#include <linux/sched.h> #include <linux/mm.h> #include <linux/uaccess.h> #include <linux/mmzone.h> #include <linux/ioport.h> #include <linux/seq_file.h> #include <linux/console.h> #include <linux/init.h> #include <linux/edd.h> #include <linux/dmi.h> #include <linux/pfn.h> #include <linux/pci.h> #include <asm/pci-direct.h> #include <asm/e820.h> #include <asm/mmzone.h> #include <asm/setup.h> #include <asm/sections.h> #include <asm/io.h> #include <setup_arch.h> static struct resource system_rom_resource = { .name = "System ROM", .start = 0xf0000, .end = 0xfffff, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM }; static struct resource extension_rom_resource = { .name = "Extension ROM", .start = 0xe0000, .end = 0xeffff, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM }; static struct resource adapter_rom_resources[] = { { .name = "Adapter ROM", .start = 0xc8000, .end = 0, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM }, { .name = "Adapter ROM", .start = 0, .end = 0, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM }, { .name = "Adapter ROM", .start = 0, .end = 0, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM }, { .name = "Adapter ROM", .start = 0, .end = 0, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM }, { .name = "Adapter ROM", .start = 0, .end = 0, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM }, { .name = "Adapter ROM", .start = 0, .end = 0, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM } }; static struct resource video_rom_resource = { .name = "Video ROM", .start = 0xc0000, .end = 0xc7fff, .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM }; #define ROMSIGNATURE 0xaa55 static int __init romsignature(const unsigned char *rom) { const unsigned short * const ptr = (const unsigned short *)rom; unsigned short sig; return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE; } static int __init romchecksum(const unsigned char *rom, unsigned long length) { unsigned char sum, c; for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--) sum += c; return !length && !sum; } void __init probe_roms(void) { const unsigned char *rom; unsigned long start, length, upper; unsigned char c; int i; /* video rom */ upper = adapter_rom_resources[0].start; for (start = video_rom_resource.start; start < upper; start += 2048) { rom = isa_bus_to_virt(start); if (!romsignature(rom)) continue; video_rom_resource.start = start; if (probe_kernel_address(rom + 2, c) != 0) continue; /* 0 < length <= 0x7f * 512, historically */ length = c * 512; /* if checksum okay, trust length byte */ if (length && romchecksum(rom, length)) video_rom_resource.end = start + length - 1; request_resource(&iomem_resource, &video_rom_resource); break; } start = (video_rom_resource.end + 1 + 2047) & ~2047UL; if (start < upper) start = upper; /* system rom */ request_resource(&iomem_resource, &system_rom_resource); upper = system_rom_resource.start; /* check for extension rom (ignore length byte!) */ rom = isa_bus_to_virt(extension_rom_resource.start); if (romsignature(rom)) { length = extension_rom_resource.end - extension_rom_resource.start + 1; if (romchecksum(rom, length)) { request_resource(&iomem_resource, &extension_rom_resource); upper = extension_rom_resource.start; } } /* check for adapter roms on 2k boundaries */ for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) { rom = isa_bus_to_virt(start); if (!romsignature(rom)) continue; if (probe_kernel_address(rom + 2, c) != 0) continue; /* 0 < length <= 0x7f * 512, historically */ length = c * 512; /* but accept any length that fits if checksum okay */ if (!length || start + length > upper || !romchecksum(rom, length)) continue; adapter_rom_resources[i].start = start; adapter_rom_resources[i].end = start + length - 1; request_resource(&iomem_resource, &adapter_rom_resources[i]); start = adapter_rom_resources[i++].end & ~2047UL; } }