--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/qemu-symbian-svp/hw/ptimer.c Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,194 @@
+/*
+ * General purpose implementation of a simple periodic countdown timer.
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ *
+ * This code is licenced under the GNU LGPL.
+ */
+#include "hw.h"
+#include "qemu-timer.h"
+
+
+struct ptimer_state
+{
+ int enabled; /* 0 = disabled, 1 = periodic, 2 = oneshot. */
+ uint64_t limit;
+ uint64_t delta;
+ uint32_t period_frac;
+ int64_t period;
+ int64_t last_event;
+ int64_t next_event;
+ QEMUBH *bh;
+ QEMUTimer *timer;
+};
+
+/* Use a bottom-half routine to avoid reentrancy issues. */
+static void ptimer_trigger(ptimer_state *s)
+{
+ if (s->bh) {
+ qemu_bh_schedule(s->bh);
+ }
+}
+
+static void ptimer_reload(ptimer_state *s)
+{
+ if (s->delta == 0) {
+ ptimer_trigger(s);
+ s->delta = s->limit;
+ }
+ if (s->delta == 0 || s->period == 0) {
+ fprintf(stderr, "Timer with period zero, disabling\n");
+ s->enabled = 0;
+ return;
+ }
+
+ s->last_event = s->next_event;
+ s->next_event = s->last_event + s->delta * s->period;
+ if (s->period_frac) {
+ s->next_event += ((int64_t)s->period_frac * s->delta) >> 32;
+ }
+ qemu_mod_timer(s->timer, s->next_event);
+}
+
+static void ptimer_tick(void *opaque)
+{
+ ptimer_state *s = (ptimer_state *)opaque;
+ ptimer_trigger(s);
+ s->delta = 0;
+ if (s->enabled == 2) {
+ s->enabled = 0;
+ } else {
+ ptimer_reload(s);
+ }
+}
+
+uint64_t ptimer_get_count(ptimer_state *s)
+{
+ int64_t now;
+ uint64_t counter;
+
+ if (s->enabled) {
+ now = qemu_get_clock(vm_clock);
+ /* Figure out the current counter value. */
+ if (now - s->next_event > 0
+ || s->period == 0) {
+ /* Prevent timer underflowing if it should already have
+ triggered. */
+ counter = 0;
+ } else {
+ uint64_t rem;
+ uint64_t div;
+
+ rem = s->next_event - now;
+ div = s->period;
+ counter = rem / div;
+ }
+ } else {
+ counter = s->delta;
+ }
+ return counter;
+}
+
+void ptimer_set_count(ptimer_state *s, uint64_t count)
+{
+ s->delta = count;
+ if (s->enabled) {
+ s->next_event = qemu_get_clock(vm_clock);
+ ptimer_reload(s);
+ }
+}
+
+void ptimer_run(ptimer_state *s, int oneshot)
+{
+ if (s->enabled) {
+ return;
+ }
+ if (s->period == 0) {
+ fprintf(stderr, "Timer with period zero, disabling\n");
+ return;
+ }
+ s->enabled = oneshot ? 2 : 1;
+ s->next_event = qemu_get_clock(vm_clock);
+ ptimer_reload(s);
+}
+
+/* Pause a timer. Note that this may cause it to "lose" time, even if it
+ is immediately restarted. */
+void ptimer_stop(ptimer_state *s)
+{
+ if (!s->enabled)
+ return;
+
+ s->delta = ptimer_get_count(s);
+ qemu_del_timer(s->timer);
+ s->enabled = 0;
+}
+
+/* Set counter increment interval in nanoseconds. */
+void ptimer_set_period(ptimer_state *s, int64_t period)
+{
+ s->period = period;
+ s->period_frac = 0;
+ if (s->enabled) {
+ s->next_event = qemu_get_clock(vm_clock);
+ ptimer_reload(s);
+ }
+}
+
+/* Set counter frequency in Hz. */
+void ptimer_set_freq(ptimer_state *s, uint32_t freq)
+{
+ s->period = 1000000000ll / freq;
+ s->period_frac = (1000000000ll << 32) / freq;
+ if (s->enabled) {
+ s->next_event = qemu_get_clock(vm_clock);
+ ptimer_reload(s);
+ }
+}
+
+/* Set the initial countdown value. If reload is nonzero then also set
+ count = limit. */
+void ptimer_set_limit(ptimer_state *s, uint64_t limit, int reload)
+{
+ s->limit = limit;
+ if (reload)
+ s->delta = limit;
+ if (s->enabled && reload) {
+ s->next_event = qemu_get_clock(vm_clock);
+ ptimer_reload(s);
+ }
+}
+
+void qemu_put_ptimer(QEMUFile *f, ptimer_state *s)
+{
+ qemu_put_byte(f, s->enabled);
+ qemu_put_be64s(f, &s->limit);
+ qemu_put_be64s(f, &s->delta);
+ qemu_put_be32s(f, &s->period_frac);
+ qemu_put_sbe64s(f, &s->period);
+ qemu_put_sbe64s(f, &s->last_event);
+ qemu_put_sbe64s(f, &s->next_event);
+ qemu_put_timer(f, s->timer);
+}
+
+void qemu_get_ptimer(QEMUFile *f, ptimer_state *s)
+{
+ s->enabled = qemu_get_byte(f);
+ qemu_get_be64s(f, &s->limit);
+ qemu_get_be64s(f, &s->delta);
+ qemu_get_be32s(f, &s->period_frac);
+ qemu_get_sbe64s(f, &s->period);
+ qemu_get_sbe64s(f, &s->last_event);
+ qemu_get_sbe64s(f, &s->next_event);
+ qemu_get_timer(f, s->timer);
+}
+
+ptimer_state *ptimer_init(QEMUBH *bh)
+{
+ ptimer_state *s;
+
+ s = (ptimer_state *)qemu_mallocz(sizeof(ptimer_state));
+ s->bh = bh;
+ s->timer = qemu_new_timer(vm_clock, ptimer_tick, s);
+ return s;
+}