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

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