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Linux kernel mirror (for testing)
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linux
1/*
2 * linux/include/asm-arm/page.h
3 *
4 * Copyright (C) 1995-2003 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#ifndef _ASMARM_PAGE_H
11#define _ASMARM_PAGE_H
12
13#include <linux/config.h>
14
15/* PAGE_SHIFT determines the page size */
16#define PAGE_SHIFT 12
17#define PAGE_SIZE (1UL << PAGE_SHIFT)
18#define PAGE_MASK (~(PAGE_SIZE-1))
19
20#ifdef __KERNEL__
21
22/* to align the pointer to the (next) page boundary */
23#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
24
25#ifndef __ASSEMBLY__
26
27#include <asm/glue.h>
28
29/*
30 * User Space Model
31 * ================
32 *
33 * This section selects the correct set of functions for dealing with
34 * page-based copying and clearing for user space for the particular
35 * processor(s) we're building for.
36 *
37 * We have the following to choose from:
38 * v3 - ARMv3
39 * v4wt - ARMv4 with writethrough cache, without minicache
40 * v4wb - ARMv4 with writeback cache, without minicache
41 * v4_mc - ARMv4 with minicache
42 * xscale - Xscale
43 */
44#undef _USER
45#undef MULTI_USER
46
47#ifdef CONFIG_CPU_COPY_V3
48# ifdef _USER
49# define MULTI_USER 1
50# else
51# define _USER v3
52# endif
53#endif
54
55#ifdef CONFIG_CPU_COPY_V4WT
56# ifdef _USER
57# define MULTI_USER 1
58# else
59# define _USER v4wt
60# endif
61#endif
62
63#ifdef CONFIG_CPU_COPY_V4WB
64# ifdef _USER
65# define MULTI_USER 1
66# else
67# define _USER v4wb
68# endif
69#endif
70
71#ifdef CONFIG_CPU_SA1100
72# ifdef _USER
73# define MULTI_USER 1
74# else
75# define _USER v4_mc
76# endif
77#endif
78
79#ifdef CONFIG_CPU_XSCALE
80# ifdef _USER
81# define MULTI_USER 1
82# else
83# define _USER xscale_mc
84# endif
85#endif
86
87#ifdef CONFIG_CPU_COPY_V6
88# define MULTI_USER 1
89#endif
90
91#if !defined(_USER) && !defined(MULTI_USER)
92#error Unknown user operations model
93#endif
94
95struct cpu_user_fns {
96 void (*cpu_clear_user_page)(void *p, unsigned long user);
97 void (*cpu_copy_user_page)(void *to, const void *from,
98 unsigned long user);
99};
100
101#ifdef MULTI_USER
102extern struct cpu_user_fns cpu_user;
103
104#define __cpu_clear_user_page cpu_user.cpu_clear_user_page
105#define __cpu_copy_user_page cpu_user.cpu_copy_user_page
106
107#else
108
109#define __cpu_clear_user_page __glue(_USER,_clear_user_page)
110#define __cpu_copy_user_page __glue(_USER,_copy_user_page)
111
112extern void __cpu_clear_user_page(void *p, unsigned long user);
113extern void __cpu_copy_user_page(void *to, const void *from,
114 unsigned long user);
115#endif
116
117#define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr)
118#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
119
120#define clear_page(page) memzero((void *)(page), PAGE_SIZE)
121extern void copy_page(void *to, const void *from);
122
123#undef STRICT_MM_TYPECHECKS
124
125#ifdef STRICT_MM_TYPECHECKS
126/*
127 * These are used to make use of C type-checking..
128 */
129typedef struct { unsigned long pte; } pte_t;
130typedef struct { unsigned long pmd; } pmd_t;
131typedef struct { unsigned long pgd[2]; } pgd_t;
132typedef struct { unsigned long pgprot; } pgprot_t;
133
134#define pte_val(x) ((x).pte)
135#define pmd_val(x) ((x).pmd)
136#define pgd_val(x) ((x).pgd[0])
137#define pgprot_val(x) ((x).pgprot)
138
139#define __pte(x) ((pte_t) { (x) } )
140#define __pmd(x) ((pmd_t) { (x) } )
141#define __pgprot(x) ((pgprot_t) { (x) } )
142
143#else
144/*
145 * .. while these make it easier on the compiler
146 */
147typedef unsigned long pte_t;
148typedef unsigned long pmd_t;
149typedef unsigned long pgd_t[2];
150typedef unsigned long pgprot_t;
151
152#define pte_val(x) (x)
153#define pmd_val(x) (x)
154#define pgd_val(x) ((x)[0])
155#define pgprot_val(x) (x)
156
157#define __pte(x) (x)
158#define __pmd(x) (x)
159#define __pgprot(x) (x)
160
161#endif /* STRICT_MM_TYPECHECKS */
162
163/* the upper-most page table pointer */
164extern pmd_t *top_pmd;
165
166#include <asm/memory.h>
167
168#endif /* !__ASSEMBLY__ */
169
170#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
171 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
172
173#endif /* __KERNEL__ */
174
175#include <asm-generic/page.h>
176
177#endif