1 | /* |
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2 | * QEMU MC146818 RTC emulation |
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3 | * |
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4 | * Copyright (c) 2003-2004 Fabrice Bellard |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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7 | * of this software and associated documentation files (the "Software"), to deal |
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8 | * in the Software without restriction, including without limitation the rights |
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9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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10 | * copies of the Software, and to permit persons to whom the Software is |
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11 | * furnished to do so, subject to the following conditions: |
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12 | * |
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13 | * The above copyright notice and this permission notice shall be included in |
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14 | * all copies or substantial portions of the Software. |
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15 | * |
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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22 | * THE SOFTWARE. |
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23 | */ |
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24 | |
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25 | #include "vl.h" |
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26 | |
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27 | //#define DEBUG_CMOS |
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28 | |
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29 | struct RTCState { |
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30 | uint8_t cmos_data[128]; |
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31 | uint8_t cmos_index; |
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32 | }; |
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33 | |
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34 | void rtc_set_memory(RTCState *s, int addr, int val) |
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35 | { |
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36 | if (addr >= 0 && addr <= 127) |
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37 | s->cmos_data[addr] = val; |
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38 | } |
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39 | |
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40 | static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data) |
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41 | { |
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42 | RTCState *s = opaque; |
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43 | |
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44 | if ((addr & 1) == 0) { |
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45 | s->cmos_index = data & 0x7f; |
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46 | } else { |
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47 | #ifdef DEBUG_CMOS |
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48 | printf("cmos: write index=0x%02x val=0x%02x\n", |
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49 | s->cmos_index, data); |
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50 | #endif |
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51 | s->cmos_data[s->cmos_index] = data; |
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52 | } |
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53 | } |
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54 | |
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55 | static uint32_t cmos_ioport_read(void *opaque, uint32_t addr) |
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56 | { |
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57 | RTCState *s = opaque; |
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58 | int ret; |
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59 | if ((addr & 1) == 0) { |
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60 | return 0xff; |
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61 | } else { |
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62 | ret = s->cmos_data[s->cmos_index]; |
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63 | #ifdef DEBUG_CMOS |
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64 | printf("cmos: read index=0x%02x val=0x%02x\n", |
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65 | s->cmos_index, ret); |
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66 | #endif |
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67 | return ret; |
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68 | } |
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69 | } |
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70 | |
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71 | static void rtc_save(QEMUFile *f, void *opaque) |
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72 | { |
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73 | RTCState *s = opaque; |
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74 | |
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75 | qemu_put_buffer(f, s->cmos_data, 128); |
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76 | qemu_put_8s(f, &s->cmos_index); |
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77 | } |
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78 | |
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79 | static int rtc_load(QEMUFile *f, void *opaque, int version_id) |
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80 | { |
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81 | RTCState *s = opaque; |
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82 | |
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83 | if (version_id != 1) |
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84 | return -EINVAL; |
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85 | |
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86 | qemu_get_buffer(f, s->cmos_data, 128); |
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87 | qemu_get_8s(f, &s->cmos_index); |
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88 | |
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89 | return 0; |
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90 | } |
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91 | |
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92 | RTCState *rtc_init(int base, int irq) |
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93 | { |
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94 | RTCState *s; |
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95 | |
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96 | s = qemu_mallocz(sizeof(RTCState)); |
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97 | if (!s) |
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98 | return NULL; |
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99 | |
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100 | register_ioport_write(base, 2, 1, cmos_ioport_write, s); |
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101 | register_ioport_read(base, 2, 1, cmos_ioport_read, s); |
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102 | |
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103 | register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s); |
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104 | return s; |
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105 | } |
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106 | |
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107 | void rtc_set_date(RTCState *s, const struct tm *tm) {} |
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