Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[linux-2.6.git] / arch / x86 / kernel / probe_roms.c
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 <asm/pci-direct.h>
14
15
16 #include <asm/e820.h>
17 #include <asm/mmzone.h>
18 #include <asm/setup.h>
19 #include <asm/sections.h>
20 #include <asm/io.h>
21 #include <asm/setup_arch.h>
22
23 static struct resource system_rom_resource = {
24         .name   = "System ROM",
25         .start  = 0xf0000,
26         .end    = 0xfffff,
27         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
28 };
29
30 static struct resource extension_rom_resource = {
31         .name   = "Extension ROM",
32         .start  = 0xe0000,
33         .end    = 0xeffff,
34         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
35 };
36
37 static struct resource adapter_rom_resources[] = { {
38         .name   = "Adapter ROM",
39         .start  = 0xc8000,
40         .end    = 0,
41         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
42 }, {
43         .name   = "Adapter ROM",
44         .start  = 0,
45         .end    = 0,
46         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
47 }, {
48         .name   = "Adapter ROM",
49         .start  = 0,
50         .end    = 0,
51         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
52 }, {
53         .name   = "Adapter ROM",
54         .start  = 0,
55         .end    = 0,
56         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
57 }, {
58         .name   = "Adapter ROM",
59         .start  = 0,
60         .end    = 0,
61         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
62 }, {
63         .name   = "Adapter ROM",
64         .start  = 0,
65         .end    = 0,
66         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
67 } };
68
69 static struct resource video_rom_resource = {
70         .name   = "Video ROM",
71         .start  = 0xc0000,
72         .end    = 0xc7fff,
73         .flags  = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
74 };
75
76 /* does this oprom support the given pci device, or any of the devices
77  * that the driver supports?
78  */
79 static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short device)
80 {
81         struct pci_driver *drv = pdev->driver;
82         const struct pci_device_id *id;
83
84         if (pdev->vendor == vendor && pdev->device == device)
85                 return true;
86
87         for (id = drv ? drv->id_table : NULL; id && id->vendor; id++)
88                 if (id->vendor == vendor && id->device == device)
89                         break;
90
91         return id && id->vendor;
92 }
93
94 static bool probe_list(struct pci_dev *pdev, unsigned short vendor,
95                        const unsigned char *rom_list)
96 {
97         unsigned short device;
98
99         do {
100                 if (probe_kernel_address(rom_list, device) != 0)
101                         device = 0;
102
103                 if (device && match_id(pdev, vendor, device))
104                         break;
105
106                 rom_list += 2;
107         } while (device);
108
109         return !!device;
110 }
111
112 static struct resource *find_oprom(struct pci_dev *pdev)
113 {
114         struct resource *oprom = NULL;
115         int i;
116
117         for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) {
118                 struct resource *res = &adapter_rom_resources[i];
119                 unsigned short offset, vendor, device, list, rev;
120                 const unsigned char *rom;
121
122                 if (res->end == 0)
123                         break;
124
125                 rom = isa_bus_to_virt(res->start);
126                 if (probe_kernel_address(rom + 0x18, offset) != 0)
127                         continue;
128
129                 if (probe_kernel_address(rom + offset + 0x4, vendor) != 0)
130                         continue;
131
132                 if (probe_kernel_address(rom + offset + 0x6, device) != 0)
133                         continue;
134
135                 if (match_id(pdev, vendor, device)) {
136                         oprom = res;
137                         break;
138                 }
139
140                 if (probe_kernel_address(rom + offset + 0x8, list) == 0 &&
141                     probe_kernel_address(rom + offset + 0xc, rev) == 0 &&
142                     rev >= 3 && list &&
143                     probe_list(pdev, vendor, rom + offset + list)) {
144                         oprom = res;
145                         break;
146                 }
147         }
148
149         return oprom;
150 }
151
152 void *pci_map_biosrom(struct pci_dev *pdev)
153 {
154         struct resource *oprom = find_oprom(pdev);
155
156         if (!oprom)
157                 return NULL;
158
159         return ioremap(oprom->start, resource_size(oprom));
160 }
161 EXPORT_SYMBOL(pci_map_biosrom);
162
163 void pci_unmap_biosrom(void __iomem *image)
164 {
165         iounmap(image);
166 }
167 EXPORT_SYMBOL(pci_unmap_biosrom);
168
169 size_t pci_biosrom_size(struct pci_dev *pdev)
170 {
171         struct resource *oprom = find_oprom(pdev);
172
173         return oprom ? resource_size(oprom) : 0;
174 }
175 EXPORT_SYMBOL(pci_biosrom_size);
176
177 #define ROMSIGNATURE 0xaa55
178
179 static int __init romsignature(const unsigned char *rom)
180 {
181         const unsigned short * const ptr = (const unsigned short *)rom;
182         unsigned short sig;
183
184         return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE;
185 }
186
187 static int __init romchecksum(const unsigned char *rom, unsigned long length)
188 {
189         unsigned char sum, c;
190
191         for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--)
192                 sum += c;
193         return !length && !sum;
194 }
195
196 void __init probe_roms(void)
197 {
198         const unsigned char *rom;
199         unsigned long start, length, upper;
200         unsigned char c;
201         int i;
202
203         /* video rom */
204         upper = adapter_rom_resources[0].start;
205         for (start = video_rom_resource.start; start < upper; start += 2048) {
206                 rom = isa_bus_to_virt(start);
207                 if (!romsignature(rom))
208                         continue;
209
210                 video_rom_resource.start = start;
211
212                 if (probe_kernel_address(rom + 2, c) != 0)
213                         continue;
214
215                 /* 0 < length <= 0x7f * 512, historically */
216                 length = c * 512;
217
218                 /* if checksum okay, trust length byte */
219                 if (length && romchecksum(rom, length))
220                         video_rom_resource.end = start + length - 1;
221
222                 request_resource(&iomem_resource, &video_rom_resource);
223                 break;
224         }
225
226         start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
227         if (start < upper)
228                 start = upper;
229
230         /* system rom */
231         request_resource(&iomem_resource, &system_rom_resource);
232         upper = system_rom_resource.start;
233
234         /* check for extension rom (ignore length byte!) */
235         rom = isa_bus_to_virt(extension_rom_resource.start);
236         if (romsignature(rom)) {
237                 length = resource_size(&extension_rom_resource);
238                 if (romchecksum(rom, length)) {
239                         request_resource(&iomem_resource, &extension_rom_resource);
240                         upper = extension_rom_resource.start;
241                 }
242         }
243
244         /* check for adapter roms on 2k boundaries */
245         for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) {
246                 rom = isa_bus_to_virt(start);
247                 if (!romsignature(rom))
248                         continue;
249
250                 if (probe_kernel_address(rom + 2, c) != 0)
251                         continue;
252
253                 /* 0 < length <= 0x7f * 512, historically */
254                 length = c * 512;
255
256                 /* but accept any length that fits if checksum okay */
257                 if (!length || start + length > upper || !romchecksum(rom, length))
258                         continue;
259
260                 adapter_rom_resources[i].start = start;
261                 adapter_rom_resources[i].end = start + length - 1;
262                 request_resource(&iomem_resource, &adapter_rom_resources[i]);
263
264                 start = adapter_rom_resources[i++].end & ~2047UL;
265         }
266 }
267