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