root / hw / mac_nvram.c @ 8c9d7f83
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1 | 3cbee15b | j_mayer | /*
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2 | 3cbee15b | j_mayer | * PowerMac NVRAM emulation
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3 | 3cbee15b | j_mayer | *
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4 | 3cbee15b | j_mayer | * Copyright (c) 2005-2007 Fabrice Bellard
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5 | 3cbee15b | j_mayer | * Copyright (c) 2007 Jocelyn Mayer
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6 | 3cbee15b | j_mayer | *
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7 | 3cbee15b | j_mayer | * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 | 3cbee15b | j_mayer | * of this software and associated documentation files (the "Software"), to deal
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9 | 3cbee15b | j_mayer | * in the Software without restriction, including without limitation the rights
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10 | 3cbee15b | j_mayer | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 | 3cbee15b | j_mayer | * copies of the Software, and to permit persons to whom the Software is
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12 | 3cbee15b | j_mayer | * furnished to do so, subject to the following conditions:
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13 | 3cbee15b | j_mayer | *
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14 | 3cbee15b | j_mayer | * The above copyright notice and this permission notice shall be included in
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15 | 3cbee15b | j_mayer | * all copies or substantial portions of the Software.
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16 | 3cbee15b | j_mayer | *
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17 | 3cbee15b | j_mayer | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 | 3cbee15b | j_mayer | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 | 3cbee15b | j_mayer | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 | 3cbee15b | j_mayer | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 | 3cbee15b | j_mayer | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 | 3cbee15b | j_mayer | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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23 | 3cbee15b | j_mayer | * THE SOFTWARE.
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24 | 3cbee15b | j_mayer | */
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25 | 3cbee15b | j_mayer | #include "vl.h" |
26 | 3cbee15b | j_mayer | #include "ppc_mac.h" |
27 | 3cbee15b | j_mayer | |
28 | 3cbee15b | j_mayer | struct MacIONVRAMState {
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29 | 3cbee15b | j_mayer | uint8_t data[0x2000];
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30 | 3cbee15b | j_mayer | }; |
31 | 3cbee15b | j_mayer | |
32 | 3cbee15b | j_mayer | /* Direct access to NVRAM */
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33 | 3cbee15b | j_mayer | uint32_t macio_nvram_read (void *opaque, uint32_t addr)
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34 | 3cbee15b | j_mayer | { |
35 | 3cbee15b | j_mayer | MacIONVRAMState *s = opaque; |
36 | 3cbee15b | j_mayer | uint32_t ret; |
37 | 3cbee15b | j_mayer | |
38 | 3cbee15b | j_mayer | // printf("%s: %p addr %04x\n", __func__, s, addr);
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39 | 3cbee15b | j_mayer | if (addr < 0x2000) |
40 | 3cbee15b | j_mayer | ret = s->data[addr]; |
41 | 3cbee15b | j_mayer | else
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42 | 3cbee15b | j_mayer | ret = -1;
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43 | 3cbee15b | j_mayer | |
44 | 3cbee15b | j_mayer | return ret;
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45 | 3cbee15b | j_mayer | } |
46 | 3cbee15b | j_mayer | |
47 | 3cbee15b | j_mayer | void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val) |
48 | 3cbee15b | j_mayer | { |
49 | 3cbee15b | j_mayer | MacIONVRAMState *s = opaque; |
50 | 3cbee15b | j_mayer | |
51 | 3cbee15b | j_mayer | // printf("%s: %p addr %04x val %02x\n", __func__, s, addr, val);
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52 | 3cbee15b | j_mayer | if (addr < 0x2000) |
53 | 3cbee15b | j_mayer | s->data[addr] = val; |
54 | 3cbee15b | j_mayer | } |
55 | 3cbee15b | j_mayer | |
56 | 3cbee15b | j_mayer | /* macio style NVRAM device */
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57 | 3cbee15b | j_mayer | static void macio_nvram_writeb (void *opaque, |
58 | 3cbee15b | j_mayer | target_phys_addr_t addr, uint32_t value) |
59 | 3cbee15b | j_mayer | { |
60 | 3cbee15b | j_mayer | MacIONVRAMState *s = opaque; |
61 | 3cbee15b | j_mayer | addr = (addr >> 4) & 0x1fff; |
62 | 3cbee15b | j_mayer | s->data[addr] = value; |
63 | 3cbee15b | j_mayer | // printf("macio_nvram_writeb %04x = %02x\n", addr, value);
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64 | 3cbee15b | j_mayer | } |
65 | 3cbee15b | j_mayer | |
66 | 3cbee15b | j_mayer | static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr) |
67 | 3cbee15b | j_mayer | { |
68 | 3cbee15b | j_mayer | MacIONVRAMState *s = opaque; |
69 | 3cbee15b | j_mayer | uint32_t value; |
70 | 3cbee15b | j_mayer | |
71 | 3cbee15b | j_mayer | addr = (addr >> 4) & 0x1fff; |
72 | 3cbee15b | j_mayer | value = s->data[addr]; |
73 | 3cbee15b | j_mayer | // printf("macio_nvram_readb %04x = %02x\n", addr, value);
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74 | 3cbee15b | j_mayer | |
75 | 3cbee15b | j_mayer | return value;
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76 | 3cbee15b | j_mayer | } |
77 | 3cbee15b | j_mayer | |
78 | 3cbee15b | j_mayer | static CPUWriteMemoryFunc *nvram_write[] = {
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79 | 3cbee15b | j_mayer | &macio_nvram_writeb, |
80 | 3cbee15b | j_mayer | &macio_nvram_writeb, |
81 | 3cbee15b | j_mayer | &macio_nvram_writeb, |
82 | 3cbee15b | j_mayer | }; |
83 | 3cbee15b | j_mayer | |
84 | 3cbee15b | j_mayer | static CPUReadMemoryFunc *nvram_read[] = {
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85 | 3cbee15b | j_mayer | &macio_nvram_readb, |
86 | 3cbee15b | j_mayer | &macio_nvram_readb, |
87 | 3cbee15b | j_mayer | &macio_nvram_readb, |
88 | 3cbee15b | j_mayer | }; |
89 | 3cbee15b | j_mayer | |
90 | 3cbee15b | j_mayer | MacIONVRAMState *macio_nvram_init (int *mem_index)
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91 | 3cbee15b | j_mayer | { |
92 | 3cbee15b | j_mayer | MacIONVRAMState *s; |
93 | 3cbee15b | j_mayer | s = qemu_mallocz(sizeof(MacIONVRAMState));
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94 | 3cbee15b | j_mayer | if (!s)
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95 | 3cbee15b | j_mayer | return NULL; |
96 | 3cbee15b | j_mayer | *mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
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97 | 3cbee15b | j_mayer | |
98 | 3cbee15b | j_mayer | return s;
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99 | 3cbee15b | j_mayer | } |
100 | 3cbee15b | j_mayer | |
101 | 3cbee15b | j_mayer | static uint8_t nvram_chksum (const uint8_t *buf, int n) |
102 | 3cbee15b | j_mayer | { |
103 | 3cbee15b | j_mayer | int sum, i;
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104 | 3cbee15b | j_mayer | sum = 0;
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105 | 3cbee15b | j_mayer | for(i = 0; i < n; i++) |
106 | 3cbee15b | j_mayer | sum += buf[i]; |
107 | 3cbee15b | j_mayer | return (sum & 0xff) + (sum >> 8); |
108 | 3cbee15b | j_mayer | } |
109 | 3cbee15b | j_mayer | |
110 | 3cbee15b | j_mayer | /* set a free Mac OS NVRAM partition */
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111 | 3cbee15b | j_mayer | void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len) |
112 | 3cbee15b | j_mayer | { |
113 | 3cbee15b | j_mayer | uint8_t *buf; |
114 | 3cbee15b | j_mayer | char partition_name[12] = "wwwwwwwwwwww"; |
115 | 3cbee15b | j_mayer | |
116 | 3cbee15b | j_mayer | buf = nvr->data; |
117 | 3cbee15b | j_mayer | buf[0] = 0x7f; /* free partition magic */ |
118 | 3cbee15b | j_mayer | buf[1] = 0; /* checksum */ |
119 | 3cbee15b | j_mayer | buf[2] = len >> 8; |
120 | 3cbee15b | j_mayer | buf[3] = len;
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121 | 3cbee15b | j_mayer | memcpy(buf + 4, partition_name, 12); |
122 | 3cbee15b | j_mayer | buf[1] = nvram_chksum(buf, 16); |
123 | 3cbee15b | j_mayer | } |