static CPUState *cur_cpu;
static CPUState *next_cpu;
static int event_pending = 1;
+/* Conversion factor from emulated instructions to virtual clock ticks. */
+static int icount_time_shift;
+/* Arbitrarily pick 1MIPS as the minimum allowable speed. */
+#define MAX_ICOUNT_SHIFT 10
+/* Compensate for varying guest execution speed. */
+static int64_t qemu_icount_bias;
+QEMUTimer *icount_rt_timer;
+QEMUTimer *icount_vm_timer;
#define TFR(expr) do { if ((expr) != -1) break; } while (errno == EINTR)
return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
}
}
-
#endif
+/* 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);
+}
+
/***********************************************************/
/* guest cycle counter */
/* return the host CPU cycle counter and handle stop/restart */
int64_t cpu_get_ticks(void)
{
+ if (use_icount) {
+ return cpu_get_icount();
+ }
if (!cpu_ticks_enabled) {
return cpu_ticks_offset;
} else {
#endif /* _WIN32 */
+/* Correlation between real and virtual time is always going to be
+ fairly approximate, so ignore small variation.
+ When the guest is idle real and virtual time will be aligned in
+ the IO wait loop. */
+#define ICOUNT_WOBBLE (QEMU_TIMER_BASE / 10)
+
+static void icount_adjust(void)
+{
+ int64_t cur_time;
+ int64_t cur_icount;
+ int64_t delta;
+ static int64_t last_delta;
+ /* If the VM is not running, then do nothing. */
+ if (!vm_running)
+ return;
+
+ cur_time = cpu_get_clock();
+ cur_icount = qemu_get_clock(vm_clock);
+ delta = cur_icount - cur_time;
+ /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */
+ if (delta > 0
+ && last_delta + ICOUNT_WOBBLE < delta * 2
+ && icount_time_shift > 0) {
+ /* The guest is getting too far ahead. Slow time down. */
+ icount_time_shift--;
+ }
+ if (delta < 0
+ && last_delta - ICOUNT_WOBBLE > delta * 2
+ && icount_time_shift < MAX_ICOUNT_SHIFT) {
+ /* The guest is getting too far behind. Speed time up. */
+ icount_time_shift++;
+ }
+ last_delta = delta;
+ qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift);
+}
+
+static void icount_adjust_rt(void * opaque)
+{
+ qemu_mod_timer(icount_rt_timer,
+ qemu_get_clock(rt_clock) + 1000);
+ icount_adjust();
+}
+
+static void icount_adjust_vm(void * opaque)
+{
+ qemu_mod_timer(icount_vm_timer,
+ qemu_get_clock(vm_clock) + QEMU_TIMER_BASE / 10);
+ icount_adjust();
+}
+
+static void init_icount_adjust(void)
+{
+ /* Have both realtime and virtual time triggers for speed adjustment.
+ The realtime trigger catches emulated time passing too slowly,
+ the virtual time trigger catches emulated time passing too fast.
+ Realtime triggers occur even when idle, so use them less frequently
+ than VM triggers. */
+ icount_rt_timer = qemu_new_timer(rt_clock, icount_adjust_rt, NULL);
+ qemu_mod_timer(icount_rt_timer,
+ qemu_get_clock(rt_clock) + 1000);
+ icount_vm_timer = qemu_new_timer(vm_clock, icount_adjust_vm, NULL);
+ qemu_mod_timer(icount_vm_timer,
+ qemu_get_clock(vm_clock) + QEMU_TIMER_BASE / 10);
+}
+
static struct qemu_alarm_timer alarm_timers[] = {
#ifndef _WIN32
#ifdef __linux__
int count = (sizeof(alarm_timers) / sizeof(*alarm_timers)) - 1;
char *arg;
char *name;
+ struct qemu_alarm_timer tmp;
if (!strcmp(opt, "?")) {
show_available_alarms();
/* Reorder the array */
name = strtok(arg, ",");
while (name) {
- struct qemu_alarm_timer tmp;
-
for (i = 0; i < count && alarm_timers[i].name; i++) {
if (!strcmp(alarm_timers[i].name, name))
break;
free(arg);
if (cur) {
- /* Disable remaining timers */
+ /* Disable remaining timers */
for (i = cur; i < count; i++)
alarm_timers[i].name = NULL;
} else {
*pt = ts;
/* Rearm if necessary */
- if ((alarm_timer->flags & ALARM_FLAG_EXPIRED) == 0 &&
- pt == &active_timers[ts->clock->type])
- qemu_rearm_alarm_timer(alarm_timer);
+ if (pt == &active_timers[ts->clock->type]) {
+ if ((alarm_timer->flags & ALARM_FLAG_EXPIRED) == 0) {
+ qemu_rearm_alarm_timer(alarm_timer);
+ }
+ /* Interrupt execution to force deadline recalculation. */
+ if (use_icount && cpu_single_env) {
+ cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
+ }
+ }
}
int qemu_timer_pending(QEMUTimer *ts)
return get_clock() / 1000000;
default:
case QEMU_TIMER_VIRTUAL:
- return cpu_get_clock();
+ if (use_icount) {
+ return cpu_get_icount();
+ } else {
+ return cpu_get_clock();
+ }
}
}
}
#endif
if (alarm_has_dynticks(alarm_timer) ||
- qemu_timer_expired(active_timers[QEMU_TIMER_VIRTUAL],
- qemu_get_clock(vm_clock)) ||
+ (!use_icount &&
+ 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))) {
#ifdef _WIN32
}
}
-static uint64_t qemu_next_deadline(void)
+static int64_t qemu_next_deadline(void)
{
- int64_t nearest_delta_us = INT64_MAX;
- int64_t vmdelta_us;
-
- if (active_timers[QEMU_TIMER_REALTIME])
- nearest_delta_us = (active_timers[QEMU_TIMER_REALTIME]->expire_time -
- qemu_get_clock(rt_clock))*1000;
+ int64_t delta;
if (active_timers[QEMU_TIMER_VIRTUAL]) {
- /* round up */
- vmdelta_us = (active_timers[QEMU_TIMER_VIRTUAL]->expire_time -
- qemu_get_clock(vm_clock)+999)/1000;
- if (vmdelta_us < nearest_delta_us)
- nearest_delta_us = vmdelta_us;
+ delta = active_timers[QEMU_TIMER_VIRTUAL]->expire_time -
+ qemu_get_clock(vm_clock);
+ } else {
+ /* To avoid problems with overflow limit this to 2^32. */
+ delta = INT32_MAX;
}
- /* Avoid arming the timer to negative, zero, or too low values */
- if (nearest_delta_us <= MIN_TIMER_REARM_US)
- nearest_delta_us = MIN_TIMER_REARM_US;
+ if (delta < 0)
+ delta = 0;
- return nearest_delta_us;
+ return delta;
+}
+
+static uint64_t qemu_next_deadline_dyntick(void)
+{
+ int64_t delta;
+ int64_t rtdelta;
+
+ if (use_icount)
+ delta = INT32_MAX;
+ else
+ delta = (qemu_next_deadline() + 999) / 1000;
+
+ if (active_timers[QEMU_TIMER_REALTIME]) {
+ rtdelta = (active_timers[QEMU_TIMER_REALTIME]->expire_time -
+ qemu_get_clock(rt_clock))*1000;
+ if (rtdelta < delta)
+ delta = rtdelta;
+ }
+
+ if (delta < MIN_TIMER_REARM_US)
+ delta = MIN_TIMER_REARM_US;
+
+ return delta;
}
#ifndef _WIN32
!active_timers[QEMU_TIMER_VIRTUAL])
return;
- nearest_delta_us = qemu_next_deadline();
+ nearest_delta_us = qemu_next_deadline_dyntick();
/* check whether a timer is already running */
if (timer_gettime(host_timer, &timeout)) {
!active_timers[QEMU_TIMER_VIRTUAL])
return;
- nearest_delta_us = qemu_next_deadline();
+ nearest_delta_us = qemu_next_deadline_dyntick();
nearest_delta_us /= 1000;
timeKillEvent(data->timerId);
#ifndef _WIN32
if (is_unix) {
char path[109];
- strncpy(path, uaddr.sun_path, 108);
- path[108] = 0;
+ pstrcpy(path, sizeof(path), uaddr.sun_path);
unlink(path);
} else
#endif
}
if (get_param_value(buf, sizeof(buf), "if", str)) {
- strncpy(devname, buf, sizeof(devname));
+ pstrcpy(devname, sizeof(devname), buf);
if (!strcmp(buf, "ide")) {
type = IF_IDE;
max_devs = MAX_IDE_DEVS;
static SaveStateEntry *first_se;
+/* TODO: Individual devices generally have very little idea about the rest
+ of the system, so instance_id should be removed/replaced. */
int register_savevm(const char *idstr,
int instance_id,
int version_id,
if (!se)
return -1;
pstrcpy(se->idstr, sizeof(se->idstr), idstr);
- se->instance_id = instance_id;
+ se->instance_id = (instance_id == -1) ? 0 : instance_id;
se->version_id = version_id;
se->save_state = save_state;
se->load_state = load_state;
/* add at the end of list */
pse = &first_se;
- while (*pse != NULL)
+ while (*pse != NULL) {
+ if (instance_id == -1
+ && strcmp(se->idstr, (*pse)->idstr) == 0
+ && se->instance_id <= (*pse)->instance_id)
+ se->instance_id = (*pse)->instance_id + 1;
pse = &(*pse)->next;
+ }
*pse = se;
return 0;
}
qemu_put_be64(f, 0); /* total size */
for(se = first_se; se != NULL; se = se->next) {
+ if (se->save_state == NULL)
+ /* this one has a loader only, for backwards compatibility */
+ continue;
+
/* ID string */
len = strlen(se->idstr);
qemu_put_byte(f, len);
cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
}
-/* boot_set handler */
-QEMUBootSetHandler *qemu_boot_set_handler = NULL;
-
-void qemu_register_boot_set(QEMUBootSetHandler *func)
-{
- qemu_boot_set_handler = func;
-}
-
void main_loop_wait(int timeout)
{
IOHandlerRecord *ioh;
qemu_aio_poll();
if (vm_running) {
+ if (likely(!(cur_cpu->singlestep_enabled & SSTEP_NOTIMER)))
qemu_run_timers(&active_timers[QEMU_TIMER_VIRTUAL],
qemu_get_clock(vm_clock));
/* run dma transfers, if any */
#ifdef CONFIG_PROFILER
ti = profile_getclock();
#endif
+ if (use_icount) {
+ int64_t count;
+ int decr;
+ qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
+ env->icount_decr.u16.low = 0;
+ env->icount_extra = 0;
+ count = qemu_next_deadline();
+ count = (count + (1 << icount_time_shift) - 1)
+ >> icount_time_shift;
+ qemu_icount += count;
+ decr = (count > 0xffff) ? 0xffff : count;
+ count -= decr;
+ env->icount_decr.u16.low = decr;
+ env->icount_extra = count;
+ }
ret = cpu_exec(env);
#ifdef CONFIG_PROFILER
qemu_time += profile_getclock() - ti;
#endif
+ if (use_icount) {
+ /* Fold pending instructions back into the
+ instruction counter, and clear the interrupt flag. */
+ qemu_icount -= (env->icount_decr.u16.low
+ + env->icount_extra);
+ env->icount_decr.u32 = 0;
+ env->icount_extra = 0;
+ }
next_cpu = env->next_cpu ?: first_cpu;
if (event_pending && likely(ret != EXCP_DEBUG)) {
ret = EXCP_INTERRUPT;
}
/* If all cpus are halted then wait until the next IRQ */
/* XXX: use timeout computed from timers */
- if (ret == EXCP_HALTED)
- timeout = 10;
- else
+ if (ret == EXCP_HALTED) {
+ if (use_icount) {
+ int64_t add;
+ int64_t delta;
+ /* Advance virtual time to the next event. */
+ if (use_icount == 1) {
+ /* When not using an adaptive execution frequency
+ we tend to get badly out of sync with real time,
+ so just delay for a reasonable amount of time. */
+ delta = 0;
+ } else {
+ delta = cpu_get_icount() - cpu_get_clock();
+ }
+ if (delta > 0) {
+ /* If virtual time is ahead of real time then just
+ wait for IO. */
+ timeout = (delta / 1000000) + 1;
+ } else {
+ /* Wait for either IO to occur or the next
+ timer event. */
+ add = qemu_next_deadline();
+ /* We advance the timer before checking for IO.
+ Limit the amount we advance so that early IO
+ activity won't get the guest too far ahead. */
+ if (add > 10000000)
+ add = 10000000;
+ delta += add;
+ add = (add + (1 << icount_time_shift) - 1)
+ >> icount_time_shift;
+ qemu_icount += add;
+ timeout = delta / 1000000;
+ if (timeout < 0)
+ timeout = 0;
+ }
+ } else {
+ timeout = 10;
+ }
+ } else {
timeout = 0;
+ }
} else {
timeout = 10;
}
"-clock force the use of the given methods for timer alarm.\n"
" To see what timers are available use -clock ?\n"
"-startdate select initial date of the clock\n"
+ "-icount [N|auto]\n"
+ " Enable virtual instruction counter with 2^N clock ticks per instruction\n"
"\n"
"During emulation, the following keys are useful:\n"
"ctrl-alt-f toggle full screen\n"
QEMU_OPTION_hdachs,
QEMU_OPTION_L,
QEMU_OPTION_bios,
- QEMU_OPTION_no_code_copy,
QEMU_OPTION_k,
QEMU_OPTION_localtime,
QEMU_OPTION_cirrusvga,
QEMU_OPTION_old_param,
QEMU_OPTION_clock,
QEMU_OPTION_startdate,
+ QEMU_OPTION_tb_size,
+ QEMU_OPTION_icount,
};
typedef struct QEMUOption {
{ "hdachs", HAS_ARG, QEMU_OPTION_hdachs },
{ "L", HAS_ARG, QEMU_OPTION_L },
{ "bios", HAS_ARG, QEMU_OPTION_bios },
- { "no-code-copy", 0, QEMU_OPTION_no_code_copy },
#ifdef USE_KQEMU
{ "no-kqemu", 0, QEMU_OPTION_no_kqemu },
{ "kernel-kqemu", 0, QEMU_OPTION_kernel_kqemu },
#endif
{ "clock", HAS_ARG, QEMU_OPTION_clock },
{ "startdate", HAS_ARG, QEMU_OPTION_startdate },
+ { "tb-size", HAS_ARG, QEMU_OPTION_tb_size },
+ { "icount", HAS_ARG, QEMU_OPTION_icount },
{ NULL },
};
{ .init_isa = SB16_init }
},
+#ifdef CONFIG_CS4231A
+ {
+ "cs4231a",
+ "CS4231A",
+ 0,
+ 1,
+ { .init_isa = cs4231a_init }
+ },
+#endif
+
#ifdef CONFIG_ADLIB
{
"adlib",
const char *usb_devices[MAX_USB_CMDLINE];
int usb_devices_index;
int fds[2];
+ int tb_size;
const char *pid_file = NULL;
VLANState *vlan;
kernel_cmdline = "";
cyls = heads = secs = 0;
translation = BIOS_ATA_TRANSLATION_AUTO;
- monitor_device = "vc:800x600";
+ monitor_device = "vc";
serial_devices[0] = "vc:80Cx24C";
for(i = 1; i < MAX_SERIAL_PORTS; i++)
hda_index = -1;
nb_nics = 0;
- /* default mac address of the first network interface */
+ tb_size = 0;
+
optind = 1;
for(;;) {
if (optind >= argc)
fd_bootchk = 0;
break;
#endif
- case QEMU_OPTION_no_code_copy:
- code_copy_enabled = 0;
- break;
case QEMU_OPTION_net:
if (nb_net_clients >= MAX_NET_CLIENTS) {
fprintf(stderr, "qemu: too many network clients\n");
}
}
break;
+ case QEMU_OPTION_tb_size:
+ tb_size = strtol(optarg, NULL, 0);
+ if (tb_size < 0)
+ tb_size = 0;
+ break;
+ case QEMU_OPTION_icount:
+ use_icount = 1;
+ if (strcmp(optarg, "auto") == 0) {
+ icount_time_shift = -1;
+ } else {
+ icount_time_shift = strtol(optarg, NULL, 0);
+ }
+ break;
}
}
}
nb_drives_opt == 0)
help(1);
+ if (!linux_boot && *kernel_cmdline != '\0') {
+ fprintf(stderr, "-append only allowed with -kernel option\n");
+ exit(1);
+ }
+
+ if (!linux_boot && initrd_filename != NULL) {
+ fprintf(stderr, "-initrd only allowed with -kernel option\n");
+ exit(1);
+ }
+
/* boot to floppy or the default cd if no hard disk defined yet */
if (!boot_devices[0]) {
boot_devices = "cad";
init_timers();
init_timer_alarm();
qemu_aio_init();
+ if (use_icount && icount_time_shift < 0) {
+ use_icount = 2;
+ /* 125MIPS seems a reasonable initial guess at the guest speed.
+ It will be corrected fairly quickly anyway. */
+ icount_time_shift = 3;
+ init_icount_adjust();
+ }
#ifdef _WIN32
socket_init();
exit(1);
}
+ /* init the dynamic translator */
+ cpu_exec_init_all(tb_size * 1024 * 1024);
+
bdrv_init();
/* we always create the cdrom drive, even if no disk is there */
projects / mirror_qemu.git / blobdiff