tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
fork
Configure Feed
Select the types of activity you want to include in your feed.
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/*
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
35#ifndef __ASSEMBLY__
36
37#include <linux/pfn.h>
38#include <asm/io.h>
39
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
47extern 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);
66 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
67 flush_data_cache_page((unsigned long)addr);
68}
69
70extern 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);
75
76#define __HAVE_ARCH_COPY_USER_HIGHPAGE
77
78/*
79 * These are used to make use of C type-checking..
80 */
81#ifdef CONFIG_64BIT_PHYS_ADDR
82 #ifdef CONFIG_CPU_MIPS32
83 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))
85 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
86 #else
87 typedef struct { unsigned long long pte; } pte_t;
88 #define pte_val(x) ((x).pte)
89 #define __pte(x) ((pte_t) { (x) } )
90 #endif
91#else
92typedef struct { unsigned long pte; } pte_t;
93#define pte_val(x) ((x).pte)
94#define __pte(x) ((pte_t) { (x) } )
95#endif
96
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
102
103typedef struct { unsigned long pmd; } pmd_t;
104#define pmd_val(x) ((x).pmd)
105#define __pmd(x) ((pmd_t) { (x) } )
106
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)
119#define __pgd(x) ((pgd_t) { (x) } )
120
121/*
122 * Manipulate page protection bits
123 */
124typedef struct { unsigned long pgprot; } pgprot_t;
125#define pgprot_val(x) ((x).pgprot)
126#define __pgprot(x) ((pgprot_t) { (x) } )
127
128/*
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
137#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
142/*
143 * __pa()/__va() should be used only during mem init.
144 */
145#ifdef CONFIG_64BIT
146#define __pa(x) \
147({ \
148 unsigned long __x = (unsigned long)(x); \
149 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \
150})
151#else
152#define __pa(x) \
153 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
154#endif
155#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
156#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
157
158#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
159
160#ifdef CONFIG_FLATMEM
161
162#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
163
164#elif defined(CONFIG_SPARSEMEM)
165
166/* pfn_valid is defined in linux/mmzone.h */
167
168#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
179#endif
180
181#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)))
183
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
190#include <asm-generic/memory_model.h>
191#include <asm-generic/page.h>
192
193#endif /* defined (__KERNEL__) */
194
195#endif /* _ASM_PAGE_H */