| 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 | |