mips_r4k.c 7.54 KB
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/*
 * 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.
*/
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#include "vl.h"

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#ifdef TARGET_WORDS_BIGENDIAN
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#define BIOS_FILENAME "mips_bios.bin"
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#else
#define BIOS_FILENAME "mipsel_bios.bin"
#endif
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#define PHYS_TO_VIRT(x) ((x) | ~(target_ulong)0x7fffffff)
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#define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
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static const int ide_iobase[2] = { 0x1f0, 0x170 };
static const int ide_iobase2[2] = { 0x3f6, 0x376 };
static const int ide_irq[2] = { 14, 15 };

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static int serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
static int serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };

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extern FILE *logfile;

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static PITState *pit; /* PIT i8254 */
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/*i8254 PIT is attached to the IRQ0 at PIC i8259 */
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static struct _loaderparams {
    int ram_size;
    const char *kernel_filename;
    const char *kernel_cmdline;
    const char *initrd_filename;
} loaderparams;

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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;

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static void load_kernel (CPUState *env)
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{
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    int64_t entry, kernel_low, kernel_high;
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    long kernel_size, initrd_size;
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    ram_addr_t initrd_offset;
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    kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
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                           &entry, &kernel_low, &kernel_high);
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    if (kernel_size >= 0) {
        if ((entry & ~0x7fffffffULL) == 0x80000000)
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            entry = (int32_t)entry;
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        env->PC[env->current_tc] = entry;
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    } else {
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        fprintf(stderr, "qemu: could not load kernel '%s'\n",
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                loaderparams.kernel_filename);
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        exit(1);
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    }

    /* load initrd */
    initrd_size = 0;
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    initrd_offset = 0;
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    if (loaderparams.initrd_filename) {
        initrd_size = get_image_size (loaderparams.initrd_filename);
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        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",
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                        loaderparams.initrd_filename);
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                exit(1);
            }
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            initrd_size = load_image(loaderparams.initrd_filename,
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                                     phys_ram_base + initrd_offset);
        }
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        if (initrd_size == (target_ulong) -1) {
            fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
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                    loaderparams.initrd_filename);
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            exit(1);
        }
    }

    /* Store command line.  */
    if (initrd_size > 0) {
        int ret;
        ret = sprintf(phys_ram_base + (16 << 20) - 256,
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                      "rd_start=0x" TARGET_FMT_lx " rd_size=%li ",
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                      PHYS_TO_VIRT((uint32_t)initrd_offset),
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                      initrd_size);
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        strcpy (phys_ram_base + (16 << 20) - 256 + ret,
                loaderparams.kernel_cmdline);
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    }
    else {
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        strcpy (phys_ram_base + (16 << 20) - 256,
                loaderparams.kernel_cmdline);
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    }

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    *(int32_t *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);
    *(int32_t *)(phys_ram_base + (16 << 20) - 264) = tswap32 (ram_size);
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}

static void main_cpu_reset(void *opaque)
{
    CPUState *env = opaque;
    cpu_reset(env);

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    if (loaderparams.kernel_filename)
        load_kernel (env);
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}
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static
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void mips_r4k_init (int ram_size, int vga_ram_size, const char *boot_device,
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                    DisplayState *ds, const char **fd_filename, int snapshot,
                    const char *kernel_filename, const char *kernel_cmdline,
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                    const char *initrd_filename, const char *cpu_model)
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{
    char buf[1024];
    unsigned long bios_offset;
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    int bios_size;
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    CPUState *env;
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    RTCState *rtc_state;
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    int i;
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    qemu_irq *i8259;
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    /* init CPUs */
    if (cpu_model == NULL) {
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#ifdef TARGET_MIPS64
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        cpu_model = "R4000";
#else
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        cpu_model = "24Kf";
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#endif
    }
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    env = cpu_init(cpu_model);
    if (!env) {
        fprintf(stderr, "Unable to find CPU definition\n");
        exit(1);
    }
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    register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
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    qemu_register_reset(main_cpu_reset, env);
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    /* allocate RAM */
    cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
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    if (!mips_qemu_iomemtype) {
        mips_qemu_iomemtype = cpu_register_io_memory(0, mips_qemu_read,
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                                                     mips_qemu_write, NULL);
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    }
    cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);

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    /* 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. */
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    bios_offset = ram_size + vga_ram_size;
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    if (bios_name == NULL)
        bios_name = BIOS_FILENAME;
    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
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    bios_size = load_image(buf, phys_ram_base + bios_offset);
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    if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
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	cpu_register_physical_memory(0x1fc00000,
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				     BIOS_SIZE, bios_offset | IO_MEM_ROM);
    } else {
	/* not fatal */
        fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
		buf);
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    }
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    if (kernel_filename) {
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        loaderparams.ram_size = ram_size;
        loaderparams.kernel_filename = kernel_filename;
        loaderparams.kernel_cmdline = kernel_cmdline;
        loaderparams.initrd_filename = initrd_filename;
        load_kernel (env);
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    }

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    /* Init CPU internal devices */
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    cpu_mips_irq_init_cpu(env);
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    cpu_mips_clock_init(env);
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    cpu_mips_irqctrl_init();

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    /* The PIC is attached to the MIPS CPU INT0 pin */
    i8259 = i8259_init(env->irq[2]);

    rtc_state = rtc_init(0x70, i8259[8]);
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    /* Register 64 KB of ISA IO space at 0x14000000 */
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    isa_mmio_init(0x14000000, 0x00010000);
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    isa_mem_base = 0x10000000;

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    pit = pit_init(0x40, i8259[0]);
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    for(i = 0; i < MAX_SERIAL_PORTS; i++) {
        if (serial_hds[i]) {
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            serial_init(serial_io[i], i8259[serial_irq[i]], serial_hds[i]);
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        }
    }

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    isa_vga_init(ds, phys_ram_base + ram_size, ram_size,
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                 vga_ram_size);
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    if (nd_table[0].vlan) {
        if (nd_table[0].model == NULL
            || strcmp(nd_table[0].model, "ne2k_isa") == 0) {
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            isa_ne2000_init(0x300, i8259[9], &nd_table[0]);
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        } else if (strcmp(nd_table[0].model, "?") == 0) {
            fprintf(stderr, "qemu: Supported NICs: ne2k_isa\n");
            exit (1);
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        } else {
            fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
            exit (1);
        }
    }
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    for(i = 0; i < 2; i++)
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        isa_ide_init(ide_iobase[i], ide_iobase2[i], i8259[ide_irq[i]],
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                     bs_table[2 * i], bs_table[2 * i + 1]);
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    i8042_init(i8259[1], i8259[12], 0x60);
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    ds1225y_init(0x9000, "nvram");
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}

QEMUMachine mips_machine = {
    "mips",
    "mips r4k platform",
    mips_r4k_init,
};