1#ifndef _ASM_X86_SPARSEMEM_H 2#define _ASM_X86_SPARSEMEM_H 3 4#ifdef CONFIG_SPARSEMEM 5/* 6 * generic non-linear memory support: 7 * 8 * 1) we will not split memory into more chunks than will fit into the flags 9 * field of the struct page 10 * 11 * SECTION_SIZE_BITS 2^n: size of each section 12 * MAX_PHYSADDR_BITS 2^n: max size of physical address space 13 * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space 14 * 15 */ 16 17#ifdef CONFIG_X86_32 18# ifdef CONFIG_X86_PAE 19# define SECTION_SIZE_BITS 29 20# define MAX_PHYSADDR_BITS 36 21# define MAX_PHYSMEM_BITS 36 22# else 23# define SECTION_SIZE_BITS 26 24# define MAX_PHYSADDR_BITS 32 25# define MAX_PHYSMEM_BITS 32 26# endif 27#else /* CONFIG_X86_32 */ 28# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ 29# define MAX_PHYSADDR_BITS 44 30# define MAX_PHYSMEM_BITS 44 31#endif 32 33#endif /* CONFIG_SPARSEMEM */ 34#endif 35