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Linux kernel mirror (for testing)
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kernel
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linux
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#include <spaces.h>
13#include <linux/const.h>
14
15/*
16 * PAGE_SHIFT determines the page size
17 */
18#ifdef CONFIG_PAGE_SIZE_4KB
19#define PAGE_SHIFT 12
20#endif
21#ifdef CONFIG_PAGE_SIZE_8KB
22#define PAGE_SHIFT 13
23#endif
24#ifdef CONFIG_PAGE_SIZE_16KB
25#define PAGE_SHIFT 14
26#endif
27#ifdef CONFIG_PAGE_SIZE_32KB
28#define PAGE_SHIFT 15
29#endif
30#ifdef CONFIG_PAGE_SIZE_64KB
31#define PAGE_SHIFT 16
32#endif
33#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
34#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
35
36#ifdef CONFIG_HUGETLB_PAGE
37#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
38#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
39#define HPAGE_MASK (~(HPAGE_SIZE - 1))
40#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
41#endif /* CONFIG_HUGETLB_PAGE */
42
43#ifndef __ASSEMBLY__
44
45#include <linux/pfn.h>
46#include <asm/io.h>
47
48extern void build_clear_page(void);
49extern void build_copy_page(void);
50
51/*
52 * It's normally defined only for FLATMEM config but it's
53 * used in our early mem init code for all memory models.
54 * So always define it.
55 */
56#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
57
58extern void clear_page(void * page);
59extern void copy_page(void * to, void * from);
60
61extern unsigned long shm_align_mask;
62
63static inline unsigned long pages_do_alias(unsigned long addr1,
64 unsigned long addr2)
65{
66 return (addr1 ^ addr2) & shm_align_mask;
67}
68
69struct page;
70
71static inline void clear_user_page(void *addr, unsigned long vaddr,
72 struct page *page)
73{
74 extern void (*flush_data_cache_page)(unsigned long addr);
75
76 clear_page(addr);
77 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
78 flush_data_cache_page((unsigned long)addr);
79}
80
81extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
82 struct page *to);
83struct vm_area_struct;
84extern void copy_user_highpage(struct page *to, struct page *from,
85 unsigned long vaddr, struct vm_area_struct *vma);
86
87#define __HAVE_ARCH_COPY_USER_HIGHPAGE
88
89/*
90 * These are used to make use of C type-checking..
91 */
92#ifdef CONFIG_64BIT_PHYS_ADDR
93 #ifdef CONFIG_CPU_MIPS32
94 typedef struct { unsigned long pte_low, pte_high; } pte_t;
95 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
96 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
97 #else
98 typedef struct { unsigned long long pte; } pte_t;
99 #define pte_val(x) ((x).pte)
100 #define __pte(x) ((pte_t) { (x) } )
101 #endif
102#else
103typedef struct { unsigned long pte; } pte_t;
104#define pte_val(x) ((x).pte)
105#define __pte(x) ((pte_t) { (x) } )
106#endif
107typedef struct page *pgtable_t;
108
109/*
110 * For 3-level pagetables we defines these ourselves, for 2-level the
111 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
112 */
113#ifdef CONFIG_64BIT
114
115typedef struct { unsigned long pmd; } pmd_t;
116#define pmd_val(x) ((x).pmd)
117#define __pmd(x) ((pmd_t) { (x) } )
118
119#endif
120
121/*
122 * Right now we don't support 4-level pagetables, so all pud-related
123 * definitions come from <asm-generic/pgtable-nopud.h>.
124 */
125
126/*
127 * Finall the top of the hierarchy, the pgd
128 */
129typedef struct { unsigned long pgd; } pgd_t;
130#define pgd_val(x) ((x).pgd)
131#define __pgd(x) ((pgd_t) { (x) } )
132
133/*
134 * Manipulate page protection bits
135 */
136typedef struct { unsigned long pgprot; } pgprot_t;
137#define pgprot_val(x) ((x).pgprot)
138#define __pgprot(x) ((pgprot_t) { (x) } )
139
140/*
141 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
142 * pair of pages we only have a single global bit per pair of pages. When
143 * writing to the TLB make sure we always have the bit set for both pages
144 * or none. This macro is used to access the `buddy' of the pte we're just
145 * working on.
146 */
147#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
148
149#endif /* !__ASSEMBLY__ */
150
151/*
152 * __pa()/__va() should be used only during mem init.
153 */
154#ifdef CONFIG_64BIT
155#define __pa(x) \
156({ \
157 unsigned long __x = (unsigned long)(x); \
158 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \
159})
160#else
161#define __pa(x) \
162 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
163#endif
164#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
165#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
166
167#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
168
169#ifdef CONFIG_FLATMEM
170
171#define pfn_valid(pfn) \
172({ \
173 unsigned long __pfn = (pfn); \
174 /* avoid <linux/bootmem.h> include hell */ \
175 extern unsigned long min_low_pfn; \
176 \
177 __pfn >= min_low_pfn && __pfn < max_mapnr; \
178})
179
180#elif defined(CONFIG_SPARSEMEM)
181
182/* pfn_valid is defined in linux/mmzone.h */
183
184#elif defined(CONFIG_NEED_MULTIPLE_NODES)
185
186#define pfn_valid(pfn) \
187({ \
188 unsigned long __pfn = (pfn); \
189 int __n = pfn_to_nid(__pfn); \
190 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
191 NODE_DATA(__n)->node_spanned_pages) \
192 : 0); \
193})
194
195#endif
196
197#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
198#define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
199
200#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
201 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
202
203#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
204#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
205
206#include <asm-generic/memory_model.h>
207#include <asm-generic/getorder.h>
208
209#endif /* _ASM_PAGE_H */