Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Yinghai Lu | a9c1182 | 2008-06-21 15:39:41 -0700 | [diff] [blame] | 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> |
Paul Gortmaker | 69c60c8 | 2011-05-26 12:22:53 -0400 | [diff] [blame] | 14 | #include <linux/export.h> |
| 15 | |
Jan Beulich | a240ada | 2012-03-08 09:24:57 +0000 | [diff] [blame] | 16 | #include <asm/probe_roms.h> |
Yinghai Lu | a9c1182 | 2008-06-21 15:39:41 -0700 | [diff] [blame] | 17 | #include <asm/pci-direct.h> |
Ingo Molnar | 66441bd | 2017-01-27 10:27:10 +0100 | [diff] [blame] | 18 | #include <asm/e820/api.h> |
Yinghai Lu | a9c1182 | 2008-06-21 15:39:41 -0700 | [diff] [blame] | 19 | #include <asm/mmzone.h> |
| 20 | #include <asm/setup.h> |
| 21 | #include <asm/sections.h> |
| 22 | #include <asm/io.h> |
Ingo Molnar | 1164dd0 | 2009-01-28 19:34:09 +0100 | [diff] [blame] | 23 | #include <asm/setup_arch.h> |
Yinghai Lu | a9c1182 | 2008-06-21 15:39:41 -0700 | [diff] [blame] | 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 | |
Dan Williams | 5d94e81 | 2011-03-08 10:36:19 -0800 | [diff] [blame] | 78 | /* does this oprom support the given pci device, or any of the devices |
| 79 | * that the driver supports? |
| 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 | |
Mathias Krause | 04d695a | 2012-09-02 23:31:43 +0200 | [diff] [blame] | 154 | void __iomem *pci_map_biosrom(struct pci_dev *pdev) |
Dan Williams | 5d94e81 | 2011-03-08 10:36:19 -0800 | [diff] [blame] | 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 | |
Yinghai Lu | a9c1182 | 2008-06-21 15:39:41 -0700 | [diff] [blame] | 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 | /* video rom */ |
| 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 | /* 0 < length <= 0x7f * 512, historically */ |
| 218 | length = c * 512; |
| 219 | |
| 220 | /* if checksum okay, trust length byte */ |
| 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 | /* system rom */ |
| 233 | request_resource(&iomem_resource, &system_rom_resource); |
| 234 | upper = system_rom_resource.start; |
| 235 | |
| 236 | /* check for extension rom (ignore length byte!) */ |
| 237 | rom = isa_bus_to_virt(extension_rom_resource.start); |
| 238 | if (romsignature(rom)) { |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 239 | length = resource_size(&extension_rom_resource); |
Yinghai Lu | a9c1182 | 2008-06-21 15:39:41 -0700 | [diff] [blame] | 240 | if (romchecksum(rom, length)) { |
| 241 | request_resource(&iomem_resource, &extension_rom_resource); |
| 242 | upper = extension_rom_resource.start; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | /* check for adapter roms on 2k boundaries */ |
| 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 | /* 0 < length <= 0x7f * 512, historically */ |
| 256 | length = c * 512; |
| 257 | |
| 258 | /* but accept any length that fits if checksum okay */ |
| 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 | |