projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a9c1182f YL |
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 <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 | #define ROMSIGNATURE 0xaa55 | |
| 77 | ||
| 78 | static int __init romsignature(const unsigned char *rom) | |
| 79 | { | |
| 80 | const unsigned short * const ptr = (const unsigned short *)rom; | |
| 81 | unsigned short sig; | |
| 82 | ||
| 83 | return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE; | |
| 84 | } | |
| 85 | ||
| 86 | static int __init romchecksum(const unsigned char *rom, unsigned long length) | |
| 87 | { | |
| 88 | unsigned char sum, c; | |
| 89 | ||
| 90 | for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--) | |
| 91 | sum += c; | |
| 92 | return !length && !sum; | |
| 93 | } | |
| 94 | ||
| 95 | void __init probe_roms(void) | |
| 96 | { | |
| 97 | const unsigned char *rom; | |
| 98 | unsigned long start, length, upper; | |
| 99 | unsigned char c; | |
| 100 | int i; | |
| 101 | ||
| 102 | /* video rom */ | |
| 103 | upper = adapter_rom_resources[0].start; | |
| 104 | for (start = video_rom_resource.start; start < upper; start += 2048) { | |
| 105 | rom = isa_bus_to_virt(start); | |
| 106 | if (!romsignature(rom)) | |
| 107 | continue; | |
| 108 | ||
| 109 | video_rom_resource.start = start; | |
| 110 | ||
| 111 | if (probe_kernel_address(rom + 2, c) != 0) | |
| 112 | continue; | |
| 113 | ||
| 114 | /* 0 < length <= 0x7f * 512, historically */ | |
| 115 | length = c * 512; | |
| 116 | ||
| 117 | /* if checksum okay, trust length byte */ | |
| 118 | if (length && romchecksum(rom, length)) | |
| 119 | video_rom_resource.end = start + length - 1; | |
| 120 | ||
| 121 | request_resource(&iomem_resource, &video_rom_resource); | |
| 122 | break; | |
| 123 | } | |
| 124 | ||
| 125 | start = (video_rom_resource.end + 1 + 2047) & ~2047UL; | |
| 126 | if (start < upper) | |
| 127 | start = upper; | |
| 128 | ||
| 129 | /* system rom */ | |
| 130 | request_resource(&iomem_resource, &system_rom_resource); | |
| 131 | upper = system_rom_resource.start; | |
| 132 | ||
| 133 | /* check for extension rom (ignore length byte!) */ | |
| 134 | rom = isa_bus_to_virt(extension_rom_resource.start); | |
| 135 | if (romsignature(rom)) { | |
| 136 | length = extension_rom_resource.end - extension_rom_resource.start + 1; | |
| 137 | if (romchecksum(rom, length)) { | |
| 138 | request_resource(&iomem_resource, &extension_rom_resource); | |
| 139 | upper = extension_rom_resource.start; | |
| 140 | } | |
| 141 | } | |
| 142 | ||
| 143 | /* check for adapter roms on 2k boundaries */ | |
| 144 | for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) { | |
| 145 | rom = isa_bus_to_virt(start); | |
| 146 | if (!romsignature(rom)) | |
| 147 | continue; | |
| 148 | ||
| 149 | if (probe_kernel_address(rom + 2, c) != 0) | |
| 150 | continue; | |
| 151 | ||
| 152 | /* 0 < length <= 0x7f * 512, historically */ | |
| 153 | length = c * 512; | |
| 154 | ||
| 155 | /* but accept any length that fits if checksum okay */ | |
| 156 | if (!length || start + length > upper || !romchecksum(rom, length)) | |
| 157 | continue; | |
| 158 | ||
| 159 | adapter_rom_resources[i].start = start; | |
| 160 | adapter_rom_resources[i].end = start + length - 1; | |
| 161 | request_resource(&iomem_resource, &adapter_rom_resources[i]); | |
| 162 | ||
| 163 | start = adapter_rom_resources[i++].end & ~2047UL; | |
| 164 | } | |
| 165 | } | |
| 166 |