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a117e66ed4
There are 3 memory models, FLATMEM, DISCONTIGMEM, SPARSEMEM. Each arch has its own page_to_pfn(), pfn_to_page() for each models. But most of them can use the same arithmetic. This patch adds asm-generic/memory_model.h, which includes generic page_to_pfn(), pfn_to_page() definitions for each memory model. When CONFIG_OUT_OF_LINE_PFN_TO_PAGE=y, out-of-line functions are used instead of macro. This is enabled by some archs and reduces text size. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: Andi Kleen <ak@muc.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Hirokazu Takata <takata.hirokazu@renesas.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Chris Zankel <chris@zankel.net> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
#ifndef __ASM_MEMORY_MODEL_H
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#define __ASM_MEMORY_MODEL_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_FLATMEM)
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#ifndef ARCH_PFN_OFFSET
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#define ARCH_PFN_OFFSET (0UL)
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#endif
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#elif defined(CONFIG_DISCONTIGMEM)
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#ifndef arch_pfn_to_nid
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#define arch_pfn_to_nid(pfn) pfn_to_nid(pfn)
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#endif
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#ifndef arch_local_page_offset
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#define arch_local_page_offset(pfn, nid) \
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((pfn) - NODE_DATA(nid)->node_start_pfn)
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#endif
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#endif /* CONFIG_DISCONTIGMEM */
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#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
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struct page;
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/* this is useful when inlined pfn_to_page is too big */
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extern struct page *pfn_to_page(unsigned long pfn);
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extern unsigned long page_to_pfn(struct page *page);
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#else
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/*
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* supports 3 memory models.
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*/
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#if defined(CONFIG_FLATMEM)
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#define pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET))
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#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + \
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ARCH_PFN_OFFSET)
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#elif defined(CONFIG_DISCONTIGMEM)
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#define pfn_to_page(pfn) \
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({ unsigned long __pfn = (pfn); \
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unsigned long __nid = arch_pfn_to_nid(pfn); \
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NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
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})
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#define page_to_pfn(pg) \
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({ struct page *__pg = (pg); \
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struct zone *__zone = page_zone(__pg); \
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(unsigned long)(__pg - __zone->zone_mem_map) + \
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__zone->zone_start_pfn; \
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})
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#elif defined(CONFIG_SPARSEMEM)
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/*
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* Note: section's mem_map is encorded to reflect its start_pfn.
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* section[i].section_mem_map == mem_map's address - start_pfn;
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*/
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#define page_to_pfn(pg) \
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({ struct page *__pg = (pg); \
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int __sec = page_to_section(__pg); \
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__pg - __section_mem_map_addr(__nr_to_section(__sec)); \
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})
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#define pfn_to_page(pfn) \
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({ unsigned long __pfn = (pfn); \
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struct mem_section *__sec = __pfn_to_section(__pfn); \
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__section_mem_map_addr(__sec) + __pfn; \
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})
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#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
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#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif
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