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		CONFIG_PAGE_SHIFT
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
107struct page;
108struct vm_area_struct;
109
110struct 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
116void fa_copy_user_highpage(struct page *to, struct page *from,
117	unsigned long vaddr, struct vm_area_struct *vma);
118void fa_clear_user_highpage(struct page *page, unsigned long vaddr);
119void feroceon_copy_user_highpage(struct page *to, struct page *from,
120	unsigned long vaddr, struct vm_area_struct *vma);
121void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr);
122void v4_mc_copy_user_highpage(struct page *to, struct page *from,
123	unsigned long vaddr, struct vm_area_struct *vma);
124void v4_mc_clear_user_highpage(struct page *page, unsigned long vaddr);
125void v4wb_copy_user_highpage(struct page *to, struct page *from,
126	unsigned long vaddr, struct vm_area_struct *vma);
127void v4wb_clear_user_highpage(struct page *page, unsigned long vaddr);
128void v4wt_copy_user_highpage(struct page *to, struct page *from,
129	unsigned long vaddr, struct vm_area_struct *vma);
130void v4wt_clear_user_highpage(struct page *page, unsigned long vaddr);
131void xsc3_mc_copy_user_highpage(struct page *to, struct page *from,
132	unsigned long vaddr, struct vm_area_struct *vma);
133void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr);
134void xscale_mc_copy_user_highpage(struct page *to, struct page *from,
135	unsigned long vaddr, struct vm_area_struct *vma);
136void xscale_mc_clear_user_highpage(struct page *page, unsigned long vaddr);
137
138#ifdef MULTI_USER
139extern struct cpu_user_fns cpu_user;
140
141#define __cpu_clear_user_highpage	cpu_user.cpu_clear_user_highpage
142#define __cpu_copy_user_highpage	cpu_user.cpu_copy_user_highpage
143
144#else
145
146#define __cpu_clear_user_highpage	__glue(_USER,_clear_user_highpage)
147#define __cpu_copy_user_highpage	__glue(_USER,_copy_user_highpage)
148
149extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
150extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
151			unsigned long vaddr, struct vm_area_struct *vma);
152#endif
153
154#define clear_user_highpage(page,vaddr)		\
155	 __cpu_clear_user_highpage(page, vaddr)
156
157#define __HAVE_ARCH_COPY_USER_HIGHPAGE
158#define copy_user_highpage(to,from,vaddr,vma)	\
159	__cpu_copy_user_highpage(to, from, vaddr, vma)
160
161#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
162extern void copy_page(void *to, const void *from);
163
164#ifdef CONFIG_KUSER_HELPERS
165#define __HAVE_ARCH_GATE_AREA 1
166#endif
167
168#ifdef CONFIG_ARM_LPAE
169#include <asm/pgtable-3level-types.h>
170#else
171#include <asm/pgtable-2level-types.h>
172#ifdef CONFIG_VMAP_STACK
173#define ARCH_PAGE_TABLE_SYNC_MASK	PGTBL_PMD_MODIFIED
174#endif
175#endif
176
177#endif /* CONFIG_MMU */
178
179typedef struct page *pgtable_t;
180
181#ifdef CONFIG_HAVE_ARCH_PFN_VALID
182extern int pfn_valid(unsigned long);
183#define pfn_valid pfn_valid
184#endif
185
186#endif /* !__ASSEMBLY__ */
187
188#include <asm/memory.h>
189
190#define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_TSK_EXEC
191
192#include <asm-generic/getorder.h>
193#include <asm-generic/memory_model.h>
194
195#endif
196