bb8985586b
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
35 lines
895 B
C
35 lines
895 B
C
#ifndef ASM_X86__SPARSEMEM_H
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#define ASM_X86__SPARSEMEM_H
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#ifdef CONFIG_SPARSEMEM
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/*
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* generic non-linear memory support:
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*
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* 1) we will not split memory into more chunks than will fit into the flags
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* field of the struct page
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*
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* SECTION_SIZE_BITS 2^n: size of each section
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* MAX_PHYSADDR_BITS 2^n: max size of physical address space
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* MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space
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*
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*/
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#ifdef CONFIG_X86_32
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# ifdef CONFIG_X86_PAE
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# define SECTION_SIZE_BITS 29
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# define MAX_PHYSADDR_BITS 36
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# define MAX_PHYSMEM_BITS 36
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# else
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# define SECTION_SIZE_BITS 26
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# define MAX_PHYSADDR_BITS 32
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# define MAX_PHYSMEM_BITS 32
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# endif
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#else /* CONFIG_X86_32 */
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# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */
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# define MAX_PHYSADDR_BITS 44
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# define MAX_PHYSMEM_BITS 44
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#endif
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#endif /* CONFIG_SPARSEMEM */
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#endif /* ASM_X86__SPARSEMEM_H */
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