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5cd16ee9 ME |
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 | ||
5cd16ee9 | 13 | #include <asm/asm-compat.h> |
47310413 | 14 | #include <asm/kdump.h> |
5cd16ee9 ME |
15 | |
16 | /* | |
17 | * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software | |
18 | * page size. When using 64K pages however, whether we are really supporting | |
19 | * 64K pages in HW or not is irrelevant to those definitions. | |
20 | */ | |
21 | #ifdef CONFIG_PPC_64K_PAGES | |
22 | #define PAGE_SHIFT 16 | |
23 | #else | |
24 | #define PAGE_SHIFT 12 | |
25 | #endif | |
26 | ||
27 | #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) | |
28 | ||
29 | /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ | |
30 | #define __HAVE_ARCH_GATE_AREA 1 | |
31 | ||
32 | /* | |
33 | * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we | |
34 | * assign PAGE_MASK to a larger type it gets extended the way we want | |
35 | * (i.e. with 1s in the high bits) | |
36 | */ | |
37 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
38 | ||
b5666f70 ME |
39 | /* |
40 | * KERNELBASE is the virtual address of the start of the kernel, it's often | |
41 | * the same as PAGE_OFFSET, but _might not be_. | |
42 | * | |
43 | * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. | |
44 | * | |
45 | * To get a physical address from a virtual one you subtract PAGE_OFFSET, | |
46 | * _not_ KERNELBASE. | |
47 | * | |
48 | * If you want to know something's offset from the start of the kernel you | |
49 | * should subtract KERNELBASE. | |
50 | * | |
51 | * If you want to test if something's a kernel address, use is_kernel_addr(). | |
52 | */ | |
398ab1fc | 53 | |
5cd16ee9 | 54 | #define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START) |
398ab1fc | 55 | #define KERNELBASE (PAGE_OFFSET + PHYSICAL_START) |
5cd16ee9 | 56 | |
5cd16ee9 | 57 | #ifdef CONFIG_FLATMEM |
5cd16ee9 ME |
58 | #define pfn_valid(pfn) ((pfn) < max_mapnr) |
59 | #endif | |
60 | ||
61 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
62 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
63 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
64 | ||
b5666f70 | 65 | #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET)) |
5cd16ee9 ME |
66 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET) |
67 | ||
68 | /* | |
69 | * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, | |
70 | * and needs to be executable. This means the whole heap ends | |
71 | * up being executable. | |
72 | */ | |
73 | #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ | |
74 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
75 | ||
76 | #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ | |
77 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
78 | ||
79 | #ifdef __powerpc64__ | |
80 | #include <asm/page_64.h> | |
81 | #else | |
82 | #include <asm/page_32.h> | |
83 | #endif | |
84 | ||
85 | /* align addr on a size boundary - adjust address up/down if needed */ | |
86 | #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1))) | |
87 | #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1))) | |
88 | ||
89 | /* align addr on a size boundary - adjust address up if needed */ | |
90 | #define _ALIGN(addr,size) _ALIGN_UP(addr,size) | |
91 | ||
92 | /* to align the pointer to the (next) page boundary */ | |
93 | #define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE) | |
94 | ||
51fae6de ME |
95 | /* |
96 | * Don't compare things with KERNELBASE or PAGE_OFFSET to test for | |
97 | * "kernelness", use is_kernel_addr() - it should do what you want. | |
98 | */ | |
99 | #define is_kernel_addr(x) ((x) >= PAGE_OFFSET) | |
100 | ||
5cd16ee9 ME |
101 | #ifndef __ASSEMBLY__ |
102 | ||
103 | #undef STRICT_MM_TYPECHECKS | |
104 | ||
105 | #ifdef STRICT_MM_TYPECHECKS | |
106 | /* These are used to make use of C type-checking. */ | |
107 | ||
108 | /* PTE level */ | |
109 | typedef struct { pte_basic_t pte; } pte_t; | |
110 | #define pte_val(x) ((x).pte) | |
111 | #define __pte(x) ((pte_t) { (x) }) | |
112 | ||
113 | /* 64k pages additionally define a bigger "real PTE" type that gathers | |
114 | * the "second half" part of the PTE for pseudo 64k pages | |
115 | */ | |
116 | #ifdef CONFIG_PPC_64K_PAGES | |
117 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; | |
118 | #else | |
119 | typedef struct { pte_t pte; } real_pte_t; | |
120 | #endif | |
121 | ||
122 | /* PMD level */ | |
d1953c88 | 123 | #ifdef CONFIG_PPC64 |
5cd16ee9 ME |
124 | typedef struct { unsigned long pmd; } pmd_t; |
125 | #define pmd_val(x) ((x).pmd) | |
126 | #define __pmd(x) ((pmd_t) { (x) }) | |
127 | ||
128 | /* PUD level exusts only on 4k pages */ | |
d1953c88 | 129 | #ifndef CONFIG_PPC_64K_PAGES |
5cd16ee9 ME |
130 | typedef struct { unsigned long pud; } pud_t; |
131 | #define pud_val(x) ((x).pud) | |
132 | #define __pud(x) ((pud_t) { (x) }) | |
d1953c88 DG |
133 | #endif /* !CONFIG_PPC_64K_PAGES */ |
134 | #endif /* CONFIG_PPC64 */ | |
5cd16ee9 ME |
135 | |
136 | /* PGD level */ | |
137 | typedef struct { unsigned long pgd; } pgd_t; | |
138 | #define pgd_val(x) ((x).pgd) | |
139 | #define __pgd(x) ((pgd_t) { (x) }) | |
140 | ||
141 | /* Page protection bits */ | |
142 | typedef struct { unsigned long pgprot; } pgprot_t; | |
143 | #define pgprot_val(x) ((x).pgprot) | |
144 | #define __pgprot(x) ((pgprot_t) { (x) }) | |
145 | ||
146 | #else | |
147 | ||
148 | /* | |
149 | * .. while these make it easier on the compiler | |
150 | */ | |
151 | ||
152 | typedef pte_basic_t pte_t; | |
153 | #define pte_val(x) (x) | |
154 | #define __pte(x) (x) | |
155 | ||
156 | #ifdef CONFIG_PPC_64K_PAGES | |
157 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; | |
158 | #else | |
159 | typedef unsigned long real_pte_t; | |
160 | #endif | |
161 | ||
162 | ||
d1953c88 | 163 | #ifdef CONFIG_PPC64 |
5cd16ee9 ME |
164 | typedef unsigned long pmd_t; |
165 | #define pmd_val(x) (x) | |
166 | #define __pmd(x) (x) | |
167 | ||
d1953c88 | 168 | #ifndef CONFIG_PPC_64K_PAGES |
5cd16ee9 ME |
169 | typedef unsigned long pud_t; |
170 | #define pud_val(x) (x) | |
171 | #define __pud(x) (x) | |
d1953c88 DG |
172 | #endif /* !CONFIG_PPC_64K_PAGES */ |
173 | #endif /* CONFIG_PPC64 */ | |
5cd16ee9 ME |
174 | |
175 | typedef unsigned long pgd_t; | |
176 | #define pgd_val(x) (x) | |
177 | #define pgprot_val(x) (x) | |
178 | ||
179 | typedef unsigned long pgprot_t; | |
180 | #define __pgd(x) (x) | |
181 | #define __pgprot(x) (x) | |
182 | ||
183 | #endif | |
184 | ||
185 | struct page; | |
186 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); | |
187 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, | |
188 | struct page *p); | |
189 | extern int page_is_ram(unsigned long pfn); | |
190 | ||
a5bba930 | 191 | struct vm_area_struct; |
a5bba930 | 192 | |
2f569afd MS |
193 | typedef struct page *pgtable_t; |
194 | ||
659e3505 | 195 | #include <asm-generic/memory_model.h> |
5cd16ee9 ME |
196 | #endif /* __ASSEMBLY__ */ |
197 | ||
5cd16ee9 | 198 | #endif /* _ASM_POWERPC_PAGE_H */ |