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/* Copyright 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Timer module */
#include <stdint.h>
#include <stdio.h>
#include "task.h"
#include "test_util.h"
#include "timer.h"
#include "util.h"
static timestamp_t boot_time;
static int time_set;
void usleep(unsigned us)
{
if (!task_start_called() || task_get_current() == TASK_ID_INVALID) {
udelay(us);
return;
}
ASSERT(!in_interrupt_context() &&
task_get_current() != TASK_ID_INT_GEN);
task_wait_event(us);
}
timestamp_t _get_time(void)
{
static timestamp_t time;
/*
* We just monotonically increase the microsecond every time we check
* the time. Do not depend on host system time as this introduces
* flakyness in tests. The time is periodically fast forwarded with
* force_time() during the host's task scheduler implementation.
*/
++time.val;
return time;
}
test_mockable timestamp_t get_time(void)
{
timestamp_t ret = _get_time();
ret.val -= boot_time.val;
return ret;
}
uint32_t __hw_clock_source_read(void)
{
return get_time().le.lo;
}
void force_time(timestamp_t ts)
{
timestamp_t now = _get_time();
boot_time.val = now.val - ts.val;
time_set = 1;
}
void udelay(unsigned us)
{
timestamp_t deadline;
if (!in_interrupt_context() && task_get_current() == TASK_ID_INT_GEN) {
interrupt_generator_udelay(us);
return;
}
deadline.val = get_time().val + us;
while (get_time().val < deadline.val)
;
}
int timestamp_expired(timestamp_t deadline, const timestamp_t *now)
{
timestamp_t now_val;
if (!now) {
now_val = get_time();
now = &now_val;
}
return ((int64_t)(now->val - deadline.val) >= 0);
}
void timer_init(void)
{
if (!time_set) {
/*
* Start the timer just before the 64-bit rollover to try
* and catch 32-bit rollover/truncation bugs.
*/
timestamp_t ts = {
.val = 0xFFFFFFF0
};
force_time(ts);
}
}
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