mc146818rtc_regs.h (2643B)
1 /* 2 * QEMU MC146818 RTC emulation 3 * 4 * Copyright (c) 2003-2004 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #ifndef HW_RTC_MC146818RTC_REGS_H 26 #define HW_RTC_MC146818RTC_REGS_H 27 28 #include "qemu/timer.h" 29 #include "qemu/host-utils.h" 30 31 #define RTC_SECONDS 0 32 #define RTC_SECONDS_ALARM 1 33 #define RTC_MINUTES 2 34 #define RTC_MINUTES_ALARM 3 35 #define RTC_HOURS 4 36 #define RTC_HOURS_ALARM 5 37 #define RTC_ALARM_DONT_CARE 0xC0 38 39 #define RTC_DAY_OF_WEEK 6 40 #define RTC_DAY_OF_MONTH 7 41 #define RTC_MONTH 8 42 #define RTC_YEAR 9 43 44 #define RTC_REG_A 10 45 #define RTC_REG_B 11 46 #define RTC_REG_C 12 47 #define RTC_REG_D 13 48 49 /* PC cmos mappings */ 50 #define RTC_CENTURY 0x32 51 #define RTC_IBM_PS2_CENTURY_BYTE 0x37 52 53 #define REG_A_UIP 0x80 54 55 #define REG_B_SET 0x80 56 #define REG_B_PIE 0x40 57 #define REG_B_AIE 0x20 58 #define REG_B_UIE 0x10 59 #define REG_B_SQWE 0x08 60 #define REG_B_DM 0x04 61 #define REG_B_24H 0x02 62 63 #define REG_C_UF 0x10 64 #define REG_C_IRQF 0x80 65 #define REG_C_PF 0x40 66 #define REG_C_AF 0x20 67 #define REG_C_MASK 0x70 68 69 static inline uint32_t periodic_period_to_clock(int period_code) 70 { 71 if (!period_code) { 72 return 0; 73 } 74 75 if (period_code <= 2) { 76 period_code += 7; 77 } 78 /* period in 32 Khz cycles */ 79 return 1 << (period_code - 1); 80 } 81 82 #define RTC_CLOCK_RATE 32768 83 84 static inline int64_t periodic_clock_to_ns(int64_t clocks) 85 { 86 return muldiv64(clocks, NANOSECONDS_PER_SECOND, RTC_CLOCK_RATE); 87 } 88 89 #endif