xref: /openbmc/linux/arch/arm/include/asm/page.h (revision 7a010c3c)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  *  arch/arm/include/asm/page.h
4  *
5  *  Copyright (C) 1995-2003 Russell King
6  */
7 #ifndef _ASMARM_PAGE_H
8 #define _ASMARM_PAGE_H
9 
10 /* PAGE_SHIFT determines the page size */
11 #define PAGE_SHIFT		12
12 #define PAGE_SIZE		(_AC(1,UL) << PAGE_SHIFT)
13 #define PAGE_MASK		(~((1 << PAGE_SHIFT) - 1))
14 
15 #ifndef __ASSEMBLY__
16 
17 #ifndef CONFIG_MMU
18 
19 #include <asm/page-nommu.h>
20 
21 #else
22 
23 #include <asm/glue.h>
24 
25 /*
26  *	User Space Model
27  *	================
28  *
29  *	This section selects the correct set of functions for dealing with
30  *	page-based copying and clearing for user space for the particular
31  *	processor(s) we're building for.
32  *
33  *	We have the following to choose from:
34  *	  v4wt		- ARMv4 with writethrough cache, without minicache
35  *	  v4wb		- ARMv4 with writeback cache, without minicache
36  *	  v4_mc		- ARMv4 with minicache
37  *	  xscale	- Xscale
38  *	  xsc3		- XScalev3
39  */
40 #undef _USER
41 #undef MULTI_USER
42 
43 #ifdef CONFIG_CPU_COPY_V4WT
44 # ifdef _USER
45 #  define MULTI_USER 1
46 # else
47 #  define _USER v4wt
48 # endif
49 #endif
50 
51 #ifdef CONFIG_CPU_COPY_V4WB
52 # ifdef _USER
53 #  define MULTI_USER 1
54 # else
55 #  define _USER v4wb
56 # endif
57 #endif
58 
59 #ifdef CONFIG_CPU_COPY_FEROCEON
60 # ifdef _USER
61 #  define MULTI_USER 1
62 # else
63 #  define _USER feroceon
64 # endif
65 #endif
66 
67 #ifdef CONFIG_CPU_COPY_FA
68 # ifdef _USER
69 #  define MULTI_USER 1
70 # else
71 #  define _USER fa
72 # endif
73 #endif
74 
75 #ifdef CONFIG_CPU_SA1100
76 # ifdef _USER
77 #  define MULTI_USER 1
78 # else
79 #  define _USER v4_mc
80 # endif
81 #endif
82 
83 #ifdef CONFIG_CPU_XSCALE
84 # ifdef _USER
85 #  define MULTI_USER 1
86 # else
87 #  define _USER xscale_mc
88 # endif
89 #endif
90 
91 #ifdef CONFIG_CPU_XSC3
92 # ifdef _USER
93 #  define MULTI_USER 1
94 # else
95 #  define _USER xsc3_mc
96 # endif
97 #endif
98 
99 #ifdef CONFIG_CPU_COPY_V6
100 # define MULTI_USER 1
101 #endif
102 
103 #if !defined(_USER) && !defined(MULTI_USER)
104 #error Unknown user operations model
105 #endif
106 
107 struct page;
108 struct vm_area_struct;
109 
110 struct cpu_user_fns {
111 	void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
112 	void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
113 			unsigned long vaddr, struct vm_area_struct *vma);
114 };
115 
116 #ifdef MULTI_USER
117 extern struct cpu_user_fns cpu_user;
118 
119 #define __cpu_clear_user_highpage	cpu_user.cpu_clear_user_highpage
120 #define __cpu_copy_user_highpage	cpu_user.cpu_copy_user_highpage
121 
122 #else
123 
124 #define __cpu_clear_user_highpage	__glue(_USER,_clear_user_highpage)
125 #define __cpu_copy_user_highpage	__glue(_USER,_copy_user_highpage)
126 
127 extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
128 extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
129 			unsigned long vaddr, struct vm_area_struct *vma);
130 #endif
131 
132 #define clear_user_highpage(page,vaddr)		\
133 	 __cpu_clear_user_highpage(page, vaddr)
134 
135 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
136 #define copy_user_highpage(to,from,vaddr,vma)	\
137 	__cpu_copy_user_highpage(to, from, vaddr, vma)
138 
139 #define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
140 extern void copy_page(void *to, const void *from);
141 
142 #ifdef CONFIG_KUSER_HELPERS
143 #define __HAVE_ARCH_GATE_AREA 1
144 #endif
145 
146 #ifdef CONFIG_ARM_LPAE
147 #include <asm/pgtable-3level-types.h>
148 #else
149 #include <asm/pgtable-2level-types.h>
150 #endif
151 
152 #endif /* CONFIG_MMU */
153 
154 typedef struct page *pgtable_t;
155 
156 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
157 extern int pfn_valid(unsigned long);
158 #endif
159 
160 #include <asm/memory.h>
161 
162 #endif /* !__ASSEMBLY__ */
163 
164 #define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_TSK_EXEC
165 
166 #include <asm-generic/getorder.h>
167 
168 #endif
169