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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> | |
f78f7ed7 | 15 | #include <linux/kernel.h> |
463baa8a SR |
16 | #else |
17 | #include <asm/types.h> | |
a3ba68f9 | 18 | #endif |
ec0c464c | 19 | #include <asm/asm-const.h> |
5cd16ee9 ME |
20 | |
21 | /* | |
e1240122 | 22 | * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages |
555f4fdb | 23 | * on PPC44x and 4K/16K on 8xx). 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 | */ | |
555f4fdb | 27 | #define PAGE_SHIFT CONFIG_PPC_PAGE_SHIFT |
5cd16ee9 ME |
28 | #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) |
29 | ||
41151e77 BB |
30 | #ifndef __ASSEMBLY__ |
31 | #ifdef CONFIG_HUGETLB_PAGE | |
85975387 | 32 | extern bool hugetlb_disabled; |
41151e77 BB |
33 | extern unsigned int HPAGE_SHIFT; |
34 | #else | |
35 | #define HPAGE_SHIFT PAGE_SHIFT | |
36 | #endif | |
37 | #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) | |
38 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) | |
39 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
40 | #define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1) | |
41 | #endif | |
42 | ||
5cd16ee9 ME |
43 | /* |
44 | * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we | |
45 | * assign PAGE_MASK to a larger type it gets extended the way we want | |
46 | * (i.e. with 1s in the high bits) | |
47 | */ | |
48 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
49 | ||
b5666f70 ME |
50 | /* |
51 | * KERNELBASE is the virtual address of the start of the kernel, it's often | |
52 | * the same as PAGE_OFFSET, but _might not be_. | |
53 | * | |
54 | * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. | |
55 | * | |
37dd2bad KG |
56 | * PAGE_OFFSET is the virtual address of the start of lowmem. |
57 | * | |
58 | * PHYSICAL_START is the physical address of the start of the kernel. | |
59 | * | |
60 | * MEMORY_START is the physical address of the start of lowmem. | |
61 | * | |
62 | * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on | |
63 | * ppc32 and based on how they are set we determine MEMORY_START. | |
64 | * | |
65 | * For the linear mapping the following equation should be true: | |
66 | * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START | |
67 | * | |
68 | * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START | |
69 | * | |
b8394179 | 70 | * There are two ways to determine a physical address from a virtual one: |
37dd2bad KG |
71 | * va = pa + PAGE_OFFSET - MEMORY_START |
72 | * va = pa + KERNELBASE - PHYSICAL_START | |
b5666f70 ME |
73 | * |
74 | * If you want to know something's offset from the start of the kernel you | |
75 | * should subtract KERNELBASE. | |
76 | * | |
77 | * If you want to test if something's a kernel address, use is_kernel_addr(). | |
78 | */ | |
398ab1fc | 79 | |
37dd2bad KG |
80 | #define KERNELBASE ASM_CONST(CONFIG_KERNEL_START) |
81 | #define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET) | |
82 | #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START)) | |
83 | ||
0f890c8d | 84 | #if defined(CONFIG_NONSTATIC_KERNEL) |
37dd2bad | 85 | #ifndef __ASSEMBLY__ |
a3ba68f9 | 86 | |
37dd2bad KG |
87 | extern phys_addr_t memstart_addr; |
88 | extern phys_addr_t kernstart_addr; | |
368ff8f1 | 89 | |
27d11496 | 90 | #if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC32) |
368ff8f1 | 91 | extern long long virt_phys_offset; |
37dd2bad | 92 | #endif |
368ff8f1 SP |
93 | |
94 | #endif /* __ASSEMBLY__ */ | |
37dd2bad | 95 | #define PHYSICAL_START kernstart_addr |
368ff8f1 SP |
96 | |
97 | #else /* !CONFIG_NONSTATIC_KERNEL */ | |
37dd2bad | 98 | #define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START) |
549e8152 PM |
99 | #endif |
100 | ||
368ff8f1 | 101 | /* See Description below for VIRT_PHYS_OFFSET */ |
ffda09a9 SW |
102 | #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE) |
103 | #ifdef CONFIG_RELOCATABLE | |
368ff8f1 SP |
104 | #define VIRT_PHYS_OFFSET virt_phys_offset |
105 | #else | |
106 | #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START) | |
107 | #endif | |
ffda09a9 | 108 | #endif |
368ff8f1 | 109 | |
549e8152 PM |
110 | #ifdef CONFIG_PPC64 |
111 | #define MEMORY_START 0UL | |
0f890c8d | 112 | #elif defined(CONFIG_NONSTATIC_KERNEL) |
549e8152 PM |
113 | #define MEMORY_START memstart_addr |
114 | #else | |
37dd2bad KG |
115 | #define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE) |
116 | #endif | |
5cd16ee9 | 117 | |
5cd16ee9 | 118 | #ifdef CONFIG_FLATMEM |
67eb5494 | 119 | #define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT)) |
603b8922 MM |
120 | #ifndef __ASSEMBLY__ |
121 | extern unsigned long max_mapnr; | |
122 | static inline bool pfn_valid(unsigned long pfn) | |
123 | { | |
124 | unsigned long min_pfn = ARCH_PFN_OFFSET; | |
125 | ||
126 | return pfn >= min_pfn && pfn < max_mapnr; | |
127 | } | |
128 | #endif | |
5cd16ee9 ME |
129 | #endif |
130 | ||
65d3223a AK |
131 | #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) |
132 | #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) | |
5cd16ee9 | 133 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
e41e53cd ME |
134 | |
135 | #ifdef CONFIG_PPC_BOOK3S_64 | |
136 | /* | |
137 | * On hash the vmalloc and other regions alias to the kernel region when passed | |
138 | * through __pa(), which virt_to_pfn() uses. That means virt_addr_valid() can | |
139 | * return true for some vmalloc addresses, which is incorrect. So explicitly | |
140 | * check that the address is in the kernel region. | |
141 | */ | |
142 | #define virt_addr_valid(kaddr) (REGION_ID(kaddr) == KERNEL_REGION_ID && \ | |
143 | pfn_valid(virt_to_pfn(kaddr))) | |
144 | #else | |
65d3223a | 145 | #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr)) |
e41e53cd | 146 | #endif |
5cd16ee9 | 147 | |
dbc9632a KG |
148 | /* |
149 | * On Book-E parts we need __va to parse the device tree and we can't | |
150 | * determine MEMORY_START until then. However we can determine PHYSICAL_START | |
151 | * from information at hand (program counter, TLB lookup). | |
152 | * | |
27d11496 | 153 | * On BookE with RELOCATABLE && PPC32 |
368ff8f1 | 154 | * |
27d11496 | 155 | * With RELOCATABLE && PPC32, we support loading the kernel at any physical |
368ff8f1 SP |
156 | * address without any restriction on the page alignment. |
157 | * | |
158 | * We find the runtime address of _stext and relocate ourselves based on | |
159 | * the following calculation: | |
160 | * | |
161 | * virtual_base = ALIGN_DOWN(KERNELBASE,256M) + | |
162 | * MODULO(_stext.run,256M) | |
163 | * and create the following mapping: | |
164 | * | |
165 | * ALIGN_DOWN(_stext.run,256M) => ALIGN_DOWN(KERNELBASE,256M) | |
166 | * | |
167 | * When we process relocations, we cannot depend on the | |
168 | * existing equation for the __va()/__pa() translations: | |
169 | * | |
170 | * __va(x) = (x) - PHYSICAL_START + KERNELBASE | |
171 | * | |
172 | * Where: | |
173 | * PHYSICAL_START = kernstart_addr = Physical address of _stext | |
174 | * KERNELBASE = Compiled virtual address of _stext. | |
175 | * | |
176 | * This formula holds true iff, kernel load address is TLB page aligned. | |
177 | * | |
178 | * In our case, we need to also account for the shift in the kernel Virtual | |
179 | * address. | |
180 | * | |
181 | * E.g., | |
182 | * | |
183 | * Let the kernel be loaded at 64MB and KERNELBASE be 0xc0000000 (same as PAGE_OFFSET). | |
184 | * In this case, we would be mapping 0 to 0xc0000000, and kernstart_addr = 64M | |
185 | * | |
186 | * Now __va(1MB) = (0x100000) - (0x4000000) + 0xc0000000 | |
187 | * = 0xbc100000 , which is wrong. | |
188 | * | |
189 | * Rather, it should be : 0xc0000000 + 0x100000 = 0xc0100000 | |
190 | * according to our mapping. | |
191 | * | |
192 | * Hence we use the following formula to get the translations right: | |
193 | * | |
194 | * __va(x) = (x) - [ PHYSICAL_START - Effective KERNELBASE ] | |
195 | * | |
196 | * Where : | |
197 | * PHYSICAL_START = dynamic load address.(kernstart_addr variable) | |
198 | * Effective KERNELBASE = virtual_base = | |
199 | * = ALIGN_DOWN(KERNELBASE,256M) + | |
200 | * MODULO(PHYSICAL_START,256M) | |
201 | * | |
202 | * To make the cost of __va() / __pa() more light weight, we introduce | |
203 | * a new variable virt_phys_offset, which will hold : | |
204 | * | |
205 | * virt_phys_offset = Effective KERNELBASE - PHYSICAL_START | |
206 | * = ALIGN_DOWN(KERNELBASE,256M) - | |
207 | * ALIGN_DOWN(PHYSICALSTART,256M) | |
208 | * | |
209 | * Hence : | |
210 | * | |
211 | * __va(x) = x - PHYSICAL_START + Effective KERNELBASE | |
212 | * = x + virt_phys_offset | |
213 | * | |
214 | * and | |
215 | * __pa(x) = x + PHYSICAL_START - Effective KERNELBASE | |
216 | * = x - virt_phys_offset | |
217 | * | |
dbc9632a KG |
218 | * On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use |
219 | * the other definitions for __va & __pa. | |
220 | */ | |
ffda09a9 | 221 | #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE) |
368ff8f1 SP |
222 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET)) |
223 | #define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET) | |
dbc9632a | 224 | #else |
bdbc29c1 PM |
225 | #ifdef CONFIG_PPC64 |
226 | /* | |
227 | * gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET | |
228 | * with -mcmodel=medium, so we use & and | instead of - and + on 64-bit. | |
229 | */ | |
230 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) | PAGE_OFFSET)) | |
231 | #define __pa(x) ((unsigned long)(x) & 0x0fffffffffffffffUL) | |
232 | ||
233 | #else /* 32-bit, non book E */ | |
dbc9632a | 234 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START)) |
549e8152 | 235 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START) |
dbc9632a | 236 | #endif |
bdbc29c1 | 237 | #endif |
5cd16ee9 ME |
238 | |
239 | /* | |
240 | * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, | |
241 | * and needs to be executable. This means the whole heap ends | |
242 | * up being executable. | |
243 | */ | |
16e72e9b DV |
244 | #define VM_DATA_DEFAULT_FLAGS32 \ |
245 | (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ | |
246 | VM_READ | VM_WRITE | \ | |
5cd16ee9 ME |
247 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) |
248 | ||
249 | #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ | |
250 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
251 | ||
252 | #ifdef __powerpc64__ | |
253 | #include <asm/page_64.h> | |
254 | #else | |
255 | #include <asm/page_32.h> | |
256 | #endif | |
257 | ||
258 | /* align addr on a size boundary - adjust address up/down if needed */ | |
f78f7ed7 AK |
259 | #define _ALIGN_UP(addr, size) __ALIGN_KERNEL(addr, size) |
260 | #define _ALIGN_DOWN(addr, size) ((addr)&(~((typeof(addr))(size)-1))) | |
5cd16ee9 ME |
261 | |
262 | /* align addr on a size boundary - adjust address up if needed */ | |
263 | #define _ALIGN(addr,size) _ALIGN_UP(addr,size) | |
264 | ||
51fae6de ME |
265 | /* |
266 | * Don't compare things with KERNELBASE or PAGE_OFFSET to test for | |
267 | * "kernelness", use is_kernel_addr() - it should do what you want. | |
268 | */ | |
57e2a99f BH |
269 | #ifdef CONFIG_PPC_BOOK3E_64 |
270 | #define is_kernel_addr(x) ((x) >= 0x8000000000000000ul) | |
271 | #else | |
51fae6de | 272 | #define is_kernel_addr(x) ((x) >= PAGE_OFFSET) |
57e2a99f | 273 | #endif |
51fae6de | 274 | |
cf9427b8 | 275 | #ifndef CONFIG_PPC_BOOK3S_64 |
41151e77 BB |
276 | /* |
277 | * Use the top bit of the higher-level page table entries to indicate whether | |
278 | * the entries we point to contain hugepages. This works because we know that | |
279 | * the page tables live in kernel space. If we ever decide to support having | |
280 | * page tables at arbitrary addresses, this breaks and will have to change. | |
281 | */ | |
282 | #ifdef CONFIG_PPC64 | |
d456f352 | 283 | #define PD_HUGE 0x8000000000000000UL |
41151e77 BB |
284 | #else |
285 | #define PD_HUGE 0x80000000 | |
286 | #endif | |
c61a8843 PM |
287 | |
288 | #else /* CONFIG_PPC_BOOK3S_64 */ | |
289 | /* | |
290 | * Book3S 64 stores real addresses in the hugepd entries to | |
291 | * avoid overlaps with _PAGE_PRESENT and _PAGE_PTE. | |
292 | */ | |
293 | #define HUGEPD_ADDR_MASK (0x0ffffffffffffffful & ~HUGEPD_SHIFT_MASK) | |
cf9427b8 | 294 | #endif /* CONFIG_PPC_BOOK3S_64 */ |
41151e77 BB |
295 | |
296 | /* | |
297 | * Some number of bits at the level of the page table that points to | |
298 | * a hugepte are used to encode the size. This masks those bits. | |
299 | */ | |
300 | #define HUGEPD_SHIFT_MASK 0x3f | |
301 | ||
5cd16ee9 ME |
302 | #ifndef __ASSEMBLY__ |
303 | ||
5dc1ef85 AK |
304 | #ifdef CONFIG_PPC_BOOK3S_64 |
305 | #include <asm/pgtable-be-types.h> | |
306 | #else | |
2bf59916 | 307 | #include <asm/pgtable-types.h> |
5dc1ef85 | 308 | #endif |
5cd16ee9 | 309 | |
a4fe3ce7 | 310 | |
26a344ae AK |
311 | #ifndef CONFIG_HUGETLB_PAGE |
312 | #define is_hugepd(pdep) (0) | |
313 | #define pgd_huge(pgd) (0) | |
a4fe3ce7 | 314 | #endif /* CONFIG_HUGETLB_PAGE */ |
26a344ae | 315 | |
5cd16ee9 ME |
316 | struct page; |
317 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); | |
318 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, | |
319 | struct page *p); | |
1d54cf2b | 320 | extern int devmem_is_allowed(unsigned long pfn); |
5cd16ee9 | 321 | |
14f966e7 RJ |
322 | #ifdef CONFIG_PPC_SMLPAR |
323 | void arch_free_page(struct page *page, int order); | |
324 | #define HAVE_ARCH_FREE_PAGE | |
325 | #endif | |
326 | ||
a5bba930 | 327 | struct vm_area_struct; |
2f569afd | 328 | |
659e3505 | 329 | #include <asm-generic/memory_model.h> |
5cd16ee9 | 330 | #endif /* __ASSEMBLY__ */ |
a3286f05 | 331 | #include <asm/slice.h> |
5cd16ee9 | 332 | |
25078dc1 CH |
333 | #define ARCH_ZONE_DMA_BITS 31 |
334 | ||
5cd16ee9 | 335 | #endif /* _ASM_POWERPC_PAGE_H */ |