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x86-32: compute initial mapping size more accurately

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Impact: simplification

We only need to map the kernel in head_32.S, not the whole of
lowmem.  We use 512MB as a reasonable (but arbitrary) limit on
the maximum size of the kernel image.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Yinghai Lu 2009-03-12 16:04:42 -07:00 committed by H. Peter Anvin
parent 6de6cb442e
commit 7543c1de84
2 changed files with 6 additions and 1 deletions
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5
arch/x86/include/asm/page_32_types.h
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@ -39,6 +39,11 @@
#define __VIRTUAL_MASK_SHIFT 32 #define __VIRTUAL_MASK_SHIFT 32
#endif /* CONFIG_X86_PAE */ #endif /* CONFIG_X86_PAE */
/*
* Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S)
*/
#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
/* /*

2
arch/x86/kernel/head_32.S
View File

@ -54,7 +54,7 @@
* *
* This should be a multiple of a page. * This should be a multiple of a page.
*/ */
LOW_PAGES = 1<<(32-PAGE_SHIFT_asm) LOW_PAGES = (KERNEL_IMAGE_SIZE + PAGE_SIZE_asm - 1)>>PAGE_SHIFT
/* /*
* To preserve the DMA pool in PAGEALLOC kernels, we'll allocate * To preserve the DMA pool in PAGEALLOC kernels, we'll allocate