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59c4597071
This allows the minimum time that default_delay() will choose to sleep for instead of polling to be configured at build-time. The default remains unchanged at 100 milliseconds for now. The test's correctness has been checked by testing with minimum sleep time left at its default and set to a non-default value smaller than 100 microseconds (both pass without sleeping, verified with strace) and with the minimum sleep time set to 0 (causing the test to be skipped). The configured value from the macro needs to be stored in a const to avoid -Werror=type-limits errors when configured to be zero. Change-Id: Ida96e0816ac914ed69d6fd82ad90ebe89cdef1cc Signed-off-by: Peter Marheine <pmarheine@chromium.org> Reviewed-on: https://review.coreboot.org/c/flashrom/+/81606 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* Copyright (C) 2000 Silicon Integrated System Corporation
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* Copyright (C) 2009,2010 Carl-Daniel Hailfinger
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* Copyright (C) 2024 Google LLC
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __LIBPAYLOAD__
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#include <stdbool.h>
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#include <unistd.h>
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#include <errno.h>
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#include <time.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include <limits.h>
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#include "flash.h"
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#include "programmer.h"
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#if HAVE_CLOCK_GETTIME == 1
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static void clock_usec_delay(int usecs)
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{
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static clockid_t clock_id =
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#ifdef _POSIX_MONOTONIC_CLOCK
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CLOCK_MONOTONIC;
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#else
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CLOCK_REALTIME;
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#endif
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struct timespec now;
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if (clock_gettime(clock_id, &now)) {
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/* Fall back to realtime clock if monotonic doesn't work */
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if (clock_id != CLOCK_REALTIME && errno == EINVAL) {
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clock_id = CLOCK_REALTIME;
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clock_gettime(clock_id, &now);
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}
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}
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const long end_nsec = now.tv_nsec + usecs * 1000L;
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const struct timespec end = {
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end_nsec / (1000 * 1000 * 1000) + now.tv_sec,
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end_nsec % (1000 * 1000 * 1000)
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};
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do {
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clock_gettime(clock_id, &now);
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} while (now.tv_sec < end.tv_sec || (now.tv_sec == end.tv_sec && now.tv_nsec < end.tv_nsec));
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}
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#else
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static void clock_usec_delay(unsigned int usecs) {
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struct timeval start, end;
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unsigned long elapsed = 0;
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gettimeofday(&start, NULL);
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while (elapsed < usecs) {
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gettimeofday(&end, NULL);
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elapsed = 1000000 * (end.tv_sec - start.tv_sec) +
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(end.tv_usec - start.tv_usec);
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/* Protect against time going forward too much. */
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if ((end.tv_sec > start.tv_sec) &&
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((end.tv_sec - start.tv_sec) >= LONG_MAX / 1000000 - 1))
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elapsed = 0;
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/* Protect against time going backwards during leap seconds. */
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if ((end.tv_sec < start.tv_sec) || (elapsed > LONG_MAX))
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elapsed = 0;
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}
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}
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#endif /* HAVE_CLOCK_GETTIME == 1 */
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/* Not very precise sleep. */
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void internal_sleep(unsigned int usecs)
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{
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#if IS_WINDOWS
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Sleep((usecs + 999) / 1000);
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#else
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nanosleep(&(struct timespec){usecs / 1000000, (usecs * 1000) % 1000000000UL}, NULL);
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#endif
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}
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static const unsigned min_sleep = CONFIG_DELAY_MINIMUM_SLEEP_US;
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/* Precise delay. */
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void default_delay(unsigned int usecs)
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{
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if (usecs < min_sleep) {
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clock_usec_delay(usecs);
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} else {
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internal_sleep(usecs);
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}
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}
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#else
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#include <libpayload.h>
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void default_delay(unsigned int usecs)
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{
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udelay(usecs);
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}
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#endif
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