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1 | #ifndef _ASM_POWERPC_PAGE_H |
2 | #define _ASM_POWERPC_PAGE_H | |
3 | ||
4 | /* | |
5 | * Copyright (C) 2001,2005 IBM Corporation. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #ifdef __KERNEL__ | |
14 | #include <linux/config.h> | |
15 | #include <asm/asm-compat.h> | |
16 | ||
17 | /* | |
18 | * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software | |
19 | * page size. When using 64K pages however, whether we are really supporting | |
20 | * 64K pages in HW or not is irrelevant to those definitions. | |
21 | */ | |
22 | #ifdef CONFIG_PPC_64K_PAGES | |
23 | #define PAGE_SHIFT 16 | |
24 | #else | |
25 | #define PAGE_SHIFT 12 | |
26 | #endif | |
27 | ||
28 | #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) | |
29 | ||
30 | /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ | |
31 | #define __HAVE_ARCH_GATE_AREA 1 | |
32 | ||
33 | /* | |
34 | * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we | |
35 | * assign PAGE_MASK to a larger type it gets extended the way we want | |
36 | * (i.e. with 1s in the high bits) | |
37 | */ | |
38 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
39 | ||
40 | #define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START) | |
41 | #define KERNELBASE PAGE_OFFSET | |
42 | ||
43 | #ifdef CONFIG_DISCONTIGMEM | |
44 | #define page_to_pfn(page) discontigmem_page_to_pfn(page) | |
45 | #define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn) | |
46 | #define pfn_valid(pfn) discontigmem_pfn_valid(pfn) | |
47 | #endif | |
48 | ||
49 | #ifdef CONFIG_FLATMEM | |
50 | #define pfn_to_page(pfn) (mem_map + (pfn)) | |
51 | #define page_to_pfn(page) ((unsigned long)((page) - mem_map)) | |
52 | #define pfn_valid(pfn) ((pfn) < max_mapnr) | |
53 | #endif | |
54 | ||
55 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
56 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
57 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
58 | ||
59 | #define __va(x) ((void *)((unsigned long)(x) + KERNELBASE)) | |
60 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET) | |
61 | ||
62 | /* | |
63 | * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, | |
64 | * and needs to be executable. This means the whole heap ends | |
65 | * up being executable. | |
66 | */ | |
67 | #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ | |
68 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
69 | ||
70 | #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ | |
71 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
72 | ||
73 | #ifdef __powerpc64__ | |
74 | #include <asm/page_64.h> | |
75 | #else | |
76 | #include <asm/page_32.h> | |
77 | #endif | |
78 | ||
79 | /* align addr on a size boundary - adjust address up/down if needed */ | |
80 | #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1))) | |
81 | #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1))) | |
82 | ||
83 | /* align addr on a size boundary - adjust address up if needed */ | |
84 | #define _ALIGN(addr,size) _ALIGN_UP(addr,size) | |
85 | ||
86 | /* to align the pointer to the (next) page boundary */ | |
87 | #define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE) | |
88 | ||
51fae6de ME |
89 | /* |
90 | * Don't compare things with KERNELBASE or PAGE_OFFSET to test for | |
91 | * "kernelness", use is_kernel_addr() - it should do what you want. | |
92 | */ | |
93 | #define is_kernel_addr(x) ((x) >= PAGE_OFFSET) | |
94 | ||
5cd16ee9 ME |
95 | #ifndef __ASSEMBLY__ |
96 | ||
97 | #undef STRICT_MM_TYPECHECKS | |
98 | ||
99 | #ifdef STRICT_MM_TYPECHECKS | |
100 | /* These are used to make use of C type-checking. */ | |
101 | ||
102 | /* PTE level */ | |
103 | typedef struct { pte_basic_t pte; } pte_t; | |
104 | #define pte_val(x) ((x).pte) | |
105 | #define __pte(x) ((pte_t) { (x) }) | |
106 | ||
107 | /* 64k pages additionally define a bigger "real PTE" type that gathers | |
108 | * the "second half" part of the PTE for pseudo 64k pages | |
109 | */ | |
110 | #ifdef CONFIG_PPC_64K_PAGES | |
111 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; | |
112 | #else | |
113 | typedef struct { pte_t pte; } real_pte_t; | |
114 | #endif | |
115 | ||
116 | /* PMD level */ | |
117 | typedef struct { unsigned long pmd; } pmd_t; | |
118 | #define pmd_val(x) ((x).pmd) | |
119 | #define __pmd(x) ((pmd_t) { (x) }) | |
120 | ||
121 | /* PUD level exusts only on 4k pages */ | |
122 | #ifndef CONFIG_PPC_64K_PAGES | |
123 | typedef struct { unsigned long pud; } pud_t; | |
124 | #define pud_val(x) ((x).pud) | |
125 | #define __pud(x) ((pud_t) { (x) }) | |
126 | #endif | |
127 | ||
128 | /* PGD level */ | |
129 | typedef struct { unsigned long pgd; } pgd_t; | |
130 | #define pgd_val(x) ((x).pgd) | |
131 | #define __pgd(x) ((pgd_t) { (x) }) | |
132 | ||
133 | /* Page protection bits */ | |
134 | typedef struct { unsigned long pgprot; } pgprot_t; | |
135 | #define pgprot_val(x) ((x).pgprot) | |
136 | #define __pgprot(x) ((pgprot_t) { (x) }) | |
137 | ||
138 | #else | |
139 | ||
140 | /* | |
141 | * .. while these make it easier on the compiler | |
142 | */ | |
143 | ||
144 | typedef pte_basic_t pte_t; | |
145 | #define pte_val(x) (x) | |
146 | #define __pte(x) (x) | |
147 | ||
148 | #ifdef CONFIG_PPC_64K_PAGES | |
149 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; | |
150 | #else | |
151 | typedef unsigned long real_pte_t; | |
152 | #endif | |
153 | ||
154 | ||
155 | typedef unsigned long pmd_t; | |
156 | #define pmd_val(x) (x) | |
157 | #define __pmd(x) (x) | |
158 | ||
159 | #ifndef CONFIG_PPC_64K_PAGES | |
160 | typedef unsigned long pud_t; | |
161 | #define pud_val(x) (x) | |
162 | #define __pud(x) (x) | |
163 | #endif | |
164 | ||
165 | typedef unsigned long pgd_t; | |
166 | #define pgd_val(x) (x) | |
167 | #define pgprot_val(x) (x) | |
168 | ||
169 | typedef unsigned long pgprot_t; | |
170 | #define __pgd(x) (x) | |
171 | #define __pgprot(x) (x) | |
172 | ||
173 | #endif | |
174 | ||
175 | struct page; | |
176 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); | |
177 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, | |
178 | struct page *p); | |
179 | extern int page_is_ram(unsigned long pfn); | |
180 | ||
181 | #endif /* __ASSEMBLY__ */ | |
182 | ||
183 | #endif /* __KERNEL__ */ | |
184 | ||
185 | #endif /* _ASM_POWERPC_PAGE_H */ |