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3cbee15b JM |
1 | /* |
2 | * PowerMac NVRAM emulation | |
3 | * | |
4 | * Copyright (c) 2005-2007 Fabrice Bellard | |
5 | * Copyright (c) 2007 Jocelyn Mayer | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
87ecb68b | 25 | #include "hw.h" |
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26 | #include "ppc_mac.h" |
27 | ||
28 | struct MacIONVRAMState { | |
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29 | target_phys_addr_t mem_base; |
30 | target_phys_addr_t size; | |
31 | int mem_index; | |
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32 | uint8_t data[0x2000]; |
33 | }; | |
34 | ||
35 | /* Direct access to NVRAM */ | |
36 | uint32_t macio_nvram_read (void *opaque, uint32_t addr) | |
37 | { | |
38 | MacIONVRAMState *s = opaque; | |
39 | uint32_t ret; | |
40 | ||
41 | // printf("%s: %p addr %04x\n", __func__, s, addr); | |
42 | if (addr < 0x2000) | |
43 | ret = s->data[addr]; | |
44 | else | |
45 | ret = -1; | |
46 | ||
47 | return ret; | |
48 | } | |
49 | ||
50 | void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val) | |
51 | { | |
52 | MacIONVRAMState *s = opaque; | |
53 | ||
54 | // printf("%s: %p addr %04x val %02x\n", __func__, s, addr, val); | |
55 | if (addr < 0x2000) | |
56 | s->data[addr] = val; | |
57 | } | |
58 | ||
59 | /* macio style NVRAM device */ | |
60 | static void macio_nvram_writeb (void *opaque, | |
61 | target_phys_addr_t addr, uint32_t value) | |
62 | { | |
63 | MacIONVRAMState *s = opaque; | |
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64 | |
65 | addr -= s->mem_base; | |
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66 | addr = (addr >> 4) & 0x1fff; |
67 | s->data[addr] = value; | |
68 | // printf("macio_nvram_writeb %04x = %02x\n", addr, value); | |
69 | } | |
70 | ||
71 | static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr) | |
72 | { | |
73 | MacIONVRAMState *s = opaque; | |
74 | uint32_t value; | |
75 | ||
74e91155 | 76 | addr -= s->mem_base; |
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77 | addr = (addr >> 4) & 0x1fff; |
78 | value = s->data[addr]; | |
79 | // printf("macio_nvram_readb %04x = %02x\n", addr, value); | |
80 | ||
81 | return value; | |
82 | } | |
83 | ||
84 | static CPUWriteMemoryFunc *nvram_write[] = { | |
85 | &macio_nvram_writeb, | |
86 | &macio_nvram_writeb, | |
87 | &macio_nvram_writeb, | |
88 | }; | |
89 | ||
90 | static CPUReadMemoryFunc *nvram_read[] = { | |
91 | &macio_nvram_readb, | |
92 | &macio_nvram_readb, | |
93 | &macio_nvram_readb, | |
94 | }; | |
95 | ||
74e91155 | 96 | MacIONVRAMState *macio_nvram_init (int *mem_index, target_phys_addr_t size) |
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97 | { |
98 | MacIONVRAMState *s; | |
74e91155 | 99 | |
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100 | s = qemu_mallocz(sizeof(MacIONVRAMState)); |
101 | if (!s) | |
102 | return NULL; | |
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103 | s->size = size; |
104 | s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s); | |
105 | *mem_index = s->mem_index; | |
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106 | |
107 | return s; | |
108 | } | |
109 | ||
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110 | void macio_nvram_map (void *opaque, target_phys_addr_t mem_base) |
111 | { | |
112 | MacIONVRAMState *s; | |
113 | ||
114 | s = opaque; | |
115 | s->mem_base = mem_base; | |
116 | cpu_register_physical_memory(mem_base, s->size, s->mem_index); | |
117 | } | |
118 | ||
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119 | static uint8_t nvram_chksum (const uint8_t *buf, int n) |
120 | { | |
121 | int sum, i; | |
122 | sum = 0; | |
123 | for(i = 0; i < n; i++) | |
124 | sum += buf[i]; | |
125 | return (sum & 0xff) + (sum >> 8); | |
126 | } | |
127 | ||
128 | /* set a free Mac OS NVRAM partition */ | |
129 | void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len) | |
130 | { | |
131 | uint8_t *buf; | |
132 | char partition_name[12] = "wwwwwwwwwwww"; | |
133 | ||
134 | buf = nvr->data; | |
135 | buf[0] = 0x7f; /* free partition magic */ | |
136 | buf[1] = 0; /* checksum */ | |
137 | buf[2] = len >> 8; | |
138 | buf[3] = len; | |
139 | memcpy(buf + 4, partition_name, 12); | |
140 | buf[1] = nvram_chksum(buf, 16); | |
141 | } |