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 "pc.h"

#include "isa.h"

#include "net.h"

#include "sysemu.h"

#include "boards.h"

#include "flash.h"

#include "qemu-log.h"

#include "mips-bios.h"

#define PHYS_TO_VIRT(x) ((x) | ~(target_ulong)0x7fffffff)

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

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

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

static PITState *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_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;

static void load_kernel (CPUState *env)

{

    int64_t entry, kernel_low, kernel_high;

    long kernel_size, initrd_size;

    ram_addr_t initrd_offset;

    int ret;

    kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,

                           (uint64_t *)&entry, (uint64_t *)&kernel_low,

                           (uint64_t *)&kernel_high);

    if (kernel_size >= 0) {

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

            entry = (int32_t)entry;

        env->active_tc.PC = 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.  */

    if (initrd_size > 0) {

        char buf[64];

        ret = snprintf(buf, 64, "rd_start=0x" TARGET_FMT_lx " rd_size=%li ",

                       PHYS_TO_VIRT((uint32_t)initrd_offset),

                       initrd_size);

        cpu_physical_memory_write((16 << 20) - 256, (void *)buf, 64);

    } else {

        ret = 0;

    }

    pstrcpy_targphys((16 << 20) - 256 + ret, 256,

                     loaderparams.kernel_cmdline);

    stl_phys((16 << 20) - 260, 0x12345678);

    stl_phys((16 << 20) - 264, ram_size);

}

static void main_cpu_reset(void *opaque)

{

    CPUState *env = opaque;

    cpu_reset(env);

    if (loaderparams.kernel_filename)

        load_kernel (env);

}

static const int sector_len = 32 * 1024;

static

void mips_r4k_init (ram_addr_t ram_size,

                    const char *boot_device,

                    const char *kernel_filename, const char *kernel_cmdline,

                    const char *initrd_filename, const char *cpu_model)

{

    char buf[1024];

    ram_addr_t ram_offset;

    ram_addr_t bios_offset;

    int bios_size;

    CPUState *env;

    RTCState *rtc_state;

    int i;

    qemu_irq *i8259;

    int index;

    BlockDriverState *hd[MAX_IDE_BUS * MAX_IDE_DEVS];

    /* init CPUs */

    if (cpu_model == NULL) {

#ifdef TARGET_MIPS64

        cpu_model = "R4000";

#else

        cpu_model = "24Kf";

#endif

    }

    env = cpu_init(cpu_model);

    if (!env) {

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

        exit(1);

    }

    qemu_register_reset(main_cpu_reset, 0, env);

    /* 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);

    }

    ram_offset = qemu_ram_alloc(ram_size);

    cpu_register_physical_memory(0, ram_size, ram_offset | 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. */

    if (bios_name == NULL)

        bios_name = BIOS_FILENAME;

    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);

    bios_size = get_image_size(buf);

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

        bios_offset = qemu_ram_alloc(BIOS_SIZE);

        cpu_register_physical_memory(0x1fc00000, BIOS_SIZE,

                                     bios_offset | IO_MEM_ROM);

        load_image_targphys(buf, 0x1fc00000, BIOS_SIZE);

    } else if ((index = drive_get_index(IF_PFLASH, 0, 0)) > -1) {

        uint32_t mips_rom = 0x00400000;

        bios_offset = qemu_ram_alloc(mips_rom);

        if (!pflash_cfi01_register(0x1fc00000, bios_offset,

            drives_table[index].bdrv, sector_len, mips_rom / sector_len,

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

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

        }

    }

    else {

        /* not fatal */

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

                buf);

    }

    if (kernel_filename) {

        loaderparams.ram_size = ram_size;

        loaderparams.kernel_filename = kernel_filename;

        loaderparams.kernel_cmdline = kernel_cmdline;

        loaderparams.initrd_filename = initrd_filename;

        load_kernel (env);

    }

    /* 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 */

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

    rtc_state = rtc_init(0x70, i8259[8], 2000);

    /* 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]], 115200,

                        serial_hds[i]);

        }

    }

    isa_vga_init();

    if (nd_table[0].vlan)

        isa_ne2000_init(0x300, i8259[9], &nd_table[0]);

    if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {

        fprintf(stderr, "qemu: too many IDE bus\n");

        exit(1);

    }

    for(i = 0; i < MAX_IDE_BUS * MAX_IDE_DEVS; i++) {

        index = drive_get_index(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);

        if (index != -1)

            hd[i] = drives_table[index].bdrv;

        else

            hd[i] = NULL;

    }

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

        isa_ide_init(ide_iobase[i], ide_iobase2[i], i8259[ide_irq[i]],

                     hd[MAX_IDE_DEVS * i],

                     hd[MAX_IDE_DEVS * i + 1]);

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

}

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);