/* * This file is part of the libpayload project. * * 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> #ifdef CONFIG_TARGET_I386 #include <arch/rdtsc.h> #endif extern u32 cpu_khz; static struct { u64 ticks; time_t secs; suseconds_t usecs; } clock; #define TICKS_PER_SEC (cpu_khz * 1000) #define TICKS_PER_USEC (cpu_khz / 1000) #ifdef CONFIG_TARGET_I386 static void update_clock(void) { u64 delta = rdtsc() - clock.ticks; int secs; 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++; } } #ifdef CONFIG_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 = rdtsc(); } #endif #endif #ifdef CONFIG_TARGET_POWERPC static void update_clock(void) { } static void gettimeofday_init(void) { } #endif /** * Return the current time broken into a timeval structure. * * @param tv A pointer to a timeval structure. * @param tz Added for compatability - not used. * @return 0 for success (this function cannot return non-zero currently). */ int gettimeofday(struct timeval *tv, void *tz) { /* * 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(); tv->tv_sec = clock.secs; tv->tv_usec = clock.usecs; return 0; }