diff options
| author | Borislav Petkov <bp@alien8.de> | 2010-08-28 15:58:33 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-10-20 14:23:55 -0700 |
| commit | b40827fa7268fda8a62490728a61c2856f33830b (patch) | |
| tree | ae16ce8206c3d72ca672a92a46dc0725faba1ced /arch/x86/mm/init_32.c | |
| parent | d25e6b0b326278a1096e8334584c3e64517057a3 (diff) | |
| download | linux-b40827fa7268fda8a62490728a61c2856f33830b.tar.bz2 | |
x86-32, mm: Add an initial page table for core bootstrapping
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>
Diffstat (limited to 'arch/x86/mm/init_32.c')
| -rw-r--r-- | arch/x86/mm/init_32.c | 45 |
1 files changed, 0 insertions, 45 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 558f2d332076..1aeac2d9df80 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -548,48 +548,6 @@ static void __init pagetable_init(void) permanent_kmaps_init(pgd_base); } -#ifdef CONFIG_ACPI_SLEEP -/* - * ACPI suspend needs this for resume, because things like the intel-agp - * driver might have split up a kernel 4MB mapping. - */ -char swsusp_pg_dir[PAGE_SIZE] - __attribute__ ((aligned(PAGE_SIZE))); - -static inline void save_pg_dir(void) -{ - copy_page(swsusp_pg_dir, swapper_pg_dir); -} -#else /* !CONFIG_ACPI_SLEEP */ -static inline void save_pg_dir(void) -{ -} -#endif /* !CONFIG_ACPI_SLEEP */ - -void zap_low_mappings(bool early) -{ - int i; - - /* - * Zap initial low-memory mappings. - * - * Note that "pgd_clear()" doesn't do it for - * us, because pgd_clear() is a no-op on i386. - */ - for (i = 0; i < KERNEL_PGD_BOUNDARY; i++) { -#ifdef CONFIG_X86_PAE - set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page))); -#else - set_pgd(swapper_pg_dir+i, __pgd(0)); -#endif - } - - if (early) - __flush_tlb(); - else - flush_tlb_all(); -} - pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP); EXPORT_SYMBOL_GPL(__supported_pte_mask); @@ -958,9 +916,6 @@ void __init mem_init(void) if (boot_cpu_data.wp_works_ok < 0) test_wp_bit(); - - save_pg_dir(); - zap_low_mappings(true); } #ifdef CONFIG_MEMORY_HOTPLUG |