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/* Copyright (c) 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 <time.h>
#include "task.h"
#include "test_util.h"
#include "timer.h"
#include "util.h"
/*
* For test that need to test for longer than the default time limit,
* adjust its time scale in test/build.mk by specifying
* <test_name>-scale=<new scale>.
*/
#ifndef TEST_TIME_SCALE
#define TEST_TIME_SCALE 1
#endif
/*
* To increase the stability of timing sensitive unit tests, slow
* down the time by 10x. This only affects active run time (including
* udelay() calls). To an unit test, the only effect is increased code
* execution speed. However, this comes at the cost of prolonged test
* run time for tests that use udelay(). Fortunately, most of our tests
* use usleep/msleep, and for tests that use udelay(), we can scale
* the time as mentioned above.
*/
#define TEST_TIME_SLOW_DOWN 10
static timestamp_t boot_time;
static int time_set;
void usleep(unsigned us)
{
if (!task_start_called()) {
udelay(us);
return;
}
ASSERT(!in_interrupt_context() &&
task_get_current() != TASK_ID_INT_GEN);
task_wait_event(us);
}
timestamp_t _get_time(void)
{
struct timespec ts;
timestamp_t ret;
clock_gettime(CLOCK_MONOTONIC, &ts);
ret.val = (1000000000 * (uint64_t)ts.tv_sec + ts.tv_nsec) *
TEST_TIME_SCALE / 1000 / TEST_TIME_SLOW_DOWN;
return ret;
}
timestamp_t get_time(void)
{
timestamp_t ret = _get_time();
ret.val -= boot_time.val;
return ret;
}
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)
boot_time = _get_time();
}
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