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39795f9c DW |
1 | /* |
2 | * probe_roms - scan for Adapter ROMS | |
3 | * | |
4 | * (based on linux-2.6:arch/x86/kernel/probe_roms_32.c) | |
5 | * | |
6 | * Copyright (C) 2008 Intel Corporation | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms and conditions of the GNU General Public License, | |
10 | * version 2, as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along with | |
18 | * this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
20 | */ | |
21 | ||
22 | #include "probe_roms.h" | |
3c8bfb5d | 23 | #include "mdadm.h" |
39795f9c DW |
24 | #include <unistd.h> |
25 | #include <signal.h> | |
26 | #include <fcntl.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/stat.h> | |
29 | #include <sys/types.h> | |
30 | #include <asm/types.h> | |
31 | ||
32 | static void *rom_mem = MAP_FAILED; | |
33 | static int rom_fd = -1; | |
f21e18ca | 34 | static const int rom_len = 0xf0000 - 0xc0000; /* option-rom memory region */ |
39795f9c | 35 | static int _sigbus; |
969c2555 DW |
36 | static unsigned long rom_align; |
37 | ||
39795f9c DW |
38 | #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0])) |
39 | ||
40 | static void sigbus(int sig) | |
41 | { | |
42 | _sigbus = 1; | |
43 | } | |
44 | ||
45 | static int probe_address8(const __u8 *ptr, __u8 *val) | |
46 | { | |
47 | int rc = 0; | |
48 | ||
49 | *val = *ptr; | |
50 | if (_sigbus) | |
51 | rc = -1; | |
52 | _sigbus = 0; | |
53 | ||
54 | return rc; | |
55 | } | |
56 | ||
57 | static int probe_address16(const __u16 *ptr, __u16 *val) | |
58 | { | |
59 | int rc = 0; | |
60 | ||
61 | *val = *ptr; | |
62 | if (_sigbus) | |
63 | rc = -1; | |
64 | _sigbus = 0; | |
65 | ||
66 | return rc; | |
67 | } | |
68 | ||
69 | void probe_roms_exit(void) | |
70 | { | |
71 | signal(SIGBUS, SIG_DFL); | |
72 | if (rom_fd >= 0) { | |
73 | close(rom_fd); | |
74 | rom_fd = -1; | |
75 | } | |
76 | if (rom_mem != MAP_FAILED) { | |
77 | munmap(rom_mem, rom_len); | |
78 | rom_mem = MAP_FAILED; | |
79 | } | |
80 | } | |
81 | ||
969c2555 | 82 | int probe_roms_init(unsigned long align) |
39795f9c | 83 | { |
922f66a9 | 84 | int fd = -1; |
39795f9c DW |
85 | int rc = 0; |
86 | ||
969c2555 DW |
87 | /* valid values are 2048 and 512. 512 is for PCI-3.0 compliant |
88 | * systems, or systems that do not have dangerous/legacy ISA | |
89 | * devices. 2048 should always be safe | |
90 | */ | |
91 | if (align == 512 || align == 2048) | |
92 | rom_align = align; | |
93 | else | |
94 | return -1; | |
95 | ||
39795f9c DW |
96 | if (signal(SIGBUS, sigbus) == SIG_ERR) |
97 | rc = -1; | |
98 | if (rc == 0) { | |
99 | fd = open("/dev/mem", O_RDONLY); | |
100 | if (fd < 0) | |
101 | rc = -1; | |
102 | } | |
103 | if (rc == 0) { | |
104 | rom_mem = mmap(NULL, rom_len, PROT_READ, MAP_PRIVATE, fd, 0xc0000); | |
105 | if (rom_mem == MAP_FAILED) | |
106 | rc = -1; | |
107 | } | |
108 | ||
109 | if (rc == 0) | |
110 | rom_fd = fd; | |
922f66a9 AW |
111 | else { |
112 | if (fd >= 0) | |
113 | close(fd); | |
39795f9c | 114 | probe_roms_exit(); |
922f66a9 | 115 | } |
39795f9c DW |
116 | return rc; |
117 | } | |
118 | ||
119 | /** | |
120 | * isa_bus_to_virt - convert physical address to mmap'd region | |
121 | * @addr - address to convert | |
122 | * | |
123 | * Only valid between a successful call to probe_roms_init and the | |
124 | * corresponding probe_roms_exit | |
125 | */ | |
126 | static void *isa_bus_to_virt(unsigned long addr) | |
127 | { | |
128 | return rom_mem + (addr - 0xc0000); | |
129 | } | |
130 | ||
131 | struct resource { | |
132 | unsigned long start; | |
133 | unsigned long end; | |
3c8bfb5d | 134 | unsigned long data; |
39795f9c DW |
135 | const char *name; |
136 | }; | |
137 | ||
138 | static struct resource system_rom_resource = { | |
139 | .name = "System ROM", | |
140 | .start = 0xf0000, | |
3c8bfb5d | 141 | .data = 0, |
39795f9c DW |
142 | .end = 0xfffff, |
143 | }; | |
144 | ||
145 | static struct resource extension_rom_resource = { | |
146 | .name = "Extension ROM", | |
147 | .start = 0xe0000, | |
3c8bfb5d | 148 | .data = 0, |
39795f9c DW |
149 | .end = 0xeffff, |
150 | }; | |
151 | ||
152 | static struct resource adapter_rom_resources[] = { { | |
153 | .name = "Adapter ROM", | |
154 | .start = 0xc8000, | |
3c8bfb5d | 155 | .data = 0, |
39795f9c DW |
156 | .end = 0, |
157 | }, { | |
158 | .name = "Adapter ROM", | |
159 | .start = 0, | |
3c8bfb5d | 160 | .data = 0, |
39795f9c DW |
161 | .end = 0, |
162 | }, { | |
163 | .name = "Adapter ROM", | |
164 | .start = 0, | |
3c8bfb5d | 165 | .data = 0, |
39795f9c DW |
166 | .end = 0, |
167 | }, { | |
168 | .name = "Adapter ROM", | |
169 | .start = 0, | |
3c8bfb5d | 170 | .data = 0, |
39795f9c DW |
171 | .end = 0, |
172 | }, { | |
173 | .name = "Adapter ROM", | |
174 | .start = 0, | |
3c8bfb5d | 175 | .data = 0, |
39795f9c DW |
176 | .end = 0, |
177 | }, { | |
178 | .name = "Adapter ROM", | |
179 | .start = 0, | |
3c8bfb5d | 180 | .data = 0, |
39795f9c DW |
181 | .end = 0, |
182 | } }; | |
183 | ||
184 | static struct resource video_rom_resource = { | |
185 | .name = "Video ROM", | |
186 | .start = 0xc0000, | |
3c8bfb5d | 187 | .data = 0, |
39795f9c DW |
188 | .end = 0xc7fff, |
189 | }; | |
190 | ||
191 | #define ROMSIGNATURE 0xaa55 | |
192 | ||
193 | static int romsignature(const unsigned char *rom) | |
194 | { | |
195 | const unsigned short * const ptr = (const unsigned short *)rom; | |
196 | unsigned short sig = 0; | |
197 | ||
198 | return probe_address16(ptr, &sig) == 0 && sig == ROMSIGNATURE; | |
199 | } | |
200 | ||
201 | static int romchecksum(const unsigned char *rom, unsigned long length) | |
202 | { | |
203 | unsigned char sum, c; | |
204 | ||
205 | for (sum = 0; length && probe_address8(rom++, &c) == 0; length--) | |
206 | sum += c; | |
207 | return !length && !sum; | |
208 | } | |
209 | ||
210 | int scan_adapter_roms(scan_fn fn) | |
211 | { | |
212 | /* let scan_fn examing each of the adapter roms found by probe_roms */ | |
f21e18ca | 213 | unsigned int i; |
39795f9c DW |
214 | int found; |
215 | ||
216 | if (rom_fd < 0) | |
217 | return 0; | |
218 | ||
219 | found = 0; | |
220 | for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) { | |
221 | struct resource *res = &adapter_rom_resources[i]; | |
222 | ||
223 | if (res->start) { | |
224 | found = fn(isa_bus_to_virt(res->start), | |
3c8bfb5d LM |
225 | isa_bus_to_virt(res->end), |
226 | isa_bus_to_virt(res->data)); | |
39795f9c DW |
227 | if (found) |
228 | break; | |
229 | } else | |
230 | break; | |
231 | } | |
232 | ||
233 | return found; | |
234 | } | |
235 | ||
969c2555 DW |
236 | static unsigned long align(unsigned long addr, unsigned long alignment) |
237 | { | |
238 | return (addr + alignment - 1) & ~(alignment - 1); | |
239 | } | |
240 | ||
39795f9c DW |
241 | void probe_roms(void) |
242 | { | |
243 | const void *rom; | |
244 | unsigned long start, length, upper; | |
245 | unsigned char c; | |
f21e18ca | 246 | unsigned int i; |
3c8bfb5d | 247 | __u16 val=0; |
39795f9c DW |
248 | |
249 | if (rom_fd < 0) | |
250 | return; | |
251 | ||
252 | /* video rom */ | |
253 | upper = adapter_rom_resources[0].start; | |
969c2555 | 254 | for (start = video_rom_resource.start; start < upper; start += rom_align) { |
39795f9c DW |
255 | rom = isa_bus_to_virt(start); |
256 | if (!romsignature(rom)) | |
257 | continue; | |
258 | ||
259 | video_rom_resource.start = start; | |
260 | ||
261 | if (probe_address8(rom + 2, &c) != 0) | |
262 | continue; | |
263 | ||
264 | /* 0 < length <= 0x7f * 512, historically */ | |
265 | length = c * 512; | |
266 | ||
267 | /* if checksum okay, trust length byte */ | |
268 | if (length && romchecksum(rom, length)) | |
269 | video_rom_resource.end = start + length - 1; | |
270 | break; | |
271 | } | |
272 | ||
969c2555 | 273 | start = align(video_rom_resource.end + 1, rom_align); |
39795f9c DW |
274 | if (start < upper) |
275 | start = upper; | |
276 | ||
277 | /* system rom */ | |
278 | upper = system_rom_resource.start; | |
279 | ||
280 | /* check for extension rom (ignore length byte!) */ | |
281 | rom = isa_bus_to_virt(extension_rom_resource.start); | |
282 | if (romsignature(rom)) { | |
283 | length = extension_rom_resource.end - extension_rom_resource.start + 1; | |
284 | if (romchecksum(rom, length)) | |
285 | upper = extension_rom_resource.start; | |
286 | } | |
287 | ||
288 | /* check for adapter roms on 2k boundaries */ | |
969c2555 | 289 | for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += rom_align) { |
39795f9c DW |
290 | rom = isa_bus_to_virt(start); |
291 | if (!romsignature(rom)) | |
292 | continue; | |
293 | ||
294 | if (probe_address8(rom + 2, &c) != 0) | |
295 | continue; | |
296 | ||
297 | /* 0 < length <= 0x7f * 512, historically */ | |
298 | length = c * 512; | |
299 | ||
3c8bfb5d LM |
300 | /* Retrieve 16-bit pointer to PCI Data Structure (offset 18h-19h) |
301 | * The data can be within 64KB forward of the first location | |
302 | * of this code image. The pointer is in little-endian order | |
303 | */ | |
304 | ||
305 | if (probe_address16(rom + 0x18, &val) != 0) | |
306 | continue; | |
307 | val = __le16_to_cpu(val); | |
308 | ||
39795f9c DW |
309 | /* but accept any length that fits if checksum okay */ |
310 | if (!length || start + length > upper || !romchecksum(rom, length)) | |
311 | continue; | |
312 | ||
313 | adapter_rom_resources[i].start = start; | |
3c8bfb5d | 314 | adapter_rom_resources[i].data = start + (unsigned long) val; |
39795f9c DW |
315 | adapter_rom_resources[i].end = start + length - 1; |
316 | ||
969c2555 | 317 | start = adapter_rom_resources[i++].end & ~(rom_align - 1); |
39795f9c DW |
318 | } |
319 | } |