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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2006-03-27 04:15:25 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 11:44:44 -0500
commita117e66ed45ac0569c039ea60bd7a9a61e031858 (patch)
tree292367ab930f83c418c34d4c46f95717e5e6394e /include/asm-generic/memory_model.h
parentb06be912a3ad68c69dba0ed6e92723140020e392 (diff)
[PATCH] unify pfn_to_page: generic functions
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>
Diffstat (limited to 'include/asm-generic/memory_model.h')
-rw-r--r--include/asm-generic/memory_model.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h
new file mode 100644
index 000000000000..a7bb4978e808
--- /dev/null
+++ b/include/asm-generic/memory_model.h
@@ -0,0 +1,77 @@
1#ifndef __ASM_MEMORY_MODEL_H
2#define __ASM_MEMORY_MODEL_H
3
4#ifdef __KERNEL__
5#ifndef __ASSEMBLY__
6
7#if defined(CONFIG_FLATMEM)
8
9#ifndef ARCH_PFN_OFFSET
10#define ARCH_PFN_OFFSET (0UL)
11#endif
12
13#elif defined(CONFIG_DISCONTIGMEM)
14
15#ifndef arch_pfn_to_nid
16#define arch_pfn_to_nid(pfn) pfn_to_nid(pfn)
17#endif
18
19#ifndef arch_local_page_offset
20#define arch_local_page_offset(pfn, nid) \
21 ((pfn) - NODE_DATA(nid)->node_start_pfn)
22#endif
23
24#endif /* CONFIG_DISCONTIGMEM */
25
26#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
27struct page;
28/* this is useful when inlined pfn_to_page is too big */
29extern struct page *pfn_to_page(unsigned long pfn);
30extern unsigned long page_to_pfn(struct page *page);
31#else
32/*
33 * supports 3 memory models.
34 */
35#if defined(CONFIG_FLATMEM)
36
37#define pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET))
38#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + \
39 ARCH_PFN_OFFSET)
40#elif defined(CONFIG_DISCONTIGMEM)
41
42#define pfn_to_page(pfn) \
43({ unsigned long __pfn = (pfn); \
44 unsigned long __nid = arch_pfn_to_nid(pfn); \
45 NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
46})
47
48#define page_to_pfn(pg) \
49({ struct page *__pg = (pg); \
50 struct zone *__zone = page_zone(__pg); \
51 (unsigned long)(__pg - __zone->zone_mem_map) + \
52 __zone->zone_start_pfn; \
53})
54
55#elif defined(CONFIG_SPARSEMEM)
56/*
57 * Note: section's mem_map is encorded to reflect its start_pfn.
58 * section[i].section_mem_map == mem_map's address - start_pfn;
59 */
60#define page_to_pfn(pg) \
61({ struct page *__pg = (pg); \
62 int __sec = page_to_section(__pg); \
63 __pg - __section_mem_map_addr(__nr_to_section(__sec)); \
64})
65
66#define pfn_to_page(pfn) \
67({ unsigned long __pfn = (pfn); \
68 struct mem_section *__sec = __pfn_to_section(__pfn); \
69 __section_mem_map_addr(__sec) + __pfn; \
70})
71#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
72#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
73
74#endif /* __ASSEMBLY__ */
75#endif /* __KERNEL__ */
76
77#endif