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7b2a0a6c48
this way 32-bit is more similar to 64-bit, and smarter e820 and numa. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
342 lines
8.6 KiB
C
342 lines
8.6 KiB
C
#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/ioport.h>
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#include <linux/string.h>
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#include <linux/kexec.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/pfn.h>
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#include <linux/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/e820.h>
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#include <asm/setup.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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static 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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/*
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* Request address space for all standard RAM and ROM resources
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* and also for regions reported as reserved by the e820.
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*/
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void __init init_iomem_resources(struct resource *code_resource,
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struct resource *data_resource,
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struct resource *bss_resource)
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{
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int i;
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probe_roms();
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for (i = 0; i < e820.nr_map; i++) {
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struct resource *res;
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#ifndef CONFIG_RESOURCES_64BIT
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if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
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continue;
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#endif
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res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
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switch (e820.map[i].type) {
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case E820_RAM: res->name = "System RAM"; break;
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case E820_ACPI: res->name = "ACPI Tables"; break;
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case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
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default: res->name = "reserved";
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}
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res->start = e820.map[i].addr;
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res->end = res->start + e820.map[i].size - 1;
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res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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if (request_resource(&iomem_resource, res)) {
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kfree(res);
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continue;
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}
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if (e820.map[i].type == E820_RAM) {
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/*
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* We don't know which RAM region contains kernel data,
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* so we try it repeatedly and let the resource manager
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* test it.
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*/
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request_resource(res, code_resource);
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request_resource(res, data_resource);
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request_resource(res, bss_resource);
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#ifdef CONFIG_KEXEC
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if (crashk_res.start != crashk_res.end)
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request_resource(res, &crashk_res);
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#endif
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}
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}
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}
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void __init limit_regions(unsigned long long size)
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{
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unsigned long long current_addr;
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int i;
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e820_print_map("limit_regions start");
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for (i = 0; i < e820.nr_map; i++) {
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current_addr = e820.map[i].addr + e820.map[i].size;
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if (current_addr < size)
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continue;
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if (e820.map[i].type != E820_RAM)
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continue;
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if (e820.map[i].addr >= size) {
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/*
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* This region starts past the end of the
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* requested size, skip it completely.
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*/
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e820.nr_map = i;
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} else {
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e820.nr_map = i + 1;
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e820.map[i].size -= current_addr - size;
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}
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e820_print_map("limit_regions endfor");
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return;
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}
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e820_print_map("limit_regions endfunc");
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}
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/* Overridden in paravirt.c if CONFIG_PARAVIRT */
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char * __init __attribute__((weak)) memory_setup(void)
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{
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return machine_specific_memory_setup();
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}
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void __init setup_memory_map(void)
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{
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printk(KERN_INFO "BIOS-provided physical RAM map:\n");
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e820_print_map(memory_setup());
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}
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static int __initdata user_defined_memmap;
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/*
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* "mem=nopentium" disables the 4MB page tables.
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* "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
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* to <mem>, overriding the bios size.
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* "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
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* <start> to <start>+<mem>, overriding the bios size.
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*
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* HPA tells me bootloaders need to parse mem=, so no new
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* option should be mem= [also see Documentation/i386/boot.txt]
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*/
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static int __init parse_mem(char *arg)
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{
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if (!arg)
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return -EINVAL;
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if (strcmp(arg, "nopentium") == 0) {
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setup_clear_cpu_cap(X86_FEATURE_PSE);
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} else {
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/* If the user specifies memory size, we
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* limit the BIOS-provided memory map to
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* that size. exactmap can be used to specify
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* the exact map. mem=number can be used to
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* trim the existing memory map.
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*/
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unsigned long long mem_size;
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mem_size = memparse(arg, &arg);
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limit_regions(mem_size);
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user_defined_memmap = 1;
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}
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return 0;
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}
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early_param("mem", parse_mem);
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static int __init parse_memmap(char *arg)
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{
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if (!arg)
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return -EINVAL;
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if (strcmp(arg, "exactmap") == 0) {
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#ifdef CONFIG_CRASH_DUMP
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/* If we are doing a crash dump, we
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* still need to know the real mem
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* size before original memory map is
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* reset.
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*/
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e820_register_active_regions(0, 0, -1UL);
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saved_max_pfn = e820_end_of_ram();
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remove_all_active_ranges();
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#endif
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e820.nr_map = 0;
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user_defined_memmap = 1;
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} else {
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/* If the user specifies memory size, we
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* limit the BIOS-provided memory map to
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* that size. exactmap can be used to specify
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* the exact map. mem=number can be used to
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* trim the existing memory map.
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*/
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unsigned long long start_at, mem_size;
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mem_size = memparse(arg, &arg);
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if (*arg == '@') {
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start_at = memparse(arg+1, &arg);
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add_memory_region(start_at, mem_size, E820_RAM);
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} else if (*arg == '#') {
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start_at = memparse(arg+1, &arg);
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add_memory_region(start_at, mem_size, E820_ACPI);
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} else if (*arg == '$') {
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start_at = memparse(arg+1, &arg);
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add_memory_region(start_at, mem_size, E820_RESERVED);
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} else {
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limit_regions(mem_size);
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user_defined_memmap = 1;
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}
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}
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return 0;
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}
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early_param("memmap", parse_memmap);
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void __init finish_e820_parsing(void)
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{
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if (user_defined_memmap) {
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printk(KERN_INFO "user-defined physical RAM map:\n");
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e820_print_map("user");
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}
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}
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