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
14#ifdef __KERNEL__
15
16/* PAGE_SHIFT determines the page size */
17#define PAGE_SHIFT		12
18#define PAGE_SIZE		(1UL << PAGE_SHIFT)
19#define PAGE_MASK		(~(PAGE_SIZE-1))
20
21/* to align the pointer to the (next) page boundary */
22#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
23
24#ifndef __ASSEMBLY__
25
26#ifndef CONFIG_MMU
27
28#include "page-nommu.h"
29
30#else
31
32#include <asm/glue.h>
33
34/*
35 *	User Space Model
36 *	================
37 *
38 *	This section selects the correct set of functions for dealing with
39 *	page-based copying and clearing for user space for the particular
40 *	processor(s) we're building for.
41 *
42 *	We have the following to choose from:
43 *	  v3		- ARMv3
44 *	  v4wt		- ARMv4 with writethrough cache, without minicache
45 *	  v4wb		- ARMv4 with writeback cache, without minicache
46 *	  v4_mc		- ARMv4 with minicache
47 *	  xscale	- Xscale
48 *	  xsc3		- XScalev3
49 */
50#undef _USER
51#undef MULTI_USER
52
53#ifdef CONFIG_CPU_COPY_V3
54# ifdef _USER
55#  define MULTI_USER 1
56# else
57#  define _USER v3
58# endif
59#endif
60
61#ifdef CONFIG_CPU_COPY_V4WT
62# ifdef _USER
63#  define MULTI_USER 1
64# else
65#  define _USER v4wt
66# endif
67#endif
68
69#ifdef CONFIG_CPU_COPY_V4WB
70# ifdef _USER
71#  define MULTI_USER 1
72# else
73#  define _USER v4wb
74# endif
75#endif
76
77#ifdef CONFIG_CPU_SA1100
78# ifdef _USER
79#  define MULTI_USER 1
80# else
81#  define _USER v4_mc
82# endif
83#endif
84
85#ifdef CONFIG_CPU_XSCALE
86# ifdef _USER
87#  define MULTI_USER 1
88# else
89#  define _USER xscale_mc
90# endif
91#endif
92
93#ifdef CONFIG_CPU_XSC3
94# ifdef _USER
95#  define MULTI_USER 1
96# else
97#  define _USER xsc3_mc
98# endif
99#endif
100
101#ifdef CONFIG_CPU_COPY_V6
102# define MULTI_USER 1
103#endif
104
105#if !defined(_USER) && !defined(MULTI_USER)
106#error Unknown user operations model
107#endif
108
109struct cpu_user_fns {
110	void (*cpu_clear_user_page)(void *p, unsigned long user);
111	void (*cpu_copy_user_page)(void *to, const void *from,
112				   unsigned long user);
113};
114
115#ifdef MULTI_USER
116extern struct cpu_user_fns cpu_user;
117
118#define __cpu_clear_user_page	cpu_user.cpu_clear_user_page
119#define __cpu_copy_user_page	cpu_user.cpu_copy_user_page
120
121#else
122
123#define __cpu_clear_user_page	__glue(_USER,_clear_user_page)
124#define __cpu_copy_user_page	__glue(_USER,_copy_user_page)
125
126extern void __cpu_clear_user_page(void *p, unsigned long user);
127extern void __cpu_copy_user_page(void *to, const void *from,
128				 unsigned long user);
129#endif
130
131#define clear_user_page(addr,vaddr,pg)	 __cpu_clear_user_page(addr, vaddr)
132#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
133
134#define clear_page(page)	memzero((void *)(page), PAGE_SIZE)
135extern void copy_page(void *to, const void *from);
136
137#undef STRICT_MM_TYPECHECKS
138
139#ifdef STRICT_MM_TYPECHECKS
140/*
141 * These are used to make use of C type-checking..
142 */
143typedef struct { unsigned long pte; } pte_t;
144typedef struct { unsigned long pmd; } pmd_t;
145typedef struct { unsigned long pgd[2]; } pgd_t;
146typedef struct { unsigned long pgprot; } pgprot_t;
147
148#define pte_val(x)      ((x).pte)
149#define pmd_val(x)      ((x).pmd)
150#define pgd_val(x)	((x).pgd[0])
151#define pgprot_val(x)   ((x).pgprot)
152
153#define __pte(x)        ((pte_t) { (x) } )
154#define __pmd(x)        ((pmd_t) { (x) } )
155#define __pgprot(x)     ((pgprot_t) { (x) } )
156
157#else
158/*
159 * .. while these make it easier on the compiler
160 */
161typedef unsigned long pte_t;
162typedef unsigned long pmd_t;
163typedef unsigned long pgd_t[2];
164typedef unsigned long pgprot_t;
165
166#define pte_val(x)      (x)
167#define pmd_val(x)      (x)
168#define pgd_val(x)	((x)[0])
169#define pgprot_val(x)   (x)
170
171#define __pte(x)        (x)
172#define __pmd(x)        (x)
173#define __pgprot(x)     (x)
174
175#endif /* STRICT_MM_TYPECHECKS */
176
177#endif /* CONFIG_MMU */
178
179#include <asm/memory.h>
180
181#endif /* !__ASSEMBLY__ */
182
183#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
184				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
185
186/*
187 * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
188 */
189#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
190#define ARCH_SLAB_MINALIGN 8
191#endif
192
193#include <asm-generic/page.h>
194
195#endif /* __KERNEL__ */
196
197#endif
198