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Linux/arch/powerpc/include/asm/page.h

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  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 
 13 #ifndef __ASSEMBLY__
 14 #include <linux/types.h>
 15 #else
 16 #include <asm/types.h>
 17 #endif
 18 #include <asm/asm-compat.h>
 19 #include <asm/kdump.h>
 20 
 21 /*
 22  * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages
 23  * on PPC44x). For PPC64 we support either 4K or 64K software
 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  */
 27 #if defined(CONFIG_PPC_256K_PAGES)
 28 #define PAGE_SHIFT              18
 29 #elif defined(CONFIG_PPC_64K_PAGES)
 30 #define PAGE_SHIFT              16
 31 #elif defined(CONFIG_PPC_16K_PAGES)
 32 #define PAGE_SHIFT              14
 33 #else
 34 #define PAGE_SHIFT              12
 35 #endif
 36 
 37 #define PAGE_SIZE               (ASM_CONST(1) << PAGE_SHIFT)
 38 
 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 
 51 /*
 52  * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
 53  * assign PAGE_MASK to a larger type it gets extended the way we want
 54  * (i.e. with 1s in the high bits)
 55  */
 56 #define PAGE_MASK      (~((1 << PAGE_SHIFT) - 1))
 57 
 58 /*
 59  * KERNELBASE is the virtual address of the start of the kernel, it's often
 60  * the same as PAGE_OFFSET, but _might not be_.
 61  *
 62  * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
 63  *
 64  * PAGE_OFFSET is the virtual address of the start of lowmem.
 65  *
 66  * PHYSICAL_START is the physical address of the start of the kernel.
 67  *
 68  * MEMORY_START is the physical address of the start of lowmem.
 69  *
 70  * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
 71  * ppc32 and based on how they are set we determine MEMORY_START.
 72  *
 73  * For the linear mapping the following equation should be true:
 74  * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
 75  *
 76  * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
 77  *
 78  * There are two ways to determine a physical address from a virtual one:
 79  * va = pa + PAGE_OFFSET - MEMORY_START
 80  * va = pa + KERNELBASE - PHYSICAL_START
 81  *
 82  * If you want to know something's offset from the start of the kernel you
 83  * should subtract KERNELBASE.
 84  *
 85  * If you want to test if something's a kernel address, use is_kernel_addr().
 86  */
 87 
 88 #define KERNELBASE      ASM_CONST(CONFIG_KERNEL_START)
 89 #define PAGE_OFFSET     ASM_CONST(CONFIG_PAGE_OFFSET)
 90 #define LOAD_OFFSET     ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))
 91 
 92 #if defined(CONFIG_NONSTATIC_KERNEL)
 93 #ifndef __ASSEMBLY__
 94 
 95 extern phys_addr_t memstart_addr;
 96 extern phys_addr_t kernstart_addr;
 97 
 98 #ifdef CONFIG_RELOCATABLE_PPC32
 99 extern long long virt_phys_offset;
100 #endif
101 
102 #endif /* __ASSEMBLY__ */
103 #define PHYSICAL_START  kernstart_addr
104 
105 #else   /* !CONFIG_NONSTATIC_KERNEL */
106 #define PHYSICAL_START  ASM_CONST(CONFIG_PHYSICAL_START)
107 #endif
108 
109 /* See Description below for VIRT_PHYS_OFFSET */
110 #ifdef CONFIG_RELOCATABLE_PPC32
111 #define VIRT_PHYS_OFFSET virt_phys_offset
112 #else
113 #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START)
114 #endif
115 
116 
117 #ifdef CONFIG_PPC64
118 #define MEMORY_START    0UL
119 #elif defined(CONFIG_NONSTATIC_KERNEL)
120 #define MEMORY_START    memstart_addr
121 #else
122 #define MEMORY_START    (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
123 #endif
124 
125 #ifdef CONFIG_FLATMEM
126 #define ARCH_PFN_OFFSET         ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
127 #define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
128 #endif
129 
130 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
131 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
132 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
133 
134 /*
135  * On Book-E parts we need __va to parse the device tree and we can't
136  * determine MEMORY_START until then.  However we can determine PHYSICAL_START
137  * from information at hand (program counter, TLB lookup).
138  *
139  * On BookE with RELOCATABLE (RELOCATABLE_PPC32)
140  *
141  *   With RELOCATABLE_PPC32,  we support loading the kernel at any physical 
142  *   address without any restriction on the page alignment.
143  *
144  *   We find the runtime address of _stext and relocate ourselves based on 
145  *   the following calculation:
146  *
147  *        virtual_base = ALIGN_DOWN(KERNELBASE,256M) +
148  *                              MODULO(_stext.run,256M)
149  *   and create the following mapping:
150  *
151  *        ALIGN_DOWN(_stext.run,256M) => ALIGN_DOWN(KERNELBASE,256M)
152  *
153  *   When we process relocations, we cannot depend on the
154  *   existing equation for the __va()/__pa() translations:
155  *
156  *         __va(x) = (x)  - PHYSICAL_START + KERNELBASE
157  *
158  *   Where:
159  *       PHYSICAL_START = kernstart_addr = Physical address of _stext
160  *       KERNELBASE = Compiled virtual address of _stext.
161  *
162  *   This formula holds true iff, kernel load address is TLB page aligned.
163  *
164  *   In our case, we need to also account for the shift in the kernel Virtual 
165  *   address.
166  *
167  *   E.g.,
168  *
169  *   Let the kernel be loaded at 64MB and KERNELBASE be 0xc0000000 (same as PAGE_OFFSET).
170  *   In this case, we would be mapping 0 to 0xc0000000, and kernstart_addr = 64M
171  *
172  *   Now __va(1MB) = (0x100000) - (0x4000000) + 0xc0000000
173  *                 = 0xbc100000 , which is wrong.
174  *
175  *   Rather, it should be : 0xc0000000 + 0x100000 = 0xc0100000
176  *              according to our mapping.
177  *
178  *   Hence we use the following formula to get the translations right:
179  *
180  *        __va(x) = (x) - [ PHYSICAL_START - Effective KERNELBASE ]
181  *
182  *        Where :
183  *              PHYSICAL_START = dynamic load address.(kernstart_addr variable)
184  *              Effective KERNELBASE = virtual_base =
185  *                                   = ALIGN_DOWN(KERNELBASE,256M) +
186  *                                              MODULO(PHYSICAL_START,256M)
187  *
188  *      To make the cost of __va() / __pa() more light weight, we introduce
189  *      a new variable virt_phys_offset, which will hold :
190  *
191  *      virt_phys_offset = Effective KERNELBASE - PHYSICAL_START
192  *                       = ALIGN_DOWN(KERNELBASE,256M) - 
193  *                              ALIGN_DOWN(PHYSICALSTART,256M)
194  *
195  *      Hence :
196  *
197  *      __va(x) = x - PHYSICAL_START + Effective KERNELBASE
198  *              = x + virt_phys_offset
199  *
200  *              and
201  *      __pa(x) = x + PHYSICAL_START - Effective KERNELBASE
202  *              = x - virt_phys_offset
203  *              
204  * On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use
205  * the other definitions for __va & __pa.
206  */
207 #ifdef CONFIG_BOOKE
208 #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET))
209 #define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET)
210 #else
211 #ifdef CONFIG_PPC64
212 /*
213  * gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET
214  * with -mcmodel=medium, so we use & and | instead of - and + on 64-bit.
215  */
216 #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) | PAGE_OFFSET))
217 #define __pa(x) ((unsigned long)(x) & 0x0fffffffffffffffUL)
218 
219 #else /* 32-bit, non book E */
220 #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
221 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
222 #endif
223 #endif
224 
225 /*
226  * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
227  * and needs to be executable.  This means the whole heap ends
228  * up being executable.
229  */
230 #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
231                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
232 
233 #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
234                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
235 
236 #ifdef __powerpc64__
237 #include <asm/page_64.h>
238 #else
239 #include <asm/page_32.h>
240 #endif
241 
242 /* align addr on a size boundary - adjust address up/down if needed */
243 #define _ALIGN_UP(addr,size)    (((addr)+((size)-1))&(~((size)-1)))
244 #define _ALIGN_DOWN(addr,size)  ((addr)&(~((size)-1)))
245 
246 /* align addr on a size boundary - adjust address up if needed */
247 #define _ALIGN(addr,size)     _ALIGN_UP(addr,size)
248 
249 /*
250  * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
251  * "kernelness", use is_kernel_addr() - it should do what you want.
252  */
253 #ifdef CONFIG_PPC_BOOK3E_64
254 #define is_kernel_addr(x)       ((x) >= 0x8000000000000000ul)
255 #else
256 #define is_kernel_addr(x)       ((x) >= PAGE_OFFSET)
257 #endif
258 
259 #ifndef CONFIG_PPC_BOOK3S_64
260 /*
261  * Use the top bit of the higher-level page table entries to indicate whether
262  * the entries we point to contain hugepages.  This works because we know that
263  * the page tables live in kernel space.  If we ever decide to support having
264  * page tables at arbitrary addresses, this breaks and will have to change.
265  */
266 #ifdef CONFIG_PPC64
267 #define PD_HUGE 0x8000000000000000
268 #else
269 #define PD_HUGE 0x80000000
270 #endif
271 #endif /* CONFIG_PPC_BOOK3S_64 */
272 
273 /*
274  * Some number of bits at the level of the page table that points to
275  * a hugepte are used to encode the size.  This masks those bits.
276  */
277 #define HUGEPD_SHIFT_MASK     0x3f
278 
279 #ifndef __ASSEMBLY__
280 
281 #ifdef CONFIG_STRICT_MM_TYPECHECKS
282 /* These are used to make use of C type-checking. */
283 
284 /* PTE level */
285 typedef struct { pte_basic_t pte; } pte_t;
286 #define pte_val(x)      ((x).pte)
287 #define __pte(x)        ((pte_t) { (x) })
288 
289 /* 64k pages additionally define a bigger "real PTE" type that gathers
290  * the "second half" part of the PTE for pseudo 64k pages
291  */
292 #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
293 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
294 #else
295 typedef struct { pte_t pte; } real_pte_t;
296 #endif
297 
298 /* PMD level */
299 #ifdef CONFIG_PPC64
300 typedef struct { unsigned long pmd; } pmd_t;
301 #define pmd_val(x)      ((x).pmd)
302 #define __pmd(x)        ((pmd_t) { (x) })
303 
304 /* PUD level exusts only on 4k pages */
305 #ifndef CONFIG_PPC_64K_PAGES
306 typedef struct { unsigned long pud; } pud_t;
307 #define pud_val(x)      ((x).pud)
308 #define __pud(x)        ((pud_t) { (x) })
309 #endif /* !CONFIG_PPC_64K_PAGES */
310 #endif /* CONFIG_PPC64 */
311 
312 /* PGD level */
313 typedef struct { unsigned long pgd; } pgd_t;
314 #define pgd_val(x)      ((x).pgd)
315 #define __pgd(x)        ((pgd_t) { (x) })
316 
317 /* Page protection bits */
318 typedef struct { unsigned long pgprot; } pgprot_t;
319 #define pgprot_val(x)   ((x).pgprot)
320 #define __pgprot(x)     ((pgprot_t) { (x) })
321 
322 #else
323 
324 /*
325  * .. while these make it easier on the compiler
326  */
327 
328 typedef pte_basic_t pte_t;
329 #define pte_val(x)      (x)
330 #define __pte(x)        (x)
331 
332 #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
333 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
334 #else
335 typedef pte_t real_pte_t;
336 #endif
337 
338 
339 #ifdef CONFIG_PPC64
340 typedef unsigned long pmd_t;
341 #define pmd_val(x)      (x)
342 #define __pmd(x)        (x)
343 
344 #ifndef CONFIG_PPC_64K_PAGES
345 typedef unsigned long pud_t;
346 #define pud_val(x)      (x)
347 #define __pud(x)        (x)
348 #endif /* !CONFIG_PPC_64K_PAGES */
349 #endif /* CONFIG_PPC64 */
350 
351 typedef unsigned long pgd_t;
352 #define pgd_val(x)      (x)
353 #define pgprot_val(x)   (x)
354 
355 typedef unsigned long pgprot_t;
356 #define __pgd(x)        (x)
357 #define __pgprot(x)     (x)
358 
359 #endif
360 
361 typedef struct { signed long pd; } hugepd_t;
362 
363 #ifdef CONFIG_HUGETLB_PAGE
364 #ifdef CONFIG_PPC_BOOK3S_64
365 static inline int hugepd_ok(hugepd_t hpd)
366 {
367         /*
368          * hugepd pointer, bottom two bits == 00 and next 4 bits
369          * indicate size of table
370          */
371         return (((hpd.pd & 0x3) == 0x0) && ((hpd.pd & HUGEPD_SHIFT_MASK) != 0));
372 }
373 #else
374 static inline int hugepd_ok(hugepd_t hpd)
375 {
376         return (hpd.pd > 0);
377 }
378 #endif
379 
380 #define is_hugepd(hpd)               (hugepd_ok(hpd))
381 #define pgd_huge pgd_huge
382 int pgd_huge(pgd_t pgd);
383 #else /* CONFIG_HUGETLB_PAGE */
384 #define is_hugepd(pdep)                 0
385 #define pgd_huge(pgd)                   0
386 #endif /* CONFIG_HUGETLB_PAGE */
387 #define __hugepd(x) ((hugepd_t) { (x) })
388 
389 struct page;
390 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
391 extern void copy_user_page(void *to, void *from, unsigned long vaddr,
392                 struct page *p);
393 extern int page_is_ram(unsigned long pfn);
394 extern int devmem_is_allowed(unsigned long pfn);
395 
396 #ifdef CONFIG_PPC_SMLPAR
397 void arch_free_page(struct page *page, int order);
398 #define HAVE_ARCH_FREE_PAGE
399 #endif
400 
401 struct vm_area_struct;
402 
403 #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC64)
404 typedef pte_t *pgtable_t;
405 #else
406 typedef struct page *pgtable_t;
407 #endif
408 
409 #include <asm-generic/memory_model.h>
410 #endif /* __ASSEMBLY__ */
411 
412 #endif /* _ASM_POWERPC_PAGE_H */
413 

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