[deliverable/linux.git] / include / asm-generic / memory_model.h

#ifndef __ASM_MEMORY_MODEL_H
#define __ASM_MEMORY_MODEL_H

#include <linux/pfn.h>

#ifndef __ASSEMBLY__

#if defined(CONFIG_FLATMEM)

#ifndef ARCH_PFN_OFFSET
#define ARCH_PFN_OFFSET		(0UL)
#endif

#elif defined(CONFIG_DISCONTIGMEM)

#ifndef arch_pfn_to_nid
#define arch_pfn_to_nid(pfn)	pfn_to_nid(pfn)
#endif

#ifndef arch_local_page_offset
#define arch_local_page_offset(pfn, nid)	\
	((pfn) - NODE_DATA(nid)->node_start_pfn)
#endif

#endif /* CONFIG_DISCONTIGMEM */

/*
 * supports 3 memory models.
 */
#if defined(CONFIG_FLATMEM)

#define __pfn_to_page(pfn)	(mem_map + ((pfn) - ARCH_PFN_OFFSET))
#define __page_to_pfn(page)	((unsigned long)((page) - mem_map) + \
				 ARCH_PFN_OFFSET)
#elif defined(CONFIG_DISCONTIGMEM)

#define __pfn_to_page(pfn)			\
({	unsigned long __pfn = (pfn);		\
	unsigned long __nid = arch_pfn_to_nid(__pfn);  \
	NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
})

#define __page_to_pfn(pg)						\
({	const struct page *__pg = (pg);					\
	struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg));	\
	(unsigned long)(__pg - __pgdat->node_mem_map) +			\
	 __pgdat->node_start_pfn;					\
})

#elif defined(CONFIG_SPARSEMEM_VMEMMAP)

/* memmap is virtually contiguous.  */
#define __pfn_to_page(pfn)	(vmemmap + (pfn))
#define __page_to_pfn(page)	(unsigned long)((page) - vmemmap)

#elif defined(CONFIG_SPARSEMEM)
/*
 * Note: section's mem_map is encoded to reflect its start_pfn.
 * section[i].section_mem_map == mem_map's address - start_pfn;
 */
#define __page_to_pfn(pg)					\
({	const struct page *__pg = (pg);				\
	int __sec = page_to_section(__pg);			\
	(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec)));	\
})

#define __pfn_to_page(pfn)				\
({	unsigned long __pfn = (pfn);			\
	struct mem_section *__sec = __pfn_to_section(__pfn);	\
	__section_mem_map_addr(__sec) + __pfn;		\
})
#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */

/*
 * Convert a physical address to a Page Frame Number and back
 */
#define	__phys_to_pfn(paddr)	PHYS_PFN(paddr)
#define	__pfn_to_phys(pfn)	PFN_PHYS(pfn)

#define page_to_pfn __page_to_pfn
#define pfn_to_page __pfn_to_page

#endif /* __ASSEMBLY__ */

#endif
Commit	Line	Data
	1	#ifndef __ASM_MEMORY_MODEL_H
	2	#define __ASM_MEMORY_MODEL_H
	3
	4	#include <linux/pfn.h>
	5
	6	#ifndef __ASSEMBLY__
	7
	8	#if defined(CONFIG_FLATMEM)
	9
	10	#ifndef ARCH_PFN_OFFSET
	11	#define ARCH_PFN_OFFSET (0UL)
	12	#endif
	13
	14	#elif defined(CONFIG_DISCONTIGMEM)
	15
	16	#ifndef arch_pfn_to_nid
	17	#define arch_pfn_to_nid(pfn) pfn_to_nid(pfn)
	18	#endif
	19
	20	#ifndef arch_local_page_offset
	21	#define arch_local_page_offset(pfn, nid) \
	22	((pfn) - NODE_DATA(nid)->node_start_pfn)
	23	#endif
	24
	25	#endif /* CONFIG_DISCONTIGMEM */
	26
	27	/*
	28	* supports 3 memory models.
	29	*/
	30	#if defined(CONFIG_FLATMEM)
	31
	32	#define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET))
	33	#define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \
	34	ARCH_PFN_OFFSET)
	35	#elif defined(CONFIG_DISCONTIGMEM)
	36
	37	#define __pfn_to_page(pfn) \
	38	({ unsigned long __pfn = (pfn); \
	39	unsigned long __nid = arch_pfn_to_nid(__pfn); \
	40	NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
	41	})
	42
	43	#define __page_to_pfn(pg) \
	44	({ const struct page *__pg = (pg); \
	45	struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \
	46	(unsigned long)(__pg - __pgdat->node_mem_map) + \
	47	__pgdat->node_start_pfn; \
	48	})
	49
	50	#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
	51
	52	/* memmap is virtually contiguous. */
	53	#define __pfn_to_page(pfn) (vmemmap + (pfn))
	54	#define __page_to_pfn(page) (unsigned long)((page) - vmemmap)
	55
	56	#elif defined(CONFIG_SPARSEMEM)
	57	/*
	58	* Note: section's mem_map is encoded to reflect its start_pfn.
	59	* section[i].section_mem_map == mem_map's address - start_pfn;
	60	*/
	61	#define __page_to_pfn(pg) \
	62	({ const struct page *__pg = (pg); \
	63	int __sec = page_to_section(__pg); \
	64	(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \
	65	})
	66
	67	#define __pfn_to_page(pfn) \
	68	({ unsigned long __pfn = (pfn); \
	69	struct mem_section *__sec = __pfn_to_section(__pfn); \
	70	__section_mem_map_addr(__sec) + __pfn; \
	71	})
	72	#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
	73
	74	/*
	75	* Convert a physical address to a Page Frame Number and back
	76	*/
	77	#define __phys_to_pfn(paddr) PHYS_PFN(paddr)
	78	#define __pfn_to_phys(pfn) PFN_PHYS(pfn)
	79
	80	#define page_to_pfn __page_to_pfn
	81	#define pfn_to_page __pfn_to_page
	82
	83	#endif /* __ASSEMBLY__ */
	84
	85	#endif