Archipelago » qemu

/*

 * QEMU/mipssim emulation

 *

 * Emulates a very simple machine model similar to the one used by the

 * proprietary MIPS emulator.

 * 

 * Copyright (c) 2007 Thiemo Seufer

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "hw.h"

#include "mips.h"

#include "mips_cpudevs.h"

#include "serial.h"

#include "isa.h"

#include "net/net.h"

#include "sysemu/sysemu.h"

#include "boards.h"

#include "mips-bios.h"

#include "loader.h"

#include "elf.h"

#include "sysbus.h"

#include "exec/address-spaces.h"

static struct _loaderparams {

    int ram_size;

    const char *kernel_filename;

    const char *kernel_cmdline;

    const char *initrd_filename;

} loaderparams;

typedef struct ResetData {

    MIPSCPU *cpu;

    uint64_t vector;

} ResetData;

static int64_t load_kernel(void)

{

    int64_t entry, kernel_high;

    long kernel_size;

    long initrd_size;

    ram_addr_t initrd_offset;

    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 > loaderparams.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, loaderparams.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);

        }

    }

    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 & ~(target_ulong)1;

    if (s->vector & 1) {

        env->hflags |= MIPS_HFLAG_M16;

    }

}

static void mipsnet_init(int base, qemu_irq irq, NICInfo *nd)

{

    DeviceState *dev;

    SysBusDevice *s;

    dev = qdev_create(NULL, "mipsnet");

    qdev_set_nic_properties(dev, nd);

    qdev_init_nofail(dev);

    s = sysbus_from_qdev(dev);

    sysbus_connect_irq(s, 0, irq);

    memory_region_add_subregion(get_system_io(),

                                base,

                                sysbus_mmio_get_region(s, 0));

}

static void

mips_mipssim_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 = g_new(MemoryRegion, 1);

    MIPSCPU *cpu;

    CPUMIPSState *env;

    ResetData *reset_info;

    int bios_size;

    /* Init CPUs. */

    if (cpu_model == NULL) {

#ifdef TARGET_MIPS64

        cpu_model = "5Kf";

#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. */

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

    vmstate_register_ram_global(ram);

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

    vmstate_register_ram_global(bios);

    memory_region_set_readonly(bios, true);

    memory_region_add_subregion(address_space_mem, 0, ram);

    /* Map the BIOS / boot exception handler. */

    memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios);

    /* Load a BIOS / boot exception handler image. */

    if (bios_name == NULL)

        bios_name = BIOS_FILENAME;

    filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);

    if (filename) {

        bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);

        g_free(filename);

    } else {

        bios_size = -1;

    }

    if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {

        /* Bail out if we have neither a kernel image nor boot vector code. */

        fprintf(stderr,

                "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",

                filename);

        exit(1);

    } else {

        /* We have a boot vector start address. */

        env->active_tc.PC = (target_long)(int32_t)0xbfc00000;

    }

    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);

    /* Register 64 KB of ISA IO space at 0x1fd00000. */

    isa_mmio_init(0x1fd00000, 0x00010000);

    /* A single 16450 sits at offset 0x3f8. It is attached to

       MIPS CPU INT2, which is interrupt 4. */

    if (serial_hds[0])

        serial_init(0x3f8, env->irq[4], 115200, serial_hds[0],

                    get_system_io());

    if (nd_table[0].used)

        /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */

        mipsnet_init(0x4200, env->irq[2], &nd_table[0]);

}

static QEMUMachine mips_mipssim_machine = {

    .name = "mipssim",

    .desc = "MIPS MIPSsim platform",

    .init = mips_mipssim_init,

};

static void mips_mipssim_machine_init(void)

{

    qemu_register_machine(&mips_mipssim_machine);

}

machine_init(mips_mipssim_machine_init);