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x86-32, mm: Add an initial page table for core bootstrapping

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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>
This commit is contained in:
Borislav Petkov
2010-08-28 15:58:33 +02:00
committed by H. Peter Anvin
parent d25e6b0b32
commit b40827fa72
11 changed files with 58 additions and 121 deletions
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7
arch/x86/kernel/acpi/sleep.c
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@@ -12,6 +12,11 @@
#include <asm/segment.h>
#include <asm/desc.h>
#ifdef CONFIG_X86_32
#include <asm/pgtable.h>
#include <asm/pgtable_32.h>
#endif
#include "realmode/wakeup.h"
#include "sleep.h"
@@ -90,7 +95,7 @@ int acpi_save_state_mem(void)
#ifndef CONFIG_64BIT
header->pmode_entry = (u32)&wakeup_pmode_return;
header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
header->pmode_cr3 = (u32)__pa(&initial_page_table);
saved_magic = 0x12345678;
#else /* CONFIG_64BIT */
header->trampoline_segment = setup_trampoline() >> 4;