include/hw/rtc/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 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