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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/* 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/* to align the pointer to the (next) page boundary */
19#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
20
21#ifndef __ASSEMBLY__
22
23#ifndef CONFIG_MMU
24
25#include "page-nommu.h"
26
27#else
28
29#include <asm/glue.h>
30
31/*
32 * User Space Model
33 * ================
34 *
35 * This section selects the correct set of functions for dealing with
36 * page-based copying and clearing for user space for the particular
37 * processor(s) we're building for.
38 *
39 * We have the following to choose from:
40 * v3 - ARMv3
41 * v4wt - ARMv4 with writethrough cache, without minicache
42 * v4wb - ARMv4 with writeback cache, without minicache
43 * v4_mc - ARMv4 with minicache
44 * xscale - Xscale
45 * xsc3 - XScalev3
46 */
47#undef _USER
48#undef MULTI_USER
49
50#ifdef CONFIG_CPU_COPY_V3
51# ifdef _USER
52# define MULTI_USER 1
53# else
54# define _USER v3
55# endif
56#endif
57
58#ifdef CONFIG_CPU_COPY_V4WT
59# ifdef _USER
60# define MULTI_USER 1
61# else
62# define _USER v4wt
63# endif
64#endif
65
66#ifdef CONFIG_CPU_COPY_V4WB
67# ifdef _USER
68# define MULTI_USER 1
69# else
70# define _USER v4wb
71# endif
72#endif
73
74#ifdef CONFIG_CPU_COPY_FEROCEON
75# ifdef _USER
76# define MULTI_USER 1
77# else
78# define _USER feroceon
79# endif
80#endif
81
82#ifdef CONFIG_CPU_SA1100
83# ifdef _USER
84# define MULTI_USER 1
85# else
86# define _USER v4_mc
87# endif
88#endif
89
90#ifdef CONFIG_CPU_XSCALE
91# ifdef _USER
92# define MULTI_USER 1
93# else
94# define _USER xscale_mc
95# endif
96#endif
97
98#ifdef CONFIG_CPU_XSC3
99# ifdef _USER
100# define MULTI_USER 1
101# else
102# define _USER xsc3_mc
103# endif
104#endif
105
106#ifdef CONFIG_CPU_COPY_V6
107# define MULTI_USER 1
108#endif
109
110#if !defined(_USER) && !defined(MULTI_USER)
111#error Unknown user operations model
112#endif
113
114struct cpu_user_fns {
115 void (*cpu_clear_user_page)(void *p, unsigned long user);
116 void (*cpu_copy_user_page)(void *to, const void *from,
117 unsigned long user);
118};
119
120#ifdef MULTI_USER
121extern struct cpu_user_fns cpu_user;
122
123#define __cpu_clear_user_page cpu_user.cpu_clear_user_page
124#define __cpu_copy_user_page cpu_user.cpu_copy_user_page
125
126#else
127
128#define __cpu_clear_user_page __glue(_USER,_clear_user_page)
129#define __cpu_copy_user_page __glue(_USER,_copy_user_page)
130
131extern void __cpu_clear_user_page(void *p, unsigned long user);
132extern void __cpu_copy_user_page(void *to, const void *from,
133 unsigned long user);
134#endif
135
136#define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr)
137#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
138
139#define clear_page(page) memzero((void *)(page), PAGE_SIZE)
140extern void copy_page(void *to, const void *from);
141
142#undef STRICT_MM_TYPECHECKS
143
144#ifdef STRICT_MM_TYPECHECKS
145/*
146 * These are used to make use of C type-checking..
147 */
148typedef struct { unsigned long pte; } pte_t;
149typedef struct { unsigned long pmd; } pmd_t;
150typedef struct { unsigned long pgd[2]; } pgd_t;
151typedef struct { unsigned long pgprot; } pgprot_t;
152
153#define pte_val(x) ((x).pte)
154#define pmd_val(x) ((x).pmd)
155#define pgd_val(x) ((x).pgd[0])
156#define pgprot_val(x) ((x).pgprot)
157
158#define __pte(x) ((pte_t) { (x) } )
159#define __pmd(x) ((pmd_t) { (x) } )
160#define __pgprot(x) ((pgprot_t) { (x) } )
161
162#else
163/*
164 * .. while these make it easier on the compiler
165 */
166typedef unsigned long pte_t;
167typedef unsigned long pmd_t;
168typedef unsigned long pgd_t[2];
169typedef unsigned long pgprot_t;
170
171#define pte_val(x) (x)
172#define pmd_val(x) (x)
173#define pgd_val(x) ((x)[0])
174#define pgprot_val(x) (x)
175
176#define __pte(x) (x)
177#define __pmd(x) (x)
178#define __pgprot(x) (x)
179
180#endif /* STRICT_MM_TYPECHECKS */
181
182#endif /* CONFIG_MMU */
183
184typedef struct page *pgtable_t;
185
186#include <asm/memory.h>
187
188#endif /* !__ASSEMBLY__ */
189
190#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
191 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
192
193/*
194 * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
195 */
196#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
197#define ARCH_SLAB_MINALIGN 8
198#endif
199
200#include <asm-generic/page.h>
201
202#endif