![Vivek Goyal](/assets/img/avatar_default.png)
- elfcorehdr= specifies the location of elf core header stored by the crashed kernel. This command line option will be passed by the kexec-tools to capture kernel. Changes in this version : - Added more comments in kernel-parameters.txt and in code. Signed-off-by: Murali M Chakravarthy <muralim@in.ibm.com> Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1641 lines
42 KiB
C
1641 lines
42 KiB
C
/*
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* linux/arch/i386/kernel/setup.c
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*
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* Copyright (C) 1995 Linus Torvalds
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*
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
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*
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* Memory region support
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* David Parsons <orc@pell.chi.il.us>, July-August 1999
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*
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* Added E820 sanitization routine (removes overlapping memory regions);
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* Brian Moyle <bmoyle@mvista.com>, February 2001
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*
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* Moved CPU detection code to cpu/${cpu}.c
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* Patrick Mochel <mochel@osdl.org>, March 2002
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*
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* Provisions for empty E820 memory regions (reported by certain BIOSes).
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* Alex Achenbach <xela@slit.de>, December 2002.
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*
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*/
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/*
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* This file handles the architecture-dependent parts of initialization
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/tty.h>
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#include <linux/ioport.h>
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#include <linux/acpi.h>
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#include <linux/apm_bios.h>
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#include <linux/initrd.h>
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#include <linux/bootmem.h>
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#include <linux/seq_file.h>
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#include <linux/console.h>
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#include <linux/mca.h>
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#include <linux/root_dev.h>
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <linux/efi.h>
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#include <linux/init.h>
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#include <linux/edd.h>
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#include <linux/nodemask.h>
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#include <linux/kexec.h>
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#include <linux/crash_dump.h>
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#include <video/edid.h>
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#include <asm/apic.h>
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#include <asm/e820.h>
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#include <asm/mpspec.h>
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#include <asm/setup.h>
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#include <asm/arch_hooks.h>
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#include <asm/sections.h>
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#include <asm/io_apic.h>
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#include <asm/ist.h>
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#include <asm/io.h>
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#include "setup_arch_pre.h"
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#include <bios_ebda.h>
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/* Forward Declaration. */
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void __init find_max_pfn(void);
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/* This value is set up by the early boot code to point to the value
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immediately after the boot time page tables. It contains a *physical*
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address, and must not be in the .bss segment! */
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unsigned long init_pg_tables_end __initdata = ~0UL;
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int disable_pse __devinitdata = 0;
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/*
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* Machine setup..
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*/
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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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/* cpu data as detected by the assembly code in head.S */
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struct cpuinfo_x86 new_cpu_data __initdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
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/* common cpu data for all cpus */
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struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
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EXPORT_SYMBOL(boot_cpu_data);
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unsigned long mmu_cr4_features;
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#ifdef CONFIG_ACPI
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int acpi_disabled = 0;
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#else
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int acpi_disabled = 1;
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#endif
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EXPORT_SYMBOL(acpi_disabled);
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#ifdef CONFIG_ACPI
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int __initdata acpi_force = 0;
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extern acpi_interrupt_flags acpi_sci_flags;
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#endif
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/* for MCA, but anyone else can use it if they want */
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unsigned int machine_id;
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#ifdef CONFIG_MCA
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EXPORT_SYMBOL(machine_id);
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#endif
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unsigned int machine_submodel_id;
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unsigned int BIOS_revision;
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unsigned int mca_pentium_flag;
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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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/* Boot loader ID as an integer, for the benefit of proc_dointvec */
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int bootloader_type;
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/* user-defined highmem size */
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static unsigned int highmem_pages = -1;
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/*
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* Setup options
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*/
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struct drive_info_struct { char dummy[32]; } drive_info;
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#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_HD) || \
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defined(CONFIG_BLK_DEV_IDE_MODULE) || defined(CONFIG_BLK_DEV_HD_MODULE)
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EXPORT_SYMBOL(drive_info);
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#endif
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struct screen_info screen_info;
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EXPORT_SYMBOL(screen_info);
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struct apm_info apm_info;
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EXPORT_SYMBOL(apm_info);
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struct sys_desc_table_struct {
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unsigned short length;
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unsigned char table[0];
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};
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struct edid_info edid_info;
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EXPORT_SYMBOL_GPL(edid_info);
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struct ist_info ist_info;
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#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
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defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
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EXPORT_SYMBOL(ist_info);
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#endif
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struct e820map e820;
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extern void early_cpu_init(void);
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extern void dmi_scan_machine(void);
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extern void generic_apic_probe(char *);
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extern int root_mountflags;
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unsigned long saved_videomode;
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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static char command_line[COMMAND_LINE_SIZE];
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unsigned char __initdata boot_params[PARAM_SIZE];
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static 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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static 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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#define ADAPTER_ROM_RESOURCES \
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(sizeof adapter_rom_resources / sizeof adapter_rom_resources[0])
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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 STANDARD_IO_RESOURCES \
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(sizeof standard_io_resources / sizeof standard_io_resources[0])
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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 < 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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static void __init limit_regions(unsigned long long size)
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{
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unsigned long long current_addr = 0;
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int i;
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if (efi_enabled) {
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efi_memory_desc_t *md;
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void *p;
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for (p = memmap.map, i = 0; p < memmap.map_end;
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p += memmap.desc_size, i++) {
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md = p;
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current_addr = md->phys_addr + (md->num_pages << 12);
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if (md->type == EFI_CONVENTIONAL_MEMORY) {
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if (current_addr >= size) {
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md->num_pages -=
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(((current_addr-size) + PAGE_SIZE-1) >> PAGE_SHIFT);
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memmap.nr_map = i + 1;
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return;
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}
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}
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}
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}
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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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return;
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}
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}
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static 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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#define E820_DEBUG 1
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static void __init print_memory_map(char *who)
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{
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int i;
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for (i = 0; i < e820.nr_map; i++) {
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printk(" %s: %016Lx - %016Lx ", who,
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e820.map[i].addr,
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e820.map[i].addr + e820.map[i].size);
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switch (e820.map[i].type) {
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case E820_RAM: printk("(usable)\n");
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break;
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case E820_RESERVED:
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printk("(reserved)\n");
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break;
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case E820_ACPI:
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printk("(ACPI data)\n");
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break;
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case E820_NVS:
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printk("(ACPI NVS)\n");
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break;
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default: printk("type %lu\n", e820.map[i].type);
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break;
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}
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}
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}
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|
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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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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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static 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__
|
|
______________________4_
|
|
*/
|
|
|
|
/* if there's only one memory region, don't bother */
|
|
if (*pnr_map < 2)
|
|
return -1;
|
|
|
|
old_nr = *pnr_map;
|
|
|
|
/* bail out if we find any unreasonable addresses in bios map */
|
|
for (i=0; i<old_nr; i++)
|
|
if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
|
|
return -1;
|
|
|
|
/* create pointers for initial change-point information (for sorting) */
|
|
for (i=0; i < 2*old_nr; i++)
|
|
change_point[i] = &change_point_list[i];
|
|
|
|
/* record all known change-points (starting and ending addresses),
|
|
omitting those that are for empty memory regions */
|
|
chgidx = 0;
|
|
for (i=0; i < old_nr; i++) {
|
|
if (biosmap[i].size != 0) {
|
|
change_point[chgidx]->addr = biosmap[i].addr;
|
|
change_point[chgidx++]->pbios = &biosmap[i];
|
|
change_point[chgidx]->addr = biosmap[i].addr + biosmap[i].size;
|
|
change_point[chgidx++]->pbios = &biosmap[i];
|
|
}
|
|
}
|
|
chg_nr = chgidx; /* true number of change-points */
|
|
|
|
/* sort change-point list by memory addresses (low -> high) */
|
|
still_changing = 1;
|
|
while (still_changing) {
|
|
still_changing = 0;
|
|
for (i=1; i < chg_nr; i++) {
|
|
/* if <current_addr> > <last_addr>, swap */
|
|
/* or, if current=<start_addr> & last=<end_addr>, swap */
|
|
if ((change_point[i]->addr < change_point[i-1]->addr) ||
|
|
((change_point[i]->addr == change_point[i-1]->addr) &&
|
|
(change_point[i]->addr == change_point[i]->pbios->addr) &&
|
|
(change_point[i-1]->addr != change_point[i-1]->pbios->addr))
|
|
)
|
|
{
|
|
change_tmp = change_point[i];
|
|
change_point[i] = change_point[i-1];
|
|
change_point[i-1] = change_tmp;
|
|
still_changing=1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* create a new bios memory map, removing overlaps */
|
|
overlap_entries=0; /* number of entries in the overlap table */
|
|
new_bios_entry=0; /* index for creating new bios map entries */
|
|
last_type = 0; /* start with undefined memory type */
|
|
last_addr = 0; /* start with 0 as last starting address */
|
|
/* loop through change-points, determining affect on the new bios map */
|
|
for (chgidx=0; chgidx < chg_nr; chgidx++)
|
|
{
|
|
/* keep track of all overlapping bios entries */
|
|
if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr)
|
|
{
|
|
/* add map entry to overlap list (> 1 entry implies an overlap) */
|
|
overlap_list[overlap_entries++]=change_point[chgidx]->pbios;
|
|
}
|
|
else
|
|
{
|
|
/* remove entry from list (order independent, so swap with last) */
|
|
for (i=0; i<overlap_entries; i++)
|
|
{
|
|
if (overlap_list[i] == change_point[chgidx]->pbios)
|
|
overlap_list[i] = overlap_list[overlap_entries-1];
|
|
}
|
|
overlap_entries--;
|
|
}
|
|
/* if there are overlapping entries, decide which "type" to use */
|
|
/* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
|
|
current_type = 0;
|
|
for (i=0; i<overlap_entries; i++)
|
|
if (overlap_list[i]->type > current_type)
|
|
current_type = overlap_list[i]->type;
|
|
/* continue building up new bios map based on this information */
|
|
if (current_type != last_type) {
|
|
if (last_type != 0) {
|
|
new_bios[new_bios_entry].size =
|
|
change_point[chgidx]->addr - last_addr;
|
|
/* move forward only if the new size was non-zero */
|
|
if (new_bios[new_bios_entry].size != 0)
|
|
if (++new_bios_entry >= E820MAX)
|
|
break; /* no more space left for new bios entries */
|
|
}
|
|
if (current_type != 0) {
|
|
new_bios[new_bios_entry].addr = change_point[chgidx]->addr;
|
|
new_bios[new_bios_entry].type = current_type;
|
|
last_addr=change_point[chgidx]->addr;
|
|
}
|
|
last_type = current_type;
|
|
}
|
|
}
|
|
new_nr = new_bios_entry; /* retain count for new bios entries */
|
|
|
|
/* copy new bios mapping into original location */
|
|
memcpy(biosmap, new_bios, new_nr*sizeof(struct e820entry));
|
|
*pnr_map = new_nr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Copy the BIOS e820 map into a safe place.
|
|
*
|
|
* Sanity-check it while we're at it..
|
|
*
|
|
* If we're lucky and live on a modern system, the setup code
|
|
* 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.)
|
|
*/
|
|
static 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;
|
|
|
|
/* 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) {
|
|
if (start < 0x100000ULL && end > 0xA0000ULL) {
|
|
if (start < 0xA0000ULL)
|
|
add_memory_region(start, 0xA0000ULL-start, type);
|
|
if (end <= 0x100000ULL)
|
|
continue;
|
|
start = 0x100000ULL;
|
|
size = end - start;
|
|
}
|
|
}
|
|
add_memory_region(start, size, type);
|
|
} while (biosmap++,--nr_map);
|
|
return 0;
|
|
}
|
|
|
|
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
|
|
struct edd edd;
|
|
#ifdef CONFIG_EDD_MODULE
|
|
EXPORT_SYMBOL(edd);
|
|
#endif
|
|
/**
|
|
* copy_edd() - Copy the BIOS EDD information
|
|
* from boot_params into a safe place.
|
|
*
|
|
*/
|
|
static inline void copy_edd(void)
|
|
{
|
|
memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
|
|
memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
|
|
edd.mbr_signature_nr = EDD_MBR_SIG_NR;
|
|
edd.edd_info_nr = EDD_NR;
|
|
}
|
|
#else
|
|
static inline void copy_edd(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Do NOT EVER look at the BIOS memory size location.
|
|
* It does not work on many machines.
|
|
*/
|
|
#define LOWMEMSIZE() (0x9f000)
|
|
|
|
static void __init parse_cmdline_early (char ** cmdline_p)
|
|
{
|
|
char c = ' ', *to = command_line, *from = saved_command_line;
|
|
int len = 0;
|
|
int userdef = 0;
|
|
|
|
/* Save unparsed command line copy for /proc/cmdline */
|
|
saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
|
|
|
|
for (;;) {
|
|
if (c != ' ')
|
|
goto next_char;
|
|
/*
|
|
* "mem=nopentium" disables the 4MB page tables.
|
|
* "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
|
|
* to <mem>, overriding the bios size.
|
|
* "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
|
|
* <start> to <start>+<mem>, overriding the bios size.
|
|
*
|
|
* HPA tells me bootloaders need to parse mem=, so no new
|
|
* option should be mem= [also see Documentation/i386/boot.txt]
|
|
*/
|
|
if (!memcmp(from, "mem=", 4)) {
|
|
if (to != command_line)
|
|
to--;
|
|
if (!memcmp(from+4, "nopentium", 9)) {
|
|
from += 9+4;
|
|
clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
|
|
disable_pse = 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 mem_size;
|
|
|
|
mem_size = memparse(from+4, &from);
|
|
limit_regions(mem_size);
|
|
userdef=1;
|
|
}
|
|
}
|
|
|
|
else if (!memcmp(from, "memmap=", 7)) {
|
|
if (to != command_line)
|
|
to--;
|
|
if (!memcmp(from+7, "exactmap", 8)) {
|
|
#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
|
|
from += 8+7;
|
|
e820.nr_map = 0;
|
|
userdef = 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(from+7, &from);
|
|
if (*from == '@') {
|
|
start_at = memparse(from+1, &from);
|
|
add_memory_region(start_at, mem_size, E820_RAM);
|
|
} else if (*from == '#') {
|
|
start_at = memparse(from+1, &from);
|
|
add_memory_region(start_at, mem_size, E820_ACPI);
|
|
} else if (*from == '$') {
|
|
start_at = memparse(from+1, &from);
|
|
add_memory_region(start_at, mem_size, E820_RESERVED);
|
|
} else {
|
|
limit_regions(mem_size);
|
|
userdef=1;
|
|
}
|
|
}
|
|
}
|
|
|
|
else if (!memcmp(from, "noexec=", 7))
|
|
noexec_setup(from + 7);
|
|
|
|
|
|
#ifdef CONFIG_X86_SMP
|
|
/*
|
|
* If the BIOS enumerates physical processors before logical,
|
|
* maxcpus=N at enumeration-time can be used to disable HT.
|
|
*/
|
|
else if (!memcmp(from, "maxcpus=", 8)) {
|
|
extern unsigned int maxcpus;
|
|
|
|
maxcpus = simple_strtoul(from + 8, NULL, 0);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ACPI
|
|
/* "acpi=off" disables both ACPI table parsing and interpreter */
|
|
else if (!memcmp(from, "acpi=off", 8)) {
|
|
disable_acpi();
|
|
}
|
|
|
|
/* acpi=force to over-ride black-list */
|
|
else if (!memcmp(from, "acpi=force", 10)) {
|
|
acpi_force = 1;
|
|
acpi_ht = 1;
|
|
acpi_disabled = 0;
|
|
}
|
|
|
|
/* acpi=strict disables out-of-spec workarounds */
|
|
else if (!memcmp(from, "acpi=strict", 11)) {
|
|
acpi_strict = 1;
|
|
}
|
|
|
|
/* Limit ACPI just to boot-time to enable HT */
|
|
else if (!memcmp(from, "acpi=ht", 7)) {
|
|
if (!acpi_force)
|
|
disable_acpi();
|
|
acpi_ht = 1;
|
|
}
|
|
|
|
/* "pci=noacpi" disable ACPI IRQ routing and PCI scan */
|
|
else if (!memcmp(from, "pci=noacpi", 10)) {
|
|
acpi_disable_pci();
|
|
}
|
|
/* "acpi=noirq" disables ACPI interrupt routing */
|
|
else if (!memcmp(from, "acpi=noirq", 10)) {
|
|
acpi_noirq_set();
|
|
}
|
|
|
|
else if (!memcmp(from, "acpi_sci=edge", 13))
|
|
acpi_sci_flags.trigger = 1;
|
|
|
|
else if (!memcmp(from, "acpi_sci=level", 14))
|
|
acpi_sci_flags.trigger = 3;
|
|
|
|
else if (!memcmp(from, "acpi_sci=high", 13))
|
|
acpi_sci_flags.polarity = 1;
|
|
|
|
else if (!memcmp(from, "acpi_sci=low", 12))
|
|
acpi_sci_flags.polarity = 3;
|
|
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
else if (!memcmp(from, "acpi_skip_timer_override", 24))
|
|
acpi_skip_timer_override = 1;
|
|
|
|
if (!memcmp(from, "disable_timer_pin_1", 19))
|
|
disable_timer_pin_1 = 1;
|
|
if (!memcmp(from, "enable_timer_pin_1", 18))
|
|
disable_timer_pin_1 = -1;
|
|
|
|
/* disable IO-APIC */
|
|
else if (!memcmp(from, "noapic", 6))
|
|
disable_ioapic_setup();
|
|
#endif /* CONFIG_X86_IO_APIC */
|
|
#endif /* CONFIG_ACPI */
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
/* enable local APIC */
|
|
else if (!memcmp(from, "lapic", 5))
|
|
lapic_enable();
|
|
|
|
/* disable local APIC */
|
|
else if (!memcmp(from, "nolapic", 6))
|
|
lapic_disable();
|
|
#endif /* CONFIG_X86_LOCAL_APIC */
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
/* crashkernel=size@addr specifies the location to reserve for
|
|
* a crash kernel. By reserving this memory we guarantee
|
|
* that linux never set's it up as a DMA target.
|
|
* Useful for holding code to do something appropriate
|
|
* after a kernel panic.
|
|
*/
|
|
else if (!memcmp(from, "crashkernel=", 12)) {
|
|
unsigned long size, base;
|
|
size = memparse(from+12, &from);
|
|
if (*from == '@') {
|
|
base = memparse(from+1, &from);
|
|
/* FIXME: Do I want a sanity check
|
|
* to validate the memory range?
|
|
*/
|
|
crashk_res.start = base;
|
|
crashk_res.end = base + size - 1;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_PROC_VMCORE
|
|
/* elfcorehdr= specifies the location of elf core header
|
|
* stored by the crashed kernel.
|
|
*/
|
|
else if (!memcmp(from, "elfcorehdr=", 11))
|
|
elfcorehdr_addr = memparse(from+11, &from);
|
|
#endif
|
|
|
|
/*
|
|
* highmem=size forces highmem to be exactly 'size' bytes.
|
|
* This works even on boxes that have no highmem otherwise.
|
|
* This also works to reduce highmem size on bigger boxes.
|
|
*/
|
|
else if (!memcmp(from, "highmem=", 8))
|
|
highmem_pages = memparse(from+8, &from) >> PAGE_SHIFT;
|
|
|
|
/*
|
|
* vmalloc=size forces the vmalloc area to be exactly 'size'
|
|
* bytes. This can be used to increase (or decrease) the
|
|
* vmalloc area - the default is 128m.
|
|
*/
|
|
else if (!memcmp(from, "vmalloc=", 8))
|
|
__VMALLOC_RESERVE = memparse(from+8, &from);
|
|
|
|
next_char:
|
|
c = *(from++);
|
|
if (!c)
|
|
break;
|
|
if (COMMAND_LINE_SIZE <= ++len)
|
|
break;
|
|
*(to++) = c;
|
|
}
|
|
*to = '\0';
|
|
*cmdline_p = command_line;
|
|
if (userdef) {
|
|
printk(KERN_INFO "user-defined physical RAM map:\n");
|
|
print_memory_map("user");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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, start, 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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Determine low and high memory ranges:
|
|
*/
|
|
unsigned long __init find_max_low_pfn(void)
|
|
{
|
|
unsigned long max_low_pfn;
|
|
|
|
max_low_pfn = max_pfn;
|
|
if (max_low_pfn > MAXMEM_PFN) {
|
|
if (highmem_pages == -1)
|
|
highmem_pages = max_pfn - MAXMEM_PFN;
|
|
if (highmem_pages + MAXMEM_PFN < max_pfn)
|
|
max_pfn = MAXMEM_PFN + highmem_pages;
|
|
if (highmem_pages + MAXMEM_PFN > max_pfn) {
|
|
printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
|
|
highmem_pages = 0;
|
|
}
|
|
max_low_pfn = MAXMEM_PFN;
|
|
#ifndef CONFIG_HIGHMEM
|
|
/* Maximum memory usable is what is directly addressable */
|
|
printk(KERN_WARNING "Warning only %ldMB will be used.\n",
|
|
MAXMEM>>20);
|
|
if (max_pfn > MAX_NONPAE_PFN)
|
|
printk(KERN_WARNING "Use a PAE enabled kernel.\n");
|
|
else
|
|
printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
|
|
max_pfn = MAXMEM_PFN;
|
|
#else /* !CONFIG_HIGHMEM */
|
|
#ifndef CONFIG_X86_PAE
|
|
if (max_pfn > MAX_NONPAE_PFN) {
|
|
max_pfn = MAX_NONPAE_PFN;
|
|
printk(KERN_WARNING "Warning only 4GB will be used.\n");
|
|
printk(KERN_WARNING "Use a PAE enabled kernel.\n");
|
|
}
|
|
#endif /* !CONFIG_X86_PAE */
|
|
#endif /* !CONFIG_HIGHMEM */
|
|
} else {
|
|
if (highmem_pages == -1)
|
|
highmem_pages = 0;
|
|
#ifdef CONFIG_HIGHMEM
|
|
if (highmem_pages >= max_pfn) {
|
|
printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
|
|
highmem_pages = 0;
|
|
}
|
|
if (highmem_pages) {
|
|
if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
|
|
printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
|
|
highmem_pages = 0;
|
|
}
|
|
max_low_pfn -= highmem_pages;
|
|
}
|
|
#else
|
|
if (highmem_pages)
|
|
printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
|
|
#endif
|
|
}
|
|
return max_low_pfn;
|
|
}
|
|
|
|
/*
|
|
* 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 + 1) << PAGE_SHIFT))
|
|
return 0;
|
|
if (end >= ((max_low_pfn + 1) << PAGE_SHIFT))
|
|
end = (max_low_pfn + 1) << PAGE_SHIFT;
|
|
if (start < end)
|
|
free_bootmem(start, end - start);
|
|
|
|
return 0;
|
|
}
|
|
/*
|
|
* Register fully available low RAM pages with the bootmem allocator.
|
|
*/
|
|
static 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));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* workaround for Dell systems that neglect to reserve EBDA
|
|
*/
|
|
static void __init reserve_ebda_region(void)
|
|
{
|
|
unsigned int addr;
|
|
addr = get_bios_ebda();
|
|
if (addr)
|
|
reserve_bootmem(addr, PAGE_SIZE);
|
|
}
|
|
|
|
#ifndef CONFIG_NEED_MULTIPLE_NODES
|
|
void __init setup_bootmem_allocator(void);
|
|
static unsigned long __init setup_memory(void)
|
|
{
|
|
/*
|
|
* partially used pages are not usable - thus
|
|
* we are rounding upwards:
|
|
*/
|
|
min_low_pfn = PFN_UP(init_pg_tables_end);
|
|
|
|
find_max_pfn();
|
|
|
|
max_low_pfn = find_max_low_pfn();
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
highstart_pfn = highend_pfn = max_pfn;
|
|
if (max_pfn > max_low_pfn) {
|
|
highstart_pfn = max_low_pfn;
|
|
}
|
|
printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
|
|
pages_to_mb(highend_pfn - highstart_pfn));
|
|
#endif
|
|
printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
|
|
pages_to_mb(max_low_pfn));
|
|
|
|
setup_bootmem_allocator();
|
|
|
|
return max_low_pfn;
|
|
}
|
|
|
|
void __init zone_sizes_init(void)
|
|
{
|
|
unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
|
|
unsigned int max_dma, low;
|
|
|
|
max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
|
|
low = max_low_pfn;
|
|
|
|
if (low < max_dma)
|
|
zones_size[ZONE_DMA] = low;
|
|
else {
|
|
zones_size[ZONE_DMA] = max_dma;
|
|
zones_size[ZONE_NORMAL] = low - max_dma;
|
|
#ifdef CONFIG_HIGHMEM
|
|
zones_size[ZONE_HIGHMEM] = highend_pfn - low;
|
|
#endif
|
|
}
|
|
free_area_init(zones_size);
|
|
}
|
|
#else
|
|
extern unsigned long __init setup_memory(void);
|
|
extern void zone_sizes_init(void);
|
|
#endif /* !CONFIG_NEED_MULTIPLE_NODES */
|
|
|
|
void __init setup_bootmem_allocator(void)
|
|
{
|
|
unsigned long bootmap_size;
|
|
/*
|
|
* Initialize the boot-time allocator (with low memory only):
|
|
*/
|
|
bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
|
|
|
|
register_bootmem_low_pages(max_low_pfn);
|
|
|
|
/*
|
|
* Reserve the bootmem bitmap itself as well. We do this in two
|
|
* steps (first step was init_bootmem()) because this catches
|
|
* the (very unlikely) case of us accidentally initializing the
|
|
* bootmem allocator with an invalid RAM area.
|
|
*/
|
|
reserve_bootmem(__PHYSICAL_START, (PFN_PHYS(min_low_pfn) +
|
|
bootmap_size + PAGE_SIZE-1) - (__PHYSICAL_START));
|
|
|
|
/*
|
|
* reserve physical page 0 - it's a special BIOS page on many boxes,
|
|
* enabling clean reboots, SMP operation, laptop functions.
|
|
*/
|
|
reserve_bootmem(0, PAGE_SIZE);
|
|
|
|
/* reserve EBDA region, it's a 4K region */
|
|
reserve_ebda_region();
|
|
|
|
/* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent
|
|
PCI prefetch into it (errata #56). Usually the page is reserved anyways,
|
|
unless you have no PS/2 mouse plugged in. */
|
|
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
|
|
boot_cpu_data.x86 == 6)
|
|
reserve_bootmem(0xa0000 - 4096, 4096);
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* But first pinch a few for the stack/trampoline stuff
|
|
* FIXME: Don't need the extra page at 4K, but need to fix
|
|
* trampoline before removing it. (see the GDT stuff)
|
|
*/
|
|
reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
|
|
#endif
|
|
#ifdef CONFIG_ACPI_SLEEP
|
|
/*
|
|
* Reserve low memory region for sleep support.
|
|
*/
|
|
acpi_reserve_bootmem();
|
|
#endif
|
|
#ifdef CONFIG_X86_FIND_SMP_CONFIG
|
|
/*
|
|
* Find and reserve possible boot-time SMP configuration:
|
|
*/
|
|
find_smp_config();
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (LOADER_TYPE && INITRD_START) {
|
|
if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
|
|
reserve_bootmem(INITRD_START, INITRD_SIZE);
|
|
initrd_start =
|
|
INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
|
|
initrd_end = initrd_start+INITRD_SIZE;
|
|
}
|
|
else {
|
|
printk(KERN_ERR "initrd extends beyond end of memory "
|
|
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
|
|
INITRD_START + INITRD_SIZE,
|
|
max_low_pfn << PAGE_SHIFT);
|
|
initrd_start = 0;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_KEXEC
|
|
if (crashk_res.start != crashk_res.end)
|
|
reserve_bootmem(crashk_res.start,
|
|
crashk_res.end - crashk_res.start + 1);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* The node 0 pgdat is initialized before all of these because
|
|
* it's needed for bootmem. node>0 pgdats have their virtual
|
|
* space allocated before the pagetables are in place to access
|
|
* them, so they can't be cleared then.
|
|
*
|
|
* This should all compile down to nothing when NUMA is off.
|
|
*/
|
|
void __init remapped_pgdat_init(void)
|
|
{
|
|
int nid;
|
|
|
|
for_each_online_node(nid) {
|
|
if (nid != 0)
|
|
memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Request address space for all standard RAM and ROM resources
|
|
* and also for regions reported as reserved by the e820.
|
|
*/
|
|
static void __init
|
|
legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource)
|
|
{
|
|
int i;
|
|
|
|
probe_roms();
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
struct resource *res;
|
|
if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
|
|
continue;
|
|
res = alloc_bootmem_low(sizeof(struct resource));
|
|
switch (e820.map[i].type) {
|
|
case E820_RAM: res->name = "System RAM"; break;
|
|
case E820_ACPI: res->name = "ACPI Tables"; break;
|
|
case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
|
|
default: res->name = "reserved";
|
|
}
|
|
res->start = e820.map[i].addr;
|
|
res->end = res->start + e820.map[i].size - 1;
|
|
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
|
request_resource(&iomem_resource, res);
|
|
if (e820.map[i].type == E820_RAM) {
|
|
/*
|
|
* We don't know which RAM region contains kernel data,
|
|
* so we try it repeatedly and let the resource manager
|
|
* test it.
|
|
*/
|
|
request_resource(res, code_resource);
|
|
request_resource(res, data_resource);
|
|
#ifdef CONFIG_KEXEC
|
|
request_resource(res, &crashk_res);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Request address space for all standard resources
|
|
*/
|
|
static void __init register_memory(void)
|
|
{
|
|
unsigned long gapstart, gapsize, round;
|
|
unsigned long long last;
|
|
int i;
|
|
|
|
if (efi_enabled)
|
|
efi_initialize_iomem_resources(&code_resource, &data_resource);
|
|
else
|
|
legacy_init_iomem_resources(&code_resource, &data_resource);
|
|
|
|
/* EFI systems may still have VGA */
|
|
request_resource(&iomem_resource, &video_ram_resource);
|
|
|
|
/* request I/O space for devices used on all i[345]86 PCs */
|
|
for (i = 0; i < STANDARD_IO_RESOURCES; i++)
|
|
request_resource(&ioport_resource, &standard_io_resources[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);
|
|
}
|
|
|
|
/* Use inline assembly to define this because the nops are defined
|
|
as inline assembly strings in the include files and we cannot
|
|
get them easily into strings. */
|
|
asm("\t.data\nintelnops: "
|
|
GENERIC_NOP1 GENERIC_NOP2 GENERIC_NOP3 GENERIC_NOP4 GENERIC_NOP5 GENERIC_NOP6
|
|
GENERIC_NOP7 GENERIC_NOP8);
|
|
asm("\t.data\nk8nops: "
|
|
K8_NOP1 K8_NOP2 K8_NOP3 K8_NOP4 K8_NOP5 K8_NOP6
|
|
K8_NOP7 K8_NOP8);
|
|
asm("\t.data\nk7nops: "
|
|
K7_NOP1 K7_NOP2 K7_NOP3 K7_NOP4 K7_NOP5 K7_NOP6
|
|
K7_NOP7 K7_NOP8);
|
|
|
|
extern unsigned char intelnops[], k8nops[], k7nops[];
|
|
static unsigned char *intel_nops[ASM_NOP_MAX+1] = {
|
|
NULL,
|
|
intelnops,
|
|
intelnops + 1,
|
|
intelnops + 1 + 2,
|
|
intelnops + 1 + 2 + 3,
|
|
intelnops + 1 + 2 + 3 + 4,
|
|
intelnops + 1 + 2 + 3 + 4 + 5,
|
|
intelnops + 1 + 2 + 3 + 4 + 5 + 6,
|
|
intelnops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
|
|
};
|
|
static unsigned char *k8_nops[ASM_NOP_MAX+1] = {
|
|
NULL,
|
|
k8nops,
|
|
k8nops + 1,
|
|
k8nops + 1 + 2,
|
|
k8nops + 1 + 2 + 3,
|
|
k8nops + 1 + 2 + 3 + 4,
|
|
k8nops + 1 + 2 + 3 + 4 + 5,
|
|
k8nops + 1 + 2 + 3 + 4 + 5 + 6,
|
|
k8nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
|
|
};
|
|
static unsigned char *k7_nops[ASM_NOP_MAX+1] = {
|
|
NULL,
|
|
k7nops,
|
|
k7nops + 1,
|
|
k7nops + 1 + 2,
|
|
k7nops + 1 + 2 + 3,
|
|
k7nops + 1 + 2 + 3 + 4,
|
|
k7nops + 1 + 2 + 3 + 4 + 5,
|
|
k7nops + 1 + 2 + 3 + 4 + 5 + 6,
|
|
k7nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
|
|
};
|
|
static struct nop {
|
|
int cpuid;
|
|
unsigned char **noptable;
|
|
} noptypes[] = {
|
|
{ X86_FEATURE_K8, k8_nops },
|
|
{ X86_FEATURE_K7, k7_nops },
|
|
{ -1, NULL }
|
|
};
|
|
|
|
/* Replace instructions with better alternatives for this CPU type.
|
|
|
|
This runs before SMP is initialized to avoid SMP problems with
|
|
self modifying code. This implies that assymetric systems where
|
|
APs have less capabilities than the boot processor are not handled.
|
|
Tough. Make sure you disable such features by hand. */
|
|
void apply_alternatives(void *start, void *end)
|
|
{
|
|
struct alt_instr *a;
|
|
int diff, i, k;
|
|
unsigned char **noptable = intel_nops;
|
|
for (i = 0; noptypes[i].cpuid >= 0; i++) {
|
|
if (boot_cpu_has(noptypes[i].cpuid)) {
|
|
noptable = noptypes[i].noptable;
|
|
break;
|
|
}
|
|
}
|
|
for (a = start; (void *)a < end; a++) {
|
|
if (!boot_cpu_has(a->cpuid))
|
|
continue;
|
|
BUG_ON(a->replacementlen > a->instrlen);
|
|
memcpy(a->instr, a->replacement, a->replacementlen);
|
|
diff = a->instrlen - a->replacementlen;
|
|
/* Pad the rest with nops */
|
|
for (i = a->replacementlen; diff > 0; diff -= k, i += k) {
|
|
k = diff;
|
|
if (k > ASM_NOP_MAX)
|
|
k = ASM_NOP_MAX;
|
|
memcpy(a->instr + i, noptable[k], k);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __init alternative_instructions(void)
|
|
{
|
|
extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
|
|
apply_alternatives(__alt_instructions, __alt_instructions_end);
|
|
}
|
|
|
|
static char * __init machine_specific_memory_setup(void);
|
|
|
|
#ifdef CONFIG_MCA
|
|
static void set_mca_bus(int x)
|
|
{
|
|
MCA_bus = x;
|
|
}
|
|
#else
|
|
static void set_mca_bus(int x) { }
|
|
#endif
|
|
|
|
/*
|
|
* Determine if we were loaded by an EFI loader. If so, then we have also been
|
|
* passed the efi memmap, systab, etc., so we should use these data structures
|
|
* for initialization. Note, the efi init code path is determined by the
|
|
* global efi_enabled. This allows the same kernel image to be used on existing
|
|
* systems (with a traditional BIOS) as well as on EFI systems.
|
|
*/
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
unsigned long max_low_pfn;
|
|
|
|
memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
|
|
pre_setup_arch_hook();
|
|
early_cpu_init();
|
|
|
|
/*
|
|
* FIXME: This isn't an official loader_type right
|
|
* now but does currently work with elilo.
|
|
* If we were configured as an EFI kernel, check to make
|
|
* sure that we were loaded correctly from elilo and that
|
|
* the system table is valid. If not, then initialize normally.
|
|
*/
|
|
#ifdef CONFIG_EFI
|
|
if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
|
|
efi_enabled = 1;
|
|
#endif
|
|
|
|
ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
|
|
drive_info = DRIVE_INFO;
|
|
screen_info = SCREEN_INFO;
|
|
edid_info = EDID_INFO;
|
|
apm_info.bios = APM_BIOS_INFO;
|
|
ist_info = IST_INFO;
|
|
saved_videomode = VIDEO_MODE;
|
|
if( SYS_DESC_TABLE.length != 0 ) {
|
|
set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
|
|
machine_id = SYS_DESC_TABLE.table[0];
|
|
machine_submodel_id = SYS_DESC_TABLE.table[1];
|
|
BIOS_revision = SYS_DESC_TABLE.table[2];
|
|
}
|
|
bootloader_type = LOADER_TYPE;
|
|
|
|
#ifdef CONFIG_BLK_DEV_RAM
|
|
rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
|
|
rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
|
|
rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
|
|
#endif
|
|
ARCH_SETUP
|
|
if (efi_enabled)
|
|
efi_init();
|
|
else {
|
|
printk(KERN_INFO "BIOS-provided physical RAM map:\n");
|
|
print_memory_map(machine_specific_memory_setup());
|
|
}
|
|
|
|
copy_edd();
|
|
|
|
if (!MOUNT_ROOT_RDONLY)
|
|
root_mountflags &= ~MS_RDONLY;
|
|
init_mm.start_code = (unsigned long) _text;
|
|
init_mm.end_code = (unsigned long) _etext;
|
|
init_mm.end_data = (unsigned long) _edata;
|
|
init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
|
|
|
|
code_resource.start = virt_to_phys(_text);
|
|
code_resource.end = virt_to_phys(_etext)-1;
|
|
data_resource.start = virt_to_phys(_etext);
|
|
data_resource.end = virt_to_phys(_edata)-1;
|
|
|
|
parse_cmdline_early(cmdline_p);
|
|
|
|
max_low_pfn = setup_memory();
|
|
|
|
/*
|
|
* NOTE: before this point _nobody_ is allowed to allocate
|
|
* any memory using the bootmem allocator. Although the
|
|
* alloctor is now initialised only the first 8Mb of the kernel
|
|
* virtual address space has been mapped. All allocations before
|
|
* paging_init() has completed must use the alloc_bootmem_low_pages()
|
|
* variant (which allocates DMA'able memory) and care must be taken
|
|
* not to exceed the 8Mb limit.
|
|
*/
|
|
|
|
#ifdef CONFIG_SMP
|
|
smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
|
|
#endif
|
|
paging_init();
|
|
remapped_pgdat_init();
|
|
sparse_init();
|
|
zone_sizes_init();
|
|
|
|
/*
|
|
* NOTE: at this point the bootmem allocator is fully available.
|
|
*/
|
|
|
|
#ifdef CONFIG_EARLY_PRINTK
|
|
{
|
|
char *s = strstr(*cmdline_p, "earlyprintk=");
|
|
if (s) {
|
|
extern void setup_early_printk(char *);
|
|
|
|
setup_early_printk(s);
|
|
printk("early console enabled\n");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
dmi_scan_machine();
|
|
|
|
#ifdef CONFIG_X86_GENERICARCH
|
|
generic_apic_probe(*cmdline_p);
|
|
#endif
|
|
if (efi_enabled)
|
|
efi_map_memmap();
|
|
|
|
#ifdef CONFIG_ACPI
|
|
/*
|
|
* Parse the ACPI tables for possible boot-time SMP configuration.
|
|
*/
|
|
acpi_boot_table_init();
|
|
acpi_boot_init();
|
|
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
|
|
if (def_to_bigsmp)
|
|
printk(KERN_WARNING "More than 8 CPUs detected and "
|
|
"CONFIG_X86_PC cannot handle it.\nUse "
|
|
"CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
|
|
#endif
|
|
#endif
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
if (smp_found_config)
|
|
get_smp_config();
|
|
#endif
|
|
|
|
register_memory();
|
|
|
|
#ifdef CONFIG_VT
|
|
#if defined(CONFIG_VGA_CONSOLE)
|
|
if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
|
|
conswitchp = &vga_con;
|
|
#elif defined(CONFIG_DUMMY_CONSOLE)
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
#include "setup_arch_post.h"
|
|
/*
|
|
* Local Variables:
|
|
* mode:c
|
|
* c-file-style:"k&r"
|
|
* c-basic-offset:8
|
|
* End:
|
|
*/
|