~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/include/asm/page.h

Version: ~ [ linux-5.8-rc4 ] ~ [ linux-5.7.7 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.50 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.131 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.187 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.229 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.229 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 /* 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 
 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  *
 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  *
 81  * There are two ways to determine a physical address from a virtual one:
 82  * va = pa + PAGE_OFFSET - MEMORY_START
 83  * va = pa + KERNELBASE - PHYSICAL_START
 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  */
 90 
 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 
 95 #if defined(CONFIG_NONSTATIC_KERNEL)
 96 #ifndef __ASSEMBLY__
 97 
 98 extern phys_addr_t memstart_addr;
 99 extern phys_addr_t kernstart_addr;
100 
101 #ifdef CONFIG_RELOCATABLE_PPC32
102 extern long long virt_phys_offset;
103 #endif
104 
105 #endif /* __ASSEMBLY__ */
106 #define PHYSICAL_START  kernstart_addr
107 
108 #else   /* !CONFIG_NONSTATIC_KERNEL */
109 #define PHYSICAL_START  ASM_CONST(CONFIG_PHYSICAL_START)
110 #endif
111 
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 
120 #ifdef CONFIG_PPC64
121 #define MEMORY_START    0UL
122 #elif defined(CONFIG_NONSTATIC_KERNEL)
123 #define MEMORY_START    memstart_addr
124 #else
125 #define MEMORY_START    (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
126 #endif
127 
128 #ifdef CONFIG_FLATMEM
129 #define ARCH_PFN_OFFSET         ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
130 #define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
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 
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  *
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  *              
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
211 #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET))
212 #define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET)
213 #else
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 */
223 #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
224 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
225 #endif
226 #endif
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 
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  */
256 #ifdef CONFIG_PPC_BOOK3E_64
257 #define is_kernel_addr(x)       ((x) >= 0x8000000000000000ul)
258 #else
259 #define is_kernel_addr(x)       ((x) >= PAGE_OFFSET)
260 #endif
261 
262 #ifndef CONFIG_PPC_BOOK3S_64
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
274 #endif /* CONFIG_PPC_BOOK3S_64 */
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 
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  */
297 #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
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 */
304 #ifdef CONFIG_PPC64
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 */
310 #ifndef CONFIG_PPC_64K_PAGES
311 typedef struct { unsigned long pud; } pud_t;
312 #define pud_val(x)      ((x).pud)
313 #define __pud(x)        ((pud_t) { (x) })
314 #endif /* !CONFIG_PPC_64K_PAGES */
315 #endif /* CONFIG_PPC64 */
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 
337 #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
338 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
339 #else
340 typedef pte_t real_pte_t;
341 #endif
342 
343 
344 #ifdef CONFIG_PPC64
345 typedef unsigned long pmd_t;
346 #define pmd_val(x)      (x)
347 #define __pmd(x)        (x)
348 
349 #ifndef CONFIG_PPC_64K_PAGES
350 typedef unsigned long pud_t;
351 #define pud_val(x)      (x)
352 #define __pud(x)        (x)
353 #endif /* !CONFIG_PPC_64K_PAGES */
354 #endif /* CONFIG_PPC64 */
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 
366 typedef struct { signed long pd; } hugepd_t;
367 
368 #ifdef CONFIG_HUGETLB_PAGE
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
379 static inline int hugepd_ok(hugepd_t hpd)
380 {
381         return (hpd.pd > 0);
382 }
383 #endif
384 
385 #define is_hugepd(pdep)               (hugepd_ok(*((hugepd_t *)(pdep))))
386 int pgd_huge(pgd_t pgd);
387 #else /* CONFIG_HUGETLB_PAGE */
388 #define is_hugepd(pdep)                 0
389 #define pgd_huge(pgd)                   0
390 #endif /* CONFIG_HUGETLB_PAGE */
391 
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);
397 extern int devmem_is_allowed(unsigned long pfn);
398 
399 #ifdef CONFIG_PPC_SMLPAR
400 void arch_free_page(struct page *page, int order);
401 #define HAVE_ARCH_FREE_PAGE
402 #endif
403 
404 struct vm_area_struct;
405 
406 #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC64)
407 typedef pte_t *pgtable_t;
408 #else
409 typedef struct page *pgtable_t;
410 #endif
411 
412 #include <asm-generic/memory_model.h>
413 #endif /* __ASSEMBLY__ */
414 
415 #endif /* _ASM_POWERPC_PAGE_H */
416 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp