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-rw-r--r--arch/x86/kernel/head_32.S16
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index bcece91dd311..c0dbd9ac24f0 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -60,16 +60,18 @@
60#define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD) 60#define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD)
61#endif 61#endif
62 62
63/* Number of possible pages in the lowmem region */
64LOWMEM_PAGES = (((1<<32) - __PAGE_OFFSET) >> PAGE_SHIFT)
65
63/* Enough space to fit pagetables for the low memory linear map */ 66/* Enough space to fit pagetables for the low memory linear map */
64MAPPING_BEYOND_END = \ 67MAPPING_BEYOND_END = PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT
65 PAGE_TABLE_SIZE(((1<<32) - __PAGE_OFFSET) >> PAGE_SHIFT) << PAGE_SHIFT
66 68
67/* 69/*
68 * Worst-case size of the kernel mapping we need to make: 70 * Worst-case size of the kernel mapping we need to make:
69 * the worst-case size of the kernel itself, plus the extra we need 71 * a relocatable kernel can live anywhere in lowmem, so we need to be able
70 * to map for the linear map. 72 * to map all of lowmem.
71 */ 73 */
72KERNEL_PAGES = (KERNEL_IMAGE_SIZE + MAPPING_BEYOND_END)>>PAGE_SHIFT 74KERNEL_PAGES = LOWMEM_PAGES
73 75
74INIT_MAP_SIZE = PAGE_TABLE_SIZE(KERNEL_PAGES) * PAGE_SIZE_asm 76INIT_MAP_SIZE = PAGE_TABLE_SIZE(KERNEL_PAGES) * PAGE_SIZE_asm
75RESERVE_BRK(pagetables, INIT_MAP_SIZE) 77RESERVE_BRK(pagetables, INIT_MAP_SIZE)
@@ -620,13 +622,13 @@ ENTRY(initial_code)
620__PAGE_ALIGNED_BSS 622__PAGE_ALIGNED_BSS
621 .align PAGE_SIZE_asm 623 .align PAGE_SIZE_asm
622#ifdef CONFIG_X86_PAE 624#ifdef CONFIG_X86_PAE
623initial_pg_pmd: 625ENTRY(initial_pg_pmd)
624 .fill 1024*KPMDS,4,0 626 .fill 1024*KPMDS,4,0
625#else 627#else
626ENTRY(initial_page_table) 628ENTRY(initial_page_table)
627 .fill 1024,4,0 629 .fill 1024,4,0
628#endif 630#endif
629initial_pg_fixmap: 631ENTRY(initial_pg_fixmap)
630 .fill 1024,4,0 632 .fill 1024,4,0
631ENTRY(empty_zero_page) 633ENTRY(empty_zero_page)
632 .fill 4096,1,0 634 .fill 4096,1,0