b5b2405706
This patch moves e820/efi memmap table walking function from setup.c to e820.c, also this patch adds extern declaration in header file. Signed-off-by: bibo,mao <bibo.mao@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> arch/i386/kernel/e820.c | 115 +++++++++++++++++++++++++++++++++ arch/i386/kernel/setup.c | 118 ----------------------------------- include/asm-i386/e820.h | 2 arch/i386/kernel/e820.c | 115 +++++++++++++++++++++++++++++++++++++++++++++ arch/i386/kernel/setup.c | 118 ----------------------------------------------- include/asm-i386/e820.h | 2 3 files changed, 117 insertions(+), 118 deletions(-)
708 lines
18 KiB
C
708 lines
18 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/efi.h>
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#include <linux/pfn.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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#ifdef CONFIG_EFI
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int efi_enabled = 0;
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EXPORT_SYMBOL(efi_enabled);
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#endif
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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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struct resource data_resource = {
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.name = "Kernel data",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM
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};
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struct resource code_resource = {
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.name = "Kernel code",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM
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};
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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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static struct resource video_ram_resource = {
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.name = "Video RAM area",
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.start = 0xa0000,
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.end = 0xbffff,
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM
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};
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static struct resource standard_io_resources[] = { {
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.name = "dma1",
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.start = 0x0000,
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.end = 0x001f,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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}, {
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.name = "pic1",
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.start = 0x0020,
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.end = 0x0021,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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}, {
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.name = "timer0",
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.start = 0x0040,
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.end = 0x0043,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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}, {
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.name = "timer1",
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.start = 0x0050,
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.end = 0x0053,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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}, {
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.name = "keyboard",
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.start = 0x0060,
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.end = 0x006f,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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}, {
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.name = "dma page reg",
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.start = 0x0080,
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.end = 0x008f,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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}, {
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.name = "pic2",
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.start = 0x00a0,
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.end = 0x00a1,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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}, {
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.name = "dma2",
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.start = 0x00c0,
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.end = 0x00df,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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}, {
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.name = "fpu",
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.start = 0x00f0,
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.end = 0x00ff,
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.flags = IORESOURCE_BUSY | IORESOURCE_IO
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} };
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#define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
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static int __init romchecksum(unsigned char *rom, unsigned long length)
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{
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unsigned char *p, sum = 0;
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for (p = rom; p < rom + length; p++)
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sum += *p;
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return sum == 0;
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}
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static void __init probe_roms(void)
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{
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unsigned long start, length, upper;
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unsigned char *rom;
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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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/* 0 < length <= 0x7f * 512, historically */
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length = rom[2] * 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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/* 0 < length <= 0x7f * 512, historically */
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length = rom[2] * 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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static void __init
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legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_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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#ifdef CONFIG_KEXEC
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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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/*
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* Request address space for all standard resources
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*
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* This is called just before pcibios_init(), which is also a
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* subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
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*/
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static int __init request_standard_resources(void)
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{
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int i;
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printk("Setting up standard PCI resources\n");
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if (efi_enabled)
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efi_initialize_iomem_resources(&code_resource, &data_resource);
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else
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legacy_init_iomem_resources(&code_resource, &data_resource);
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/* EFI systems may still have VGA */
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request_resource(&iomem_resource, &video_ram_resource);
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/* request I/O space for devices used on all i[345]86 PCs */
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for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
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request_resource(&ioport_resource, &standard_io_resources[i]);
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return 0;
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}
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subsys_initcall(request_standard_resources);
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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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if (!efi_enabled) {
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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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}
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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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printk("sanitize start\n");
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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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printk("sanitize bail 0\n");
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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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printk("sanitize bail 1\n");
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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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printk("sanitize end\n");
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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
|
|
* set up memory. If we aren't, we'll fake a memory map.
|
|
*
|
|
* We check to see that the memory map contains at least 2 elements
|
|
* before we'll use it, because the detection code in setup.S may
|
|
* not be perfect and most every PC known to man has two memory
|
|
* regions: one from 0 to 640k, and one from 1mb up. (The IBM
|
|
* thinkpad 560x, for example, does not cooperate with the memory
|
|
* detection code.)
|
|
*/
|
|
int __init copy_e820_map(struct e820entry * biosmap, int nr_map)
|
|
{
|
|
/* Only one memory region (or negative)? Ignore it */
|
|
if (nr_map < 2)
|
|
return -1;
|
|
|
|
do {
|
|
unsigned long long start = biosmap->addr;
|
|
unsigned long long size = biosmap->size;
|
|
unsigned long long end = start + size;
|
|
unsigned long type = biosmap->type;
|
|
printk("copy_e820_map() start: %016Lx size: %016Lx end: %016Lx type: %ld\n", start, size, end, type);
|
|
|
|
/* Overflow in 64 bits? Ignore the memory map. */
|
|
if (start > end)
|
|
return -1;
|
|
|
|
/*
|
|
* Some BIOSes claim RAM in the 640k - 1M region.
|
|
* Not right. Fix it up.
|
|
*/
|
|
if (type == E820_RAM) {
|
|
printk("copy_e820_map() type is E820_RAM\n");
|
|
if (start < 0x100000ULL && end > 0xA0000ULL) {
|
|
printk("copy_e820_map() lies in range...\n");
|
|
if (start < 0xA0000ULL) {
|
|
printk("copy_e820_map() start < 0xA0000ULL\n");
|
|
add_memory_region(start, 0xA0000ULL-start, type);
|
|
}
|
|
if (end <= 0x100000ULL) {
|
|
printk("copy_e820_map() end <= 0x100000ULL\n");
|
|
continue;
|
|
}
|
|
start = 0x100000ULL;
|
|
size = end - start;
|
|
}
|
|
}
|
|
add_memory_region(start, size, type);
|
|
} while (biosmap++,--nr_map);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Callback for efi_memory_walk.
|
|
*/
|
|
static int __init
|
|
efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
|
|
{
|
|
unsigned long *max_pfn = arg, pfn;
|
|
|
|
if (start < end) {
|
|
pfn = PFN_UP(end -1);
|
|
if (pfn > *max_pfn)
|
|
*max_pfn = pfn;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init
|
|
efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
|
|
{
|
|
memory_present(0, PFN_UP(start), PFN_DOWN(end));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the highest page frame number we have available
|
|
*/
|
|
void __init find_max_pfn(void)
|
|
{
|
|
int i;
|
|
|
|
max_pfn = 0;
|
|
if (efi_enabled) {
|
|
efi_memmap_walk(efi_find_max_pfn, &max_pfn);
|
|
efi_memmap_walk(efi_memory_present_wrapper, NULL);
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
unsigned long start, end;
|
|
/* RAM? */
|
|
if (e820.map[i].type != E820_RAM)
|
|
continue;
|
|
start = PFN_UP(e820.map[i].addr);
|
|
end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
|
|
if (start >= end)
|
|
continue;
|
|
if (end > max_pfn)
|
|
max_pfn = end;
|
|
memory_present(0, start, end);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free all available memory for boot time allocation. Used
|
|
* as a callback function by efi_memory_walk()
|
|
*/
|
|
|
|
static int __init
|
|
free_available_memory(unsigned long start, unsigned long end, void *arg)
|
|
{
|
|
/* check max_low_pfn */
|
|
if (start >= (max_low_pfn << PAGE_SHIFT))
|
|
return 0;
|
|
if (end >= (max_low_pfn << PAGE_SHIFT))
|
|
end = max_low_pfn << PAGE_SHIFT;
|
|
if (start < end)
|
|
free_bootmem(start, end - start);
|
|
|
|
return 0;
|
|
}
|
|
/*
|
|
* Register fully available low RAM pages with the bootmem allocator.
|
|
*/
|
|
void __init register_bootmem_low_pages(unsigned long max_low_pfn)
|
|
{
|
|
int i;
|
|
|
|
if (efi_enabled) {
|
|
efi_memmap_walk(free_available_memory, NULL);
|
|
return;
|
|
}
|
|
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 register_memory(void)
|
|
{
|
|
unsigned long gapstart, gapsize, round;
|
|
unsigned long long last;
|
|
int i;
|
|
|
|
/*
|
|
* Search for the bigest 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);
|
|
}
|