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 "hw.h"

#include "mips.h"

#include "mips_cpudevs.h"

#include "pc.h"

#include "serial.h"

#include "isa.h"

#include "net.h"

#include "sysemu.h"

#include "boards.h"

#include "flash.h"

#include "qemu-log.h"

#include "mips-bios.h"

#include "ide.h"

#include "loader.h"

#include "elf.h"

#include "mc146818rtc.h"

#include "i8254.h"

#include "blockdev.h"

#include "exec-memory.h"

#define MAX_IDE_BUS 2

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 ISADevice *pit; /* PIT i8254 */

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

static struct _loaderparams {

    int ram_size;

    const char *kernel_filename;

    const char *kernel_cmdline;

    const char *initrd_filename;

} loaderparams;

static void mips_qemu_write (void *opaque, hwaddr addr,

                             uint64_t val, unsigned size)

{

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

        qemu_system_reset_request ();

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

        qemu_system_shutdown_request ();

}

static uint64_t mips_qemu_read (void *opaque, hwaddr addr,

                                unsigned size)

{

    return 0;

}

static const MemoryRegionOps mips_qemu_ops = {

    .read = mips_qemu_read,

    .write = mips_qemu_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

typedef struct ResetData {

    MIPSCPU *cpu;

    uint64_t vector;

} ResetData;

static int64_t load_kernel(void)

{

    int64_t entry, kernel_high;

    long kernel_size, initrd_size, params_size;

    ram_addr_t initrd_offset;

    uint32_t *params_buf;

    int big_endian;

#ifdef TARGET_WORDS_BIGENDIAN

    big_endian = 1;

#else

    big_endian = 0;

#endif

    kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,

                           NULL, (uint64_t *)&entry, NULL,

                           (uint64_t *)&kernel_high, big_endian,

                           ELF_MACHINE, 1);

    if (kernel_size >= 0) {

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

            entry = (int32_t)entry;

    } else {

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

                loaderparams.kernel_filename);

        exit(1);

    }

    /* load initrd */

    initrd_size = 0;

    initrd_offset = 0;

    if (loaderparams.initrd_filename) {

        initrd_size = get_image_size (loaderparams.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",

                        loaderparams.initrd_filename);

                exit(1);

            }

            initrd_size = load_image_targphys(loaderparams.initrd_filename,

                                              initrd_offset,

                                              ram_size - initrd_offset);

        }

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

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

                    loaderparams.initrd_filename);

            exit(1);

        }

    }

    /* Store command line.  */

    params_size = 264;

    params_buf = g_malloc(params_size);

    params_buf[0] = tswap32(ram_size);

    params_buf[1] = tswap32(0x12345678);

    if (initrd_size > 0) {

        snprintf((char *)params_buf + 8, 256, "rd_start=0x%" PRIx64 " rd_size=%li %s",

                 cpu_mips_phys_to_kseg0(NULL, initrd_offset),

                 initrd_size, loaderparams.kernel_cmdline);

    } else {

        snprintf((char *)params_buf + 8, 256, "%s", loaderparams.kernel_cmdline);

    }

    rom_add_blob_fixed("params", params_buf, params_size,

                       (16 << 20) - 264);

    return entry;

}

static void main_cpu_reset(void *opaque)

{

    ResetData *s = (ResetData *)opaque;

    CPUMIPSState *env = &s->cpu->env;

    cpu_reset(CPU(s->cpu));

    env->active_tc.PC = s->vector;

}

static const int sector_len = 32 * 1024;

static

void mips_r4k_init(QEMUMachineInitArgs *args)

{

    ram_addr_t ram_size = args->ram_size;

    const char *cpu_model = args->cpu_model;

    const char *kernel_filename = args->kernel_filename;

    const char *kernel_cmdline = args->kernel_cmdline;

    const char *initrd_filename = args->initrd_filename;

    char *filename;

    MemoryRegion *address_space_mem = get_system_memory();

    MemoryRegion *ram = g_new(MemoryRegion, 1);

    MemoryRegion *bios;

    MemoryRegion *iomem = g_new(MemoryRegion, 1);

    int bios_size;

    MIPSCPU *cpu;

    CPUMIPSState *env;

    ResetData *reset_info;

    int i;

    qemu_irq *i8259;

    ISABus *isa_bus;

    DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];

    DriveInfo *dinfo;

    int be;

    /* init CPUs */

    if (cpu_model == NULL) {

#ifdef TARGET_MIPS64

        cpu_model = "R4000";

#else

        cpu_model = "24Kf";

#endif

    }

    cpu = cpu_mips_init(cpu_model);

    if (cpu == NULL) {

        fprintf(stderr, "Unable to find CPU definition\n");

        exit(1);

    }

    env = &cpu->env;

    reset_info = g_malloc0(sizeof(ResetData));

    reset_info->cpu = cpu;

    reset_info->vector = env->active_tc.PC;

    qemu_register_reset(main_cpu_reset, reset_info);

    /* allocate RAM */

    if (ram_size > (256 << 20)) {

        fprintf(stderr,

                "qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",

                ((unsigned int)ram_size / (1 << 20)));

        exit(1);

    }

    memory_region_init_ram(ram, "mips_r4k.ram", ram_size);

    vmstate_register_ram_global(ram);

    memory_region_add_subregion(address_space_mem, 0, ram);

    memory_region_init_io(iomem, &mips_qemu_ops, NULL, "mips-qemu", 0x10000);

    memory_region_add_subregion(address_space_mem, 0x1fbf0000, iomem);

    /* 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. */

    if (bios_name == NULL)

        bios_name = BIOS_FILENAME;

    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);

    if (filename) {

        bios_size = get_image_size(filename);

    } else {

        bios_size = -1;

    }

#ifdef TARGET_WORDS_BIGENDIAN

    be = 1;

#else

    be = 0;

#endif

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

        bios = g_new(MemoryRegion, 1);

        memory_region_init_ram(bios, "mips_r4k.bios", BIOS_SIZE);

        vmstate_register_ram_global(bios);

        memory_region_set_readonly(bios, true);

        memory_region_add_subregion(get_system_memory(), 0x1fc00000, bios);

        load_image_targphys(filename, 0x1fc00000, BIOS_SIZE);

    } else if ((dinfo = drive_get(IF_PFLASH, 0, 0)) != NULL) {

        uint32_t mips_rom = 0x00400000;

        if (!pflash_cfi01_register(0x1fc00000, NULL, "mips_r4k.bios", mips_rom,

                                   dinfo->bdrv, sector_len,

                                   mips_rom / sector_len,

                                   4, 0, 0, 0, 0, be)) {

            fprintf(stderr, "qemu: Error registering flash memory.\n");

        }

    }

    else {

        /* not fatal */

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

                bios_name);

    }

    if (filename) {

        g_free(filename);

    }

    if (kernel_filename) {

        loaderparams.ram_size = ram_size;

        loaderparams.kernel_filename = kernel_filename;

        loaderparams.kernel_cmdline = kernel_cmdline;

        loaderparams.initrd_filename = initrd_filename;

        reset_info->vector = load_kernel();

    }

    /* Init CPU internal devices */

    cpu_mips_irq_init_cpu(env);

    cpu_mips_clock_init(env);

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

    isa_bus = isa_bus_new(NULL, get_system_io());

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

    isa_bus_irqs(isa_bus, i8259);

    rtc_init(isa_bus, 2000, NULL);

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

    isa_mmio_init(0x14000000, 0x00010000);

    isa_mem_base = 0x10000000;

    pit = pit_init(isa_bus, 0x40, 0, NULL);

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

        if (serial_hds[i]) {

            serial_isa_init(isa_bus, i, serial_hds[i]);

        }

    }

    isa_vga_init(isa_bus);

    if (nd_table[0].used)

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

    ide_drive_get(hd, MAX_IDE_BUS);

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

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

                     hd[MAX_IDE_DEVS * i],

                     hd[MAX_IDE_DEVS * i + 1]);

    isa_create_simple(isa_bus, "i8042");

}

static QEMUMachine mips_machine = {

    .name = "mips",

    .desc = "mips r4k platform",

    .init = mips_r4k_init,

};

static void mips_machine_init(void)

{

    qemu_register_machine(&mips_machine);

}

machine_init(mips_machine_init);