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Commit 7543c1de authored Mar 12, 2009 by Yinghai Lu Committed by H. Peter Anvin Mar 14, 2009

x86-32: compute initial mapping size more accurately



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>

parent 6de6cb44

arch/x86/include/asm/page_32_types.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -39,6 +39,11 @@
		#define __VIRTUAL_MASK_SHIFT 32
		#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__

		/*

arch/x86/kernel/head_32.S

+1 −1

Original line number	Diff line number	Diff line
		@@ -54,7 +54,7 @@
		*
		* 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