| /* |
| * |
| * Copyright (C) 2008 Advanced Micro Devices, Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| /** |
| * @file libc/time.c |
| * General time functions |
| */ |
| |
| #include <libpayload-config.h> |
| #include <libpayload.h> |
| #if CONFIG(LP_ARCH_X86) && CONFIG(LP_NVRAM) |
| #include <arch/rdtsc.h> |
| #endif |
| |
| extern u32 cpu_khz; |
| |
| static struct { |
| u64 ticks; |
| time_t secs; |
| suseconds_t usecs; |
| } clock; |
| |
| static void update_clock(void) |
| { |
| u64 delta = timer_raw_value() - clock.ticks; |
| int secs; |
| static uint64_t ticks_per_sec = 0; |
| static uint64_t ticks_per_usec = 0; |
| if (!ticks_per_sec) { |
| ticks_per_sec = timer_hz(); |
| ticks_per_usec = timer_hz() / 1000000; |
| } |
| |
| clock.ticks += delta; |
| |
| secs = (int) (delta / ticks_per_sec); |
| clock.secs += secs; |
| delta -= (secs * ticks_per_sec); |
| clock.usecs += (int)(delta / ticks_per_usec); |
| |
| if (clock.usecs > 1000000) { |
| clock.usecs -= 1000000; |
| clock.secs++; |
| } |
| } |
| |
| #if CONFIG(LP_NVRAM) |
| |
| static unsigned int day_of_year(int mon, int day, int year) |
| { |
| static u8 mdays[12] = { 31, 28, 31, 30, 31, 30, |
| 31, 31, 30, 31, 30, 31 }; |
| |
| int i, ret = 0; |
| |
| for(i = 0; i < mon; i++) { |
| ret += mdays[i]; |
| |
| if (i == 1 && (year % 4)) |
| ret++; |
| } |
| |
| return (ret + day); |
| } |
| |
| static void gettimeofday_init(void) |
| { |
| int days, delta; |
| struct tm tm; |
| |
| rtc_read_clock(&tm); |
| clock.ticks = rdtsc(); |
| |
| /* Calculate the number of days in the year so far */ |
| days = day_of_year(tm.tm_mon, tm.tm_mday, tm.tm_year + 1900); |
| |
| delta = tm.tm_year - 70; |
| |
| days += (delta * 365); |
| |
| /* Figure leap years */ |
| |
| if (delta > 2) |
| days += (delta - 2) / 4; |
| |
| clock.secs = (days * 86400) + (tm.tm_hour * 3600) + |
| (tm.tm_min * 60) + tm.tm_sec; |
| } |
| #else |
| static void gettimeofday_init(void) |
| { |
| /* Record the number of ticks */ |
| clock.ticks = timer_raw_value(); |
| } |
| #endif |
| |
| /** |
| * Return the current time expressed as seconds from 00:00:00 UTC, 1 Jan 1970. |
| * |
| * @param tp When not NULL, set this to the current time in seconds. |
| * @return The current time in seconds. |
| */ |
| time_t time(time_t *tp) |
| { |
| /* |
| * Call the gtod init when we need it - this keeps the code from |
| * being included in the binary if we don't need it. |
| */ |
| if (!clock.ticks) |
| gettimeofday_init(); |
| |
| update_clock(); |
| |
| if (tp) |
| *tp = clock.secs; |
| |
| return clock.secs; |
| } |
| |
| /** |
| * Return the current time broken into a timeval structure. |
| * |
| * @param tv A pointer to a timeval structure. |
| * @param tz Added for compatibility - not used. |
| * @return 0 for success (this function cannot return non-zero currently). |
| */ |
| int gettimeofday(struct timeval *tv, void *tz) |
| { |
| tv->tv_sec = time(NULL); |
| tv->tv_usec = clock.usecs; |
| |
| return 0; |
| } |
| |
| __attribute__((weak)) |
| void arch_ndelay(uint64_t ns) |
| { |
| uint64_t delta = ns * timer_hz() / NSECS_PER_SEC; |
| uint64_t start = timer_raw_value(); |
| while (timer_raw_value() - start < delta) ; |
| } |
| |
| u64 timer_us(u64 base) |
| { |
| static u64 hz; |
| |
| // Only check timer_hz once. Assume it doesn't change. |
| if (hz == 0) { |
| hz = timer_hz(); |
| if (hz < 1000000) { |
| printf("Timer frequency %lld is too low, " |
| "must be at least 1MHz.\n", hz); |
| halt(); |
| } |
| } |
| |
| return (1000000 * timer_raw_value()) / hz - base; |
| } |