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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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arch/x86/include/asm/trampoline.h
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@@ -13,16 +13,13 @@ extern unsigned char *trampoline_base;
extern unsigned long init_rsp;
extern unsigned long initial_code;
extern unsigned long initial_page_table;
extern unsigned long initial_gs;
#define TRAMPOLINE_SIZE roundup(trampoline_end - trampoline_data, PAGE_SIZE)
extern unsigned long setup_trampoline(void);
extern void __init setup_trampoline_page_table(void);
extern void __init reserve_trampoline_memory(void);
#else
static inline void setup_trampoline_page_table(void) {}
static inline void reserve_trampoline_memory(void) {}
#endif /* CONFIG_X86_TRAMPOLINE */