mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-01-09 14:43:16 +00:00
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
|
#ifndef __ASM_MEMORY_MODEL_H
|
||
|
|
#define __ASM_MEMORY_MODEL_H
|
||
|
|
|
||
|
|
#ifdef __KERNEL__
|
||
|
|
#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 */
|
||
|
|
|
||
|
|
#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
|
||
|
|
struct page;
|
||
|
|
/* this is useful when inlined pfn_to_page is too big */
|
||
|
|
extern struct page *pfn_to_page(unsigned long pfn);
|
||
|
|
extern unsigned long page_to_pfn(struct page *page);
|
||
|
|
#else
|
||
|
|
/*
|
||
|
|
* 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) \
|
||
|
|
({ struct page *__pg = (pg); \
|
||
|
|
struct zone *__zone = page_zone(__pg); \
|
||
|
|
(unsigned long)(__pg - __zone->zone_mem_map) + \
|
||
|
|
__zone->zone_start_pfn; \
|
||
|
|
})
|
||
|
|
|
||
|
|
#elif defined(CONFIG_SPARSEMEM)
|
||
|
|
/*
|
||
|
|
* Note: section's mem_map is encorded to reflect its start_pfn.
|
||
|
|
* section[i].section_mem_map == mem_map's address - start_pfn;
|
||
|
|
*/
|
||
|
|
#define page_to_pfn(pg) \
|
||
|
|
({ struct page *__pg = (pg); \
|
||
|
|
int __sec = page_to_section(__pg); \
|
||
|
|
__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 */
|
||
|
|
#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
|
||
|
|
|
||
|
|
#endif /* __ASSEMBLY__ */
|
||
|
|
#endif /* __KERNEL__ */
|
||
|
|
|
||
|
|
#endif
|