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Linux kernel mirror (for testing)
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linux
1/*
2 * arch/arm/include/asm/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/* PAGE_SHIFT determines the page size */
14#define PAGE_SHIFT 12
15#define PAGE_SIZE (1UL << PAGE_SHIFT)
16#define PAGE_MASK (~(PAGE_SIZE-1))
17
18#ifndef __ASSEMBLY__
19
20#ifndef CONFIG_MMU
21
22#include "page-nommu.h"
23
24#else
25
26#include <asm/glue.h>
27
28/*
29 * User Space Model
30 * ================
31 *
32 * This section selects the correct set of functions for dealing with
33 * page-based copying and clearing for user space for the particular
34 * processor(s) we're building for.
35 *
36 * We have the following to choose from:
37 * v3 - ARMv3
38 * v4wt - ARMv4 with writethrough cache, without minicache
39 * v4wb - ARMv4 with writeback cache, without minicache
40 * v4_mc - ARMv4 with minicache
41 * xscale - Xscale
42 * xsc3 - XScalev3
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_COPY_FEROCEON
72# ifdef _USER
73# define MULTI_USER 1
74# else
75# define _USER feroceon
76# endif
77#endif
78
79#ifdef CONFIG_CPU_SA1100
80# ifdef _USER
81# define MULTI_USER 1
82# else
83# define _USER v4_mc
84# endif
85#endif
86
87#ifdef CONFIG_CPU_XSCALE
88# ifdef _USER
89# define MULTI_USER 1
90# else
91# define _USER xscale_mc
92# endif
93#endif
94
95#ifdef CONFIG_CPU_XSC3
96# ifdef _USER
97# define MULTI_USER 1
98# else
99# define _USER xsc3_mc
100# endif
101#endif
102
103#ifdef CONFIG_CPU_COPY_V6
104# define MULTI_USER 1
105#endif
106
107#if !defined(_USER) && !defined(MULTI_USER)
108#error Unknown user operations model
109#endif
110
111struct page;
112
113struct cpu_user_fns {
114 void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
115 void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
116 unsigned long vaddr);
117};
118
119#ifdef MULTI_USER
120extern struct cpu_user_fns cpu_user;
121
122#define __cpu_clear_user_highpage cpu_user.cpu_clear_user_highpage
123#define __cpu_copy_user_highpage cpu_user.cpu_copy_user_highpage
124
125#else
126
127#define __cpu_clear_user_highpage __glue(_USER,_clear_user_highpage)
128#define __cpu_copy_user_highpage __glue(_USER,_copy_user_highpage)
129
130extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
131extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
132 unsigned long vaddr);
133#endif
134
135#define clear_user_highpage(page,vaddr) \
136 __cpu_clear_user_highpage(page, vaddr)
137
138#define __HAVE_ARCH_COPY_USER_HIGHPAGE
139#define copy_user_highpage(to,from,vaddr,vma) \
140 __cpu_copy_user_highpage(to, from, vaddr)
141
142#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
143extern void copy_page(void *to, const void *from);
144
145#undef STRICT_MM_TYPECHECKS
146
147#ifdef STRICT_MM_TYPECHECKS
148/*
149 * These are used to make use of C type-checking..
150 */
151typedef struct { unsigned long pte; } pte_t;
152typedef struct { unsigned long pmd; } pmd_t;
153typedef struct { unsigned long pgd[2]; } pgd_t;
154typedef struct { unsigned long pgprot; } pgprot_t;
155
156#define pte_val(x) ((x).pte)
157#define pmd_val(x) ((x).pmd)
158#define pgd_val(x) ((x).pgd[0])
159#define pgprot_val(x) ((x).pgprot)
160
161#define __pte(x) ((pte_t) { (x) } )
162#define __pmd(x) ((pmd_t) { (x) } )
163#define __pgprot(x) ((pgprot_t) { (x) } )
164
165#else
166/*
167 * .. while these make it easier on the compiler
168 */
169typedef unsigned long pte_t;
170typedef unsigned long pmd_t;
171typedef unsigned long pgd_t[2];
172typedef unsigned long pgprot_t;
173
174#define pte_val(x) (x)
175#define pmd_val(x) (x)
176#define pgd_val(x) ((x)[0])
177#define pgprot_val(x) (x)
178
179#define __pte(x) (x)
180#define __pmd(x) (x)
181#define __pgprot(x) (x)
182
183#endif /* STRICT_MM_TYPECHECKS */
184
185#endif /* CONFIG_MMU */
186
187typedef struct page *pgtable_t;
188
189#include <asm/memory.h>
190
191#endif /* !__ASSEMBLY__ */
192
193#define VM_DATA_DEFAULT_FLAGS \
194 (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
195 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
196
197/*
198 * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
199 */
200#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
201#define ARCH_SLAB_MINALIGN 8
202#endif
203
204#include <asm-generic/page.h>
205
206#endif