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