/* * Copyright 2004-2007, Axel Dörfler, axeld@pinc-software.de. All rights reserved. * Copyright 2003, Jeff Ward, jeff@r2d2.stcloudstate.edu. All rights reserved. * * Distributed under the terms of the MIT License. */ #include #include #include #include #include #include #include #include //#define TRACE_TIME #ifdef TRACE_TIME # define TRACE(x) dprintf x #else # define TRACE(x) #endif #define RTC_SECONDS_DAY 86400 #define RTC_EPOCH_JULIAN_DAY 2440588 // January 1st, 1970 static struct real_time_data *sRealTimeData; static bool sIsGMT = false; static char sTimezoneFilename[B_PATH_NAME_LENGTH] = ""; static bigtime_t sTimezoneOffset = 0; static bool sDaylightSavingTime = false; /*! Write the system time to CMOS. */ static void rtc_system_to_hw(void) { uint32 seconds; seconds = (arch_rtc_get_system_time_offset(sRealTimeData) + system_time() + (sIsGMT ? 0 : sTimezoneOffset)) / 1000000; arch_rtc_set_hw_time(seconds); } /*! Read the CMOS clock and update the system time accordingly. */ static void rtc_hw_to_system(void) { uint32 current_time; current_time = arch_rtc_get_hw_time(); set_real_time_clock(current_time + (sIsGMT ? 0 : sTimezoneOffset)); } bigtime_t rtc_boot_time(void) { return arch_rtc_get_system_time_offset(sRealTimeData); } static int rtc_debug(int argc, char **argv) { if (argc < 2) { // If no arguments were given, output all useful data. uint32 currentTime; bigtime_t systemTimeOffset = arch_rtc_get_system_time_offset(sRealTimeData); currentTime = (systemTimeOffset + system_time()) / 1000000; dprintf("system_time: %Ld\n", system_time()); dprintf("system_time_offset: %Ld\n", systemTimeOffset); dprintf("current_time: %lu\n", currentTime); } else { // If there was an argument, reset the system and hw time. set_real_time_clock(strtoul(argv[1], NULL, 10)); } return 0; } status_t rtc_init(kernel_args *args) { sRealTimeData = (struct real_time_data*)allocate_commpage_entry( COMMPAGE_ENTRY_REAL_TIME_DATA, sizeof(struct real_time_data)); arch_rtc_init(args, sRealTimeData); rtc_hw_to_system(); add_debugger_command("rtc", &rtc_debug, "Set and test the real-time clock"); return B_OK; } // #pragma mark - public kernel API void set_real_time_clock(uint32 currentTime) { arch_rtc_set_system_time_offset(sRealTimeData, currentTime * 1000000LL - system_time()); rtc_system_to_hw(); } uint32 real_time_clock(void) { return (arch_rtc_get_system_time_offset(sRealTimeData) + system_time()) / 1000000; } bigtime_t real_time_clock_usecs(void) { return arch_rtc_get_system_time_offset(sRealTimeData) + system_time(); } status_t get_rtc_info(rtc_info *info) { if (info == NULL) return B_BAD_VALUE; info->time = real_time_clock(); info->is_gmt = sIsGMT; info->tz_minuteswest = sTimezoneOffset / 1000000LL; info->tz_dsttime = sDaylightSavingTime; return B_OK; } // #pragma mark - /*! Converts the \a tm data to seconds. Note that the base year is not 1900 as in POSIX, but 1970. */ uint32 rtc_tm_to_secs(const struct tm *tm) { uint32 days; int year, month; month = tm->tm_mon + 1; year = tm->tm_year + RTC_EPOCH_BASE_YEAR; // Reference: Fliegel, H. F. and van Flandern, T. C. (1968). // Communications of the ACM, Vol. 11, No. 10 (October, 1968). days = tm->tm_mday - 32075 - RTC_EPOCH_JULIAN_DAY + 1461 * (year + 4800 + (month - 14) / 12) / 4 + 367 * (month - 2 - 12 * ((month - 14) / 12)) / 12 - 3 * ((year + 4900 + (month - 14) / 12) / 100) / 4; return days * RTC_SECONDS_DAY + tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec; } void rtc_secs_to_tm(uint32 seconds, struct tm *t) { uint32 year, month, day, l, n; // Reference: Fliegel, H. F. and van Flandern, T. C. (1968). // Communications of the ACM, Vol. 11, No. 10 (October, 1968). l = seconds / 86400 + 68569 + RTC_EPOCH_JULIAN_DAY; n = 4 * l / 146097; l = l - (146097 * n + 3) / 4; year = 4000 * (l + 1) / 1461001; l = l - 1461 * year / 4 + 31; month = 80 * l / 2447; day = l - 2447 * month / 80; l = month / 11; month = month + 2 - 12 * l; year = 100 * (n - 49) + year + l; t->tm_mday = day; t->tm_mon = month - 1; t->tm_year = year - RTC_EPOCH_BASE_YEAR; seconds = seconds % RTC_SECONDS_DAY; t->tm_hour = seconds / 3600; seconds = seconds % 3600; t->tm_min = seconds / 60; t->tm_sec = seconds % 60; } // #pragma mark - /*! This is called from the gettimeofday() implementation that's part of the kernel. */ status_t _kern_get_timezone(time_t *_timezoneOffset, bool *_daylightSavingTime) { *_timezoneOffset = (time_t)(sTimezoneOffset / 1000000LL); *_daylightSavingTime = sDaylightSavingTime; return B_OK; } // #pragma mark - syscalls bigtime_t _user_system_time(void) { syscall_64_bit_return_value(); return system_time(); } status_t _user_set_real_time_clock(uint32 time) { if (geteuid() != 0) return B_NOT_ALLOWED; set_real_time_clock(time); return B_OK; } status_t _user_set_timezone(time_t timezoneOffset, bool daylightSavingTime) { bigtime_t offset = (bigtime_t)timezoneOffset * 1000000LL; if (geteuid() != 0) return B_NOT_ALLOWED; TRACE(("old system_time_offset %Ld old %Ld new %Ld gmt %d\n", arch_rtc_get_system_time_offset(sRealTimeData), sTimezoneOffset, offset, sIsGMT)); // We only need to update our time offset if the hardware clock // does not run in the local timezone. // Since this is shared data, we need to update it atomically. if (!sIsGMT) { arch_rtc_set_system_time_offset(sRealTimeData, arch_rtc_get_system_time_offset(sRealTimeData) + sTimezoneOffset - offset); } sTimezoneOffset = offset; sDaylightSavingTime = daylightSavingTime; TRACE(("new system_time_offset %Ld\n", arch_rtc_get_system_time_offset(sRealTimeData))); return B_OK; } status_t _user_get_timezone(time_t *_timezoneOffset, bool *_daylightSavingTime) { time_t offset = (time_t)(sTimezoneOffset / 1000000LL); if (!IS_USER_ADDRESS(_timezoneOffset) || !IS_USER_ADDRESS(_daylightSavingTime) || user_memcpy(_timezoneOffset, &offset, sizeof(time_t)) < B_OK || user_memcpy(_daylightSavingTime, &sDaylightSavingTime, sizeof(bool)) < B_OK) return B_BAD_ADDRESS; return B_OK; } status_t _user_set_tzfilename(const char *filename, size_t length, bool isGMT) { // store previous value bool wasGMT = sIsGMT; if (geteuid() != 0) return B_NOT_ALLOWED; if (!IS_USER_ADDRESS(filename) || filename == NULL || user_strlcpy(sTimezoneFilename, filename, B_PATH_NAME_LENGTH) < B_OK) return B_BAD_ADDRESS; sIsGMT = isGMT; if (wasGMT != sIsGMT) arch_rtc_set_system_time_offset(sRealTimeData, arch_rtc_get_system_time_offset(sRealTimeData) + (((sIsGMT) ? 1 : -1) * sTimezoneOffset)); return B_OK; } status_t _user_get_tzfilename(char *filename, size_t length, bool *_isGMT) { if (filename == NULL || _isGMT == NULL || !IS_USER_ADDRESS(filename) || !IS_USER_ADDRESS(_isGMT) || user_strlcpy(filename, sTimezoneFilename, length) < B_OK || user_memcpy(_isGMT, &sIsGMT, sizeof(bool)) < B_OK) return B_BAD_ADDRESS; return B_OK; }