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 | #include "qemu/timer.h" |
29 | |
30 | #define RTC_ISA_IRQ 8 |
31 | |
32 | #define RTC_SECONDS 0 |
33 | #define RTC_SECONDS_ALARM 1 |
34 | #define RTC_MINUTES 2 |
35 | #define RTC_MINUTES_ALARM 3 |
36 | #define RTC_HOURS 4 |
37 | #define RTC_HOURS_ALARM 5 |
38 | #define RTC_ALARM_DONT_CARE 0xC0 |
39 | |
40 | #define RTC_DAY_OF_WEEK 6 |
41 | #define RTC_DAY_OF_MONTH 7 |
42 | #define RTC_MONTH 8 |
43 | #define RTC_YEAR 9 |
44 | |
45 | #define RTC_REG_A 10 |
46 | #define RTC_REG_B 11 |
47 | #define RTC_REG_C 12 |
48 | #define RTC_REG_D 13 |
49 | |
50 | /* PC cmos mappings */ |
51 | #define RTC_CENTURY 0x32 |
52 | #define RTC_IBM_PS2_CENTURY_BYTE 0x37 |
53 | |
54 | #define REG_A_UIP 0x80 |
55 | |
56 | #define REG_B_SET 0x80 |
57 | #define REG_B_PIE 0x40 |
58 | #define REG_B_AIE 0x20 |
59 | #define REG_B_UIE 0x10 |
60 | #define REG_B_SQWE 0x08 |
61 | #define REG_B_DM 0x04 |
62 | #define REG_B_24H 0x02 |
63 | |
64 | #define REG_C_UF 0x10 |
65 | #define REG_C_IRQF 0x80 |
66 | #define REG_C_PF 0x40 |
67 | #define REG_C_AF 0x20 |
68 | #define REG_C_MASK 0x70 |
69 | |
70 | static inline uint32_t periodic_period_to_clock(int period_code) |
71 | { |
72 | if (!period_code) { |
73 | return 0; |
74 | } |
75 | |
76 | if (period_code <= 2) { |
77 | period_code += 7; |
78 | } |
79 | /* period in 32 Khz cycles */ |
80 | return 1 << (period_code - 1); |
81 | } |
82 | |
83 | #define RTC_CLOCK_RATE 32768 |
84 | |
85 | static inline int64_t periodic_clock_to_ns(int64_t clocks) |
86 | { |
87 | return muldiv64(clocks, NANOSECONDS_PER_SECOND, RTC_CLOCK_RATE); |
88 | } |
89 | |
90 | #endif |
91 | |