include/hw/timer/mc146818rtc_regs.h

   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 MC146818RTC_REGS_H
  26 #define MC146818RTC_REGS_H
  27
  28 #define RTC_ISA_IRQ 8
  29
  30 #define RTC_SECONDS             0
  31 #define RTC_SECONDS_ALARM       1
  32 #define RTC_MINUTES             2
  33 #define RTC_MINUTES_ALARM       3
  34 #define RTC_HOURS               4
  35 #define RTC_HOURS_ALARM         5
  36 #define RTC_ALARM_DONT_CARE    0xC0
  37
  38 #define RTC_DAY_OF_WEEK         6
  39 #define RTC_DAY_OF_MONTH        7
  40 #define RTC_MONTH               8
  41 #define RTC_YEAR                9
  42
  43 #define RTC_REG_A               10
  44 #define RTC_REG_B               11
  45 #define RTC_REG_C               12
  46 #define RTC_REG_D               13
  47
  48 /* PC cmos mappings */
  49 #define RTC_CENTURY              0x32
  50 #define RTC_IBM_PS2_CENTURY_BYTE 0x37
  51
  52 #define REG_A_UIP 0x80
  53
  54 #define REG_B_SET  0x80
  55 #define REG_B_PIE  0x40
  56 #define REG_B_AIE  0x20
  57 #define REG_B_UIE  0x10
  58 #define REG_B_SQWE 0x08
  59 #define REG_B_DM   0x04
  60 #define REG_B_24H  0x02
  61
  62 #define REG_C_UF   0x10
  63 #define REG_C_IRQF 0x80
  64 #define REG_C_PF   0x40
  65 #define REG_C_AF   0x20
  66 #define REG_C_MASK 0x70
  67
  68 static inline uint32_t periodic_period_to_clock(int period_code)
  69 {
  70     if (!period_code) {
  71         return 0;
  72    }
  73
  74     if (period_code <= 2) {
  75         period_code += 7;
  76     }
  77     /* period in 32 Khz cycles */
  78    return 1 << (period_code - 1);
  79 }
  80
  81 #define RTC_CLOCK_RATE            32768
  82
  83 static inline int64_t periodic_clock_to_ns(int64_t clocks)
  84 {
  85     return muldiv64(clocks, NANOSECONDS_PER_SECOND, RTC_CLOCK_RATE);
  86 }
  87
  88 #endif