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"

#ifdef TARGET_WORDS_BIGENDIAN

#define BIOS_FILENAME "mips_bios.bin"

#else

#define BIOS_FILENAME "mipsel_bios.bin"

#endif

#ifdef TARGET_MIPS64

#define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)

#else

#define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)

#endif

#define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))

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

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

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

static int serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };

static int serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };

extern FILE *logfile;

static PITState *pit; /* PIT i8254 */

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

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, kernel_low, kernel_high;

    long kernel_size, initrd_size;

    ram_addr_t initrd_offset;

    kernel_size = load_elf(kernel_filename, VIRT_TO_PHYS_ADDEND,

                           &entry, &kernel_low, &kernel_high);

    if (kernel_size >= 0) {

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

            entry = (int32_t)entry;

        env->PC = entry;

    } else {

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

                kernel_filename);

        exit(1);

    }

    /* load initrd */

    initrd_size = 0;

    initrd_offset = 0;

    if (initrd_filename) {

        initrd_size = get_image_size (initrd_filename);

        if (initrd_size > 0) {

            initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;

            if (initrd_offset + initrd_size > ram_size) {

                fprintf(stderr,

                        "qemu: memory too small for initial ram disk '%s'\n",

                        initrd_filename);

                exit(1);

            }

            initrd_size = load_image(initrd_filename,

                                     phys_ram_base + initrd_offset);

        }

        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" TARGET_FMT_lx " rd_size=%li ",

                      PHYS_TO_VIRT((uint32_t)initrd_offset),

                      initrd_size);

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

    }

    else {

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

    }

    *(int32_t *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);

    *(int32_t *)(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);

}

static

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, const char *cpu_model)

{

    char buf[1024];

    unsigned long bios_offset;

    int bios_size;

    CPUState *env;

    RTCState *rtc_state;

    int i;

    mips_def_t *def;

    qemu_irq *i8259;

    /* init CPUs */

    if (cpu_model == NULL) {

#ifdef TARGET_MIPS64

        cpu_model = "R4000";

#else

        cpu_model = "24Kf";

#endif

    }

    if (mips_find_by_name(cpu_model, &def) != 0)

        def = NULL;

    env = cpu_init();

    cpu_mips_register(env, def);

    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);

    bios_size = load_image(buf, phys_ram_base + bios_offset);

    if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {

        cpu_register_physical_memory(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_irq_init_cpu(env);

    cpu_mips_clock_init(env);

    cpu_mips_irqctrl_init();

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

    i8259 = i8259_init(env->irq[2]);

    rtc_state = rtc_init(0x70, i8259[8]);

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

    isa_mmio_init(0x14000000, 0x00010000);

    isa_mem_base = 0x10000000;

    pit = pit_init(0x40, i8259[0]);

    for(i = 0; i < MAX_SERIAL_PORTS; i++) {

        if (serial_hds[i]) {

            serial_init(serial_io[i], i8259[serial_irq[i]], serial_hds[i]);

        }

    }

    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, i8259[9], &nd_table[0]);

        } else if (strcmp(nd_table[0].model, "?") == 0) {

            fprintf(stderr, "qemu: Supported NICs: ne2k_isa\n");

            exit (1);

        } 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], i8259[ide_irq[i]],

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

    i8042_init(i8259[1], i8259[12], 0x60);

    ds1225y_init(0x9000, "nvram");

}

QEMUMachine mips_machine = {

    "mips",

    "mips r4k platform",

    mips_r4k_init,

};