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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 | ||
a3ba68f9 KG |
13 | #ifndef __ASSEMBLY__ |
14 | #include <linux/types.h> | |
463baa8a SR |
15 | #else |
16 | #include <asm/types.h> | |
a3ba68f9 | 17 | #endif |
5cd16ee9 | 18 | #include <asm/asm-compat.h> |
47310413 | 19 | #include <asm/kdump.h> |
5cd16ee9 ME |
20 | |
21 | /* | |
e1240122 | 22 | * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages |
ca9153a3 | 23 | * on PPC44x). For PPC64 we support either 4K or 64K software |
5cd16ee9 ME |
24 | * page size. When using 64K pages however, whether we are really supporting |
25 | * 64K pages in HW or not is irrelevant to those definitions. | |
26 | */ | |
e1240122 YT |
27 | #if defined(CONFIG_PPC_256K_PAGES) |
28 | #define PAGE_SHIFT 18 | |
29 | #elif defined(CONFIG_PPC_64K_PAGES) | |
5cd16ee9 | 30 | #define PAGE_SHIFT 16 |
ca9153a3 IY |
31 | #elif defined(CONFIG_PPC_16K_PAGES) |
32 | #define PAGE_SHIFT 14 | |
5cd16ee9 ME |
33 | #else |
34 | #define PAGE_SHIFT 12 | |
35 | #endif | |
36 | ||
37 | #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) | |
38 | ||
39 | /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ | |
40 | #define __HAVE_ARCH_GATE_AREA 1 | |
41 | ||
42 | /* | |
43 | * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we | |
44 | * assign PAGE_MASK to a larger type it gets extended the way we want | |
45 | * (i.e. with 1s in the high bits) | |
46 | */ | |
47 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
48 | ||
b5666f70 ME |
49 | /* |
50 | * KERNELBASE is the virtual address of the start of the kernel, it's often | |
51 | * the same as PAGE_OFFSET, but _might not be_. | |
52 | * | |
53 | * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. | |
54 | * | |
37dd2bad KG |
55 | * PAGE_OFFSET is the virtual address of the start of lowmem. |
56 | * | |
57 | * PHYSICAL_START is the physical address of the start of the kernel. | |
58 | * | |
59 | * MEMORY_START is the physical address of the start of lowmem. | |
60 | * | |
61 | * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on | |
62 | * ppc32 and based on how they are set we determine MEMORY_START. | |
63 | * | |
64 | * For the linear mapping the following equation should be true: | |
65 | * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START | |
66 | * | |
67 | * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START | |
68 | * | |
69 | * There are two was to determine a physical address from a virtual one: | |
70 | * va = pa + PAGE_OFFSET - MEMORY_START | |
71 | * va = pa + KERNELBASE - PHYSICAL_START | |
b5666f70 ME |
72 | * |
73 | * If you want to know something's offset from the start of the kernel you | |
74 | * should subtract KERNELBASE. | |
75 | * | |
76 | * If you want to test if something's a kernel address, use is_kernel_addr(). | |
77 | */ | |
398ab1fc | 78 | |
37dd2bad KG |
79 | #define KERNELBASE ASM_CONST(CONFIG_KERNEL_START) |
80 | #define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET) | |
81 | #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START)) | |
82 | ||
549e8152 | 83 | #if defined(CONFIG_RELOCATABLE) |
37dd2bad | 84 | #ifndef __ASSEMBLY__ |
a3ba68f9 | 85 | |
37dd2bad KG |
86 | extern phys_addr_t memstart_addr; |
87 | extern phys_addr_t kernstart_addr; | |
88 | #endif | |
89 | #define PHYSICAL_START kernstart_addr | |
37dd2bad KG |
90 | #else |
91 | #define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START) | |
549e8152 PM |
92 | #endif |
93 | ||
94 | #ifdef CONFIG_PPC64 | |
95 | #define MEMORY_START 0UL | |
96 | #elif defined(CONFIG_RELOCATABLE) | |
97 | #define MEMORY_START memstart_addr | |
98 | #else | |
37dd2bad KG |
99 | #define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE) |
100 | #endif | |
5cd16ee9 | 101 | |
5cd16ee9 | 102 | #ifdef CONFIG_FLATMEM |
37dd2bad KG |
103 | #define ARCH_PFN_OFFSET (MEMORY_START >> PAGE_SHIFT) |
104 | #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr)) | |
5cd16ee9 ME |
105 | #endif |
106 | ||
107 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
108 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
109 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
110 | ||
549e8152 PM |
111 | #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - MEMORY_START)) |
112 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START) | |
5cd16ee9 ME |
113 | |
114 | /* | |
115 | * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, | |
116 | * and needs to be executable. This means the whole heap ends | |
117 | * up being executable. | |
118 | */ | |
119 | #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ | |
120 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
121 | ||
122 | #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ | |
123 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
124 | ||
125 | #ifdef __powerpc64__ | |
126 | #include <asm/page_64.h> | |
127 | #else | |
128 | #include <asm/page_32.h> | |
129 | #endif | |
130 | ||
131 | /* align addr on a size boundary - adjust address up/down if needed */ | |
132 | #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1))) | |
133 | #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1))) | |
134 | ||
135 | /* align addr on a size boundary - adjust address up if needed */ | |
136 | #define _ALIGN(addr,size) _ALIGN_UP(addr,size) | |
137 | ||
51fae6de ME |
138 | /* |
139 | * Don't compare things with KERNELBASE or PAGE_OFFSET to test for | |
140 | * "kernelness", use is_kernel_addr() - it should do what you want. | |
141 | */ | |
57e2a99f BH |
142 | #ifdef CONFIG_PPC_BOOK3E_64 |
143 | #define is_kernel_addr(x) ((x) >= 0x8000000000000000ul) | |
144 | #else | |
51fae6de | 145 | #define is_kernel_addr(x) ((x) >= PAGE_OFFSET) |
57e2a99f | 146 | #endif |
51fae6de | 147 | |
5cd16ee9 ME |
148 | #ifndef __ASSEMBLY__ |
149 | ||
150 | #undef STRICT_MM_TYPECHECKS | |
151 | ||
152 | #ifdef STRICT_MM_TYPECHECKS | |
153 | /* These are used to make use of C type-checking. */ | |
154 | ||
155 | /* PTE level */ | |
156 | typedef struct { pte_basic_t pte; } pte_t; | |
157 | #define pte_val(x) ((x).pte) | |
158 | #define __pte(x) ((pte_t) { (x) }) | |
159 | ||
160 | /* 64k pages additionally define a bigger "real PTE" type that gathers | |
161 | * the "second half" part of the PTE for pseudo 64k pages | |
162 | */ | |
ca9153a3 | 163 | #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64) |
5cd16ee9 ME |
164 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; |
165 | #else | |
166 | typedef struct { pte_t pte; } real_pte_t; | |
167 | #endif | |
168 | ||
169 | /* PMD level */ | |
d1953c88 | 170 | #ifdef CONFIG_PPC64 |
5cd16ee9 ME |
171 | typedef struct { unsigned long pmd; } pmd_t; |
172 | #define pmd_val(x) ((x).pmd) | |
173 | #define __pmd(x) ((pmd_t) { (x) }) | |
174 | ||
175 | /* PUD level exusts only on 4k pages */ | |
d1953c88 | 176 | #ifndef CONFIG_PPC_64K_PAGES |
5cd16ee9 ME |
177 | typedef struct { unsigned long pud; } pud_t; |
178 | #define pud_val(x) ((x).pud) | |
179 | #define __pud(x) ((pud_t) { (x) }) | |
d1953c88 DG |
180 | #endif /* !CONFIG_PPC_64K_PAGES */ |
181 | #endif /* CONFIG_PPC64 */ | |
5cd16ee9 ME |
182 | |
183 | /* PGD level */ | |
184 | typedef struct { unsigned long pgd; } pgd_t; | |
185 | #define pgd_val(x) ((x).pgd) | |
186 | #define __pgd(x) ((pgd_t) { (x) }) | |
187 | ||
188 | /* Page protection bits */ | |
189 | typedef struct { unsigned long pgprot; } pgprot_t; | |
190 | #define pgprot_val(x) ((x).pgprot) | |
191 | #define __pgprot(x) ((pgprot_t) { (x) }) | |
192 | ||
193 | #else | |
194 | ||
195 | /* | |
196 | * .. while these make it easier on the compiler | |
197 | */ | |
198 | ||
199 | typedef pte_basic_t pte_t; | |
200 | #define pte_val(x) (x) | |
201 | #define __pte(x) (x) | |
202 | ||
ca9153a3 | 203 | #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64) |
5cd16ee9 ME |
204 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; |
205 | #else | |
ca9153a3 | 206 | typedef pte_t real_pte_t; |
5cd16ee9 ME |
207 | #endif |
208 | ||
209 | ||
d1953c88 | 210 | #ifdef CONFIG_PPC64 |
5cd16ee9 ME |
211 | typedef unsigned long pmd_t; |
212 | #define pmd_val(x) (x) | |
213 | #define __pmd(x) (x) | |
214 | ||
d1953c88 | 215 | #ifndef CONFIG_PPC_64K_PAGES |
5cd16ee9 ME |
216 | typedef unsigned long pud_t; |
217 | #define pud_val(x) (x) | |
218 | #define __pud(x) (x) | |
d1953c88 DG |
219 | #endif /* !CONFIG_PPC_64K_PAGES */ |
220 | #endif /* CONFIG_PPC64 */ | |
5cd16ee9 ME |
221 | |
222 | typedef unsigned long pgd_t; | |
223 | #define pgd_val(x) (x) | |
224 | #define pgprot_val(x) (x) | |
225 | ||
226 | typedef unsigned long pgprot_t; | |
227 | #define __pgd(x) (x) | |
228 | #define __pgprot(x) (x) | |
229 | ||
230 | #endif | |
231 | ||
232 | struct page; | |
233 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); | |
234 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, | |
235 | struct page *p); | |
236 | extern int page_is_ram(unsigned long pfn); | |
237 | ||
14f966e7 RJ |
238 | #ifdef CONFIG_PPC_SMLPAR |
239 | void arch_free_page(struct page *page, int order); | |
240 | #define HAVE_ARCH_FREE_PAGE | |
241 | #endif | |
242 | ||
a5bba930 | 243 | struct vm_area_struct; |
a5bba930 | 244 | |
2f569afd MS |
245 | typedef struct page *pgtable_t; |
246 | ||
659e3505 | 247 | #include <asm-generic/memory_model.h> |
5cd16ee9 ME |
248 | #endif /* __ASSEMBLY__ */ |
249 | ||
5cd16ee9 | 250 | #endif /* _ASM_POWERPC_PAGE_H */ |