789 строки
20 KiB
C
789 строки
20 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 <linux/suspend.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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struct e820map e820;
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struct change_member {
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struct e820entry *pbios; /* pointer to original bios entry */
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unsigned long long addr; /* address for this change point */
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};
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static struct change_member change_point_list[2*E820MAX] __initdata;
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static struct change_member *change_point[2*E820MAX] __initdata;
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static struct e820entry *overlap_list[E820MAX] __initdata;
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static struct e820entry new_bios[E820MAX] __initdata;
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/* For PCI or other memory-mapped resources */
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unsigned long pci_mem_start = 0x10000000;
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#ifdef CONFIG_PCI
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EXPORT_SYMBOL(pci_mem_start);
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#endif
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extern int user_defined_memmap;
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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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#if defined(CONFIG_PM) && defined(CONFIG_HIBERNATION)
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/**
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* e820_mark_nosave_regions - Find the ranges of physical addresses that do not
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* correspond to e820 RAM areas and mark the corresponding pages as nosave for
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* hibernation.
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*
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* This function requires the e820 map to be sorted and without any
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* overlapping entries and assumes the first e820 area to be RAM.
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*/
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void __init e820_mark_nosave_regions(void)
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{
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int i;
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unsigned long pfn;
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pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
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for (i = 1; i < e820.nr_map; i++) {
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struct e820entry *ei = &e820.map[i];
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if (pfn < PFN_UP(ei->addr))
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register_nosave_region(pfn, PFN_UP(ei->addr));
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pfn = PFN_DOWN(ei->addr + ei->size);
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if (ei->type != E820_RAM)
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register_nosave_region(PFN_UP(ei->addr), pfn);
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if (pfn >= max_low_pfn)
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break;
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}
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}
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#endif
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void __init add_memory_region(unsigned long long start,
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unsigned long long size, int type)
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{
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int x;
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x = e820.nr_map;
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if (x == E820MAX) {
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printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
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return;
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}
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e820.map[x].addr = start;
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e820.map[x].size = size;
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e820.map[x].type = type;
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e820.nr_map++;
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} /* add_memory_region */
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/*
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* Sanitize the BIOS e820 map.
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*
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* Some e820 responses include overlapping entries. The following
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* replaces the original e820 map with a new one, removing overlaps.
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*
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*/
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int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map)
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{
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struct change_member *change_tmp;
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unsigned long current_type, last_type;
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unsigned long long last_addr;
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int chgidx, still_changing;
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int overlap_entries;
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int new_bios_entry;
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int old_nr, new_nr, chg_nr;
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int i;
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/*
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Visually we're performing the following (1,2,3,4 = memory types)...
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Sample memory map (w/overlaps):
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____22__________________
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______________________4_
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____1111________________
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_44_____________________
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11111111________________
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____________________33__
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___________44___________
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__________33333_________
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______________22________
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___________________2222_
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_________111111111______
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_____________________11_
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_________________4______
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Sanitized equivalent (no overlap):
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1_______________________
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_44_____________________
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___1____________________
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____22__________________
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______11________________
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_________1______________
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__________3_____________
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___________44___________
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_____________33_________
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_______________2________
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________________1_______
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_________________4______
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___________________2____
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____________________33__
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______________________4_
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*/
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/* if there's only one memory region, don't bother */
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if (*pnr_map < 2) {
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return -1;
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}
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old_nr = *pnr_map;
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/* bail out if we find any unreasonable addresses in bios map */
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for (i=0; i<old_nr; i++)
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if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr) {
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return -1;
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}
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/* create pointers for initial change-point information (for sorting) */
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for (i=0; i < 2*old_nr; i++)
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change_point[i] = &change_point_list[i];
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/* record all known change-points (starting and ending addresses),
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omitting those that are for empty memory regions */
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chgidx = 0;
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for (i=0; i < old_nr; i++) {
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if (biosmap[i].size != 0) {
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change_point[chgidx]->addr = biosmap[i].addr;
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change_point[chgidx++]->pbios = &biosmap[i];
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change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size;
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change_point[chgidx++]->pbios = &biosmap[i];
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}
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}
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chg_nr = chgidx; /* true number of change-points */
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/* sort change-point list by memory addresses (low -> high) */
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still_changing = 1;
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while (still_changing) {
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still_changing = 0;
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for (i=1; i < chg_nr; i++) {
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/* if <current_addr> > <last_addr>, swap */
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/* or, if current=<start_addr> & last=<end_addr>, swap */
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if ((change_point[i]->addr < change_point[i-1]->addr) ||
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((change_point[i]->addr == change_point[i-1]->addr) &&
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(change_point[i]->addr == change_point[i]->pbios->addr) &&
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(change_point[i-1]->addr != change_point[i-1]->pbios->addr))
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)
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{
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change_tmp = change_point[i];
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change_point[i] = change_point[i-1];
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change_point[i-1] = change_tmp;
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still_changing=1;
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}
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}
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}
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/* create a new bios memory map, removing overlaps */
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overlap_entries=0; /* number of entries in the overlap table */
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new_bios_entry=0; /* index for creating new bios map entries */
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last_type = 0; /* start with undefined memory type */
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last_addr = 0; /* start with 0 as last starting address */
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/* loop through change-points, determining affect on the new bios map */
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for (chgidx=0; chgidx < chg_nr; chgidx++)
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{
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/* keep track of all overlapping bios entries */
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if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr)
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{
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/* add map entry to overlap list (> 1 entry implies an overlap) */
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overlap_list[overlap_entries++]=change_point[chgidx]->pbios;
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}
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else
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{
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/* remove entry from list (order independent, so swap with last) */
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for (i=0; i<overlap_entries; i++)
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{
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if (overlap_list[i] == change_point[chgidx]->pbios)
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overlap_list[i] = overlap_list[overlap_entries-1];
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}
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overlap_entries--;
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}
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/* if there are overlapping entries, decide which "type" to use */
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/* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
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current_type = 0;
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for (i=0; i<overlap_entries; i++)
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if (overlap_list[i]->type > current_type)
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current_type = overlap_list[i]->type;
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/* continue building up new bios map based on this information */
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if (current_type != last_type) {
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if (last_type != 0) {
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new_bios[new_bios_entry].size =
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change_point[chgidx]->addr - last_addr;
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/* move forward only if the new size was non-zero */
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if (new_bios[new_bios_entry].size != 0)
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if (++new_bios_entry >= E820MAX)
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break; /* no more space left for new bios entries */
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}
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if (current_type != 0) {
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new_bios[new_bios_entry].addr = change_point[chgidx]->addr;
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new_bios[new_bios_entry].type = current_type;
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last_addr=change_point[chgidx]->addr;
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}
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last_type = current_type;
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}
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}
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new_nr = new_bios_entry; /* retain count for new bios entries */
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/* copy new bios mapping into original location */
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memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry));
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*pnr_map = new_nr;
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return 0;
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}
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/*
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* Copy the BIOS e820 map into a safe place.
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*
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* Sanity-check it while we're at it..
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*
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* If we're lucky and live on a modern system, the setup code
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* will have given us a memory map that we can use to properly
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* set up memory. If we aren't, we'll fake a memory map.
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*
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* We check to see that the memory map contains at least 2 elements
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* before we'll use it, because the detection code in setup.S may
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* not be perfect and most every PC known to man has two memory
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* regions: one from 0 to 640k, and one from 1mb up. (The IBM
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* thinkpad 560x, for example, does not cooperate with the memory
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* detection code.)
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*/
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int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
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{
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/* Only one memory region (or negative)? Ignore it */
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if (nr_map < 2)
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return -1;
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do {
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unsigned long long start = biosmap->addr;
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unsigned long long size = biosmap->size;
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unsigned long long end = start + size;
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unsigned long type = biosmap->type;
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/* Overflow in 64 bits? Ignore the memory map. */
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if (start > end)
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return -1;
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/*
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* Some BIOSes claim RAM in the 640k - 1M region.
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* Not right. Fix it up.
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*/
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if (type == E820_RAM) {
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if (start < 0x100000ULL && end > 0xA0000ULL) {
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if (start < 0xA0000ULL)
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add_memory_region(start, 0xA0000ULL-start, type);
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if (end <= 0x100000ULL)
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continue;
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start = 0x100000ULL;
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size = end - start;
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}
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}
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add_memory_region(start, size, type);
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} while (biosmap++,--nr_map);
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return 0;
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}
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/*
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* Find the highest page frame number we have available
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*/
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void __init find_max_pfn(void)
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{
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int i;
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max_pfn = 0;
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for (i = 0; i < e820.nr_map; i++) {
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unsigned long start, end;
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/* RAM? */
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if (e820.map[i].type != E820_RAM)
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continue;
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start = PFN_UP(e820.map[i].addr);
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end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
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if (start >= end)
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continue;
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if (end > max_pfn)
|
|
max_pfn = end;
|
|
memory_present(0, start, end);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Register fully available low RAM pages with the bootmem allocator.
|
|
*/
|
|
void __init register_bootmem_low_pages(unsigned long max_low_pfn)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
unsigned long curr_pfn, last_pfn, size;
|
|
/*
|
|
* Reserve usable low memory
|
|
*/
|
|
if (e820.map[i].type != E820_RAM)
|
|
continue;
|
|
/*
|
|
* We are rounding up the start address of usable memory:
|
|
*/
|
|
curr_pfn = PFN_UP(e820.map[i].addr);
|
|
if (curr_pfn >= max_low_pfn)
|
|
continue;
|
|
/*
|
|
* ... and at the end of the usable range downwards:
|
|
*/
|
|
last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
|
|
|
|
if (last_pfn > max_low_pfn)
|
|
last_pfn = max_low_pfn;
|
|
|
|
/*
|
|
* .. finally, did all the rounding and playing
|
|
* around just make the area go away?
|
|
*/
|
|
if (last_pfn <= curr_pfn)
|
|
continue;
|
|
|
|
size = last_pfn - curr_pfn;
|
|
free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
|
|
}
|
|
}
|
|
|
|
void __init e820_register_memory(void)
|
|
{
|
|
unsigned long gapstart, gapsize, round;
|
|
unsigned long long last;
|
|
int i;
|
|
|
|
/*
|
|
* Search for the biggest gap in the low 32 bits of the e820
|
|
* memory space.
|
|
*/
|
|
last = 0x100000000ull;
|
|
gapstart = 0x10000000;
|
|
gapsize = 0x400000;
|
|
i = e820.nr_map;
|
|
while (--i >= 0) {
|
|
unsigned long long start = e820.map[i].addr;
|
|
unsigned long long end = start + e820.map[i].size;
|
|
|
|
/*
|
|
* Since "last" is at most 4GB, we know we'll
|
|
* fit in 32 bits if this condition is true
|
|
*/
|
|
if (last > end) {
|
|
unsigned long gap = last - end;
|
|
|
|
if (gap > gapsize) {
|
|
gapsize = gap;
|
|
gapstart = end;
|
|
}
|
|
}
|
|
if (start < last)
|
|
last = start;
|
|
}
|
|
|
|
/*
|
|
* See how much we want to round up: start off with
|
|
* rounding to the next 1MB area.
|
|
*/
|
|
round = 0x100000;
|
|
while ((gapsize >> 4) > round)
|
|
round += round;
|
|
/* Fun with two's complement */
|
|
pci_mem_start = (gapstart + round) & -round;
|
|
|
|
printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
|
|
pci_mem_start, gapstart, gapsize);
|
|
}
|
|
|
|
void __init print_memory_map(char *who)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
printk(" %s: %016Lx - %016Lx ", who,
|
|
e820.map[i].addr,
|
|
e820.map[i].addr + e820.map[i].size);
|
|
switch (e820.map[i].type) {
|
|
case E820_RAM: printk("(usable)\n");
|
|
break;
|
|
case E820_RESERVED:
|
|
printk("(reserved)\n");
|
|
break;
|
|
case E820_ACPI:
|
|
printk("(ACPI data)\n");
|
|
break;
|
|
case E820_NVS:
|
|
printk("(ACPI NVS)\n");
|
|
break;
|
|
default: printk("type %u\n", e820.map[i].type);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void __init limit_regions(unsigned long long size)
|
|
{
|
|
unsigned long long current_addr;
|
|
int i;
|
|
|
|
print_memory_map("limit_regions start");
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
current_addr = e820.map[i].addr + e820.map[i].size;
|
|
if (current_addr < size)
|
|
continue;
|
|
|
|
if (e820.map[i].type != E820_RAM)
|
|
continue;
|
|
|
|
if (e820.map[i].addr >= size) {
|
|
/*
|
|
* This region starts past the end of the
|
|
* requested size, skip it completely.
|
|
*/
|
|
e820.nr_map = i;
|
|
} else {
|
|
e820.nr_map = i + 1;
|
|
e820.map[i].size -= current_addr - size;
|
|
}
|
|
print_memory_map("limit_regions endfor");
|
|
return;
|
|
}
|
|
print_memory_map("limit_regions endfunc");
|
|
}
|
|
|
|
/*
|
|
* This function checks if any part of the range <start,end> is mapped
|
|
* with type.
|
|
*/
|
|
int
|
|
e820_any_mapped(u64 start, u64 end, unsigned type)
|
|
{
|
|
int i;
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
const struct e820entry *ei = &e820.map[i];
|
|
if (type && ei->type != type)
|
|
continue;
|
|
if (ei->addr >= end || ei->addr + ei->size <= start)
|
|
continue;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(e820_any_mapped);
|
|
|
|
/*
|
|
* This function checks if the entire range <start,end> is mapped with type.
|
|
*
|
|
* Note: this function only works correct if the e820 table is sorted and
|
|
* not-overlapping, which is the case
|
|
*/
|
|
int __init
|
|
e820_all_mapped(unsigned long s, unsigned long e, unsigned type)
|
|
{
|
|
u64 start = s;
|
|
u64 end = e;
|
|
int i;
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
struct e820entry *ei = &e820.map[i];
|
|
if (type && ei->type != type)
|
|
continue;
|
|
/* is the region (part) in overlap with the current region ?*/
|
|
if (ei->addr >= end || ei->addr + ei->size <= start)
|
|
continue;
|
|
/* if the region is at the beginning of <start,end> we move
|
|
* start to the end of the region since it's ok until there
|
|
*/
|
|
if (ei->addr <= start)
|
|
start = ei->addr + ei->size;
|
|
/* if start is now at or beyond end, we're done, full
|
|
* coverage */
|
|
if (start >= end)
|
|
return 1; /* we're done */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init parse_memmap(char *arg)
|
|
{
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
if (strcmp(arg, "exactmap") == 0) {
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
/* If we are doing a crash dump, we
|
|
* still need to know the real mem
|
|
* size before original memory map is
|
|
* reset.
|
|
*/
|
|
find_max_pfn();
|
|
saved_max_pfn = max_pfn;
|
|
#endif
|
|
e820.nr_map = 0;
|
|
user_defined_memmap = 1;
|
|
} else {
|
|
/* If the user specifies memory size, we
|
|
* limit the BIOS-provided memory map to
|
|
* that size. exactmap can be used to specify
|
|
* the exact map. mem=number can be used to
|
|
* trim the existing memory map.
|
|
*/
|
|
unsigned long long start_at, mem_size;
|
|
|
|
mem_size = memparse(arg, &arg);
|
|
if (*arg == '@') {
|
|
start_at = memparse(arg+1, &arg);
|
|
add_memory_region(start_at, mem_size, E820_RAM);
|
|
} else if (*arg == '#') {
|
|
start_at = memparse(arg+1, &arg);
|
|
add_memory_region(start_at, mem_size, E820_ACPI);
|
|
} else if (*arg == '$') {
|
|
start_at = memparse(arg+1, &arg);
|
|
add_memory_region(start_at, mem_size, E820_RESERVED);
|
|
} else {
|
|
limit_regions(mem_size);
|
|
user_defined_memmap = 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
early_param("memmap", parse_memmap);
|
|
void __init update_memory_range(u64 start, u64 size, unsigned old_type,
|
|
unsigned new_type)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(old_type == new_type);
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
struct e820entry *ei = &e820.map[i];
|
|
u64 final_start, final_end;
|
|
if (ei->type != old_type)
|
|
continue;
|
|
/* totally covered? */
|
|
if (ei->addr >= start && ei->size <= size) {
|
|
ei->type = new_type;
|
|
continue;
|
|
}
|
|
/* partially covered */
|
|
final_start = max(start, ei->addr);
|
|
final_end = min(start + size, ei->addr + ei->size);
|
|
if (final_start >= final_end)
|
|
continue;
|
|
add_memory_region(final_start, final_end - final_start,
|
|
new_type);
|
|
}
|
|
}
|
|
void __init update_e820(void)
|
|
{
|
|
u8 nr_map;
|
|
|
|
nr_map = e820.nr_map;
|
|
if (sanitize_e820_map(e820.map, &nr_map))
|
|
return;
|
|
e820.nr_map = nr_map;
|
|
printk(KERN_INFO "modified physical RAM map:\n");
|
|
print_memory_map("modified");
|
|
}
|