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/* TBD: for now don't worry about VIPT D$ aliasing */
20#define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
21#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
22
23#define clear_user_page(addr, vaddr, pg) clear_page(addr)
24#define copy_user_page(vto, vfrom, vaddr, pg) copy_page(vto, vfrom)
25
26#undef STRICT_MM_TYPECHECKS
27
28#ifdef STRICT_MM_TYPECHECKS
29/*
30 * These are used to make use of C type-checking..
31 */
32typedef struct {
33 unsigned long pte;
34} pte_t;
35typedef struct {
36 unsigned long pgd;
37} pgd_t;
38typedef struct {
39 unsigned long pgprot;
40} pgprot_t;
41typedef unsigned long pgtable_t;
42
43#define pte_val(x) ((x).pte)
44#define pgd_val(x) ((x).pgd)
45#define pgprot_val(x) ((x).pgprot)
46
47#define __pte(x) ((pte_t) { (x) })
48#define __pgd(x) ((pgd_t) { (x) })
49#define __pgprot(x) ((pgprot_t) { (x) })
50
51#define pte_pgprot(x) __pgprot(pte_val(x))
52
53#else /* !STRICT_MM_TYPECHECKS */
54
55typedef unsigned long pte_t;
56typedef unsigned long pgd_t;
57typedef unsigned long pgprot_t;
58typedef unsigned long pgtable_t;
59
60#define pte_val(x) (x)
61#define pgd_val(x) (x)
62#define pgprot_val(x) (x)
63#define __pte(x) (x)
64#define __pgprot(x) (x)
65#define pte_pgprot(x) (x)
66
67#endif
68
69#define ARCH_PFN_OFFSET (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
70
71#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
72
73/*
74 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
75 *
76 * These macros have historically been misnamed
77 * virt here means link-address/program-address as embedded in object code.
78 * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
79 * 128th page, and virt_to_page( ) will return the struct page corresp to it.
80 * mem_map[ ] is an array of struct page for each page frame in the system
81 *
82 * Independent of where linux is linked at, link-addr = physical address
83 * So the old macro __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
84 * would have been wrong in case kernel is not at 0x8zs
85 */
86#define __pa(vaddr) ((unsigned long)vaddr)
87#define __va(paddr) ((void *)((unsigned long)(paddr)))
88
89#define virt_to_page(kaddr) \
90 (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
91
92#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
93
94/* Default Permissions for page, used in mmap.c */
95#ifdef CONFIG_ARC_STACK_NONEXEC
96#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
97#else
98#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
99 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
100#endif
101
102#define WANT_PAGE_VIRTUAL 1
103
104#include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
105#include <asm-generic/getorder.h>
106
107#endif /* !__ASSEMBLY__ */
108
109#endif