env->kernel_cmdline = kernel_cmdline;

        env->initrd_filename = initrd_filename;

    }

    /* Init CPU internal devices */

    cpu_mips_clock_init(env);

    cpu_mips_irqctrl_init();

    rtc_state = rtc_init(0x70, 8);

    /* 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);

        }

    }

    for(i = 0; i < 2; i++)

        isa_ide_init(ide_iobase[i], ide_iobase2[i], ide_irq[i],

                     bs_table[2 * i], bs_table[2 * i + 1]);

}

QEMUMachine mips_machine = {

    "mips",

    "mips r4k platform",

    mips_r4k_init,

};