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udelay: move into platform folder

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Change-Id: I9910cd1f5850a6f86e26bb1dc4ff26614f0a0964
Signed-off-by: Antonio Vázquez Blanco <antoniovazquezblanco@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/88270
Reviewed-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Antonio Vázquez Blanco
2025-03-01 18:40:47 +01:00
committed by Anastasia Klimchuk
parent e5f377c662
commit 51a7275a31
26 changed files with 57 additions and 16 deletions
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11
platform/meson.build
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@ -10,6 +10,16 @@ if host_machine.endian() == 'big'
add_project_arguments('-D__FLASHROM_BIG_ENDIAN__=1', language : 'c')
endif
# Select an appropriate delay implementation for the target OS
delay_src = files('udelay.c')
if target_machine.system() == 'dos'
delay_src = files('udelay_dos.c')
endif
srcs += delay_src
cargs += ['-DCONFIG_DELAY_MINIMUM_SLEEP_US=@0@'.format(
get_option('delay_minimum_sleep_us')
)]
# OpenBSD requires libi386 or libamd64 for I/O port handling
if host_machine.system() == 'openbsd'
if host_machine.cpu_family() == 'x86'
@ -32,7 +42,6 @@ if host_machine.system() == 'netbsd'
endif
endif
# SunOS requires external libraries for network sockets
# they are used to support serial devices via network
if host_machine.system() == 'sunos'

116
platform/udelay.c Normal file
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@ -0,0 +1,116 @@
/*
* This file is part of the flashrom project.
*
* Copyright (C) 2000 Silicon Integrated System Corporation
* Copyright (C) 2009,2010 Carl-Daniel Hailfinger
* Copyright (C) 2024 Google LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __LIBPAYLOAD__
#include "platform/udelay.h"
#include <stdbool.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <stdlib.h>
#include <limits.h>
#include "flash.h"
#include "programmer.h"
#if HAVE_CLOCK_GETTIME == 1
static void clock_usec_delay(int usecs)
{
static clockid_t clock_id =
#ifdef _POSIX_MONOTONIC_CLOCK
CLOCK_MONOTONIC;
#else
CLOCK_REALTIME;
#endif
struct timespec now;
if (clock_gettime(clock_id, &now)) {
/* Fall back to realtime clock if monotonic doesn't work */
if (clock_id != CLOCK_REALTIME && errno == EINVAL) {
clock_id = CLOCK_REALTIME;
clock_gettime(clock_id, &now);
}
}
const long end_nsec = now.tv_nsec + usecs * 1000L;
const struct timespec end = {
end_nsec / (1000 * 1000 * 1000) + now.tv_sec,
end_nsec % (1000 * 1000 * 1000)
};
do {
clock_gettime(clock_id, &now);
} while (now.tv_sec < end.tv_sec || (now.tv_sec == end.tv_sec && now.tv_nsec < end.tv_nsec));
}
#else
static void clock_usec_delay(unsigned int usecs) {
struct timeval start, end;
unsigned long elapsed = 0;
gettimeofday(&start, NULL);
while (elapsed < usecs) {
gettimeofday(&end, NULL);
elapsed = 1000000 * (end.tv_sec - start.tv_sec) +
(end.tv_usec - start.tv_usec);
/* Protect against time going forward too much. */
if ((end.tv_sec > start.tv_sec) &&
((end.tv_sec - start.tv_sec) >= LONG_MAX / 1000000 - 1))
elapsed = 0;
/* Protect against time going backwards during leap seconds. */
if ((end.tv_sec < start.tv_sec) || (elapsed > LONG_MAX))
elapsed = 0;
}
}
#endif /* HAVE_CLOCK_GETTIME == 1 */
/* Not very precise sleep. */
void internal_sleep(unsigned int usecs)
{
#if IS_WINDOWS
Sleep((usecs + 999) / 1000);
#else
nanosleep(&(struct timespec){usecs / 1000000, (usecs * 1000) % 1000000000UL}, NULL);
#endif
}
static const unsigned min_sleep = CONFIG_DELAY_MINIMUM_SLEEP_US;
/* Precise delay. */
void default_delay(unsigned int usecs)
{
if (usecs < min_sleep) {
clock_usec_delay(usecs);
} else {
internal_sleep(usecs);
}
}
#else
#include <libpayload.h>
void default_delay(unsigned int usecs)
{
udelay(usecs);
}
#endif

174
platform/udelay_dos.c Normal file
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@ -0,0 +1,174 @@
/*
* This file is part of the flashrom project.
*
* Copyright (C) 2000 Silicon Integrated System Corporation
* Copyright (C) 2009,2010 Carl-Daniel Hailfinger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "platform/udelay.h"
#include <stdbool.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <stdlib.h>
#include <limits.h>
#include "flash.h"
#include "programmer.h"
/* loops per microsecond */
static unsigned long micro = 1;
__attribute__ ((noinline)) static void myusec_delay(unsigned int usecs)
{
unsigned long i;
for (i = 0; i < usecs * micro; i++) {
/* Make sure the compiler doesn't optimize the loop away. */
__asm__ volatile ("" : : "rm" (i) );
}
}
static unsigned long measure_os_delay_resolution(void)
{
unsigned long timeusec;
struct timeval start, end;
unsigned long counter = 0;
gettimeofday(&start, NULL);
timeusec = 0;
while (!timeusec && (++counter < 1000000000)) {
gettimeofday(&end, NULL);
timeusec = 1000000 * (end.tv_sec - start.tv_sec) +
(end.tv_usec - start.tv_usec);
/* Protect against time going forward too much. */
if ((end.tv_sec > start.tv_sec) &&
((end.tv_sec - start.tv_sec) >= LONG_MAX / 1000000 - 1))
timeusec = 0;
/* Protect against time going backwards during leap seconds. */
if ((end.tv_sec < start.tv_sec) || (timeusec > LONG_MAX))
timeusec = 0;
}
return timeusec;
}
static unsigned long measure_delay(unsigned int usecs)
{
unsigned long timeusec;
struct timeval start, end;
gettimeofday(&start, NULL);
myusec_delay(usecs);
gettimeofday(&end, NULL);
timeusec = 1000000 * (end.tv_sec - start.tv_sec) +
(end.tv_usec - start.tv_usec);
/* Protect against time going forward too much. */
if ((end.tv_sec > start.tv_sec) &&
((end.tv_sec - start.tv_sec) >= LONG_MAX / 1000000 - 1))
timeusec = LONG_MAX;
/* Protect against time going backwards during leap seconds. */
if ((end.tv_sec < start.tv_sec) || (timeusec > LONG_MAX))
timeusec = 1;
return timeusec;
}
static void myusec_calibrate_delay(void)
{
unsigned long count = 1000;
unsigned long timeusec, resolution;
int i, tries = 0;
msg_pinfo("Calibrating delay loop... ");
/* Timing resolution on DJGPP is about 50ms, but measure it precisely. */
resolution = measure_os_delay_resolution();
if (resolution) {
msg_pdbg("OS timer resolution is %lu usecs, ", resolution);
} else {
msg_pinfo("OS timer resolution is unusable. ");
}
recalibrate:
count = 1000;
while (1) {
timeusec = measure_delay(count);
if (timeusec > 1000000 / 4)
break;
if (count >= ULONG_MAX / 2) {
msg_pinfo("timer loop overflow, reduced precision. ");
break;
}
count *= 2;
}
tries ++;
/* Avoid division by zero, but in that case the loop is shot anyway. */
if (!timeusec)
timeusec = 1;
/* Compute rounded up number of loops per microsecond. */
micro = (count * micro) / timeusec + 1;
msg_pdbg("%luM loops per second, ", micro);
/* Did we try to recalibrate less than 5 times? */
if (tries < 5) {
/* Recheck our timing to make sure we weren't just hitting
* a scheduler delay or something similar.
*/
for (i = 0; i < 4; i++) {
timeusec = measure_delay(resolution * 10) *
100 / (resolution * 10);
if (timeusec < 90) {
msg_pdbg("delay more than 10%% too short (got "
"%lu%% of expected delay), "
"recalculating... ", timeusec);
goto recalibrate;
}
}
} else {
msg_perr("delay loop is unreliable, trying to continue ");
}
/* We're interested in the actual precision. */
timeusec = measure_delay(resolution * 4);
msg_pdbg("%ld myus = %ld us, ", resolution * 4, timeusec);
msg_pinfo("OK.\n");
}
/* Not very precise sleep. */
void internal_sleep(unsigned int usecs)
{
sleep(usecs / 1000000);
usleep(usecs % 1000000);
}
static const unsigned min_sleep = CONFIG_DELAY_MINIMUM_SLEEP_US;
/* Precise delay. */
void default_delay(unsigned int usecs)
{
static bool calibrated = false;
if (usecs < min_sleep) {
if (!calibrated) {
myusec_calibrate_delay();
calibrated = true;
}
myusec_delay(usecs);
} else {
internal_sleep(usecs);
}
}