/* * QEMU MC146818 RTC emulation * * Copyright (c) 2003-2004 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #ifndef MC146818RTC_REGS_H #define MC146818RTC_REGS_H #include "qemu/timer.h" #define RTC_ISA_IRQ 8 #define RTC_SECONDS 0 #define RTC_SECONDS_ALARM 1 #define RTC_MINUTES 2 #define RTC_MINUTES_ALARM 3 #define RTC_HOURS 4 #define RTC_HOURS_ALARM 5 #define RTC_ALARM_DONT_CARE 0xC0 #define RTC_DAY_OF_WEEK 6 #define RTC_DAY_OF_MONTH 7 #define RTC_MONTH 8 #define RTC_YEAR 9 #define RTC_REG_A 10 #define RTC_REG_B 11 #define RTC_REG_C 12 #define RTC_REG_D 13 /* PC cmos mappings */ #define RTC_CENTURY 0x32 #define RTC_IBM_PS2_CENTURY_BYTE 0x37 #define REG_A_UIP 0x80 #define REG_B_SET 0x80 #define REG_B_PIE 0x40 #define REG_B_AIE 0x20 #define REG_B_UIE 0x10 #define REG_B_SQWE 0x08 #define REG_B_DM 0x04 #define REG_B_24H 0x02 #define REG_C_UF 0x10 #define REG_C_IRQF 0x80 #define REG_C_PF 0x40 #define REG_C_AF 0x20 #define REG_C_MASK 0x70 static inline uint32_t periodic_period_to_clock(int period_code) { if (!period_code) { return 0; } if (period_code <= 2) { period_code += 7; } /* period in 32 Khz cycles */ return 1 << (period_code - 1); } #define RTC_CLOCK_RATE 32768 static inline int64_t periodic_clock_to_ns(int64_t clocks) { return muldiv64(clocks, NANOSECONDS_PER_SECOND, RTC_CLOCK_RATE); } #endif