Archipelago » qemu

/*

 * QEMU PC System Emulator

 * 

 * Copyright (c) 2003-2004 Fabrice Bellard

 * 

 * 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 "vl.h"

/* output Bochs bios info messages */

//#define DEBUG_BIOS

#define BIOS_FILENAME "bios.bin"

#define VGABIOS_FILENAME "vgabios.bin"

#define VGABIOS_CIRRUS_FILENAME "vgabios-cirrus.bin"

#define LINUX_BOOT_FILENAME "linux_boot.bin"

#define KERNEL_LOAD_ADDR     0x00100000

#define INITRD_LOAD_ADDR     0x00600000

#define KERNEL_PARAMS_ADDR   0x00090000

#define KERNEL_CMDLINE_ADDR  0x00099000

static fdctrl_t *floppy_controller;

static RTCState *rtc_state;

static PITState *pit;

static IOAPICState *ioapic;

static void ioport80_write(void *opaque, uint32_t addr, uint32_t data)

{

}

/* MSDOS compatibility mode FPU exception support */

/* XXX: add IGNNE support */

void cpu_set_ferr(CPUX86State *s)

{

    pic_set_irq(13, 1);

}

static void ioportF0_write(void *opaque, uint32_t addr, uint32_t data)

{

    pic_set_irq(13, 0);

}

/* TSC handling */

uint64_t cpu_get_tsc(CPUX86State *env)

{

    return qemu_get_clock(vm_clock);

}

/* IRQ handling */

int cpu_get_pic_interrupt(CPUState *env)

{

    int intno;

    intno = apic_get_interrupt(env);

    if (intno >= 0) {

        /* set irq request if a PIC irq is still pending */

        /* XXX: improve that */

        pic_update_irq(isa_pic); 

        return intno;

    }

    /* read the irq from the PIC */

    intno = pic_read_irq(isa_pic);

    return intno;

}

static void pic_irq_request(void *opaque, int level)

{

    CPUState *env = opaque;

    if (level)

        cpu_interrupt(env, CPU_INTERRUPT_HARD);

    else

        cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);

}

/* PC cmos mappings */

#define REG_EQUIPMENT_BYTE          0x14

#define REG_IBM_CENTURY_BYTE        0x32

#define REG_IBM_PS2_CENTURY_BYTE    0x37

static inline int to_bcd(RTCState *s, int a)

{

    return ((a / 10) << 4) | (a % 10);

}

static int cmos_get_fd_drive_type(int fd0)

{

    int val;

    switch (fd0) {

    case 0:

        /* 1.44 Mb 3"5 drive */

        val = 4;

        break;

    case 1:

        /* 2.88 Mb 3"5 drive */

        val = 5;

        break;

    case 2:

        /* 1.2 Mb 5"5 drive */

        val = 2;

        break;

    default:

        val = 0;

        break;

    }

    return val;

}

static void cmos_init_hd(int type_ofs, int info_ofs, BlockDriverState *hd) 

{

    RTCState *s = rtc_state;

    int cylinders, heads, sectors;

    bdrv_get_geometry_hint(hd, &cylinders, &heads, &sectors);

    rtc_set_memory(s, type_ofs, 47);

    rtc_set_memory(s, info_ofs, cylinders);

    rtc_set_memory(s, info_ofs + 1, cylinders >> 8);

    rtc_set_memory(s, info_ofs + 2, heads);

    rtc_set_memory(s, info_ofs + 3, 0xff);

    rtc_set_memory(s, info_ofs + 4, 0xff);

    rtc_set_memory(s, info_ofs + 5, 0xc0 | ((heads > 8) << 3));

    rtc_set_memory(s, info_ofs + 6, cylinders);

    rtc_set_memory(s, info_ofs + 7, cylinders >> 8);

    rtc_set_memory(s, info_ofs + 8, sectors);

}

/* hd_table must contain 4 block drivers */

static void cmos_init(int ram_size, int boot_device, BlockDriverState **hd_table)

{

    RTCState *s = rtc_state;

    int val;

    int fd0, fd1, nb;

    time_t ti;

    struct tm *tm;

    int i;

    /* set the CMOS date */

    time(&ti);

    if (rtc_utc)

        tm = gmtime(&ti);

    else

        tm = localtime(&ti);

    rtc_set_date(s, tm);

    val = to_bcd(s, (tm->tm_year / 100) + 19);

    rtc_set_memory(s, REG_IBM_CENTURY_BYTE, val);

    rtc_set_memory(s, REG_IBM_PS2_CENTURY_BYTE, val);

    /* various important CMOS locations needed by PC/Bochs bios */

    /* memory size */

    val = 640; /* base memory in K */

    rtc_set_memory(s, 0x15, val);

    rtc_set_memory(s, 0x16, val >> 8);

    val = (ram_size / 1024) - 1024;

    if (val > 65535)

        val = 65535;

    rtc_set_memory(s, 0x17, val);

    rtc_set_memory(s, 0x18, val >> 8);

    rtc_set_memory(s, 0x30, val);

    rtc_set_memory(s, 0x31, val >> 8);

    if (ram_size > (16 * 1024 * 1024))

        val = (ram_size / 65536) - ((16 * 1024 * 1024) / 65536);

    else

        val = 0;

    if (val > 65535)

        val = 65535;

    rtc_set_memory(s, 0x34, val);

    rtc_set_memory(s, 0x35, val >> 8);

    switch(boot_device) {

    case 'a':

    case 'b':

        rtc_set_memory(s, 0x3d, 0x01); /* floppy boot */

        break;

    default:

    case 'c':

        rtc_set_memory(s, 0x3d, 0x02); /* hard drive boot */

        break;

    case 'd':

        rtc_set_memory(s, 0x3d, 0x03); /* CD-ROM boot */

        break;

    }

    /* floppy type */

    fd0 = fdctrl_get_drive_type(floppy_controller, 0);

    fd1 = fdctrl_get_drive_type(floppy_controller, 1);

    val = (cmos_get_fd_drive_type(fd0) << 4) | cmos_get_fd_drive_type(fd1);

    rtc_set_memory(s, 0x10, val);

    val = 0;

    nb = 0;

    if (fd0 < 3)

        nb++;

    if (fd1 < 3)

        nb++;

    switch (nb) {

    case 0:

        break;

    case 1:

        val |= 0x01; /* 1 drive, ready for boot */

        break;

    case 2:

        val |= 0x41; /* 2 drives, ready for boot */

        break;

    }

    val |= 0x02; /* FPU is there */

    val |= 0x04; /* PS/2 mouse installed */

    rtc_set_memory(s, REG_EQUIPMENT_BYTE, val);

    /* hard drives */

    rtc_set_memory(s, 0x12, (hd_table[0] ? 0xf0 : 0) | (hd_table[1] ? 0x0f : 0));

    if (hd_table[0])

        cmos_init_hd(0x19, 0x1b, hd_table[0]);

    if (hd_table[1]) 

        cmos_init_hd(0x1a, 0x24, hd_table[1]);

    val = 0;

    for (i = 0; i < 4; i++) {

        if (hd_table[i]) {

            int cylinders, heads, sectors, translation;

            /* NOTE: bdrv_get_geometry_hint() returns the physical

                geometry.  It is always such that: 1 <= sects <= 63, 1

                <= heads <= 16, 1 <= cylinders <= 16383. The BIOS

                geometry can be different if a translation is done. */

            translation = bdrv_get_translation_hint(hd_table[i]);

            if (translation == BIOS_ATA_TRANSLATION_AUTO) {

                bdrv_get_geometry_hint(hd_table[i], &cylinders, &heads, &sectors);

                if (cylinders <= 1024 && heads <= 16 && sectors <= 63) {

                    /* No translation. */

                    translation = 0;

                } else {

                    /* LBA translation. */

                    translation = 1;

                }

            } else {

                translation--;

            }

            val |= translation << (i * 2);

        }

    }

    rtc_set_memory(s, 0x39, val);

    /* Disable check of 0x55AA signature on the last two bytes of

       first sector of disk. XXX: make it the default ? */

    //    rtc_set_memory(s, 0x38, 1);

}

void ioport_set_a20(int enable)

{

    /* XXX: send to all CPUs ? */

    cpu_x86_set_a20(first_cpu, enable);

}

int ioport_get_a20(void)

{

    return ((first_cpu->a20_mask >> 20) & 1);

}

static void ioport92_write(void *opaque, uint32_t addr, uint32_t val)

{

    ioport_set_a20((val >> 1) & 1);

    /* XXX: bit 0 is fast reset */

}

static uint32_t ioport92_read(void *opaque, uint32_t addr)

{

    return ioport_get_a20() << 1;

}

/***********************************************************/

/* Bochs BIOS debug ports */

void bochs_bios_write(void *opaque, uint32_t addr, uint32_t val)

{

    static const char shutdown_str[8] = "Shutdown";

    static int shutdown_index = 0;

    switch(addr) {

        /* Bochs BIOS messages */

    case 0x400:

    case 0x401:

        fprintf(stderr, "BIOS panic at rombios.c, line %d\n", val);

        exit(1);

    case 0x402:

    case 0x403:

#ifdef DEBUG_BIOS

        fprintf(stderr, "%c", val);

#endif

        break;

    case 0x8900:

        /* same as Bochs power off */

        if (val == shutdown_str[shutdown_index]) {

            shutdown_index++;

            if (shutdown_index == 8) {

                shutdown_index = 0;

                qemu_system_shutdown_request();

            }

        } else {

            shutdown_index = 0;

        }

        break;

        /* LGPL'ed VGA BIOS messages */

    case 0x501:

    case 0x502:

        fprintf(stderr, "VGA BIOS panic, line %d\n", val);

        exit(1);

    case 0x500:

    case 0x503:

#ifdef DEBUG_BIOS

        fprintf(stderr, "%c", val);

#endif

        break;

    }

}

void bochs_bios_init(void)

{

    register_ioport_write(0x400, 1, 2, bochs_bios_write, NULL);

    register_ioport_write(0x401, 1, 2, bochs_bios_write, NULL);

    register_ioport_write(0x402, 1, 1, bochs_bios_write, NULL);

    register_ioport_write(0x403, 1, 1, bochs_bios_write, NULL);

    register_ioport_write(0x8900, 1, 1, bochs_bios_write, NULL);

    register_ioport_write(0x501, 1, 2, bochs_bios_write, NULL);

    register_ioport_write(0x502, 1, 2, bochs_bios_write, NULL);

    register_ioport_write(0x500, 1, 1, bochs_bios_write, NULL);

    register_ioport_write(0x503, 1, 1, bochs_bios_write, NULL);

}

int load_kernel(const char *filename, uint8_t *addr, 

                uint8_t *real_addr)

{

    int fd, size;

    int setup_sects;

    fd = open(filename, O_RDONLY | O_BINARY);

    if (fd < 0)

        return -1;

    /* load 16 bit code */

    if (read(fd, real_addr, 512) != 512)

        goto fail;

    setup_sects = real_addr[0x1F1];

    if (!setup_sects)

        setup_sects = 4;

    if (read(fd, real_addr + 512, setup_sects * 512) != 

        setup_sects * 512)

        goto fail;

    /* load 32 bit code */

    size = read(fd, addr, 16 * 1024 * 1024);

    if (size < 0)

        goto fail;

    close(fd);

    return size;

 fail:

    close(fd);

    return -1;

}

static void main_cpu_reset(void *opaque)

{

    CPUState *env = opaque;

    cpu_reset(env);

}

/*************************************************/

static void putb(uint8_t **pp, int val)

{

    uint8_t *q;

    q = *pp;

    *q++ = val;

    *pp = q;

}

static void putstr(uint8_t **pp, const char *str)

{

    uint8_t *q;

    q = *pp;

    while (*str)

        *q++ = *str++;

    *pp = q;

}

static void putle16(uint8_t **pp, int val)

{

    uint8_t *q;

    q = *pp;

    *q++ = val;

    *q++ = val >> 8;

    *pp = q;

}

static void putle32(uint8_t **pp, int val)

{

    uint8_t *q;

    q = *pp;

    *q++ = val;

    *q++ = val >> 8;

    *q++ = val >> 16;

    *q++ = val >> 24;

    *pp = q;

}

static int mpf_checksum(const uint8_t *data, int len)

{

    int sum, i;

    sum = 0;

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

        sum += data[i];

    return sum & 0xff;

}

/* Build the Multi Processor table in the BIOS. Same values as Bochs. */

static void bios_add_mptable(uint8_t *bios_data)

{

    uint8_t *mp_config_table, *q, *float_pointer_struct;

    int ioapic_id, offset, i, len;

    if (smp_cpus <= 1)

        return;

    mp_config_table = bios_data + 0xb000;

    q = mp_config_table;

    putstr(&q, "PCMP"); /* "PCMP signature */

    putle16(&q, 0); /* table length (patched later) */

    putb(&q, 4); /* spec rev */

    putb(&q, 0); /* checksum (patched later) */

    putstr(&q, "QEMUCPU "); /* OEM id */

    putstr(&q, "0.1         "); /* vendor id */

    putle32(&q, 0); /* OEM table ptr */

    putle16(&q, 0); /* OEM table size */

    putle16(&q, 20); /* entry count */

    putle32(&q, 0xfee00000); /* local APIC addr */

    putle16(&q, 0); /* ext table length */

    putb(&q, 0); /* ext table checksum */

    putb(&q, 0); /* reserved */

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

        putb(&q, 0); /* entry type = processor */

        putb(&q, i); /* APIC id */

        putb(&q, 0x11); /* local APIC version number */

        if (i == 0)

            putb(&q, 3); /* cpu flags: enabled, bootstrap cpu */

        else

            putb(&q, 1); /* cpu flags: enabled */

        putb(&q, 0); /* cpu signature */

        putb(&q, 6);

        putb(&q, 0);

        putb(&q, 0);

        putle16(&q, 0x201); /* feature flags */

        putle16(&q, 0);

        putle16(&q, 0); /* reserved */

        putle16(&q, 0);

        putle16(&q, 0);

        putle16(&q, 0);

    }

    /* isa bus */

    putb(&q, 1); /* entry type = bus */

    putb(&q, 0); /* bus ID */

    putstr(&q, "ISA   ");

    /* ioapic */

    ioapic_id = smp_cpus;

    putb(&q, 2); /* entry type = I/O APIC */

    putb(&q, ioapic_id); /* apic ID */

    putb(&q, 0x11); /* I/O APIC version number */

    putb(&q, 1); /* enable */

    putle32(&q, 0xfec00000); /* I/O APIC addr */

    /* irqs */

    for(i = 0; i < 16; i++) {

        putb(&q, 3); /* entry type = I/O interrupt */

        putb(&q, 0); /* interrupt type = vectored interrupt */

        putb(&q, 0); /* flags: po=0, el=0 */

        putb(&q, 0);

        putb(&q, 0); /* source bus ID = ISA */

        putb(&q, i); /* source bus IRQ */

        putb(&q, ioapic_id); /* dest I/O APIC ID */

        putb(&q, i); /* dest I/O APIC interrupt in */

    }

    /* patch length */

    len = q - mp_config_table;

    mp_config_table[4] = len;

    mp_config_table[5] = len >> 8;

    mp_config_table[7] = -mpf_checksum(mp_config_table, q - mp_config_table);

    /* align to 16 */

    offset = q - bios_data;

    offset = (offset + 15) & ~15;

    float_pointer_struct = bios_data + offset;

    /* floating pointer structure */

    q = float_pointer_struct;

    putstr(&q, "_MP_");

    /* pointer to MP config table */

    putle32(&q, mp_config_table - bios_data + 0x000f0000); 

    putb(&q, 1); /* length in 16 byte units */

    putb(&q, 4); /* MP spec revision */

    putb(&q, 0); /* checksum (patched later) */

    putb(&q, 0); /* MP feature byte 1 */

    putb(&q, 0);

    putb(&q, 0);

    putb(&q, 0);

    putb(&q, 0);

    float_pointer_struct[10] = 

        -mpf_checksum(float_pointer_struct, q - float_pointer_struct);

}

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

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

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

#define NE2000_NB_MAX 6

static int ne2000_io[NE2000_NB_MAX] = { 0x300, 0x320, 0x340, 0x360, 0x280, 0x380 };

static int ne2000_irq[NE2000_NB_MAX] = { 9, 10, 11, 3, 4, 5 };

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

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

static int parallel_io[MAX_PARALLEL_PORTS] = { 0x378, 0x278, 0x3bc };

static int parallel_irq[MAX_PARALLEL_PORTS] = { 7, 7, 7 };

#ifdef HAS_AUDIO

static void audio_init (PCIBus *pci_bus)

{

    struct soundhw *c;

    int audio_enabled = 0;

    for (c = soundhw; !audio_enabled && c->name; ++c) {

        audio_enabled = c->enabled;

    }

    if (audio_enabled) {

        AudioState *s;

        s = AUD_init ();

        if (s) {

            for (c = soundhw; c->name; ++c) {

                if (c->enabled) {

                    if (c->isa) {

                        c->init.init_isa (s);

                    }

                    else {

                        if (pci_bus) {

                            c->init.init_pci (pci_bus, s);

                        }

                    }

                }

            }

        }

    }

}

#endif

static void pc_init_ne2k_isa(NICInfo *nd)

{

    static int nb_ne2k = 0;

    if (nb_ne2k == NE2000_NB_MAX)

        return;

    isa_ne2000_init(ne2000_io[nb_ne2k], ne2000_irq[nb_ne2k], nd);

    nb_ne2k++;

}

/* PC hardware initialisation */

static void pc_init1(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,

                     int pci_enabled)

{

    char buf[1024];

    int ret, linux_boot, initrd_size, i;

    unsigned long bios_offset, vga_bios_offset;

    int bios_size, isa_bios_size;

    PCIBus *pci_bus;

    int piix3_devfn = -1;

    CPUState *env;

    NICInfo *nd;

    linux_boot = (kernel_filename != NULL);

    /* init CPUs */

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

        env = cpu_init();

        if (i != 0)

            env->hflags |= HF_HALTED_MASK;

        if (smp_cpus > 1) {

            /* XXX: enable it in all cases */

            env->cpuid_features |= CPUID_APIC;

        }

        register_savevm("cpu", i, 3, cpu_save, cpu_load, env);

        qemu_register_reset(main_cpu_reset, env);

        if (pci_enabled) {

            apic_init(env);

        }

    }

    /* allocate RAM */

    cpu_register_physical_memory(0, ram_size, 0);

    /* BIOS load */

    bios_offset = ram_size + vga_ram_size;

    vga_bios_offset = bios_offset + 256 * 1024;

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

    bios_size = get_image_size(buf);

    if (bios_size <= 0 || 

        (bios_size % 65536) != 0 ||

        bios_size > (256 * 1024)) {

        goto bios_error;

    }

    ret = load_image(buf, phys_ram_base + bios_offset);

    if (ret != bios_size) {

    bios_error:

        fprintf(stderr, "qemu: could not load PC bios '%s'\n", buf);

        exit(1);

    }

    if (bios_size == 65536) {

        bios_add_mptable(phys_ram_base + bios_offset);

    }

    /* VGA BIOS load */

    if (cirrus_vga_enabled) {

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

    } else {

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

    }

    ret = load_image(buf, phys_ram_base + vga_bios_offset);

    /* setup basic memory access */

    cpu_register_physical_memory(0xc0000, 0x10000, 

                                 vga_bios_offset | IO_MEM_ROM);

    /* map the last 128KB of the BIOS in ISA space */

    isa_bios_size = bios_size;

    if (isa_bios_size > (128 * 1024))

        isa_bios_size = 128 * 1024;

    cpu_register_physical_memory(0xd0000, (192 * 1024) - isa_bios_size, 

                                 IO_MEM_UNASSIGNED);

    cpu_register_physical_memory(0x100000 - isa_bios_size, 

                                 isa_bios_size, 

                                 (bios_offset + bios_size - isa_bios_size) | IO_MEM_ROM);

    /* map all the bios at the top of memory */

    cpu_register_physical_memory((uint32_t)(-bios_size), 

                                 bios_size, bios_offset | IO_MEM_ROM);

    bochs_bios_init();

    if (linux_boot) {

        uint8_t bootsect[512];

        uint8_t old_bootsect[512];

        if (bs_table[0] == NULL) {

            fprintf(stderr, "A disk image must be given for 'hda' when booting a Linux kernel\n");

            exit(1);

        }

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

        ret = load_image(buf, bootsect);

        if (ret != sizeof(bootsect)) {

            fprintf(stderr, "qemu: could not load linux boot sector '%s'\n",

                    buf);

            exit(1);

        }

        if (bdrv_read(bs_table[0], 0, old_bootsect, 1) >= 0) {

            /* copy the MSDOS partition table */

            memcpy(bootsect + 0x1be, old_bootsect + 0x1be, 0x40);

        }

        bdrv_set_boot_sector(bs_table[0], bootsect, sizeof(bootsect));

        /* now we can load the kernel */

        ret = load_kernel(kernel_filename, 

                          phys_ram_base + KERNEL_LOAD_ADDR,

                          phys_ram_base + KERNEL_PARAMS_ADDR);

        if (ret < 0) {

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

                    kernel_filename);

            exit(1);

        }

        /* load initrd */

        initrd_size = 0;

        if (initrd_filename) {

            initrd_size = load_image(initrd_filename, phys_ram_base + INITRD_LOAD_ADDR);

            if (initrd_size < 0) {

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

                        initrd_filename);

                exit(1);

            }

        }

        if (initrd_size > 0) {

            stl_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x218, INITRD_LOAD_ADDR);

            stl_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x21c, initrd_size);

        }

        pstrcpy(phys_ram_base + KERNEL_CMDLINE_ADDR, 4096,

                kernel_cmdline);

        stw_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x20, 0xA33F);

        stw_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x22,

                KERNEL_CMDLINE_ADDR - KERNEL_PARAMS_ADDR);

        /* loader type */

        stw_raw(phys_ram_base + KERNEL_PARAMS_ADDR + 0x210, 0x01);

    }

    if (pci_enabled) {

        pci_bus = i440fx_init();

        piix3_devfn = piix3_init(pci_bus);

    } else {

        pci_bus = NULL;

    }

    /* init basic PC hardware */

    register_ioport_write(0x80, 1, 1, ioport80_write, NULL);

    register_ioport_write(0xf0, 1, 1, ioportF0_write, NULL);

    if (cirrus_vga_enabled) {

        if (pci_enabled) {

            pci_cirrus_vga_init(pci_bus, 

                                ds, phys_ram_base + ram_size, ram_size, 

                                vga_ram_size);

        } else {

            isa_cirrus_vga_init(ds, phys_ram_base + ram_size, ram_size, 

                                vga_ram_size);

        }

    } else {

        vga_initialize(pci_bus, ds, phys_ram_base + ram_size, ram_size, 

                       vga_ram_size, 0, 0);

    }

    rtc_state = rtc_init(0x70, 8);

    register_ioport_read(0x92, 1, 1, ioport92_read, NULL);

    register_ioport_write(0x92, 1, 1, ioport92_write, NULL);

    if (pci_enabled) {

        ioapic = ioapic_init();

    }

    isa_pic = pic_init(pic_irq_request, first_cpu);

    pit = pit_init(0x40, 0);

    pcspk_init(pit);

    if (pci_enabled) {

        pic_set_alt_irq_func(isa_pic, ioapic_set_irq, ioapic);

    }

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

        if (serial_hds[i]) {

            serial_init(&pic_set_irq_new, isa_pic,

                        serial_io[i], serial_irq[i], serial_hds[i]);

        }

    }

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

        if (parallel_hds[i]) {

            parallel_init(parallel_io[i], parallel_irq[i], parallel_hds[i]);

        }

    }

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

        nd = &nd_table[i];

        if (!nd->model) {

            if (pci_enabled) {

                nd->model = "ne2k_pci";

            } else {

                nd->model = "ne2k_isa";

            }

        }

        if (strcmp(nd->model, "ne2k_isa") == 0) {

            pc_init_ne2k_isa(nd);

        } else if (pci_enabled) {

            pci_nic_init(pci_bus, nd);

        } else {

            fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd->model);

            exit(1);

        }

    }

    if (pci_enabled) {

        pci_piix3_ide_init(pci_bus, bs_table, piix3_devfn + 1);

    } else {

        for(i = 0; i < 2; i++) {

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

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

        }

    }

    kbd_init();

    DMA_init(0);

#ifdef HAS_AUDIO

    audio_init(pci_enabled ? pci_bus : NULL);

#endif

    floppy_controller = fdctrl_init(6, 2, 0, 0x3f0, fd_table);

    cmos_init(ram_size, boot_device, bs_table);

    if (pci_enabled && usb_enabled) {

        usb_uhci_init(pci_bus, piix3_devfn + 2);

    }

    if (pci_enabled && acpi_enabled) {

        piix4_pm_init(pci_bus, piix3_devfn + 3);

    }

#if 0

    /* ??? Need to figure out some way for the user to

       specify SCSI devices.  */

    if (pci_enabled) {

        void *scsi;

        BlockDriverState *bdrv;

        scsi = lsi_scsi_init(pci_bus, -1);

        bdrv = bdrv_new("scsidisk");

        bdrv_open(bdrv, "scsi_disk.img", 0);

        lsi_scsi_attach(scsi, bdrv, -1);

        bdrv = bdrv_new("scsicd");

        bdrv_open(bdrv, "scsi_cd.iso", 0);

        bdrv_set_type_hint(bdrv, BDRV_TYPE_CDROM);

        lsi_scsi_attach(scsi, bdrv, -1);

    }

#endif

    /* must be done after all PCI devices are instanciated */

    /* XXX: should be done in the Bochs BIOS */

    if (pci_enabled) {

        pci_bios_init();

        if (acpi_enabled)

            acpi_bios_init();

    }

}

static void pc_init_pci(int ram_size, int vga_ram_size, int boot_device,

                        DisplayState *ds, const char **fd_filename,