From bb8985586b7a906e116db835c64773b7a7d51663 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 17 Aug 2008 21:05:42 -0400 Subject: x86, um: ... and asm-x86 move Signed-off-by: Al Viro Signed-off-by: H. Peter Anvin --- arch/x86/include/asm/sparsemem.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 arch/x86/include/asm/sparsemem.h (limited to 'arch/x86/include/asm/sparsemem.h') diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h new file mode 100644 index 00000000000..38f8e6bc318 --- /dev/null +++ b/arch/x86/include/asm/sparsemem.h @@ -0,0 +1,34 @@ +#ifndef ASM_X86__SPARSEMEM_H +#define ASM_X86__SPARSEMEM_H + +#ifdef CONFIG_SPARSEMEM +/* + * generic non-linear memory support: + * + * 1) we will not split memory into more chunks than will fit into the flags + * field of the struct page + * + * SECTION_SIZE_BITS 2^n: size of each section + * MAX_PHYSADDR_BITS 2^n: max size of physical address space + * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space + * + */ + +#ifdef CONFIG_X86_32 +# ifdef CONFIG_X86_PAE +# define SECTION_SIZE_BITS 29 +# define MAX_PHYSADDR_BITS 36 +# define MAX_PHYSMEM_BITS 36 +# else +# define SECTION_SIZE_BITS 26 +# define MAX_PHYSADDR_BITS 32 +# define MAX_PHYSMEM_BITS 32 +# endif +#else /* CONFIG_X86_32 */ +# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ +# define MAX_PHYSADDR_BITS 44 +# define MAX_PHYSMEM_BITS 44 +#endif + +#endif /* CONFIG_SPARSEMEM */ +#endif /* ASM_X86__SPARSEMEM_H */ -- cgit v1.2.3-70-g09d2