Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 230 insertions, 0 deletions

diff --git a/qemu/hw/core/ptimer.c b/qemu/hw/core/ptimer.c
new file mode 100644
index 000000000..8437bd6e8
--- /dev/null
+++ b/qemu/hw/core/ptimer.c
@@ -0,0 +1,230 @@
+/*
+ * General purpose implementation of a simple periodic countdown timer.
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ *
+ * This code is licensed under the GNU LGPL.
+ */
+#include "hw/hw.h"
+#include "qemu/timer.h"
+#include "hw/ptimer.h"
+#include "qemu/host-utils.h"
+
+struct ptimer_state
+{
+    uint8_t 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;
+    }
+    timer_mod(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_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+        /* 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;
+            int clz1, clz2;
+            int shift;
+
+            /* We need to divide time by period, where time is stored in
+               rem (64-bit integer) and period is stored in period/period_frac
+               (64.32 fixed point).
+              
+               Doing full precision division is hard, so scale values and
+               do a 64-bit division.  The result should be rounded down,
+               so that the rounding error never causes the timer to go
+               backwards.
+            */
+
+            rem = s->next_event - now;
+            div = s->period;
+
+            clz1 = clz64(rem);
+            clz2 = clz64(div);
+            shift = clz1 < clz2 ? clz1 : clz2;
+
+            rem <<= shift;
+            div <<= shift;
+            if (shift >= 32) {
+                div |= ((uint64_t)s->period_frac << (shift - 32));
+            } else {
+                if (shift != 0)
+                    div |= (s->period_frac >> (32 - shift));
+                /* Look at remaining bits of period_frac and round div up if 
+                   necessary.  */
+                if ((uint32_t)(s->period_frac << shift))
+                    div += 1;
+            }
+            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_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+        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_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+    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);
+    timer_del(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_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+        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_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+        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)
+{
+    /*
+     * Artificially limit timeout rate to something
+     * achievable under QEMU.  Otherwise, QEMU spends all
+     * its time generating timer interrupts, and there
+     * is no forward progress.
+     * About ten microseconds is the fastest that really works
+     * on the current generation of host machines.
+     */
+
+    if (!use_icount && limit * s->period < 10000 && s->period) {
+        limit = 10000 / s->period;
+    }
+
+    s->limit = limit;
+    if (reload)
+        s->delta = limit;
+    if (s->enabled && reload) {
+        s->next_event = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+        ptimer_reload(s);
+    }
+}
+
+const VMStateDescription vmstate_ptimer = {
+    .name = "ptimer",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8(enabled, ptimer_state),
+        VMSTATE_UINT64(limit, ptimer_state),
+        VMSTATE_UINT64(delta, ptimer_state),
+        VMSTATE_UINT32(period_frac, ptimer_state),
+        VMSTATE_INT64(period, ptimer_state),
+        VMSTATE_INT64(last_event, ptimer_state),
+        VMSTATE_INT64(next_event, ptimer_state),
+        VMSTATE_TIMER_PTR(timer, ptimer_state),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+ptimer_state *ptimer_init(QEMUBH *bh)
+{
+    ptimer_state *s;
+
+    s = (ptimer_state *)g_malloc0(sizeof(ptimer_state));
+    s->bh = bh;
+    s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ptimer_tick, s);
+    return s;
+}