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fd94be7a AL |
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 | */ | |
121d0712 MA |
24 | |
25 | #ifndef MC146818RTC_REGS_H | |
26 | #define MC146818RTC_REGS_H | |
fd94be7a | 27 | |
ec150c7e MA |
28 | #include "qemu/timer.h" |
29 | ||
fd94be7a AL |
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 | ||
e67edb94 PB |
50 | /* PC cmos mappings */ |
51 | #define RTC_CENTURY 0x32 | |
52 | #define RTC_IBM_PS2_CENTURY_BYTE 0x37 | |
53 | ||
fd94be7a AL |
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 | |
9324cc50 | 68 | #define REG_C_MASK 0x70 |
fd94be7a | 69 | |
bd618eab XG |
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 | ||
fd94be7a | 90 | #endif |