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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 | ||
41151e77 BB |
39 | #ifndef __ASSEMBLY__ |
40 | #ifdef CONFIG_HUGETLB_PAGE | |
41 | extern unsigned int HPAGE_SHIFT; | |
42 | #else | |
43 | #define HPAGE_SHIFT PAGE_SHIFT | |
44 | #endif | |
45 | #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) | |
46 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) | |
47 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
48 | #define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1) | |
49 | #endif | |
50 | ||
5cd16ee9 ME |
51 | /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ |
52 | #define __HAVE_ARCH_GATE_AREA 1 | |
53 | ||
54 | /* | |
55 | * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we | |
56 | * assign PAGE_MASK to a larger type it gets extended the way we want | |
57 | * (i.e. with 1s in the high bits) | |
58 | */ | |
59 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
60 | ||
b5666f70 ME |
61 | /* |
62 | * KERNELBASE is the virtual address of the start of the kernel, it's often | |
63 | * the same as PAGE_OFFSET, but _might not be_. | |
64 | * | |
65 | * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. | |
66 | * | |
37dd2bad KG |
67 | * PAGE_OFFSET is the virtual address of the start of lowmem. |
68 | * | |
69 | * PHYSICAL_START is the physical address of the start of the kernel. | |
70 | * | |
71 | * MEMORY_START is the physical address of the start of lowmem. | |
72 | * | |
73 | * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on | |
74 | * ppc32 and based on how they are set we determine MEMORY_START. | |
75 | * | |
76 | * For the linear mapping the following equation should be true: | |
77 | * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START | |
78 | * | |
79 | * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START | |
80 | * | |
b8394179 | 81 | * There are two ways to determine a physical address from a virtual one: |
37dd2bad KG |
82 | * va = pa + PAGE_OFFSET - MEMORY_START |
83 | * va = pa + KERNELBASE - PHYSICAL_START | |
b5666f70 ME |
84 | * |
85 | * If you want to know something's offset from the start of the kernel you | |
86 | * should subtract KERNELBASE. | |
87 | * | |
88 | * If you want to test if something's a kernel address, use is_kernel_addr(). | |
89 | */ | |
398ab1fc | 90 | |
37dd2bad KG |
91 | #define KERNELBASE ASM_CONST(CONFIG_KERNEL_START) |
92 | #define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET) | |
93 | #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START)) | |
94 | ||
0f890c8d | 95 | #if defined(CONFIG_NONSTATIC_KERNEL) |
37dd2bad | 96 | #ifndef __ASSEMBLY__ |
a3ba68f9 | 97 | |
37dd2bad KG |
98 | extern phys_addr_t memstart_addr; |
99 | extern phys_addr_t kernstart_addr; | |
368ff8f1 SP |
100 | |
101 | #ifdef CONFIG_RELOCATABLE_PPC32 | |
102 | extern long long virt_phys_offset; | |
37dd2bad | 103 | #endif |
368ff8f1 SP |
104 | |
105 | #endif /* __ASSEMBLY__ */ | |
37dd2bad | 106 | #define PHYSICAL_START kernstart_addr |
368ff8f1 SP |
107 | |
108 | #else /* !CONFIG_NONSTATIC_KERNEL */ | |
37dd2bad | 109 | #define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START) |
549e8152 PM |
110 | #endif |
111 | ||
368ff8f1 SP |
112 | /* See Description below for VIRT_PHYS_OFFSET */ |
113 | #ifdef CONFIG_RELOCATABLE_PPC32 | |
114 | #define VIRT_PHYS_OFFSET virt_phys_offset | |
115 | #else | |
116 | #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START) | |
117 | #endif | |
118 | ||
119 | ||
549e8152 PM |
120 | #ifdef CONFIG_PPC64 |
121 | #define MEMORY_START 0UL | |
0f890c8d | 122 | #elif defined(CONFIG_NONSTATIC_KERNEL) |
549e8152 PM |
123 | #define MEMORY_START memstart_addr |
124 | #else | |
37dd2bad KG |
125 | #define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE) |
126 | #endif | |
5cd16ee9 | 127 | |
5cd16ee9 | 128 | #ifdef CONFIG_FLATMEM |
67eb5494 | 129 | #define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT)) |
81c386cc | 130 | #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) |
5cd16ee9 ME |
131 | #endif |
132 | ||
133 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
134 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
135 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
136 | ||
dbc9632a KG |
137 | /* |
138 | * On Book-E parts we need __va to parse the device tree and we can't | |
139 | * determine MEMORY_START until then. However we can determine PHYSICAL_START | |
140 | * from information at hand (program counter, TLB lookup). | |
141 | * | |
368ff8f1 SP |
142 | * On BookE with RELOCATABLE (RELOCATABLE_PPC32) |
143 | * | |
144 | * With RELOCATABLE_PPC32, we support loading the kernel at any physical | |
145 | * address without any restriction on the page alignment. | |
146 | * | |
147 | * We find the runtime address of _stext and relocate ourselves based on | |
148 | * the following calculation: | |
149 | * | |
150 | * virtual_base = ALIGN_DOWN(KERNELBASE,256M) + | |
151 | * MODULO(_stext.run,256M) | |
152 | * and create the following mapping: | |
153 | * | |
154 | * ALIGN_DOWN(_stext.run,256M) => ALIGN_DOWN(KERNELBASE,256M) | |
155 | * | |
156 | * When we process relocations, we cannot depend on the | |
157 | * existing equation for the __va()/__pa() translations: | |
158 | * | |
159 | * __va(x) = (x) - PHYSICAL_START + KERNELBASE | |
160 | * | |
161 | * Where: | |
162 | * PHYSICAL_START = kernstart_addr = Physical address of _stext | |
163 | * KERNELBASE = Compiled virtual address of _stext. | |
164 | * | |
165 | * This formula holds true iff, kernel load address is TLB page aligned. | |
166 | * | |
167 | * In our case, we need to also account for the shift in the kernel Virtual | |
168 | * address. | |
169 | * | |
170 | * E.g., | |
171 | * | |
172 | * Let the kernel be loaded at 64MB and KERNELBASE be 0xc0000000 (same as PAGE_OFFSET). | |
173 | * In this case, we would be mapping 0 to 0xc0000000, and kernstart_addr = 64M | |
174 | * | |
175 | * Now __va(1MB) = (0x100000) - (0x4000000) + 0xc0000000 | |
176 | * = 0xbc100000 , which is wrong. | |
177 | * | |
178 | * Rather, it should be : 0xc0000000 + 0x100000 = 0xc0100000 | |
179 | * according to our mapping. | |
180 | * | |
181 | * Hence we use the following formula to get the translations right: | |
182 | * | |
183 | * __va(x) = (x) - [ PHYSICAL_START - Effective KERNELBASE ] | |
184 | * | |
185 | * Where : | |
186 | * PHYSICAL_START = dynamic load address.(kernstart_addr variable) | |
187 | * Effective KERNELBASE = virtual_base = | |
188 | * = ALIGN_DOWN(KERNELBASE,256M) + | |
189 | * MODULO(PHYSICAL_START,256M) | |
190 | * | |
191 | * To make the cost of __va() / __pa() more light weight, we introduce | |
192 | * a new variable virt_phys_offset, which will hold : | |
193 | * | |
194 | * virt_phys_offset = Effective KERNELBASE - PHYSICAL_START | |
195 | * = ALIGN_DOWN(KERNELBASE,256M) - | |
196 | * ALIGN_DOWN(PHYSICALSTART,256M) | |
197 | * | |
198 | * Hence : | |
199 | * | |
200 | * __va(x) = x - PHYSICAL_START + Effective KERNELBASE | |
201 | * = x + virt_phys_offset | |
202 | * | |
203 | * and | |
204 | * __pa(x) = x + PHYSICAL_START - Effective KERNELBASE | |
205 | * = x - virt_phys_offset | |
206 | * | |
dbc9632a KG |
207 | * On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use |
208 | * the other definitions for __va & __pa. | |
209 | */ | |
210 | #ifdef CONFIG_BOOKE | |
368ff8f1 SP |
211 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET)) |
212 | #define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET) | |
dbc9632a | 213 | #else |
bdbc29c1 PM |
214 | #ifdef CONFIG_PPC64 |
215 | /* | |
216 | * gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET | |
217 | * with -mcmodel=medium, so we use & and | instead of - and + on 64-bit. | |
218 | */ | |
219 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) | PAGE_OFFSET)) | |
220 | #define __pa(x) ((unsigned long)(x) & 0x0fffffffffffffffUL) | |
221 | ||
222 | #else /* 32-bit, non book E */ | |
dbc9632a | 223 | #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START)) |
549e8152 | 224 | #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START) |
dbc9632a | 225 | #endif |
bdbc29c1 | 226 | #endif |
5cd16ee9 ME |
227 | |
228 | /* | |
229 | * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, | |
230 | * and needs to be executable. This means the whole heap ends | |
231 | * up being executable. | |
232 | */ | |
233 | #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ | |
234 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
235 | ||
236 | #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ | |
237 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
238 | ||
239 | #ifdef __powerpc64__ | |
240 | #include <asm/page_64.h> | |
241 | #else | |
242 | #include <asm/page_32.h> | |
243 | #endif | |
244 | ||
245 | /* align addr on a size boundary - adjust address up/down if needed */ | |
246 | #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1))) | |
247 | #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1))) | |
248 | ||
249 | /* align addr on a size boundary - adjust address up if needed */ | |
250 | #define _ALIGN(addr,size) _ALIGN_UP(addr,size) | |
251 | ||
51fae6de ME |
252 | /* |
253 | * Don't compare things with KERNELBASE or PAGE_OFFSET to test for | |
254 | * "kernelness", use is_kernel_addr() - it should do what you want. | |
255 | */ | |
57e2a99f BH |
256 | #ifdef CONFIG_PPC_BOOK3E_64 |
257 | #define is_kernel_addr(x) ((x) >= 0x8000000000000000ul) | |
258 | #else | |
51fae6de | 259 | #define is_kernel_addr(x) ((x) >= PAGE_OFFSET) |
57e2a99f | 260 | #endif |
51fae6de | 261 | |
cf9427b8 | 262 | #ifndef CONFIG_PPC_BOOK3S_64 |
41151e77 BB |
263 | /* |
264 | * Use the top bit of the higher-level page table entries to indicate whether | |
265 | * the entries we point to contain hugepages. This works because we know that | |
266 | * the page tables live in kernel space. If we ever decide to support having | |
267 | * page tables at arbitrary addresses, this breaks and will have to change. | |
268 | */ | |
269 | #ifdef CONFIG_PPC64 | |
270 | #define PD_HUGE 0x8000000000000000 | |
271 | #else | |
272 | #define PD_HUGE 0x80000000 | |
273 | #endif | |
cf9427b8 | 274 | #endif /* CONFIG_PPC_BOOK3S_64 */ |
41151e77 BB |
275 | |
276 | /* | |
277 | * Some number of bits at the level of the page table that points to | |
278 | * a hugepte are used to encode the size. This masks those bits. | |
279 | */ | |
280 | #define HUGEPD_SHIFT_MASK 0x3f | |
281 | ||
5cd16ee9 ME |
282 | #ifndef __ASSEMBLY__ |
283 | ||
284 | #undef STRICT_MM_TYPECHECKS | |
285 | ||
286 | #ifdef STRICT_MM_TYPECHECKS | |
287 | /* These are used to make use of C type-checking. */ | |
288 | ||
289 | /* PTE level */ | |
290 | typedef struct { pte_basic_t pte; } pte_t; | |
291 | #define pte_val(x) ((x).pte) | |
292 | #define __pte(x) ((pte_t) { (x) }) | |
293 | ||
294 | /* 64k pages additionally define a bigger "real PTE" type that gathers | |
295 | * the "second half" part of the PTE for pseudo 64k pages | |
296 | */ | |
ca9153a3 | 297 | #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64) |
5cd16ee9 ME |
298 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; |
299 | #else | |
300 | typedef struct { pte_t pte; } real_pte_t; | |
301 | #endif | |
302 | ||
303 | /* PMD level */ | |
d1953c88 | 304 | #ifdef CONFIG_PPC64 |
5cd16ee9 ME |
305 | typedef struct { unsigned long pmd; } pmd_t; |
306 | #define pmd_val(x) ((x).pmd) | |
307 | #define __pmd(x) ((pmd_t) { (x) }) | |
308 | ||
309 | /* PUD level exusts only on 4k pages */ | |
d1953c88 | 310 | #ifndef CONFIG_PPC_64K_PAGES |
5cd16ee9 ME |
311 | typedef struct { unsigned long pud; } pud_t; |
312 | #define pud_val(x) ((x).pud) | |
313 | #define __pud(x) ((pud_t) { (x) }) | |
d1953c88 DG |
314 | #endif /* !CONFIG_PPC_64K_PAGES */ |
315 | #endif /* CONFIG_PPC64 */ | |
5cd16ee9 ME |
316 | |
317 | /* PGD level */ | |
318 | typedef struct { unsigned long pgd; } pgd_t; | |
319 | #define pgd_val(x) ((x).pgd) | |
320 | #define __pgd(x) ((pgd_t) { (x) }) | |
321 | ||
322 | /* Page protection bits */ | |
323 | typedef struct { unsigned long pgprot; } pgprot_t; | |
324 | #define pgprot_val(x) ((x).pgprot) | |
325 | #define __pgprot(x) ((pgprot_t) { (x) }) | |
326 | ||
327 | #else | |
328 | ||
329 | /* | |
330 | * .. while these make it easier on the compiler | |
331 | */ | |
332 | ||
333 | typedef pte_basic_t pte_t; | |
334 | #define pte_val(x) (x) | |
335 | #define __pte(x) (x) | |
336 | ||
ca9153a3 | 337 | #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64) |
5cd16ee9 ME |
338 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; |
339 | #else | |
ca9153a3 | 340 | typedef pte_t real_pte_t; |
5cd16ee9 ME |
341 | #endif |
342 | ||
343 | ||
d1953c88 | 344 | #ifdef CONFIG_PPC64 |
5cd16ee9 ME |
345 | typedef unsigned long pmd_t; |
346 | #define pmd_val(x) (x) | |
347 | #define __pmd(x) (x) | |
348 | ||
d1953c88 | 349 | #ifndef CONFIG_PPC_64K_PAGES |
5cd16ee9 ME |
350 | typedef unsigned long pud_t; |
351 | #define pud_val(x) (x) | |
352 | #define __pud(x) (x) | |
d1953c88 DG |
353 | #endif /* !CONFIG_PPC_64K_PAGES */ |
354 | #endif /* CONFIG_PPC64 */ | |
5cd16ee9 ME |
355 | |
356 | typedef unsigned long pgd_t; | |
357 | #define pgd_val(x) (x) | |
358 | #define pgprot_val(x) (x) | |
359 | ||
360 | typedef unsigned long pgprot_t; | |
361 | #define __pgd(x) (x) | |
362 | #define __pgprot(x) (x) | |
363 | ||
364 | #endif | |
365 | ||
a4fe3ce7 | 366 | typedef struct { signed long pd; } hugepd_t; |
a4fe3ce7 DG |
367 | |
368 | #ifdef CONFIG_HUGETLB_PAGE | |
cf9427b8 AK |
369 | #ifdef CONFIG_PPC_BOOK3S_64 |
370 | static inline int hugepd_ok(hugepd_t hpd) | |
371 | { | |
372 | /* | |
373 | * hugepd pointer, bottom two bits == 00 and next 4 bits | |
374 | * indicate size of table | |
375 | */ | |
376 | return (((hpd.pd & 0x3) == 0x0) && ((hpd.pd & HUGEPD_SHIFT_MASK) != 0)); | |
377 | } | |
378 | #else | |
a4fe3ce7 DG |
379 | static inline int hugepd_ok(hugepd_t hpd) |
380 | { | |
381 | return (hpd.pd > 0); | |
382 | } | |
cf9427b8 | 383 | #endif |
a4fe3ce7 DG |
384 | |
385 | #define is_hugepd(pdep) (hugepd_ok(*((hugepd_t *)(pdep)))) | |
e2b3d202 | 386 | int pgd_huge(pgd_t pgd); |
a4fe3ce7 DG |
387 | #else /* CONFIG_HUGETLB_PAGE */ |
388 | #define is_hugepd(pdep) 0 | |
e2b3d202 | 389 | #define pgd_huge(pgd) 0 |
a4fe3ce7 DG |
390 | #endif /* CONFIG_HUGETLB_PAGE */ |
391 | ||
5cd16ee9 ME |
392 | struct page; |
393 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); | |
394 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, | |
395 | struct page *p); | |
396 | extern int page_is_ram(unsigned long pfn); | |
1d54cf2b | 397 | extern int devmem_is_allowed(unsigned long pfn); |
5cd16ee9 | 398 | |
14f966e7 RJ |
399 | #ifdef CONFIG_PPC_SMLPAR |
400 | void arch_free_page(struct page *page, int order); | |
401 | #define HAVE_ARCH_FREE_PAGE | |
402 | #endif | |
403 | ||
a5bba930 | 404 | struct vm_area_struct; |
a5bba930 | 405 | |
ecb35c39 | 406 | #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC64) |
5c1f6ee9 AK |
407 | typedef pte_t *pgtable_t; |
408 | #else | |
2f569afd | 409 | typedef struct page *pgtable_t; |
5c1f6ee9 | 410 | #endif |
2f569afd | 411 | |
659e3505 | 412 | #include <asm-generic/memory_model.h> |
5cd16ee9 ME |
413 | #endif /* __ASSEMBLY__ */ |
414 | ||
5cd16ee9 | 415 | #endif /* _ASM_POWERPC_PAGE_H */ |