forked from Minki/linux
b40827fa72
This patch adds an initial page table with low mappings used exclusively for booting APs/resuming after ACPI suspend/machine restart. After this, there's no need to add low mappings to swapper_pg_dir and zap them later or create own swsusp PGD page solely for ACPI sleep needs - we have initial_page_table for that. Signed-off-by: Borislav Petkov <bp@alien8.de> LKML-Reference: <20101020070526.GA9588@liondog.tnic> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
/*
|
|
* linux/arch/i386/kernel/head32.c -- prepare to run common code
|
|
*
|
|
* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
|
|
* Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/start_kernel.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/e820.h>
|
|
#include <asm/page.h>
|
|
#include <asm/trampoline.h>
|
|
#include <asm/apic.h>
|
|
#include <asm/io_apic.h>
|
|
#include <asm/bios_ebda.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
static void __init i386_default_early_setup(void)
|
|
{
|
|
/* Initialize 32bit specific setup functions */
|
|
x86_init.resources.probe_roms = probe_roms;
|
|
x86_init.resources.reserve_resources = i386_reserve_resources;
|
|
x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
|
|
|
|
reserve_ebda_region();
|
|
}
|
|
|
|
void __init i386_start_kernel(void)
|
|
{
|
|
#ifdef CONFIG_X86_TRAMPOLINE
|
|
/*
|
|
* 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_early_overlap_ok(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE,
|
|
"EX TRAMPOLINE");
|
|
#endif
|
|
|
|
reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/* Reserve INITRD */
|
|
if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
|
|
/* Assume only end is not page aligned */
|
|
u64 ramdisk_image = boot_params.hdr.ramdisk_image;
|
|
u64 ramdisk_size = boot_params.hdr.ramdisk_size;
|
|
u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
|
|
reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
|
|
}
|
|
#endif
|
|
|
|
/* Call the subarch specific early setup function */
|
|
switch (boot_params.hdr.hardware_subarch) {
|
|
case X86_SUBARCH_MRST:
|
|
x86_mrst_early_setup();
|
|
break;
|
|
default:
|
|
i386_default_early_setup();
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* At this point everything still needed from the boot loader
|
|
* or BIOS or kernel text should be early reserved or marked not
|
|
* RAM in e820. All other memory is free game.
|
|
*/
|
|
|
|
start_kernel();
|
|
}
|