blob: d2ea983bec06f913645a26383b2793feb64d1d64 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PAGE_H
10#define _ASM_PAGE_H
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
13#ifdef __KERNEL__
14
15#include <spaces.h>
16
Linus Torvalds1da177e2005-04-16 15:20:36 -070017/*
18 * PAGE_SHIFT determines the page size
19 */
20#ifdef CONFIG_PAGE_SIZE_4KB
21#define PAGE_SHIFT 12
22#endif
23#ifdef CONFIG_PAGE_SIZE_8KB
24#define PAGE_SHIFT 13
25#endif
26#ifdef CONFIG_PAGE_SIZE_16KB
27#define PAGE_SHIFT 14
28#endif
29#ifdef CONFIG_PAGE_SIZE_64KB
30#define PAGE_SHIFT 16
31#endif
32#define PAGE_SIZE (1UL << PAGE_SHIFT)
33#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#ifndef __ASSEMBLY__
36
Franck Bui-Huu41b04832007-06-04 17:46:34 +020037#include <linux/pfn.h>
Franck Bui-Huub1c65b32007-06-04 17:46:35 +020038#include <asm/io.h>
Franck Bui-Huu6f284a22007-01-10 09:44:05 +010039
40/*
41 * It's normally defined only for FLATMEM config but it's
42 * used in our early mem init code for all memory models.
43 * So always define it.
44 */
45#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047extern void clear_page(void * page);
48extern void copy_page(void * to, void * from);
49
50extern unsigned long shm_align_mask;
51
52static inline unsigned long pages_do_alias(unsigned long addr1,
53 unsigned long addr2)
54{
55 return (addr1 ^ addr2) & shm_align_mask;
56}
57
58struct page;
59
60static inline void clear_user_page(void *addr, unsigned long vaddr,
61 struct page *page)
62{
63 extern void (*flush_data_cache_page)(unsigned long addr);
64
65 clear_page(addr);
Ralf Baechle585fa722006-08-12 16:40:08 +010066 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 flush_data_cache_page((unsigned long)addr);
68}
69
Atsushi Nemotobcd02282006-12-12 17:14:56 +000070extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
71 struct page *to);
72struct vm_area_struct;
73extern void copy_user_highpage(struct page *to, struct page *from,
74 unsigned long vaddr, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Atsushi Nemotobcd02282006-12-12 17:14:56 +000076#define __HAVE_ARCH_COPY_USER_HIGHPAGE
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78/*
79 * These are used to make use of C type-checking..
80 */
81#ifdef CONFIG_64BIT_PHYS_ADDR
Ralf Baechleec917c2c2005-10-07 16:58:15 +010082 #ifdef CONFIG_CPU_MIPS32
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 typedef struct { unsigned long pte_low, pte_high; } pte_t;
84 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
Ralf Baechled34555f2006-08-31 19:39:09 +010085 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 #else
87 typedef struct { unsigned long long pte; } pte_t;
88 #define pte_val(x) ((x).pte)
Ralf Baechled34555f2006-08-31 19:39:09 +010089 #define __pte(x) ((pte_t) { (x) } )
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 #endif
91#else
92typedef struct { unsigned long pte; } pte_t;
93#define pte_val(x) ((x).pte)
Ralf Baechlec6e8b582005-02-10 12:19:59 +000094#define __pte(x) ((pte_t) { (x) } )
Ralf Baechled34555f2006-08-31 19:39:09 +010095#endif
Ralf Baechlec6e8b582005-02-10 12:19:59 +000096
97/*
98 * For 3-level pagetables we defines these ourselves, for 2-level the
99 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
100 */
101#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103typedef struct { unsigned long pmd; } pmd_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104#define pmd_val(x) ((x).pmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105#define __pmd(x) ((pmd_t) { (x) } )
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000106
107#endif
108
109/*
110 * Right now we don't support 4-level pagetables, so all pud-related
111 * definitions come from <asm-generic/pgtable-nopud.h>.
112 */
113
114/*
115 * Finall the top of the hierarchy, the pgd
116 */
117typedef struct { unsigned long pgd; } pgd_t;
118#define pgd_val(x) ((x).pgd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#define __pgd(x) ((pgd_t) { (x) } )
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000120
121/*
122 * Manipulate page protection bits
123 */
124typedef struct { unsigned long pgprot; } pgprot_t;
125#define pgprot_val(x) ((x).pgprot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#define __pgprot(x) ((pgprot_t) { (x) } )
127
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000128/*
129 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
130 * pair of pages we only have a single global bit per pair of pages. When
131 * writing to the TLB make sure we always have the bit set for both pages
132 * or none. This macro is used to access the `buddy' of the pte we're just
133 * working on.
134 */
135#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137#endif /* !__ASSEMBLY__ */
138
139/* to align the pointer to the (next) page boundary */
140#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
141
Franck Bui-Huu6f284a22007-01-10 09:44:05 +0100142/*
143 * __pa()/__va() should be used only during mem init.
144 */
Ralf Baechlef4fae822007-10-11 23:46:12 +0100145#ifdef CONFIG_64BIT
Franck Bui-Huub1c65b32007-06-04 17:46:35 +0200146#define __pa(x) \
147({ \
148 unsigned long __x = (unsigned long)(x); \
149 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \
150})
Franck Bui-Huu620a4802006-10-19 13:20:00 +0200151#else
Franck Bui-Huub1c65b32007-06-04 17:46:35 +0200152#define __pa(x) \
153 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
Franck Bui-Huu620a4802006-10-19 13:20:00 +0200154#endif
Franck Bui-Huu6f284a22007-01-10 09:44:05 +0100155#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
Ralf Baechle21a151d2007-10-11 23:46:15 +0100156#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
158#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
159
Ralf Baechlee53639d2006-06-12 09:13:56 +0100160#ifdef CONFIG_FLATMEM
161
Franck Bui-Huu6f284a22007-01-10 09:44:05 +0100162#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
Ralf Baechlee53639d2006-06-12 09:13:56 +0100163
Atsushi Nemoto7de58fa2006-07-05 01:22:44 +0900164#elif defined(CONFIG_SPARSEMEM)
165
166/* pfn_valid is defined in linux/mmzone.h */
167
Ralf Baechlee53639d2006-06-12 09:13:56 +0100168#elif defined(CONFIG_NEED_MULTIPLE_NODES)
169
170#define pfn_valid(pfn) \
171({ \
172 unsigned long __pfn = (pfn); \
173 int __n = pfn_to_nid(__pfn); \
174 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
175 NODE_DATA(__n)->node_spanned_pages) \
176 : 0); \
177})
178
Ralf Baechlee53639d2006-06-12 09:13:56 +0100179#endif
180
Franck Bui-Huu99e3b942006-10-19 13:19:59 +0200181#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
182#define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
185 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
186
187#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
188#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
189
KAMEZAWA Hiroyukia02036e2006-03-27 01:15:43 -0800190#include <asm-generic/memory_model.h>
Stephen Rothwellfd4fd5a2005-09-03 15:54:30 -0700191#include <asm-generic/page.h>
192
David Woodhousea2aa3e22006-09-12 20:36:06 -0700193#endif /* defined (__KERNEL__) */
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195#endif /* _ASM_PAGE_H */