1#ifndef _I386_SPARSEMEM_H 2#define _I386_SPARSEMEM_H 3#ifdef CONFIG_SPARSEMEM 4 5/* 6 * generic non-linear memory support: 7 * 8 * 1) we will not split memory into more chunks than will fit into the 9 * flags field of the struct page 10 */ 11 12/* 13 * SECTION_SIZE_BITS 2^N: how big each section will be 14 * MAX_PHYSADDR_BITS 2^N: how much physical address space we have 15 * MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space 16 */ 17#ifdef CONFIG_X86_PAE 18#define SECTION_SIZE_BITS 30 19#define MAX_PHYSADDR_BITS 36 20#define MAX_PHYSMEM_BITS 36 21#else 22#define SECTION_SIZE_BITS 26 23#define MAX_PHYSADDR_BITS 32 24#define MAX_PHYSMEM_BITS 32 25#endif 26 27#define kern_addr_valid(kaddr) (0) 28 29#endif /* CONFIG_SPARSEMEM */ 30#endif /* _I386_SPARSEMEM_H */ 31