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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> |
37dd2bad | 15 | #include <asm/types.h> |
5cd16ee9 ME |
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 | ||
b5666f70 ME |
40 | /* |
41 | * KERNELBASE is the virtual address of the start of the kernel, it's often | |
42 | * the same as PAGE_OFFSET, but _might not be_. | |
43 | * | |
44 | * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. | |
45 | * | |
37dd2bad KG |
46 | * PAGE_OFFSET is the virtual address of the start of lowmem. |
47 | * | |
48 | * PHYSICAL_START is the physical address of the start of the kernel. | |
49 | * | |
50 | * MEMORY_START is the physical address of the start of lowmem. | |
51 | * | |
52 | * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on | |
53 | * ppc32 and based on how they are set we determine MEMORY_START. | |
54 | * | |
55 | * For the linear mapping the following equation should be true: | |
56 | * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START | |
57 | * | |
58 | * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START | |
59 | * | |
60 | * There are two was to determine a physical address from a virtual one: | |
61 | * va = pa + PAGE_OFFSET - MEMORY_START | |
62 | * va = pa + KERNELBASE - PHYSICAL_START | |
b5666f70 ME |
63 | * |
64 | * If you want to know something's offset from the start of the kernel you | |
65 | * should subtract KERNELBASE. | |
66 | * | |
67 | * If you want to test if something's a kernel address, use is_kernel_addr(). | |
68 | */ | |
398ab1fc | 69 | |
37dd2bad KG |
70 | #define KERNELBASE ASM_CONST(CONFIG_KERNEL_START) |
71 | #define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET) | |
72 | #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START)) | |
73 | ||
74 | #if defined(CONFIG_RELOCATABLE) && defined(CONFIG_FLATMEM) | |
75 | #ifndef __ASSEMBLY__ | |
76 | extern phys_addr_t memstart_addr; | |
77 | extern phys_addr_t kernstart_addr; | |
78 | #endif | |
79 | #define PHYSICAL_START kernstart_addr | |
80 | #define MEMORY_START memstart_addr | |
81 | #else | |
82 | #define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START) | |
83 | #define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE) | |
84 | #endif | |
5cd16ee9 | 85 | |
5cd16ee9 | 86 | #ifdef CONFIG_FLATMEM |
37dd2bad KG |
87 | #define ARCH_PFN_OFFSET (MEMORY_START >> PAGE_SHIFT) |
88 | #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr)) | |
5cd16ee9 ME |
89 | #endif |
90 | ||
91 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
92 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
93 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
94 | ||
37dd2bad KG |
95 | #define __va(x) ((void *)((unsigned long)(x) - PHYSICAL_START + KERNELBASE)) |
96 | #define __pa(x) ((unsigned long)(x) + PHYSICAL_START - KERNELBASE) | |
5cd16ee9 ME |
97 | |
98 | /* | |
99 | * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, | |
100 | * and needs to be executable. This means the whole heap ends | |
101 | * up being executable. | |
102 | */ | |
103 | #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ | |
104 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
105 | ||
106 | #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ | |
107 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
108 | ||
109 | #ifdef __powerpc64__ | |
110 | #include <asm/page_64.h> | |
111 | #else | |
112 | #include <asm/page_32.h> | |
113 | #endif | |
114 | ||
115 | /* align addr on a size boundary - adjust address up/down if needed */ | |
116 | #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1))) | |
117 | #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1))) | |
118 | ||
119 | /* align addr on a size boundary - adjust address up if needed */ | |
120 | #define _ALIGN(addr,size) _ALIGN_UP(addr,size) | |
121 | ||
122 | /* to align the pointer to the (next) page boundary */ | |
123 | #define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE) | |
124 | ||
51fae6de ME |
125 | /* |
126 | * Don't compare things with KERNELBASE or PAGE_OFFSET to test for | |
127 | * "kernelness", use is_kernel_addr() - it should do what you want. | |
128 | */ | |
129 | #define is_kernel_addr(x) ((x) >= PAGE_OFFSET) | |
130 | ||
5cd16ee9 ME |
131 | #ifndef __ASSEMBLY__ |
132 | ||
133 | #undef STRICT_MM_TYPECHECKS | |
134 | ||
135 | #ifdef STRICT_MM_TYPECHECKS | |
136 | /* These are used to make use of C type-checking. */ | |
137 | ||
138 | /* PTE level */ | |
139 | typedef struct { pte_basic_t pte; } pte_t; | |
140 | #define pte_val(x) ((x).pte) | |
141 | #define __pte(x) ((pte_t) { (x) }) | |
142 | ||
143 | /* 64k pages additionally define a bigger "real PTE" type that gathers | |
144 | * the "second half" part of the PTE for pseudo 64k pages | |
145 | */ | |
146 | #ifdef CONFIG_PPC_64K_PAGES | |
147 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; | |
148 | #else | |
149 | typedef struct { pte_t pte; } real_pte_t; | |
150 | #endif | |
151 | ||
152 | /* PMD level */ | |
d1953c88 | 153 | #ifdef CONFIG_PPC64 |
5cd16ee9 ME |
154 | typedef struct { unsigned long pmd; } pmd_t; |
155 | #define pmd_val(x) ((x).pmd) | |
156 | #define __pmd(x) ((pmd_t) { (x) }) | |
157 | ||
158 | /* PUD level exusts only on 4k pages */ | |
d1953c88 | 159 | #ifndef CONFIG_PPC_64K_PAGES |
5cd16ee9 ME |
160 | typedef struct { unsigned long pud; } pud_t; |
161 | #define pud_val(x) ((x).pud) | |
162 | #define __pud(x) ((pud_t) { (x) }) | |
d1953c88 DG |
163 | #endif /* !CONFIG_PPC_64K_PAGES */ |
164 | #endif /* CONFIG_PPC64 */ | |
5cd16ee9 ME |
165 | |
166 | /* PGD level */ | |
167 | typedef struct { unsigned long pgd; } pgd_t; | |
168 | #define pgd_val(x) ((x).pgd) | |
169 | #define __pgd(x) ((pgd_t) { (x) }) | |
170 | ||
171 | /* Page protection bits */ | |
172 | typedef struct { unsigned long pgprot; } pgprot_t; | |
173 | #define pgprot_val(x) ((x).pgprot) | |
174 | #define __pgprot(x) ((pgprot_t) { (x) }) | |
175 | ||
176 | #else | |
177 | ||
178 | /* | |
179 | * .. while these make it easier on the compiler | |
180 | */ | |
181 | ||
182 | typedef pte_basic_t pte_t; | |
183 | #define pte_val(x) (x) | |
184 | #define __pte(x) (x) | |
185 | ||
186 | #ifdef CONFIG_PPC_64K_PAGES | |
187 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; | |
188 | #else | |
189 | typedef unsigned long real_pte_t; | |
190 | #endif | |
191 | ||
192 | ||
d1953c88 | 193 | #ifdef CONFIG_PPC64 |
5cd16ee9 ME |
194 | typedef unsigned long pmd_t; |
195 | #define pmd_val(x) (x) | |
196 | #define __pmd(x) (x) | |
197 | ||
d1953c88 | 198 | #ifndef CONFIG_PPC_64K_PAGES |
5cd16ee9 ME |
199 | typedef unsigned long pud_t; |
200 | #define pud_val(x) (x) | |
201 | #define __pud(x) (x) | |
d1953c88 DG |
202 | #endif /* !CONFIG_PPC_64K_PAGES */ |
203 | #endif /* CONFIG_PPC64 */ | |
5cd16ee9 ME |
204 | |
205 | typedef unsigned long pgd_t; | |
206 | #define pgd_val(x) (x) | |
207 | #define pgprot_val(x) (x) | |
208 | ||
209 | typedef unsigned long pgprot_t; | |
210 | #define __pgd(x) (x) | |
211 | #define __pgprot(x) (x) | |
212 | ||
213 | #endif | |
214 | ||
215 | struct page; | |
216 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); | |
217 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, | |
218 | struct page *p); | |
219 | extern int page_is_ram(unsigned long pfn); | |
220 | ||
a5bba930 | 221 | struct vm_area_struct; |
a5bba930 | 222 | |
2f569afd MS |
223 | typedef struct page *pgtable_t; |
224 | ||
659e3505 | 225 | #include <asm-generic/memory_model.h> |
5cd16ee9 ME |
226 | #endif /* __ASSEMBLY__ */ |
227 | ||
5cd16ee9 | 228 | #endif /* _ASM_POWERPC_PAGE_H */ |