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