vl.c 51.2 KB
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/*
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 * QEMU System Emulator
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 * 
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 * Copyright (c) 2003-2004 Fabrice Bellard
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 * 
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 * 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.
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 */
#include <stdlib.h>
#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include <getopt.h>
#include <inttypes.h>
#include <unistd.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <malloc.h>
#include <termios.h>
#include <sys/poll.h>
#include <errno.h>
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#include <sys/wait.h>
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#include <pty.h>
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#include <sys/times.h>
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#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_tun.h>
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#include "disas.h"
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#include "vl.h"
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#include "exec-all.h"
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#define DEFAULT_NETWORK_SCRIPT "/etc/qemu-ifup"
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//#define DEBUG_UNUSED_IOPORT
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#if !defined(CONFIG_SOFTMMU)
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#define PHYS_RAM_MAX_SIZE (256 * 1024 * 1024)
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#else
#define PHYS_RAM_MAX_SIZE (2047 * 1024 * 1024)
#endif
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/* in ms */
#define GUI_REFRESH_INTERVAL 30
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/* XXX: use a two level table to limit memory usage */
#define MAX_IOPORTS 65536
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const char *bios_dir = CONFIG_QEMU_SHAREDIR;
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char phys_ram_file[1024];
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CPUState *global_env;
CPUState *cpu_single_env;
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void *ioport_opaque[MAX_IOPORTS];
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IOPortReadFunc *ioport_read_table[3][MAX_IOPORTS];
IOPortWriteFunc *ioport_write_table[3][MAX_IOPORTS];
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BlockDriverState *bs_table[MAX_DISKS], *fd_table[MAX_FD];
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int vga_ram_size;
static DisplayState display_state;
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int nographic;
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int64_t ticks_per_sec;
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int boot_device = 'c';
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static int ram_size;
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static char network_script[1024];
int pit_min_timer_count = 0;
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int nb_nics;
NetDriverState nd_table[MAX_NICS];
SerialState *serial_console;
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QEMUTimer *gui_timer;
int vm_running;
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/***********************************************************/
/* x86 io ports */

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uint32_t default_ioport_readb(void *opaque, uint32_t address)
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{
#ifdef DEBUG_UNUSED_IOPORT
    fprintf(stderr, "inb: port=0x%04x\n", address);
#endif
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    return 0xff;
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}

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void default_ioport_writeb(void *opaque, uint32_t address, uint32_t data)
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{
#ifdef DEBUG_UNUSED_IOPORT
    fprintf(stderr, "outb: port=0x%04x data=0x%02x\n", address, data);
#endif
}

/* default is to make two byte accesses */
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uint32_t default_ioport_readw(void *opaque, uint32_t address)
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{
    uint32_t data;
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    data = ioport_read_table[0][address & (MAX_IOPORTS - 1)](opaque, address);
    data |= ioport_read_table[0][(address + 1) & (MAX_IOPORTS - 1)](opaque, address + 1) << 8;
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    return data;
}

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void default_ioport_writew(void *opaque, uint32_t address, uint32_t data)
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{
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    ioport_write_table[0][address & (MAX_IOPORTS - 1)](opaque, address, data & 0xff);
    ioport_write_table[0][(address + 1) & (MAX_IOPORTS - 1)](opaque, address + 1, (data >> 8) & 0xff);
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}

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uint32_t default_ioport_readl(void *opaque, uint32_t address)
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{
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#ifdef DEBUG_UNUSED_IOPORT
    fprintf(stderr, "inl: port=0x%04x\n", address);
#endif
    return 0xffffffff;
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}

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void default_ioport_writel(void *opaque, uint32_t address, uint32_t data)
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{
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#ifdef DEBUG_UNUSED_IOPORT
    fprintf(stderr, "outl: port=0x%04x data=0x%02x\n", address, data);
#endif
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}

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void init_ioports(void)
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{
    int i;

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    for(i = 0; i < MAX_IOPORTS; i++) {
        ioport_read_table[0][i] = default_ioport_readb;
        ioport_write_table[0][i] = default_ioport_writeb;
        ioport_read_table[1][i] = default_ioport_readw;
        ioport_write_table[1][i] = default_ioport_writew;
        ioport_read_table[2][i] = default_ioport_readl;
        ioport_write_table[2][i] = default_ioport_writel;
    }
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}

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/* size is the word size in byte */
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int register_ioport_read(int start, int length, int size, 
                         IOPortReadFunc *func, void *opaque)
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{
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    int i, bsize;
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    if (size == 1) {
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        bsize = 0;
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    } else if (size == 2) {
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        bsize = 1;
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    } else if (size == 4) {
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        bsize = 2;
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    } else {
        hw_error("register_ioport_read: invalid size");
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        return -1;
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    }
    for(i = start; i < start + length; i += size) {
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        ioport_read_table[bsize][i] = func;
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        if (ioport_opaque[i] != NULL && ioport_opaque[i] != opaque)
            hw_error("register_ioport_read: invalid opaque");
        ioport_opaque[i] = opaque;
    }
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    return 0;
}

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/* size is the word size in byte */
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int register_ioport_write(int start, int length, int size, 
                          IOPortWriteFunc *func, void *opaque)
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{
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    int i, bsize;
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    if (size == 1) {
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        bsize = 0;
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    } else if (size == 2) {
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        bsize = 1;
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    } else if (size == 4) {
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        bsize = 2;
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    } else {
        hw_error("register_ioport_write: invalid size");
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        return -1;
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    }
    for(i = start; i < start + length; i += size) {
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        ioport_write_table[bsize][i] = func;
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        if (ioport_opaque[i] != NULL && ioport_opaque[i] != opaque)
            hw_error("register_ioport_read: invalid opaque");
        ioport_opaque[i] = opaque;
    }
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    return 0;
}

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void pstrcpy(char *buf, int buf_size, const char *str)
{
    int c;
    char *q = buf;

    if (buf_size <= 0)
        return;

    for(;;) {
        c = *str++;
        if (c == 0 || q >= buf + buf_size - 1)
            break;
        *q++ = c;
    }
    *q = '\0';
}

/* strcat and truncate. */
char *pstrcat(char *buf, int buf_size, const char *s)
{
    int len;
    len = strlen(buf);
    if (len < buf_size) 
        pstrcpy(buf + len, buf_size - len, s);
    return buf;
}

/* return the size or -1 if error */
int load_image(const char *filename, uint8_t *addr)
{
    int fd, size;
    fd = open(filename, O_RDONLY);
    if (fd < 0)
        return -1;
    size = lseek(fd, 0, SEEK_END);
    lseek(fd, 0, SEEK_SET);
    if (read(fd, addr, size) != size) {
        close(fd);
        return -1;
    }
    close(fd);
    return size;
}

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void cpu_outb(CPUState *env, int addr, int val)
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{
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    addr &= (MAX_IOPORTS - 1);
    ioport_write_table[0][addr](ioport_opaque[addr], addr, val);
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}

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void cpu_outw(CPUState *env, int addr, int val)
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{
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    addr &= (MAX_IOPORTS - 1);
    ioport_write_table[1][addr](ioport_opaque[addr], addr, val);
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}

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void cpu_outl(CPUState *env, int addr, int val)
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{
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    addr &= (MAX_IOPORTS - 1);
    ioport_write_table[2][addr](ioport_opaque[addr], addr, val);
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}

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int cpu_inb(CPUState *env, int addr)
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{
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    addr &= (MAX_IOPORTS - 1);
    return ioport_read_table[0][addr](ioport_opaque[addr], addr);
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}

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int cpu_inw(CPUState *env, int addr)
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{
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    addr &= (MAX_IOPORTS - 1);
    return ioport_read_table[1][addr](ioport_opaque[addr], addr);
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}

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int cpu_inl(CPUState *env, int addr)
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{
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    addr &= (MAX_IOPORTS - 1);
    return ioport_read_table[2][addr](ioport_opaque[addr], addr);
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}

/***********************************************************/
void hw_error(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    fprintf(stderr, "qemu: hardware error: ");
    vfprintf(stderr, fmt, ap);
    fprintf(stderr, "\n");
#ifdef TARGET_I386
    cpu_x86_dump_state(global_env, stderr, X86_DUMP_FPU | X86_DUMP_CCOP);
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#else
    cpu_dump_state(global_env, stderr, 0);
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#endif
    va_end(ap);
    abort();
}

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/***********************************************************/
/* timers */

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#if defined(__powerpc__)

static inline uint32_t get_tbl(void) 
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{
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    uint32_t tbl;
    asm volatile("mftb %0" : "=r" (tbl));
    return tbl;
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}

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static inline uint32_t get_tbu(void) 
{
	uint32_t tbl;
	asm volatile("mftbu %0" : "=r" (tbl));
	return tbl;
}

int64_t cpu_get_real_ticks(void)
{
    uint32_t l, h, h1;
    /* NOTE: we test if wrapping has occurred */
    do {
        h = get_tbu();
        l = get_tbl();
        h1 = get_tbu();
    } while (h != h1);
    return ((int64_t)h << 32) | l;
}

#elif defined(__i386__)

int64_t cpu_get_real_ticks(void)
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{
    int64_t val;
    asm("rdtsc" : "=A" (val));
    return val;
}

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#else
#error unsupported CPU
#endif

static int64_t cpu_ticks_offset;
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static int cpu_ticks_enabled;
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static inline int64_t cpu_get_ticks(void)
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{
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    if (!cpu_ticks_enabled) {
        return cpu_ticks_offset;
    } else {
        return cpu_get_real_ticks() + cpu_ticks_offset;
    }
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}

/* enable cpu_get_ticks() */
void cpu_enable_ticks(void)
{
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    if (!cpu_ticks_enabled) {
        cpu_ticks_offset -= cpu_get_real_ticks();
        cpu_ticks_enabled = 1;
    }
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}

/* disable cpu_get_ticks() : the clock is stopped. You must not call
   cpu_get_ticks() after that.  */
void cpu_disable_ticks(void)
{
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    if (cpu_ticks_enabled) {
        cpu_ticks_offset = cpu_get_ticks();
        cpu_ticks_enabled = 0;
    }
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}

int64_t get_clock(void)
{
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return tv.tv_sec * 1000000LL + tv.tv_usec;
}

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void cpu_calibrate_ticks(void)
{
    int64_t usec, ticks;

    usec = get_clock();
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    ticks = cpu_get_real_ticks();
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    usleep(50 * 1000);
    usec = get_clock() - usec;
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    ticks = cpu_get_real_ticks() - ticks;
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    ticks_per_sec = (ticks * 1000000LL + (usec >> 1)) / usec;
}

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/* compute with 96 bit intermediate result: (a*b)/c */
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uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
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{
    union {
        uint64_t ll;
        struct {
#ifdef WORDS_BIGENDIAN
            uint32_t high, low;
#else
            uint32_t low, high;
#endif            
        } l;
    } u, res;
    uint64_t rl, rh;

    u.ll = a;
    rl = (uint64_t)u.l.low * (uint64_t)b;
    rh = (uint64_t)u.l.high * (uint64_t)b;
    rh += (rl >> 32);
    res.l.high = rh / c;
    res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
    return res.ll;
}

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#define QEMU_TIMER_REALTIME 0
#define QEMU_TIMER_VIRTUAL  1

struct QEMUClock {
    int type;
    /* XXX: add frequency */
};

struct QEMUTimer {
    QEMUClock *clock;
    int64_t expire_time;
    QEMUTimerCB *cb;
    void *opaque;
    struct QEMUTimer *next;
};

QEMUClock *rt_clock;
QEMUClock *vm_clock;

static QEMUTimer *active_timers[2];
/* frequency of the times() clock tick */
static int timer_freq;

QEMUClock *qemu_new_clock(int type)
{
    QEMUClock *clock;
    clock = qemu_mallocz(sizeof(QEMUClock));
    if (!clock)
        return NULL;
    clock->type = type;
    return clock;
}

QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque)
{
    QEMUTimer *ts;

    ts = qemu_mallocz(sizeof(QEMUTimer));
    ts->clock = clock;
    ts->cb = cb;
    ts->opaque = opaque;
    return ts;
}

void qemu_free_timer(QEMUTimer *ts)
{
    qemu_free(ts);
}

/* stop a timer, but do not dealloc it */
void qemu_del_timer(QEMUTimer *ts)
{
    QEMUTimer **pt, *t;

    /* NOTE: this code must be signal safe because
       qemu_timer_expired() can be called from a signal. */
    pt = &active_timers[ts->clock->type];
    for(;;) {
        t = *pt;
        if (!t)
            break;
        if (t == ts) {
            *pt = t->next;
            break;
        }
        pt = &t->next;
    }
}

/* modify the current timer so that it will be fired when current_time
   >= expire_time. The corresponding callback will be called. */
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
{
    QEMUTimer **pt, *t;

    qemu_del_timer(ts);

    /* add the timer in the sorted list */
    /* NOTE: this code must be signal safe because
       qemu_timer_expired() can be called from a signal. */
    pt = &active_timers[ts->clock->type];
    for(;;) {
        t = *pt;
        if (!t)
            break;
        if (t->expire_time > expire_time) 
            break;
        pt = &t->next;
    }
    ts->expire_time = expire_time;
    ts->next = *pt;
    *pt = ts;
}

int qemu_timer_pending(QEMUTimer *ts)
{
    QEMUTimer *t;
    for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) {
        if (t == ts)
            return 1;
    }
    return 0;
}

static inline int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
{
    if (!timer_head)
        return 0;
    return (timer_head->expire_time <= current_time);
}

static void qemu_run_timers(QEMUTimer **ptimer_head, int64_t current_time)
{
    QEMUTimer *ts;
    
    for(;;) {
        ts = *ptimer_head;
        if (ts->expire_time > current_time)
            break;
        /* remove timer from the list before calling the callback */
        *ptimer_head = ts->next;
        ts->next = NULL;
        
        /* run the callback (the timer list can be modified) */
        ts->cb(ts->opaque);
    }
}

int64_t qemu_get_clock(QEMUClock *clock)
{
    switch(clock->type) {
    case QEMU_TIMER_REALTIME:
        /* XXX: portability among Linux hosts */
        if (timer_freq == 100) {
            return times(NULL) * 10;
        } else {
            return ((int64_t)times(NULL) * 1000) / timer_freq;
        }
    default:
    case QEMU_TIMER_VIRTUAL:
        return cpu_get_ticks();
    }
}

/* save a timer */
void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
{
    uint64_t expire_time;

    if (qemu_timer_pending(ts)) {
        expire_time = ts->expire_time;
    } else {
        expire_time = -1;
    }
    qemu_put_be64(f, expire_time);
}

void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
{
    uint64_t expire_time;

    expire_time = qemu_get_be64(f);
    if (expire_time != -1) {
        qemu_mod_timer(ts, expire_time);
    } else {
        qemu_del_timer(ts);
    }
}

static void timer_save(QEMUFile *f, void *opaque)
{
    if (cpu_ticks_enabled) {
        hw_error("cannot save state if virtual timers are running");
    }
    qemu_put_be64s(f, &cpu_ticks_offset);
    qemu_put_be64s(f, &ticks_per_sec);
}

static int timer_load(QEMUFile *f, void *opaque, int version_id)
{
    if (version_id != 1)
        return -EINVAL;
    if (cpu_ticks_enabled) {
        return -EINVAL;
    }
    qemu_get_be64s(f, &cpu_ticks_offset);
    qemu_get_be64s(f, &ticks_per_sec);
    return 0;
}

static void host_alarm_handler(int host_signum)
{
    if (qemu_timer_expired(active_timers[QEMU_TIMER_VIRTUAL],
                           qemu_get_clock(vm_clock)) ||
        qemu_timer_expired(active_timers[QEMU_TIMER_REALTIME],
                           qemu_get_clock(rt_clock))) {
        /* stop the cpu because a timer occured */
        cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
    }
}

static void init_timers(void)
{
    struct sigaction act;
    struct itimerval itv;

    /* get times() syscall frequency */
    timer_freq = sysconf(_SC_CLK_TCK);

    rt_clock = qemu_new_clock(QEMU_TIMER_REALTIME);
    vm_clock = qemu_new_clock(QEMU_TIMER_VIRTUAL);

    /* timer signal */
    sigfillset(&act.sa_mask);
    act.sa_flags = 0;
#if defined (TARGET_I386) && defined(USE_CODE_COPY)
    act.sa_flags |= SA_ONSTACK;
#endif
    act.sa_handler = host_alarm_handler;
    sigaction(SIGALRM, &act, NULL);

    itv.it_interval.tv_sec = 0;
    itv.it_interval.tv_usec = 1000;
    itv.it_value.tv_sec = 0;
    itv.it_value.tv_usec = 10 * 1000;
    setitimer(ITIMER_REAL, &itv, NULL);
    /* we probe the tick duration of the kernel to inform the user if
       the emulated kernel requested a too high timer frequency */
    getitimer(ITIMER_REAL, &itv);
    pit_min_timer_count = ((uint64_t)itv.it_interval.tv_usec * PIT_FREQ) / 
        1000000;
}

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/***********************************************************/
/* serial device */
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int serial_open_device(void)
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{
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    char slave_name[1024];
    int master_fd, slave_fd;
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    if (serial_console == NULL && nographic) {
        /* use console for serial port */
        return 0;
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    } else {
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        if (openpty(&master_fd, &slave_fd, slave_name, NULL, NULL) < 0) {
            fprintf(stderr, "warning: could not create pseudo terminal for serial port\n");
            return -1;
        }
        fprintf(stderr, "Serial port redirected to %s\n", slave_name);
        return master_fd;
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    }
}

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/***********************************************************/
/* Linux network device redirector */
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static int tun_open(char *ifname, int ifname_size)
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{
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    struct ifreq ifr;
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    int fd, ret;
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    fd = open("/dev/net/tun", O_RDWR);
    if (fd < 0) {
        fprintf(stderr, "warning: could not open /dev/net/tun: no virtual network emulation\n");
        return -1;
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    }
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    memset(&ifr, 0, sizeof(ifr));
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
    pstrcpy(ifr.ifr_name, IFNAMSIZ, "tun%d");
    ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
    if (ret != 0) {
        fprintf(stderr, "warning: could not configure /dev/net/tun: no virtual network emulation\n");
        close(fd);
        return -1;
    }
    printf("Connected to host network interface: %s\n", ifr.ifr_name);
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    pstrcpy(ifname, ifname_size, ifr.ifr_name);
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    fcntl(fd, F_SETFL, O_NONBLOCK);
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    return fd;
}
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static int net_init(void)
{
    int pid, status, launch_script, i;
    NetDriverState *nd;
    char *args[MAX_NICS + 2];
    char **parg;

    launch_script = 0;
    for(i = 0; i < nb_nics; i++) {
        nd = &nd_table[i];
        if (nd->fd < 0) {
            nd->fd = tun_open(nd->ifname, sizeof(nd->ifname));
            if (nd->fd >= 0) 
                launch_script = 1;
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        }
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    }

    if (launch_script) {
        /* try to launch network init script */
        pid = fork();
        if (pid >= 0) {
            if (pid == 0) {
                parg = args;
                *parg++ = network_script;
                for(i = 0; i < nb_nics; i++) {
                    nd = &nd_table[i];
                    if (nd->fd >= 0) {
                        *parg++ = nd->ifname;
                    }
                }
                *parg++ = NULL;
                execv(network_script, args);
                exit(1);
            }
            while (waitpid(pid, &status, 0) != pid);
            if (!WIFEXITED(status) ||
                WEXITSTATUS(status) != 0) {
                fprintf(stderr, "%s: could not launch network script\n",
                        network_script);
            }
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        }
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    }
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    return 0;
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}

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void net_send_packet(NetDriverState *nd, const uint8_t *buf, int size)
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{
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#ifdef DEBUG_NE2000
    printf("NE2000: sending packet size=%d\n", size);
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#endif
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    write(nd->fd, buf, size);
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}
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/***********************************************************/
/* dumb display */

/* init terminal so that we can grab keys */
static struct termios oldtty;

static void term_exit(void)
{
    tcsetattr (0, TCSANOW, &oldtty);
}

static void term_init(void)
{
    struct termios tty;

    tcgetattr (0, &tty);
    oldtty = tty;

    tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
                          |INLCR|IGNCR|ICRNL|IXON);
    tty.c_oflag |= OPOST;
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    tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
    /* if graphical mode, we allow Ctrl-C handling */
    if (nographic)
        tty.c_lflag &= ~ISIG;
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    tty.c_cflag &= ~(CSIZE|PARENB);
    tty.c_cflag |= CS8;
    tty.c_cc[VMIN] = 1;
    tty.c_cc[VTIME] = 0;
    
    tcsetattr (0, TCSANOW, &tty);

    atexit(term_exit);

    fcntl(0, F_SETFL, O_NONBLOCK);
}

static void dumb_update(DisplayState *ds, int x, int y, int w, int h)
{
}

static void dumb_resize(DisplayState *ds, int w, int h)
{
}

static void dumb_refresh(DisplayState *ds)
{
    vga_update_display();
}

void dumb_display_init(DisplayState *ds)
{
    ds->data = NULL;
    ds->linesize = 0;
    ds->depth = 0;
    ds->dpy_update = dumb_update;
    ds->dpy_resize = dumb_resize;
    ds->dpy_refresh = dumb_refresh;
}

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#if !defined(CONFIG_SOFTMMU)
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/***********************************************************/
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/* cpu signal handler */
static void host_segv_handler(int host_signum, siginfo_t *info, 
                              void *puc)
{
    if (cpu_signal_handler(host_signum, info, puc))
        return;
    term_exit();
    abort();
}
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#endif
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/***********************************************************/
/* I/O handling */
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#define MAX_IO_HANDLERS 64

typedef struct IOHandlerRecord {
    int fd;
    IOCanRWHandler *fd_can_read;
    IOReadHandler *fd_read;
    void *opaque;
    /* temporary data */
    struct pollfd *ufd;
    int max_size;
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    struct IOHandlerRecord *next;
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} IOHandlerRecord;

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static IOHandlerRecord *first_io_handler;
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int qemu_add_fd_read_handler(int fd, IOCanRWHandler *fd_can_read, 
                             IOReadHandler *fd_read, void *opaque)
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{
    IOHandlerRecord *ioh;

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    ioh = qemu_mallocz(sizeof(IOHandlerRecord));
    if (!ioh)
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        return -1;
    ioh->fd = fd;
    ioh->fd_can_read = fd_can_read;
    ioh->fd_read = fd_read;
    ioh->opaque = opaque;
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    ioh->next = first_io_handler;
    first_io_handler = ioh;
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    return 0;
}

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void qemu_del_fd_read_handler(int fd)
{
    IOHandlerRecord **pioh, *ioh;
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    pioh = &first_io_handler;
    for(;;) {
        ioh = *pioh;
        if (ioh == NULL)
            break;
        if (ioh->fd == fd) {
            *pioh = ioh->next;
            break;
        }
        pioh = &ioh->next;
    }
}

/***********************************************************/
/* savevm/loadvm support */

void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
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{
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    fwrite(buf, 1, size, f);
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}

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void qemu_put_byte(QEMUFile *f, int v)
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{
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    fputc(v, f);
}

void qemu_put_be16(QEMUFile *f, unsigned int v)
{
    qemu_put_byte(f, v >> 8);
    qemu_put_byte(f, v);
}

void qemu_put_be32(QEMUFile *f, unsigned int v)
{
    qemu_put_byte(f, v >> 24);
    qemu_put_byte(f, v >> 16);
    qemu_put_byte(f, v >> 8);
    qemu_put_byte(f, v);
}

void qemu_put_be64(QEMUFile *f, uint64_t v)
{
    qemu_put_be32(f, v >> 32);
    qemu_put_be32(f, v);
}

int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
{
    return fread(buf, 1, size, f);
}

int qemu_get_byte(QEMUFile *f)
{
    int v;
    v = fgetc(f);
    if (v == EOF)
        return 0;
    else
        return v;
}

unsigned int qemu_get_be16(QEMUFile *f)
{
    unsigned int v;
    v = qemu_get_byte(f) << 8;
    v |= qemu_get_byte(f);
    return v;
}

unsigned int qemu_get_be32(QEMUFile *f)
{
    unsigned int v;
    v = qemu_get_byte(f) << 24;
    v |= qemu_get_byte(f) << 16;
    v |= qemu_get_byte(f) << 8;
    v |= qemu_get_byte(f);
    return v;
}

uint64_t qemu_get_be64(QEMUFile *f)
{
    uint64_t v;
    v = (uint64_t)qemu_get_be32(f) << 32;
    v |= qemu_get_be32(f);
    return v;
}

int64_t qemu_ftell(QEMUFile *f)
{
    return ftell(f);
}

int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
{
    if (fseek(f, pos, whence) < 0)
        return -1;
    return ftell(f);
}

typedef struct SaveStateEntry {
    char idstr[256];
    int instance_id;
    int version_id;
    SaveStateHandler *save_state;
    LoadStateHandler *load_state;
    void *opaque;
    struct SaveStateEntry *next;
} SaveStateEntry;
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static SaveStateEntry *first_se;

int register_savevm(const char *idstr, 
                    int instance_id, 
                    int version_id,
                    SaveStateHandler *save_state,
                    LoadStateHandler *load_state,
                    void *opaque)
{
    SaveStateEntry *se, **pse;

    se = qemu_malloc(sizeof(SaveStateEntry));
    if (!se)
        return -1;
    pstrcpy(se->idstr, sizeof(se->idstr), idstr);
    se->instance_id = instance_id;
    se->version_id = version_id;
    se->save_state = save_state;
    se->load_state = load_state;
    se->opaque = opaque;
    se->next = NULL;

    /* add at the end of list */
    pse = &first_se;
    while (*pse != NULL)
        pse = &(*pse)->next;
    *pse = se;
    return 0;
}

#define QEMU_VM_FILE_MAGIC   0x5145564d
#define QEMU_VM_FILE_VERSION 0x00000001

int qemu_savevm(const char *filename)
{
    SaveStateEntry *se;
    QEMUFile *f;
    int len, len_pos, cur_pos, saved_vm_running, ret;

    saved_vm_running = vm_running;
    vm_stop(0);

    f = fopen(filename, "wb");
    if (!f) {
        ret = -1;
        goto the_end;
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    }

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    qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
    qemu_put_be32(f, QEMU_VM_FILE_VERSION);

    for(se = first_se; se != NULL; se = se->next) {
        /* ID string */
        len = strlen(se->idstr);
        qemu_put_byte(f, len);
        qemu_put_buffer(f, se->idstr, len);

        qemu_put_be32(f, se->instance_id);
        qemu_put_be32(f, se->version_id);

        /* record size: filled later */
        len_pos = ftell(f);
        qemu_put_be32(f, 0);
        
        se->save_state(f, se->opaque);

        /* fill record size */
        cur_pos = ftell(f);
        len = ftell(f) - len_pos - 4;
        fseek(f, len_pos, SEEK_SET);
        qemu_put_be32(f, len);
        fseek(f, cur_pos, SEEK_SET);
    }

    fclose(f);
    ret = 0;
 the_end:
    if (saved_vm_running)
        vm_start();
    return ret;
}

static SaveStateEntry *find_se(const char *idstr, int instance_id)
{
    SaveStateEntry *se;

    for(se = first_se; se != NULL; se = se->next) {
        if (!strcmp(se->idstr, idstr) && 
            instance_id == se->instance_id)
            return se;
    }
    return NULL;
}

int qemu_loadvm(const char *filename)
{
    SaveStateEntry *se;
    QEMUFile *f;
    int len, cur_pos, ret, instance_id, record_len, version_id;
    int saved_vm_running;
    unsigned int v;
    char idstr[256];
    
    saved_vm_running = vm_running;
    vm_stop(0);

    f = fopen(filename, "rb");
    if (!f) {
        ret = -1;
        goto the_end;
    }

    v = qemu_get_be32(f);
    if (v != QEMU_VM_FILE_MAGIC)
        goto fail;
    v = qemu_get_be32(f);
    if (v != QEMU_VM_FILE_VERSION) {
    fail:
        fclose(f);
        ret = -1;
        goto the_end;
    }
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    for(;;) {
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        len = qemu_get_byte(f);
        if (feof(f))
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            break;
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        qemu_get_buffer(f, idstr, len);
        idstr[len] = '\0';
        instance_id = qemu_get_be32(f);
        version_id = qemu_get_be32(f);
        record_len = qemu_get_be32(f);
#if 0
        printf("idstr=%s instance=0x%x version=%d len=%d\n", 
               idstr, instance_id, version_id, record_len);
#endif
        cur_pos = ftell(f);
        se = find_se(idstr, instance_id);
        if (!se) {
            fprintf(stderr, "qemu: warning: instance 0x%x of device '%s' not present in current VM\n", 
                    instance_id, idstr);
        } else {
            ret = se->load_state(f, se->opaque, version_id);
            if (ret < 0) {
                fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n", 
                        instance_id, idstr);
            }
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        }
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        /* always seek to exact end of record */
        qemu_fseek(f, cur_pos + record_len, SEEK_SET);
    }
    fclose(f);
    ret = 0;
 the_end:
    if (saved_vm_running)
        vm_start();
    return ret;
}

/***********************************************************/
/* cpu save/restore */

#if defined(TARGET_I386)

static void cpu_put_seg(QEMUFile *f, SegmentCache *dt)
{
    qemu_put_be32(f, (uint32_t)dt->base);
    qemu_put_be32(f, dt->limit);
    qemu_put_be32(f, dt->flags);
}

static void cpu_get_seg(QEMUFile *f, SegmentCache *dt)
{
    dt->base = (uint8_t *)qemu_get_be32(f);
    dt->limit = qemu_get_be32(f);
    dt->flags = qemu_get_be32(f);
}

void cpu_save(QEMUFile *f, void *opaque)
{
    CPUState *env = opaque;
    uint16_t fptag, fpus, fpuc;
    uint32_t hflags;
    int i;

    for(i = 0; i < 8; i++)
        qemu_put_be32s(f, &env->regs[i]);
    qemu_put_be32s(f, &env->eip);
    qemu_put_be32s(f, &env->eflags);
    qemu_put_be32s(f, &env->eflags);
    hflags = env->hflags; /* XXX: suppress most of the redundant hflags */
    qemu_put_be32s(f, &hflags);
    
    /* FPU */
    fpuc = env->fpuc;
    fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
    fptag = 0;
    for (i=7; i>=0; i--) {
	fptag <<= 2;
	if (env->fptags[i]) {
            fptag |= 3;
        }
    }
    
    qemu_put_be16s(f, &fpuc);
    qemu_put_be16s(f, &fpus);
    qemu_put_be16s(f, &fptag);

    for(i = 0; i < 8; i++) {
        uint64_t mant;
        uint16_t exp;
        cpu_get_fp80(&mant, &exp, env->fpregs[i]);
        qemu_put_be64(f, mant);
        qemu_put_be16(f, exp);
    }

    for(i = 0; i < 6; i++)
        cpu_put_seg(f, &env->segs[i]);
    cpu_put_seg(f, &env->ldt);
    cpu_put_seg(f, &env->tr);
    cpu_put_seg(f, &env->gdt);
    cpu_put_seg(f, &env->idt);
    
    qemu_put_be32s(f, &env->sysenter_cs);
    qemu_put_be32s(f, &env->sysenter_esp);
    qemu_put_be32s(f, &env->sysenter_eip);
    
    qemu_put_be32s(f, &env->cr[0]);
    qemu_put_be32s(f, &env->cr[2]);
    qemu_put_be32s(f, &env->cr[3]);
    qemu_put_be32s(f, &env->cr[4]);
    
    for(i = 0; i < 8; i++)
        qemu_put_be32s(f, &env->dr[i]);

    /* MMU */
    qemu_put_be32s(f, &env->a20_mask);
}

int cpu_load(QEMUFile *f, void *opaque, int version_id)
{
    CPUState *env = opaque;
    int i;
    uint32_t hflags;
    uint16_t fpus, fpuc, fptag;

    if (version_id != 1)
        return -EINVAL;
    for(i = 0; i < 8; i++)
        qemu_get_be32s(f, &env->regs[i]);
    qemu_get_be32s(f, &env->eip);
    qemu_get_be32s(f, &env->eflags);
    qemu_get_be32s(f, &env->eflags);
    qemu_get_be32s(f, &hflags);

    qemu_get_be16s(f, &fpuc);
    qemu_get_be16s(f, &fpus);
    qemu_get_be16s(f, &fptag);

    for(i = 0; i < 8; i++) {
        uint64_t mant;
        uint16_t exp;
        mant = qemu_get_be64(f);
        exp = qemu_get_be16(f);
        env->fpregs[i] = cpu_set_fp80(mant, exp);
    }

    env->fpuc = fpuc;
    env->fpstt = (fpus >> 11) & 7;
    env->fpus = fpus & ~0x3800;
    for(i = 0; i < 8; i++) {
        env->fptags[i] = ((fptag & 3) == 3);
        fptag >>= 2;
    }
    
    for(i = 0; i < 6; i++)
        cpu_get_seg(f, &env->segs[i]);
    cpu_get_seg(f, &env->ldt);
    cpu_get_seg(f, &env->tr);
    cpu_get_seg(f, &env->gdt);
    cpu_get_seg(f, &env->idt);
    
    qemu_get_be32s(f, &env->sysenter_cs);
    qemu_get_be32s(f, &env->sysenter_esp);
    qemu_get_be32s(f, &env->sysenter_eip);
    
    qemu_get_be32s(f, &env->cr[0]);
    qemu_get_be32s(f, &env->cr[2]);
    qemu_get_be32s(f, &env->cr[3]);
    qemu_get_be32s(f, &env->cr[4]);
    
    for(i = 0; i < 8; i++)
        qemu_get_be32s(f, &env->dr[i]);

    /* MMU */
    qemu_get_be32s(f, &env->a20_mask);

    /* XXX: compute hflags from scratch, except for CPL and IIF */
    env->hflags = hflags;
    tlb_flush(env, 1);
    return 0;
}

#else

#warning No CPU save/restore functions

#endif

/***********************************************************/
/* ram save/restore */

/* we just avoid storing empty pages */
static void ram_put_page(QEMUFile *f, const uint8_t *buf, int len)
{
    int i, v;

    v = buf[0];
    for(i = 1; i < len; i++) {
        if (buf[i] != v)
            goto normal_save;
    }
    qemu_put_byte(f, 1);
    qemu_put_byte(f, v);
    return;
 normal_save:
    qemu_put_byte(f, 0); 
    qemu_put_buffer(f, buf, len);
}

static int ram_get_page(QEMUFile *f, uint8_t *buf, int len)
{
    int v;

    v = qemu_get_byte(f);
    switch(v) {
    case 0:
        if (qemu_get_buffer(f, buf, len) != len)
            return -EIO;
        break;
    case 1:
        v = qemu_get_byte(f);
        memset(buf, v, len);
        break;
    default:
        return -EINVAL;
    }
    return 0;
}

static void ram_save(QEMUFile *f, void *opaque)
{
    int i;
    qemu_put_be32(f, phys_ram_size);
    for(i = 0; i < phys_ram_size; i+= TARGET_PAGE_SIZE) {
        ram_put_page(f, phys_ram_base + i, TARGET_PAGE_SIZE);
    }
}

static int ram_load(QEMUFile *f, void *opaque, int version_id)
{
    int i, ret;

    if (version_id != 1)
        return -EINVAL;
    if (qemu_get_be32(f) != phys_ram_size)
        return -EINVAL;
    for(i = 0; i < phys_ram_size; i+= TARGET_PAGE_SIZE) {
        ret = ram_get_page(f, phys_ram_base + i, TARGET_PAGE_SIZE);
        if (ret)
            return ret;
    }
    return 0;
}

/***********************************************************/
/* main execution loop */

void gui_update(void *opaque)
{
    display_state.dpy_refresh(&display_state);
    qemu_mod_timer(gui_timer, GUI_REFRESH_INTERVAL + qemu_get_clock(rt_clock));
}

/* XXX: support several handlers */
VMStopHandler *vm_stop_cb;
VMStopHandler *vm_stop_opaque;

int qemu_add_vm_stop_handler(VMStopHandler *cb, void *opaque)
{
    vm_stop_cb = cb;
    vm_stop_opaque = opaque;
    return 0;
}

void qemu_del_vm_stop_handler(VMStopHandler *cb, void *opaque)
{
    vm_stop_cb = NULL;
}

void vm_start(void)
{
    if (!vm_running) {
        cpu_enable_ticks();
        vm_running = 1;
    }
}

void vm_stop(int reason) 
{
    if (vm_running) {
        cpu_disable_ticks();
        vm_running = 0;
        if (reason != 0) {
            if (vm_stop_cb) {
                vm_stop_cb(vm_stop_opaque, reason);
            }
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        }
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    }
}

int main_loop(void)
{
    struct pollfd ufds[MAX_IO_HANDLERS + 1], *pf;
    int ret, n, timeout, max_size;
    uint8_t buf[4096];
    IOHandlerRecord *ioh, *ioh_next;
    CPUState *env = global_env;

    for(;;) {
        if (vm_running) {
            ret = cpu_exec(env);
            if (reset_requested) {
                ret = EXCP_INTERRUPT; 
                break;
            }
            if (ret == EXCP_DEBUG) {
                vm_stop(EXCP_DEBUG);
            }
            /* if hlt instruction, we wait until the next IRQ */
            /* XXX: use timeout computed from timers */
            if (ret == EXCP_HLT) 
                timeout = 10;
            else
                timeout = 0;
        } else {
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            timeout = 10;
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        }
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        /* poll any events */
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        /* XXX: separate device handlers from system ones */
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        pf = ufds;
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        for(ioh = first_io_handler; ioh != NULL; ioh = ioh->next) {
            if (!ioh->fd_can_read) {
                max_size = 0;
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                pf->fd = ioh->fd;
                pf->events = POLLIN;
                ioh->ufd = pf;
                pf++;
            } else {
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                max_size = ioh->fd_can_read(ioh->opaque);
                if (max_size > 0) {
                    if (max_size > sizeof(buf))
                        max_size = sizeof(buf);
                    pf->fd = ioh->fd;
                    pf->events = POLLIN;
                    ioh->ufd = pf;
                    pf++;
                } else {
                    ioh->ufd = NULL;
                }
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            }