tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PAGE_H
10#define _ASM_PAGE_H
11
12#include <linux/config.h>
13
14#ifdef __KERNEL__
15
16#include <spaces.h>
17
18#endif
19
20/*
21 * PAGE_SHIFT determines the page size
22 */
23#ifdef CONFIG_PAGE_SIZE_4KB
24#define PAGE_SHIFT 12
25#endif
26#ifdef CONFIG_PAGE_SIZE_8KB
27#define PAGE_SHIFT 13
28#endif
29#ifdef CONFIG_PAGE_SIZE_16KB
30#define PAGE_SHIFT 14
31#endif
32#ifdef CONFIG_PAGE_SIZE_64KB
33#define PAGE_SHIFT 16
34#endif
35#define PAGE_SIZE (1UL << PAGE_SHIFT)
36#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
37
38
39#ifdef __KERNEL__
40#ifndef __ASSEMBLY__
41
42extern void clear_page(void * page);
43extern void copy_page(void * to, void * from);
44
45extern unsigned long shm_align_mask;
46
47static inline unsigned long pages_do_alias(unsigned long addr1,
48 unsigned long addr2)
49{
50 return (addr1 ^ addr2) & shm_align_mask;
51}
52
53struct page;
54
55static inline void clear_user_page(void *addr, unsigned long vaddr,
56 struct page *page)
57{
58 extern void (*flush_data_cache_page)(unsigned long addr);
59
60 clear_page(addr);
61 if (pages_do_alias((unsigned long) addr, vaddr))
62 flush_data_cache_page((unsigned long)addr);
63}
64
65static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
66 struct page *to)
67{
68 extern void (*flush_data_cache_page)(unsigned long addr);
69
70 copy_page(vto, vfrom);
71 if (pages_do_alias((unsigned long)vto, vaddr))
72 flush_data_cache_page((unsigned long)vto);
73}
74
75/*
76 * These are used to make use of C type-checking..
77 */
78#ifdef CONFIG_64BIT_PHYS_ADDR
79 #ifdef CONFIG_CPU_MIPS32
80 typedef struct { unsigned long pte_low, pte_high; } pte_t;
81 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
82 #else
83 typedef struct { unsigned long long pte; } pte_t;
84 #define pte_val(x) ((x).pte)
85 #endif
86#else
87typedef struct { unsigned long pte; } pte_t;
88#define pte_val(x) ((x).pte)
89#endif
90
91typedef struct { unsigned long pmd; } pmd_t;
92typedef struct { unsigned long pgd; } pgd_t;
93typedef struct { unsigned long pgprot; } pgprot_t;
94
95#define pmd_val(x) ((x).pmd)
96#define pgd_val(x) ((x).pgd)
97#define pgprot_val(x) ((x).pgprot)
98
99#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
100
101#define __pte(x) ((pte_t) { (x) } )
102#define __pmd(x) ((pmd_t) { (x) } )
103#define __pgd(x) ((pgd_t) { (x) } )
104#define __pgprot(x) ((pgprot_t) { (x) } )
105
106#endif /* !__ASSEMBLY__ */
107
108/* to align the pointer to the (next) page boundary */
109#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
110
111#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
112#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
113
114#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
115
116#ifndef CONFIG_NEED_MULTIPLE_NODES
117#define pfn_to_page(pfn) (mem_map + (pfn))
118#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
119#define pfn_valid(pfn) ((pfn) < max_mapnr)
120#endif
121
122#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
123#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
124
125#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
126 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
127
128#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
129#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
130
131#endif /* defined (__KERNEL__) */
132
133#ifdef CONFIG_LIMITED_DMA
134#define WANT_PAGE_VIRTUAL
135#endif
136
137#include <asm-generic/page.h>
138
139#endif /* _ASM_PAGE_H */