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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" |
3cbee15b JM |
26 | #include "ppc_mac.h" |
27 | ||
ea026b2f BS |
28 | /* debug NVR */ |
29 | //#define DEBUG_NVR | |
30 | ||
31 | #ifdef DEBUG_NVR | |
32 | #define NVR_DPRINTF(fmt, args...) \ | |
33 | do { printf("NVR: " fmt , ##args); } while (0) | |
34 | #else | |
35 | #define NVR_DPRINTF(fmt, args...) | |
36 | #endif | |
37 | ||
3cbee15b | 38 | struct MacIONVRAMState { |
74e91155 JM |
39 | target_phys_addr_t size; |
40 | int mem_index; | |
3cbee15b JM |
41 | uint8_t data[0x2000]; |
42 | }; | |
43 | ||
44 | /* Direct access to NVRAM */ | |
45 | uint32_t macio_nvram_read (void *opaque, uint32_t addr) | |
46 | { | |
47 | MacIONVRAMState *s = opaque; | |
48 | uint32_t ret; | |
49 | ||
3cbee15b JM |
50 | if (addr < 0x2000) |
51 | ret = s->data[addr]; | |
52 | else | |
53 | ret = -1; | |
ea026b2f | 54 | NVR_DPRINTF("read addr %04x val %x\n", addr, ret); |
3cbee15b JM |
55 | |
56 | return ret; | |
57 | } | |
58 | ||
59 | void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val) | |
60 | { | |
61 | MacIONVRAMState *s = opaque; | |
62 | ||
ea026b2f | 63 | NVR_DPRINTF("write addr %04x val %x\n", addr, val); |
3cbee15b JM |
64 | if (addr < 0x2000) |
65 | s->data[addr] = val; | |
66 | } | |
67 | ||
68 | /* macio style NVRAM device */ | |
69 | static void macio_nvram_writeb (void *opaque, | |
70 | target_phys_addr_t addr, uint32_t value) | |
71 | { | |
72 | MacIONVRAMState *s = opaque; | |
74e91155 | 73 | |
3cbee15b JM |
74 | addr = (addr >> 4) & 0x1fff; |
75 | s->data[addr] = value; | |
ea026b2f | 76 | NVR_DPRINTF("writeb addr %04x val %x\n", (int)addr, value); |
3cbee15b JM |
77 | } |
78 | ||
79 | static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr) | |
80 | { | |
81 | MacIONVRAMState *s = opaque; | |
82 | uint32_t value; | |
83 | ||
84 | addr = (addr >> 4) & 0x1fff; | |
85 | value = s->data[addr]; | |
ea026b2f | 86 | NVR_DPRINTF("readb addr %04x val %x\n", (int)addr, value); |
3cbee15b JM |
87 | |
88 | return value; | |
89 | } | |
90 | ||
91 | static CPUWriteMemoryFunc *nvram_write[] = { | |
92 | &macio_nvram_writeb, | |
93 | &macio_nvram_writeb, | |
94 | &macio_nvram_writeb, | |
95 | }; | |
96 | ||
97 | static CPUReadMemoryFunc *nvram_read[] = { | |
98 | &macio_nvram_readb, | |
99 | &macio_nvram_readb, | |
100 | &macio_nvram_readb, | |
101 | }; | |
102 | ||
74e91155 | 103 | MacIONVRAMState *macio_nvram_init (int *mem_index, target_phys_addr_t size) |
3cbee15b JM |
104 | { |
105 | MacIONVRAMState *s; | |
74e91155 | 106 | |
3cbee15b JM |
107 | s = qemu_mallocz(sizeof(MacIONVRAMState)); |
108 | if (!s) | |
109 | return NULL; | |
74e91155 JM |
110 | s->size = size; |
111 | s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s); | |
112 | *mem_index = s->mem_index; | |
3cbee15b JM |
113 | |
114 | return s; | |
115 | } | |
116 | ||
74e91155 JM |
117 | void macio_nvram_map (void *opaque, target_phys_addr_t mem_base) |
118 | { | |
119 | MacIONVRAMState *s; | |
120 | ||
121 | s = opaque; | |
74e91155 JM |
122 | cpu_register_physical_memory(mem_base, s->size, s->mem_index); |
123 | } | |
124 | ||
3cbee15b JM |
125 | static uint8_t nvram_chksum (const uint8_t *buf, int n) |
126 | { | |
127 | int sum, i; | |
128 | sum = 0; | |
129 | for(i = 0; i < n; i++) | |
130 | sum += buf[i]; | |
131 | return (sum & 0xff) + (sum >> 8); | |
132 | } | |
133 | ||
134 | /* set a free Mac OS NVRAM partition */ | |
135 | void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len) | |
136 | { | |
137 | uint8_t *buf; | |
138 | char partition_name[12] = "wwwwwwwwwwww"; | |
139 | ||
140 | buf = nvr->data; | |
141 | buf[0] = 0x7f; /* free partition magic */ | |
142 | buf[1] = 0; /* checksum */ | |
143 | buf[2] = len >> 8; | |
144 | buf[3] = len; | |
145 | memcpy(buf + 4, partition_name, 12); | |
146 | buf[1] = nvram_chksum(buf, 16); | |
147 | } |