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