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qemu-timer: Fix timers for w32

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Commit 68c23e5520e8286d79d96ab47c0ea722ceb75041 removed the
multimedia timer, but this timer is needed for certain
Linux kernels. Otherwise Linux boot stops with this error:

    MP-BIOS bug: 8254 timer not connected to IO-APIC

So the multimedia timer is added again here.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
This commit is contained in:
Stefan Weil 2011-04-05 18:34:21 +02:00
parent cd0544ee55
commit 2f9cba0c14
1 changed files with 96 additions and 0 deletions
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96
qemu-timer.c
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@ -215,6 +215,10 @@ static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
#ifdef _WIN32
static int mm_start_timer(struct qemu_alarm_timer *t);
static void mm_stop_timer(struct qemu_alarm_timer *t);
static void mm_rearm_timer(struct qemu_alarm_timer *t);
static int win32_start_timer(struct qemu_alarm_timer *t);
static void win32_stop_timer(struct qemu_alarm_timer *t);
static void win32_rearm_timer(struct qemu_alarm_timer *t);
@ -307,6 +311,8 @@ static struct qemu_alarm_timer alarm_timers[] = {
#endif
{"unix", unix_start_timer, unix_stop_timer, NULL},
#else
{"mmtimer", mm_start_timer, mm_stop_timer, NULL},
{"mmtimer2", mm_start_timer, mm_stop_timer, mm_rearm_timer},
{"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer},
{"win32", win32_start_timer, win32_stop_timer, NULL},
#endif
@ -1040,6 +1046,96 @@ static void unix_stop_timer(struct qemu_alarm_timer *t)
#ifdef _WIN32
static MMRESULT mm_timer;
static unsigned mm_period;
static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg,
DWORD_PTR dwUser, DWORD_PTR dw1,
DWORD_PTR dw2)
{
struct qemu_alarm_timer *t = alarm_timer;
if (!t) {
return;
}
if (alarm_has_dynticks(t) || qemu_next_alarm_deadline() <= 0) {
t->expired = alarm_has_dynticks(t);
t->pending = 1;
qemu_notify_event();
}
}
static int mm_start_timer(struct qemu_alarm_timer *t)
{
TIMECAPS tc;
UINT flags;
memset(&tc, 0, sizeof(tc));
timeGetDevCaps(&tc, sizeof(tc));
mm_period = tc.wPeriodMin;
timeBeginPeriod(mm_period);
flags = TIME_CALLBACK_FUNCTION;
if (alarm_has_dynticks(t)) {
flags |= TIME_ONESHOT;
} else {
flags |= TIME_PERIODIC;
}
mm_timer = timeSetEvent(1, /* interval (ms) */
mm_period, /* resolution */
mm_alarm_handler, /* function */
(DWORD_PTR)t, /* parameter */
flags);
if (!mm_timer) {
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
GetLastError());
timeEndPeriod(mm_period);
return -1;
}
return 0;
}
static void mm_stop_timer(struct qemu_alarm_timer *t)
{
timeKillEvent(mm_timer);
timeEndPeriod(mm_period);
}
static void mm_rearm_timer(struct qemu_alarm_timer *t)
{
int nearest_delta_ms;
assert(alarm_has_dynticks(t));
if (!active_timers[QEMU_CLOCK_REALTIME] &&
!active_timers[QEMU_CLOCK_VIRTUAL] &&
!active_timers[QEMU_CLOCK_HOST]) {
return;
}
timeKillEvent(mm_timer);
nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000;
if (nearest_delta_ms < 1) {
nearest_delta_ms = 1;
}
mm_timer = timeSetEvent(nearest_delta_ms,
mm_period,
mm_alarm_handler,
(DWORD_PTR)t,
TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
if (!mm_timer) {
fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n",
GetLastError());
timeEndPeriod(mm_period);
exit(1);
}
}
static int win32_start_timer(struct qemu_alarm_timer *t)
{
HANDLE hTimer;