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