Include missing linux/slab.h inclusions
[linux-3.10.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 <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
24 static 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
31 static 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
38 static 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
70 static 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 /* does this oprom support the given pci device, or any of the devices
78  * that the driver supports?
79  */
80 static 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
95 static 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
113 static 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
153 void __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 }
162 EXPORT_SYMBOL(pci_map_biosrom);
163
164 void pci_unmap_biosrom(void __iomem *image)
165 {
166         iounmap(image);
167 }
168 EXPORT_SYMBOL(pci_unmap_biosrom);
169
170 size_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 }
176 EXPORT_SYMBOL(pci_biosrom_size);
177
178 #define ROMSIGNATURE 0xaa55
179
180 static 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
188 static 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
197 void __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         /* video rom */
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                 /* 0 < length <= 0x7f * 512, historically */
217                 length = c * 512;
218
219                 /* if checksum okay, trust length byte */
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         /* system rom */
232         request_resource(&iomem_resource, &system_rom_resource);
233         upper = system_rom_resource.start;
234
235         /* check for extension rom (ignore length byte!) */
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         /* check for adapter roms on 2k boundaries */
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                 /* 0 < length <= 0x7f * 512, historically */
255                 length = c * 512;
256
257                 /* but accept any length that fits if checksum okay */
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