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/*
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 * QEMU System Emulator
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 *
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 * Copyright (c) 2003-2008 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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 */
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#include "hw/hw.h"
#include "hw/boards.h"
#include "hw/usb.h"
#include "hw/pcmcia.h"
#include "hw/pc.h"
#include "hw/audiodev.h"
#include "hw/isa.h"
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#include "hw/baum.h"
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#include "hw/bt.h"
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#include "net.h"
#include "console.h"
#include "sysemu.h"
#include "gdbstub.h"
#include "qemu-timer.h"
#include "qemu-char.h"
#include "block.h"
#include "audio/audio.h"
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#include "migration.h"
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#include "kvm.h"
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#include "balloon.h"
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#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
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#include <sys/time.h>
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#include <zlib.h>
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#ifndef _WIN32
#include <sys/times.h>
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#include <sys/wait.h>
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#include <termios.h>
#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include <sys/resource.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/if.h>
#if defined(__NetBSD__)
#include <net/if_tap.h>
#endif
#ifdef __linux__
#include <linux/if_tun.h>
#endif
#include <arpa/inet.h>
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#include <dirent.h>
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#include <netdb.h>
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#include <sys/select.h>
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#ifdef _BSD
#include <sys/stat.h>
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#ifdef __FreeBSD__
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#include <libutil.h>
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#else
#include <util.h>
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#endif
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#elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
#include <freebsd/stdlib.h>
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#else
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#ifdef __linux__
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#include <pty.h>
#include <malloc.h>
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#include <linux/rtc.h>
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/* For the benefit of older linux systems which don't supply it,
   we use a local copy of hpet.h. */
/* #include <linux/hpet.h> */
#include "hpet.h"

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#include <linux/ppdev.h>
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#include <linux/parport.h>
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#endif
#ifdef __sun__
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#include <sys/stat.h>
#include <sys/ethernet.h>
#include <sys/sockio.h>
#include <netinet/arp.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h> // must come after ip.h
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <net/if.h>
#include <syslog.h>
#include <stropts.h>
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#endif
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#endif
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#endif
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#include "qemu_socket.h"

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#if defined(CONFIG_SLIRP)
#include "libslirp.h"
#endif

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#if defined(__OpenBSD__)
#include <util.h>
#endif

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#if defined(CONFIG_VDE)
#include <libvdeplug.h>
#endif

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#ifdef _WIN32
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#include <malloc.h>
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#include <sys/timeb.h>
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#include <mmsystem.h>
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#define getopt_long_only getopt_long
#define memalign(align, size) malloc(size)
#endif

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#ifdef CONFIG_SDL
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#ifdef __APPLE__
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#include <SDL/SDL.h>
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#endif
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#endif /* CONFIG_SDL */
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#ifdef CONFIG_COCOA
#undef main
#define main qemu_main
#endif /* CONFIG_COCOA */

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#include "disas.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 DEFAULT_NETWORK_DOWN_SCRIPT "/etc/qemu-ifdown"
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#ifdef __sun__
#define SMBD_COMMAND "/usr/sfw/sbin/smbd"
#else
#define SMBD_COMMAND "/usr/sbin/smbd"
#endif
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//#define DEBUG_UNUSED_IOPORT
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//#define DEBUG_IOPORT
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//#define DEBUG_NET
//#define DEBUG_SLIRP
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#ifdef TARGET_PPC
#define DEFAULT_RAM_SIZE 144
#else
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#define DEFAULT_RAM_SIZE 128
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#endif
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/* Max number of USB devices that can be specified on the commandline.  */
#define MAX_USB_CMDLINE 8

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/* Max number of bluetooth switches on the commandline.  */
#define MAX_BT_CMDLINE 10

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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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const char *bios_name = NULL;
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static void *ioport_opaque[MAX_IOPORTS];
static IOPortReadFunc *ioport_read_table[3][MAX_IOPORTS];
static IOPortWriteFunc *ioport_write_table[3][MAX_IOPORTS];
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/* Note: drives_table[MAX_DRIVES] is a dummy block driver if none available
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   to store the VM snapshots */
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DriveInfo drives_table[MAX_DRIVES+1];
int nb_drives;
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static int vga_ram_size;
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enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
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DisplayState display_state;
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int nographic;
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static int curses;
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const char* keyboard_layout = NULL;
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int64_t ticks_per_sec;
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ram_addr_t ram_size;
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int nb_nics;
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NICInfo nd_table[MAX_NICS];
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int vm_running;
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static int rtc_utc = 1;
static int rtc_date_offset = -1; /* -1 means no change */
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int cirrus_vga_enabled = 1;
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int vmsvga_enabled = 0;
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#ifdef TARGET_SPARC
int graphic_width = 1024;
int graphic_height = 768;
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int graphic_depth = 8;
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#else
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int graphic_width = 800;
int graphic_height = 600;
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int graphic_depth = 15;
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#endif
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static int full_screen = 0;
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#ifdef CONFIG_SDL
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static int no_frame = 0;
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#endif
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int no_quit = 0;
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CharDriverState *serial_hds[MAX_SERIAL_PORTS];
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CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
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#ifdef TARGET_I386
int win2k_install_hack = 0;
#endif
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int usb_enabled = 0;
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int smp_cpus = 1;
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const char *vnc_display;
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int acpi_enabled = 1;
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int fd_bootchk = 1;
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int no_reboot = 0;
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int no_shutdown = 0;
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int cursor_hide = 1;
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int graphic_rotate = 0;
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int daemonize = 0;
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const char *option_rom[MAX_OPTION_ROMS];
int nb_option_roms;
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int semihosting_enabled = 0;
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#ifdef TARGET_ARM
int old_param = 0;
#endif
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const char *qemu_name;
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int alt_grab = 0;
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#ifdef TARGET_SPARC
unsigned int nb_prom_envs = 0;
const char *prom_envs[MAX_PROM_ENVS];
#endif
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static int nb_drives_opt;
static struct drive_opt {
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    const char *file;
    char opt[1024];
} drives_opt[MAX_DRIVES];
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static CPUState *cur_cpu;
static CPUState *next_cpu;
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static int event_pending = 1;
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/* Conversion factor from emulated instructions to virtual clock ticks.  */
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static int icount_time_shift;
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/* Arbitrarily pick 1MIPS as the minimum allowable speed.  */
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#define MAX_ICOUNT_SHIFT 10
/* Compensate for varying guest execution speed.  */
static int64_t qemu_icount_bias;
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static QEMUTimer *icount_rt_timer;
static QEMUTimer *icount_vm_timer;
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uint8_t qemu_uuid[16];

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/***********************************************************/
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/* x86 ISA bus support */

target_phys_addr_t isa_mem_base = 0;
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PicState2 *isa_pic;
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static IOPortReadFunc default_ioport_readb, default_ioport_readw, default_ioport_readl;
static IOPortWriteFunc default_ioport_writeb, default_ioport_writew, default_ioport_writel;

static uint32_t ioport_read(int index, uint32_t address)
{
    static IOPortReadFunc *default_func[3] = {
        default_ioport_readb,
        default_ioport_readw,
        default_ioport_readl
    };
    IOPortReadFunc *func = ioport_read_table[index][address];
    if (!func)
        func = default_func[index];
    return func(ioport_opaque[address], address);
}

static void ioport_write(int index, uint32_t address, uint32_t data)
{
    static IOPortWriteFunc *default_func[3] = {
        default_ioport_writeb,
        default_ioport_writew,
        default_ioport_writel
    };
    IOPortWriteFunc *func = ioport_write_table[index][address];
    if (!func)
        func = default_func[index];
    func(ioport_opaque[address], address, data);
}

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

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

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

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static void default_ioport_writew(void *opaque, uint32_t address, uint32_t data)
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{
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    ioport_write(0, address, data & 0xff);
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    address = (address + 1) & (MAX_IOPORTS - 1);
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    ioport_write(0, address, (data >> 8) & 0xff);
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}

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

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static void default_ioport_writel(void *opaque, uint32_t address, uint32_t data)
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{
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#ifdef DEBUG_UNUSED_IOPORT
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    fprintf(stderr, "unused outl: port=0x%04x data=0x%02x\n", address, data);
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#endif
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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,
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                         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 {
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        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)
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            hw_error("register_ioport_read: invalid opaque");
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        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,
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                          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 {
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        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_write: invalid opaque");
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        ioport_opaque[i] = opaque;
    }
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    return 0;
}

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void isa_unassign_ioport(int start, int length)
{
    int i;

    for(i = start; i < start + length; i++) {
        ioport_read_table[0][i] = default_ioport_readb;
        ioport_read_table[1][i] = default_ioport_readw;
        ioport_read_table[2][i] = default_ioport_readl;

        ioport_write_table[0][i] = default_ioport_writeb;
        ioport_write_table[1][i] = default_ioport_writew;
        ioport_write_table[2][i] = default_ioport_writel;
    }
}

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

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void cpu_outb(CPUState *env, int addr, int val)
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{
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#ifdef DEBUG_IOPORT
    if (loglevel & CPU_LOG_IOPORT)
        fprintf(logfile, "outb: %04x %02x\n", addr, val);
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#endif
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    ioport_write(0, addr, val);
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#ifdef USE_KQEMU
    if (env)
        env->last_io_time = cpu_get_time_fast();
#endif
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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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#ifdef DEBUG_IOPORT
    if (loglevel & CPU_LOG_IOPORT)
        fprintf(logfile, "outw: %04x %04x\n", addr, val);
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#endif
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    ioport_write(1, addr, val);
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#ifdef USE_KQEMU
    if (env)
        env->last_io_time = cpu_get_time_fast();
#endif
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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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#ifdef DEBUG_IOPORT
    if (loglevel & CPU_LOG_IOPORT)
        fprintf(logfile, "outl: %04x %08x\n", addr, val);
#endif
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    ioport_write(2, addr, val);
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#ifdef USE_KQEMU
    if (env)
        env->last_io_time = cpu_get_time_fast();
#endif
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}

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int cpu_inb(CPUState *env, int addr)
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{
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    int val;
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    val = ioport_read(0, addr);
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#ifdef DEBUG_IOPORT
    if (loglevel & CPU_LOG_IOPORT)
        fprintf(logfile, "inb : %04x %02x\n", addr, val);
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#endif
#ifdef USE_KQEMU
    if (env)
        env->last_io_time = cpu_get_time_fast();
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#endif
    return val;
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}

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int cpu_inw(CPUState *env, int addr)
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{
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    int val;
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    val = ioport_read(1, addr);
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#ifdef DEBUG_IOPORT
    if (loglevel & CPU_LOG_IOPORT)
        fprintf(logfile, "inw : %04x %04x\n", addr, val);
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#endif
#ifdef USE_KQEMU
    if (env)
        env->last_io_time = cpu_get_time_fast();
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#endif
    return val;
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}

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int cpu_inl(CPUState *env, int addr)
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{
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    int val;
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    val = ioport_read(2, addr);
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#ifdef DEBUG_IOPORT
    if (loglevel & CPU_LOG_IOPORT)
        fprintf(logfile, "inl : %04x %08x\n", addr, val);
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#endif
#ifdef USE_KQEMU
    if (env)
        env->last_io_time = cpu_get_time_fast();
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#endif
    return val;
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}

/***********************************************************/
void hw_error(const char *fmt, ...)
{
    va_list ap;
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    CPUState *env;
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    va_start(ap, fmt);
    fprintf(stderr, "qemu: hardware error: ");
    vfprintf(stderr, fmt, ap);
    fprintf(stderr, "\n");
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    for(env = first_cpu; env != NULL; env = env->next_cpu) {
        fprintf(stderr, "CPU #%d:\n", env->cpu_index);
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#ifdef TARGET_I386
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        cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU);
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#else
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        cpu_dump_state(env, stderr, fprintf, 0);
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#endif
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    }
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    va_end(ap);
    abort();
}
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/***************/
/* ballooning */

static QEMUBalloonEvent *qemu_balloon_event;
void *qemu_balloon_event_opaque;

void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
{
    qemu_balloon_event = func;
    qemu_balloon_event_opaque = opaque;
}

void qemu_balloon(ram_addr_t target)
{
    if (qemu_balloon_event)
        qemu_balloon_event(qemu_balloon_event_opaque, target);
}

ram_addr_t qemu_balloon_status(void)
{
    if (qemu_balloon_event)
        return qemu_balloon_event(qemu_balloon_event_opaque, 0);
    return 0;
}
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/***********************************************************/
/* keyboard/mouse */

static QEMUPutKBDEvent *qemu_put_kbd_event;
static void *qemu_put_kbd_event_opaque;
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static QEMUPutMouseEntry *qemu_put_mouse_event_head;
static QEMUPutMouseEntry *qemu_put_mouse_event_current;
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void qemu_add_kbd_event_handler(QEMUPutKBDEvent *func, void *opaque)
{
    qemu_put_kbd_event_opaque = opaque;
    qemu_put_kbd_event = func;
}

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QEMUPutMouseEntry *qemu_add_mouse_event_handler(QEMUPutMouseEvent *func,
                                                void *opaque, int absolute,
                                                const char *name)
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{
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    QEMUPutMouseEntry *s, *cursor;

    s = qemu_mallocz(sizeof(QEMUPutMouseEntry));
    if (!s)
        return NULL;

    s->qemu_put_mouse_event = func;
    s->qemu_put_mouse_event_opaque = opaque;
    s->qemu_put_mouse_event_absolute = absolute;
    s->qemu_put_mouse_event_name = qemu_strdup(name);
    s->next = NULL;

    if (!qemu_put_mouse_event_head) {
        qemu_put_mouse_event_head = qemu_put_mouse_event_current = s;
        return s;
    }

    cursor = qemu_put_mouse_event_head;
    while (cursor->next != NULL)
        cursor = cursor->next;

    cursor->next = s;
    qemu_put_mouse_event_current = s;

    return s;
}

void qemu_remove_mouse_event_handler(QEMUPutMouseEntry *entry)
{
    QEMUPutMouseEntry *prev = NULL, *cursor;

    if (!qemu_put_mouse_event_head || entry == NULL)
        return;

    cursor = qemu_put_mouse_event_head;
    while (cursor != NULL && cursor != entry) {
        prev = cursor;
        cursor = cursor->next;
    }

    if (cursor == NULL) // does not exist or list empty
        return;
    else if (prev == NULL) { // entry is head
        qemu_put_mouse_event_head = cursor->next;
        if (qemu_put_mouse_event_current == entry)
            qemu_put_mouse_event_current = cursor->next;
        qemu_free(entry->qemu_put_mouse_event_name);
        qemu_free(entry);
        return;
    }

    prev->next = entry->next;

    if (qemu_put_mouse_event_current == entry)
        qemu_put_mouse_event_current = prev;

    qemu_free(entry->qemu_put_mouse_event_name);
    qemu_free(entry);
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}

void kbd_put_keycode(int keycode)
{
    if (qemu_put_kbd_event) {
        qemu_put_kbd_event(qemu_put_kbd_event_opaque, keycode);
    }
}

void kbd_mouse_event(int dx, int dy, int dz, int buttons_state)
{
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    QEMUPutMouseEvent *mouse_event;
    void *mouse_event_opaque;
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    int width;
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    if (!qemu_put_mouse_event_current) {
        return;
    }

    mouse_event =
        qemu_put_mouse_event_current->qemu_put_mouse_event;
    mouse_event_opaque =
        qemu_put_mouse_event_current->qemu_put_mouse_event_opaque;

    if (mouse_event) {
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        if (graphic_rotate) {
            if (qemu_put_mouse_event_current->qemu_put_mouse_event_absolute)
                width = 0x7fff;
            else
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                width = graphic_width - 1;
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            mouse_event(mouse_event_opaque,
                                 width - dy, dx, dz, buttons_state);
        } else
            mouse_event(mouse_event_opaque,
                                 dx, dy, dz, buttons_state);
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    }
}

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int kbd_mouse_is_absolute(void)
{
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    if (!qemu_put_mouse_event_current)
        return 0;

    return qemu_put_mouse_event_current->qemu_put_mouse_event_absolute;
}

void do_info_mice(void)
{
    QEMUPutMouseEntry *cursor;
    int index = 0;

    if (!qemu_put_mouse_event_head) {
        term_printf("No mouse devices connected\n");
        return;
    }

    term_printf("Mouse devices available:\n");
    cursor = qemu_put_mouse_event_head;
    while (cursor != NULL) {
        term_printf("%c Mouse #%d: %s\n",
                    (cursor == qemu_put_mouse_event_current ? '*' : ' '),
                    index, cursor->qemu_put_mouse_event_name);
        index++;
        cursor = cursor->next;
    }
}

void do_mouse_set(int index)
{
    QEMUPutMouseEntry *cursor;
    int i = 0;

    if (!qemu_put_mouse_event_head) {
        term_printf("No mouse devices connected\n");
        return;
    }

    cursor = qemu_put_mouse_event_head;
    while (cursor != NULL && index != i) {
        i++;
        cursor = cursor->next;
    }

    if (cursor != NULL)
        qemu_put_mouse_event_current = cursor;
    else
        term_printf("Mouse at given index not found\n");
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}

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

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/***********************************************************/
/* real time host monotonic timer */
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#define QEMU_TIMER_BASE 1000000000LL
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#ifdef WIN32
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static int64_t clock_freq;
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static void init_get_clock(void)
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{
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    LARGE_INTEGER freq;
    int ret;
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    ret = QueryPerformanceFrequency(&freq);
    if (ret == 0) {
        fprintf(stderr, "Could not calibrate ticks\n");
        exit(1);
    }
    clock_freq = freq.QuadPart;
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}

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static int64_t get_clock(void)
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{
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    LARGE_INTEGER ti;
    QueryPerformanceCounter(&ti);
    return muldiv64(ti.QuadPart, QEMU_TIMER_BASE, clock_freq);
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}

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#else
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static int use_rt_clock;

static void init_get_clock(void)
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{
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    use_rt_clock = 0;
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#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000)
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    {
        struct timespec ts;
        if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
            use_rt_clock = 1;
        }
    }
#endif
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}

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static int64_t get_clock(void)
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{
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#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000)
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    if (use_rt_clock) {
        struct timespec ts;
        clock_gettime(CLOCK_MONOTONIC, &ts);
        return ts.tv_sec * 1000000000LL + ts.tv_nsec;
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    } else
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#endif
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    {
        /* XXX: using gettimeofday leads to problems if the date
           changes, so it should be avoided. */
        struct timeval tv;
        gettimeofday(&tv, NULL);
        return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
    }
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}
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#endif

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/* Return the virtual CPU time, based on the instruction counter.  */
static int64_t cpu_get_icount(void)
{
    int64_t icount;
    CPUState *env = cpu_single_env;;
    icount = qemu_icount;
    if (env) {
        if (!can_do_io(env))
            fprintf(stderr, "Bad clock read\n");
        icount -= (env->icount_decr.u16.low + env->icount_extra);
    }
    return qemu_icount_bias + (icount << icount_time_shift);
}

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/***********************************************************/
/* guest cycle counter */

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static int64_t cpu_ticks_prev;
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static int64_t cpu_ticks_offset;
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static int64_t cpu_clock_offset;
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static int cpu_ticks_enabled;
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/* return the host CPU cycle counter and handle stop/restart */
int64_t cpu_get_ticks(void)
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{
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    if (use_icount) {
        return cpu_get_icount();
    }
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    if (!cpu_ticks_enabled) {
        return cpu_ticks_offset;
    } else {
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        int64_t ticks;
        ticks = cpu_get_real_ticks();
        if (cpu_ticks_prev > ticks) {
            /* Note: non increasing ticks may happen if the host uses
               software suspend */
            cpu_ticks_offset += cpu_ticks_prev - ticks;
        }
        cpu_ticks_prev = ticks;
        return ticks + cpu_ticks_offset;
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    }
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}

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/* return the host CPU monotonic timer and handle stop/restart */
static int64_t cpu_get_clock(void)
{
    int64_t ti;
    if (!cpu_ticks_enabled) {
        return cpu_clock_offset;
    } else {
        ti = get_clock();
        return ti + cpu_clock_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();
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        cpu_clock_offset -= get_clock();
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        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();
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        cpu_clock_offset = cpu_get_clock();
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        cpu_ticks_enabled = 0;
    }
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}

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/***********************************************************/
/* timers */
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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;
};

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struct qemu_alarm_timer {
    char const *name;
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    unsigned int flags;
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    int (*start)(struct qemu_alarm_timer *t);
    void (*stop)(struct qemu_alarm_timer *t);
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    void (*rearm)(struct qemu_alarm_timer *t);
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    void *priv;
};

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#define ALARM_FLAG_DYNTICKS  0x1
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#define ALARM_FLAG_EXPIRED   0x2
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static inline int alarm_has_dynticks(struct qemu_alarm_timer *t)
{
    return t->flags & ALARM_FLAG_DYNTICKS;
}

static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
{
    if (!alarm_has_dynticks(t))
        return;

    t->rearm(t);
}

/* TODO: MIN_TIMER_REARM_US should be optimized */
#define MIN_TIMER_REARM_US 250

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static struct qemu_alarm_timer *alarm_timer;
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#ifndef _WIN32
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static int alarm_timer_rfd, alarm_timer_wfd;
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#endif
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#ifdef _WIN32
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struct qemu_alarm_win32 {
    MMRESULT timerId;
    HANDLE host_alarm;
    unsigned int period;
} alarm_win32_data = {0, NULL, -1};

static int win32_start_timer(struct qemu_alarm_timer *t);
static void win32_stop_timer(struct qemu_alarm_timer *t);
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static void win32_rearm_timer(struct qemu_alarm_timer *t);
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#else
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static int unix_start_timer(struct qemu_alarm_timer *t);
static void unix_stop_timer(struct qemu_alarm_timer *t);

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#ifdef __linux__

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static int dynticks_start_timer(struct qemu_alarm_timer *t);
static void dynticks_stop_timer(struct qemu_alarm_timer *t);
static void dynticks_rearm_timer(struct qemu_alarm_timer *t);

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static int hpet_start_timer(struct qemu_alarm_timer *t);
static void hpet_stop_timer(struct qemu_alarm_timer *t);

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static int rtc_start_timer(struct qemu_alarm_timer *t);
static void rtc_stop_timer(struct qemu_alarm_timer *t);

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#endif /* __linux__ */
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#endif /* _WIN32 */

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/* Correlation between real and virtual time is always going to be
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   fairly approximate, so ignore small variation.
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