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1/*
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
12
13#ifdef __KERNEL__
14
15#include <spaces.h>
16
17#endif
18
19/*
20 * PAGE_SHIFT determines the page size
21 */
22#ifdef CONFIG_PAGE_SIZE_4KB
23#define PAGE_SHIFT 12
24#endif
25#ifdef CONFIG_PAGE_SIZE_8KB
26#define PAGE_SHIFT 13
27#endif
28#ifdef CONFIG_PAGE_SIZE_16KB
29#define PAGE_SHIFT 14
30#endif
31#ifdef CONFIG_PAGE_SIZE_64KB
32#define PAGE_SHIFT 16
33#endif
34#define PAGE_SIZE (1UL << PAGE_SHIFT)
35#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
36
37
38#ifdef __KERNEL__
39#ifndef __ASSEMBLY__
40
41extern void clear_page(void * page);
42extern void copy_page(void * to, void * from);
43
44extern unsigned long shm_align_mask;
45
46static inline unsigned long pages_do_alias(unsigned long addr1,
47 unsigned long addr2)
48{
49 return (addr1 ^ addr2) & shm_align_mask;
50}
51
52struct page;
53
54static inline void clear_user_page(void *addr, unsigned long vaddr,
55 struct page *page)
56{
57 extern void (*flush_data_cache_page)(unsigned long addr);
58
59 clear_page(addr);
60 if (pages_do_alias((unsigned long) addr, vaddr))
61 flush_data_cache_page((unsigned long)addr);
62}
63
64static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
65 struct page *to)
66{
67 extern void (*flush_data_cache_page)(unsigned long addr);
68
69 copy_page(vto, vfrom);
70 if (pages_do_alias((unsigned long)vto, vaddr))
71 flush_data_cache_page((unsigned long)vto);
72}
73
74/*
75 * These are used to make use of C type-checking..
76 */
77#ifdef CONFIG_64BIT_PHYS_ADDR
78 #ifdef CONFIG_CPU_MIPS32
79 typedef struct { unsigned long pte_low, pte_high; } pte_t;
80 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
81 #else
82 typedef struct { unsigned long long pte; } pte_t;
83 #define pte_val(x) ((x).pte)
84 #endif
85#else
86typedef struct { unsigned long pte; } pte_t;
87#define pte_val(x) ((x).pte)
88#endif
89#define __pte(x) ((pte_t) { (x) } )
90
91/*
92 * For 3-level pagetables we defines these ourselves, for 2-level the
93 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
94 */
95#ifdef CONFIG_64BIT
96
97typedef struct { unsigned long pmd; } pmd_t;
98#define pmd_val(x) ((x).pmd)
99#define __pmd(x) ((pmd_t) { (x) } )
100
101#endif
102
103/*
104 * Right now we don't support 4-level pagetables, so all pud-related
105 * definitions come from <asm-generic/pgtable-nopud.h>.
106 */
107
108/*
109 * Finall the top of the hierarchy, the pgd
110 */
111typedef struct { unsigned long pgd; } pgd_t;
112#define pgd_val(x) ((x).pgd)
113#define __pgd(x) ((pgd_t) { (x) } )
114
115/*
116 * Manipulate page protection bits
117 */
118typedef struct { unsigned long pgprot; } pgprot_t;
119#define pgprot_val(x) ((x).pgprot)
120#define __pgprot(x) ((pgprot_t) { (x) } )
121
122/*
123 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
124 * pair of pages we only have a single global bit per pair of pages. When
125 * writing to the TLB make sure we always have the bit set for both pages
126 * or none. This macro is used to access the `buddy' of the pte we're just
127 * working on.
128 */
129#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
130
131#endif /* !__ASSEMBLY__ */
132
133/* to align the pointer to the (next) page boundary */
134#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
135
136#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
137#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
138
139#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
140
141#ifdef CONFIG_FLATMEM
142
143#define pfn_valid(pfn) ((pfn) < max_mapnr)
144
145#elif defined(CONFIG_SPARSEMEM)
146
147/* pfn_valid is defined in linux/mmzone.h */
148
149#elif defined(CONFIG_NEED_MULTIPLE_NODES)
150
151#define pfn_valid(pfn) \
152({ \
153 unsigned long __pfn = (pfn); \
154 int __n = pfn_to_nid(__pfn); \
155 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
156 NODE_DATA(__n)->node_spanned_pages) \
157 : 0); \
158})
159
160#endif
161
162#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
163#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
164
165#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
166 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
167
168#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
169#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
170
171#endif /* defined (__KERNEL__) */
172
173#ifdef CONFIG_LIMITED_DMA
174#define WANT_PAGE_VIRTUAL
175#endif
176
177#include <asm-generic/memory_model.h>
178#include <asm-generic/page.h>
179
180#endif /* _ASM_PAGE_H */