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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#ifdef CONFIG_ARC_HAS_PAE40
11
12#define MAX_POSSIBLE_PHYSMEM_BITS 40
13#define PAGE_MASK_PHYS (0xff00000000ull | PAGE_MASK)
14
15#else /* CONFIG_ARC_HAS_PAE40 */
16
17#define MAX_POSSIBLE_PHYSMEM_BITS 32
18#define PAGE_MASK_PHYS PAGE_MASK
19
20#endif /* CONFIG_ARC_HAS_PAE40 */
21
22#ifndef __ASSEMBLY__
23
24#define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
25#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
26#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
27
28struct vm_area_struct;
29struct page;
30
31#define __HAVE_ARCH_COPY_USER_HIGHPAGE
32
33void copy_user_highpage(struct page *to, struct page *from,
34 unsigned long u_vaddr, struct vm_area_struct *vma);
35void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
36
37#undef STRICT_MM_TYPECHECKS
38
39#ifdef STRICT_MM_TYPECHECKS
40/*
41 * These are used to make use of C type-checking..
42 */
43typedef struct {
44#ifdef CONFIG_ARC_HAS_PAE40
45 unsigned long long pte;
46#else
47 unsigned long pte;
48#endif
49} pte_t;
50typedef struct {
51 unsigned long pgd;
52} pgd_t;
53typedef struct {
54 unsigned long pgprot;
55} pgprot_t;
56
57#define pte_val(x) ((x).pte)
58#define pgd_val(x) ((x).pgd)
59#define pgprot_val(x) ((x).pgprot)
60
61#define __pte(x) ((pte_t) { (x) })
62#define __pgd(x) ((pgd_t) { (x) })
63#define __pgprot(x) ((pgprot_t) { (x) })
64
65#define pte_pgprot(x) __pgprot(pte_val(x))
66
67#else /* !STRICT_MM_TYPECHECKS */
68
69#ifdef CONFIG_ARC_HAS_PAE40
70typedef unsigned long long pte_t;
71#else
72typedef unsigned long pte_t;
73#endif
74typedef unsigned long pgd_t;
75typedef unsigned long pgprot_t;
76
77#define pte_val(x) (x)
78#define pgd_val(x) (x)
79#define pgprot_val(x) (x)
80#define __pte(x) (x)
81#define __pgd(x) (x)
82#define __pgprot(x) (x)
83#define pte_pgprot(x) (x)
84
85#endif
86
87typedef pte_t * pgtable_t;
88
89/*
90 * Use virt_to_pfn with caution:
91 * If used in pte or paddr related macros, it could cause truncation
92 * in PAE40 builds
93 * As a rule of thumb, only use it in helpers starting with virt_
94 * You have been warned !
95 */
96#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
97
98/*
99 * When HIGHMEM is enabled we have holes in the memory map so we need
100 * pfn_valid() that takes into account the actual extents of the physical
101 * memory
102 */
103#ifdef CONFIG_HIGHMEM
104
105extern unsigned long arch_pfn_offset;
106#define ARCH_PFN_OFFSET arch_pfn_offset
107
108extern int pfn_valid(unsigned long pfn);
109#define pfn_valid pfn_valid
110
111#else /* CONFIG_HIGHMEM */
112
113#define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
114#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
115
116#endif /* CONFIG_HIGHMEM */
117
118/*
119 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
120 *
121 * These macros have historically been misnamed
122 * virt here means link-address/program-address as embedded in object code.
123 * And for ARC, link-addr = physical address
124 */
125#define __pa(vaddr) ((unsigned long)(vaddr))
126#define __va(paddr) ((void *)((unsigned long)(paddr)))
127
128#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
129#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
130
131/* Default Permissions for stack/heaps pages (Non Executable) */
132#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
133
134#define WANT_PAGE_VIRTUAL 1
135
136#include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
137#include <asm-generic/getorder.h>
138
139#endif /* !__ASSEMBLY__ */
140
141#endif