This source file includes following definitions.
- match_id
- probe_list
- find_oprom
- pci_map_biosrom
- pci_unmap_biosrom
- pci_biosrom_size
- romsignature
- romchecksum
- probe_roms
1
2 #include <linux/sched.h>
3 #include <linux/mm.h>
4 #include <linux/uaccess.h>
5 #include <linux/mmzone.h>
6 #include <linux/ioport.h>
7 #include <linux/seq_file.h>
8 #include <linux/console.h>
9 #include <linux/init.h>
10 #include <linux/edd.h>
11 #include <linux/dmi.h>
12 #include <linux/pfn.h>
13 #include <linux/pci.h>
14 #include <linux/export.h>
15
16 #include <asm/probe_roms.h>
17 #include <asm/pci-direct.h>
18 #include <asm/e820/api.h>
19 #include <asm/mmzone.h>
20 #include <asm/setup.h>
21 #include <asm/sections.h>
22 #include <asm/io.h>
23 #include <asm/setup_arch.h>
24
25 static struct resource system_rom_resource = {
26 .name = "System ROM",
27 .start = 0xf0000,
28 .end = 0xfffff,
29 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
30 };
31
32 static struct resource extension_rom_resource = {
33 .name = "Extension ROM",
34 .start = 0xe0000,
35 .end = 0xeffff,
36 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
37 };
38
39 static struct resource adapter_rom_resources[] = { {
40 .name = "Adapter ROM",
41 .start = 0xc8000,
42 .end = 0,
43 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
44 }, {
45 .name = "Adapter ROM",
46 .start = 0,
47 .end = 0,
48 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
49 }, {
50 .name = "Adapter ROM",
51 .start = 0,
52 .end = 0,
53 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
54 }, {
55 .name = "Adapter ROM",
56 .start = 0,
57 .end = 0,
58 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
59 }, {
60 .name = "Adapter ROM",
61 .start = 0,
62 .end = 0,
63 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
64 }, {
65 .name = "Adapter ROM",
66 .start = 0,
67 .end = 0,
68 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
69 } };
70
71 static struct resource video_rom_resource = {
72 .name = "Video ROM",
73 .start = 0xc0000,
74 .end = 0xc7fff,
75 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
76 };
77
78
79
80
81 static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short device)
82 {
83 struct pci_driver *drv = pdev->driver;
84 const struct pci_device_id *id;
85
86 if (pdev->vendor == vendor && pdev->device == device)
87 return true;
88
89 for (id = drv ? drv->id_table : NULL; id && id->vendor; id++)
90 if (id->vendor == vendor && id->device == device)
91 break;
92
93 return id && id->vendor;
94 }
95
96 static bool probe_list(struct pci_dev *pdev, unsigned short vendor,
97 const unsigned char *rom_list)
98 {
99 unsigned short device;
100
101 do {
102 if (probe_kernel_address(rom_list, device) != 0)
103 device = 0;
104
105 if (device && match_id(pdev, vendor, device))
106 break;
107
108 rom_list += 2;
109 } while (device);
110
111 return !!device;
112 }
113
114 static struct resource *find_oprom(struct pci_dev *pdev)
115 {
116 struct resource *oprom = NULL;
117 int i;
118
119 for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) {
120 struct resource *res = &adapter_rom_resources[i];
121 unsigned short offset, vendor, device, list, rev;
122 const unsigned char *rom;
123
124 if (res->end == 0)
125 break;
126
127 rom = isa_bus_to_virt(res->start);
128 if (probe_kernel_address(rom + 0x18, offset) != 0)
129 continue;
130
131 if (probe_kernel_address(rom + offset + 0x4, vendor) != 0)
132 continue;
133
134 if (probe_kernel_address(rom + offset + 0x6, device) != 0)
135 continue;
136
137 if (match_id(pdev, vendor, device)) {
138 oprom = res;
139 break;
140 }
141
142 if (probe_kernel_address(rom + offset + 0x8, list) == 0 &&
143 probe_kernel_address(rom + offset + 0xc, rev) == 0 &&
144 rev >= 3 && list &&
145 probe_list(pdev, vendor, rom + offset + list)) {
146 oprom = res;
147 break;
148 }
149 }
150
151 return oprom;
152 }
153
154 void __iomem *pci_map_biosrom(struct pci_dev *pdev)
155 {
156 struct resource *oprom = find_oprom(pdev);
157
158 if (!oprom)
159 return NULL;
160
161 return ioremap(oprom->start, resource_size(oprom));
162 }
163 EXPORT_SYMBOL(pci_map_biosrom);
164
165 void pci_unmap_biosrom(void __iomem *image)
166 {
167 iounmap(image);
168 }
169 EXPORT_SYMBOL(pci_unmap_biosrom);
170
171 size_t pci_biosrom_size(struct pci_dev *pdev)
172 {
173 struct resource *oprom = find_oprom(pdev);
174
175 return oprom ? resource_size(oprom) : 0;
176 }
177 EXPORT_SYMBOL(pci_biosrom_size);
178
179 #define ROMSIGNATURE 0xaa55
180
181 static int __init romsignature(const unsigned char *rom)
182 {
183 const unsigned short * const ptr = (const unsigned short *)rom;
184 unsigned short sig;
185
186 return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE;
187 }
188
189 static int __init romchecksum(const unsigned char *rom, unsigned long length)
190 {
191 unsigned char sum, c;
192
193 for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--)
194 sum += c;
195 return !length && !sum;
196 }
197
198 void __init probe_roms(void)
199 {
200 const unsigned char *rom;
201 unsigned long start, length, upper;
202 unsigned char c;
203 int i;
204
205
206 upper = adapter_rom_resources[0].start;
207 for (start = video_rom_resource.start; start < upper; start += 2048) {
208 rom = isa_bus_to_virt(start);
209 if (!romsignature(rom))
210 continue;
211
212 video_rom_resource.start = start;
213
214 if (probe_kernel_address(rom + 2, c) != 0)
215 continue;
216
217
218 length = c * 512;
219
220
221 if (length && romchecksum(rom, length))
222 video_rom_resource.end = start + length - 1;
223
224 request_resource(&iomem_resource, &video_rom_resource);
225 break;
226 }
227
228 start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
229 if (start < upper)
230 start = upper;
231
232
233 request_resource(&iomem_resource, &system_rom_resource);
234 upper = system_rom_resource.start;
235
236
237 rom = isa_bus_to_virt(extension_rom_resource.start);
238 if (romsignature(rom)) {
239 length = resource_size(&extension_rom_resource);
240 if (romchecksum(rom, length)) {
241 request_resource(&iomem_resource, &extension_rom_resource);
242 upper = extension_rom_resource.start;
243 }
244 }
245
246
247 for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) {
248 rom = isa_bus_to_virt(start);
249 if (!romsignature(rom))
250 continue;
251
252 if (probe_kernel_address(rom + 2, c) != 0)
253 continue;
254
255
256 length = c * 512;
257
258
259 if (!length || start + length > upper || !romchecksum(rom, length))
260 continue;
261
262 adapter_rom_resources[i].start = start;
263 adapter_rom_resources[i].end = start + length - 1;
264 request_resource(&iomem_resource, &adapter_rom_resources[i]);
265
266 start = adapter_rom_resources[i++].end & ~2047UL;
267 }
268 }
269