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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 */
5#ifndef __ASM_ARC_PAGE_H
6#define __ASM_ARC_PAGE_H
7
8#include <uapi/asm/page.h>
9
10#ifndef __ASSEMBLY__
11
12#define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
13#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
14#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
15
16struct vm_area_struct;
17struct page;
18
19#define __HAVE_ARCH_COPY_USER_HIGHPAGE
20
21void copy_user_highpage(struct page *to, struct page *from,
22 unsigned long u_vaddr, struct vm_area_struct *vma);
23void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
24
25#undef STRICT_MM_TYPECHECKS
26
27#ifdef STRICT_MM_TYPECHECKS
28/*
29 * These are used to make use of C type-checking..
30 */
31typedef struct {
32#ifdef CONFIG_ARC_HAS_PAE40
33 unsigned long long pte;
34#else
35 unsigned long pte;
36#endif
37} pte_t;
38typedef struct {
39 unsigned long pgd;
40} pgd_t;
41typedef struct {
42 unsigned long pgprot;
43} pgprot_t;
44
45#define pte_val(x) ((x).pte)
46#define pgd_val(x) ((x).pgd)
47#define pgprot_val(x) ((x).pgprot)
48
49#define __pte(x) ((pte_t) { (x) })
50#define __pgd(x) ((pgd_t) { (x) })
51#define __pgprot(x) ((pgprot_t) { (x) })
52
53#define pte_pgprot(x) __pgprot(pte_val(x))
54
55#else /* !STRICT_MM_TYPECHECKS */
56
57#ifdef CONFIG_ARC_HAS_PAE40
58typedef unsigned long long pte_t;
59#else
60typedef unsigned long pte_t;
61#endif
62typedef unsigned long pgd_t;
63typedef unsigned long pgprot_t;
64
65#define pte_val(x) (x)
66#define pgd_val(x) (x)
67#define pgprot_val(x) (x)
68#define __pte(x) (x)
69#define __pgd(x) (x)
70#define __pgprot(x) (x)
71#define pte_pgprot(x) (x)
72
73#endif
74
75typedef pte_t * pgtable_t;
76
77/*
78 * Use virt_to_pfn with caution:
79 * If used in pte or paddr related macros, it could cause truncation
80 * in PAE40 builds
81 * As a rule of thumb, only use it in helpers starting with virt_
82 * You have been warned !
83 */
84#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
85
86/*
87 * When HIGHMEM is enabled we have holes in the memory map so we need
88 * pfn_valid() that takes into account the actual extents of the physical
89 * memory
90 */
91#ifdef CONFIG_HIGHMEM
92
93extern unsigned long arch_pfn_offset;
94#define ARCH_PFN_OFFSET arch_pfn_offset
95
96extern int pfn_valid(unsigned long pfn);
97#define pfn_valid pfn_valid
98
99#else /* CONFIG_HIGHMEM */
100
101#define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
102#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
103
104#endif /* CONFIG_HIGHMEM */
105
106/*
107 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
108 *
109 * These macros have historically been misnamed
110 * virt here means link-address/program-address as embedded in object code.
111 * And for ARC, link-addr = physical address
112 */
113#define __pa(vaddr) ((unsigned long)(vaddr))
114#define __va(paddr) ((void *)((unsigned long)(paddr)))
115
116#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
117#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
118
119/* Default Permissions for stack/heaps pages (Non Executable) */
120#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
121
122#define WANT_PAGE_VIRTUAL 1
123
124#include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
125#include <asm-generic/getorder.h>
126
127#endif /* !__ASSEMBLY__ */
128
129#endif