tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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
14#ifndef __ASSEMBLY__
15
16#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
17#define free_user_page(page, addr) free_page(addr)
18
19#define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
20#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
21
22struct vm_area_struct;
23struct page;
24
25#define __HAVE_ARCH_COPY_USER_HIGHPAGE
26
27void copy_user_highpage(struct page *to, struct page *from,
28 unsigned long u_vaddr, struct vm_area_struct *vma);
29void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
30
31#undef STRICT_MM_TYPECHECKS
32
33#ifdef STRICT_MM_TYPECHECKS
34/*
35 * These are used to make use of C type-checking..
36 */
37typedef struct {
38 unsigned long pte;
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#define ARCH_PFN_OFFSET (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
80
81#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
82
83/*
84 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
85 *
86 * These macros have historically been misnamed
87 * virt here means link-address/program-address as embedded in object code.
88 * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
89 * 128th page, and virt_to_page( ) will return the struct page corresp to it.
90 * mem_map[ ] is an array of struct page for each page frame in the system
91 *
92 * Independent of where linux is linked at, link-addr = physical address
93 * So the old macro __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
94 * would have been wrong in case kernel is not at 0x8zs
95 */
96#define __pa(vaddr) ((unsigned long)vaddr)
97#define __va(paddr) ((void *)((unsigned long)(paddr)))
98
99#define virt_to_page(kaddr) \
100 (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
101
102#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
103
104/* Default Permissions for stack/heaps pages (Non Executable) */
105#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
106
107#define WANT_PAGE_VIRTUAL 1
108
109#include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
110#include <asm-generic/getorder.h>
111
112#endif /* !__ASSEMBLY__ */
113
114#endif