xref: /openbmc/linux/arch/mips/include/asm/pgtable.h (revision 82003e04)
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2003 Ralf Baechle
7  */
8 #ifndef _ASM_PGTABLE_H
9 #define _ASM_PGTABLE_H
10 
11 #include <linux/mm_types.h>
12 #include <linux/mmzone.h>
13 #ifdef CONFIG_32BIT
14 #include <asm/pgtable-32.h>
15 #endif
16 #ifdef CONFIG_64BIT
17 #include <asm/pgtable-64.h>
18 #endif
19 
20 #include <asm/io.h>
21 #include <asm/pgtable-bits.h>
22 
23 struct mm_struct;
24 struct vm_area_struct;
25 
26 #define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \
27 				 _page_cachable_default)
28 #define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
29 				 _page_cachable_default)
30 #define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
31 				 _page_cachable_default)
32 #define PAGE_READONLY	__pgprot(_PAGE_PRESENT | \
33 				 _page_cachable_default)
34 #define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
35 				 _PAGE_GLOBAL | _page_cachable_default)
36 #define PAGE_KERNEL_NC	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
37 				 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
38 #define PAGE_USERIO	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
39 				 _page_cachable_default)
40 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
41 			__WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
42 
43 /*
44  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
45  * execute, and consider it to be the same as read. Also, write
46  * permissions imply read permissions. This is the closest we can get
47  * by reasonable means..
48  */
49 
50 /*
51  * Dummy values to fill the table in mmap.c
52  * The real values will be generated at runtime
53  */
54 #define __P000 __pgprot(0)
55 #define __P001 __pgprot(0)
56 #define __P010 __pgprot(0)
57 #define __P011 __pgprot(0)
58 #define __P100 __pgprot(0)
59 #define __P101 __pgprot(0)
60 #define __P110 __pgprot(0)
61 #define __P111 __pgprot(0)
62 
63 #define __S000 __pgprot(0)
64 #define __S001 __pgprot(0)
65 #define __S010 __pgprot(0)
66 #define __S011 __pgprot(0)
67 #define __S100 __pgprot(0)
68 #define __S101 __pgprot(0)
69 #define __S110 __pgprot(0)
70 #define __S111 __pgprot(0)
71 
72 extern unsigned long _page_cachable_default;
73 
74 /*
75  * ZERO_PAGE is a global shared page that is always zero; used
76  * for zero-mapped memory areas etc..
77  */
78 
79 extern unsigned long empty_zero_page;
80 extern unsigned long zero_page_mask;
81 
82 #define ZERO_PAGE(vaddr) \
83 	(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
84 #define __HAVE_COLOR_ZERO_PAGE
85 
86 extern void paging_init(void);
87 
88 /*
89  * Conversion functions: convert a page and protection to a page entry,
90  * and a page entry and page directory to the page they refer to.
91  */
92 #define pmd_phys(pmd)		virt_to_phys((void *)pmd_val(pmd))
93 
94 #define __pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
95 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
96 #define pmd_page(pmd)		__pmd_page(pmd)
97 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
98 
99 #define pmd_page_vaddr(pmd)	pmd_val(pmd)
100 
101 #define htw_stop()							\
102 do {									\
103 	unsigned long flags;						\
104 									\
105 	if (cpu_has_htw) {						\
106 		local_irq_save(flags);					\
107 		if(!raw_current_cpu_data.htw_seq++) {			\
108 			write_c0_pwctl(read_c0_pwctl() &		\
109 				       ~(1 << MIPS_PWCTL_PWEN_SHIFT));	\
110 			back_to_back_c0_hazard();			\
111 		}							\
112 		local_irq_restore(flags);				\
113 	}								\
114 } while(0)
115 
116 #define htw_start()							\
117 do {									\
118 	unsigned long flags;						\
119 									\
120 	if (cpu_has_htw) {						\
121 		local_irq_save(flags);					\
122 		if (!--raw_current_cpu_data.htw_seq) {			\
123 			write_c0_pwctl(read_c0_pwctl() |		\
124 				       (1 << MIPS_PWCTL_PWEN_SHIFT));	\
125 			back_to_back_c0_hazard();			\
126 		}							\
127 		local_irq_restore(flags);				\
128 	}								\
129 } while(0)
130 
131 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
132 			      pte_t *ptep, pte_t pteval);
133 
134 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
135 
136 #ifdef CONFIG_XPA
137 # define pte_none(pte)		(!(((pte).pte_high) & ~_PAGE_GLOBAL))
138 #else
139 # define pte_none(pte)		(!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
140 #endif
141 
142 #define pte_present(pte)	((pte).pte_low & _PAGE_PRESENT)
143 #define pte_no_exec(pte)	((pte).pte_low & _PAGE_NO_EXEC)
144 
145 static inline void set_pte(pte_t *ptep, pte_t pte)
146 {
147 	ptep->pte_high = pte.pte_high;
148 	smp_wmb();
149 	ptep->pte_low = pte.pte_low;
150 
151 #ifdef CONFIG_XPA
152 	if (pte.pte_high & _PAGE_GLOBAL) {
153 #else
154 	if (pte.pte_low & _PAGE_GLOBAL) {
155 #endif
156 		pte_t *buddy = ptep_buddy(ptep);
157 		/*
158 		 * Make sure the buddy is global too (if it's !none,
159 		 * it better already be global)
160 		 */
161 		if (pte_none(*buddy)) {
162 			if (!IS_ENABLED(CONFIG_XPA))
163 				buddy->pte_low |= _PAGE_GLOBAL;
164 			buddy->pte_high |= _PAGE_GLOBAL;
165 		}
166 	}
167 }
168 
169 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
170 {
171 	pte_t null = __pte(0);
172 
173 	htw_stop();
174 	/* Preserve global status for the pair */
175 	if (IS_ENABLED(CONFIG_XPA)) {
176 		if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
177 			null.pte_high = _PAGE_GLOBAL;
178 	} else {
179 		if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
180 			null.pte_low = null.pte_high = _PAGE_GLOBAL;
181 	}
182 
183 	set_pte_at(mm, addr, ptep, null);
184 	htw_start();
185 }
186 #else
187 
188 #define pte_none(pte)		(!(pte_val(pte) & ~_PAGE_GLOBAL))
189 #define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)
190 #define pte_no_exec(pte)	(pte_val(pte) & _PAGE_NO_EXEC)
191 
192 /*
193  * Certain architectures need to do special things when pte's
194  * within a page table are directly modified.  Thus, the following
195  * hook is made available.
196  */
197 static inline void set_pte(pte_t *ptep, pte_t pteval)
198 {
199 	*ptep = pteval;
200 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
201 	if (pte_val(pteval) & _PAGE_GLOBAL) {
202 		pte_t *buddy = ptep_buddy(ptep);
203 		/*
204 		 * Make sure the buddy is global too (if it's !none,
205 		 * it better already be global)
206 		 */
207 #ifdef CONFIG_SMP
208 		/*
209 		 * For SMP, multiple CPUs can race, so we need to do
210 		 * this atomically.
211 		 */
212 		unsigned long page_global = _PAGE_GLOBAL;
213 		unsigned long tmp;
214 
215 		if (kernel_uses_llsc && R10000_LLSC_WAR) {
216 			__asm__ __volatile__ (
217 			"	.set	arch=r4000			\n"
218 			"	.set	push				\n"
219 			"	.set	noreorder			\n"
220 			"1:"	__LL	"%[tmp], %[buddy]		\n"
221 			"	bnez	%[tmp], 2f			\n"
222 			"	 or	%[tmp], %[tmp], %[global]	\n"
223 				__SC	"%[tmp], %[buddy]		\n"
224 			"	beqzl	%[tmp], 1b			\n"
225 			"	nop					\n"
226 			"2:						\n"
227 			"	.set	pop				\n"
228 			"	.set	mips0				\n"
229 			: [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
230 			: [global] "r" (page_global));
231 		} else if (kernel_uses_llsc) {
232 			__asm__ __volatile__ (
233 			"	.set	"MIPS_ISA_ARCH_LEVEL"		\n"
234 			"	.set	push				\n"
235 			"	.set	noreorder			\n"
236 			"1:"	__LL	"%[tmp], %[buddy]		\n"
237 			"	bnez	%[tmp], 2f			\n"
238 			"	 or	%[tmp], %[tmp], %[global]	\n"
239 				__SC	"%[tmp], %[buddy]		\n"
240 			"	beqz	%[tmp], 1b			\n"
241 			"	nop					\n"
242 			"2:						\n"
243 			"	.set	pop				\n"
244 			"	.set	mips0				\n"
245 			: [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
246 			: [global] "r" (page_global));
247 		}
248 #else /* !CONFIG_SMP */
249 		if (pte_none(*buddy))
250 			pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
251 #endif /* CONFIG_SMP */
252 	}
253 #endif
254 }
255 
256 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
257 {
258 	htw_stop();
259 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
260 	/* Preserve global status for the pair */
261 	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
262 		set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
263 	else
264 #endif
265 		set_pte_at(mm, addr, ptep, __pte(0));
266 	htw_start();
267 }
268 #endif
269 
270 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
271 			      pte_t *ptep, pte_t pteval)
272 {
273 	extern void __update_cache(unsigned long address, pte_t pte);
274 
275 	if (!pte_present(pteval))
276 		goto cache_sync_done;
277 
278 	if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
279 		goto cache_sync_done;
280 
281 	__update_cache(addr, pteval);
282 cache_sync_done:
283 	set_pte(ptep, pteval);
284 }
285 
286 /*
287  * (pmds are folded into puds so this doesn't get actually called,
288  * but the define is needed for a generic inline function.)
289  */
290 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
291 
292 #ifndef __PAGETABLE_PMD_FOLDED
293 /*
294  * (puds are folded into pgds so this doesn't get actually called,
295  * but the define is needed for a generic inline function.)
296  */
297 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
298 #endif
299 
300 #define PGD_T_LOG2	(__builtin_ffs(sizeof(pgd_t)) - 1)
301 #define PMD_T_LOG2	(__builtin_ffs(sizeof(pmd_t)) - 1)
302 #define PTE_T_LOG2	(__builtin_ffs(sizeof(pte_t)) - 1)
303 
304 /*
305  * We used to declare this array with size but gcc 3.3 and older are not able
306  * to find that this expression is a constant, so the size is dropped.
307  */
308 extern pgd_t swapper_pg_dir[];
309 
310 /*
311  * The following only work if pte_present() is true.
312  * Undefined behaviour if not..
313  */
314 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
315 static inline int pte_write(pte_t pte)	{ return pte.pte_low & _PAGE_WRITE; }
316 static inline int pte_dirty(pte_t pte)	{ return pte.pte_low & _PAGE_MODIFIED; }
317 static inline int pte_young(pte_t pte)	{ return pte.pte_low & _PAGE_ACCESSED; }
318 
319 static inline pte_t pte_wrprotect(pte_t pte)
320 {
321 	pte.pte_low  &= ~_PAGE_WRITE;
322 	if (!IS_ENABLED(CONFIG_XPA))
323 		pte.pte_low &= ~_PAGE_SILENT_WRITE;
324 	pte.pte_high &= ~_PAGE_SILENT_WRITE;
325 	return pte;
326 }
327 
328 static inline pte_t pte_mkclean(pte_t pte)
329 {
330 	pte.pte_low  &= ~_PAGE_MODIFIED;
331 	if (!IS_ENABLED(CONFIG_XPA))
332 		pte.pte_low &= ~_PAGE_SILENT_WRITE;
333 	pte.pte_high &= ~_PAGE_SILENT_WRITE;
334 	return pte;
335 }
336 
337 static inline pte_t pte_mkold(pte_t pte)
338 {
339 	pte.pte_low  &= ~_PAGE_ACCESSED;
340 	if (!IS_ENABLED(CONFIG_XPA))
341 		pte.pte_low &= ~_PAGE_SILENT_READ;
342 	pte.pte_high &= ~_PAGE_SILENT_READ;
343 	return pte;
344 }
345 
346 static inline pte_t pte_mkwrite(pte_t pte)
347 {
348 	pte.pte_low |= _PAGE_WRITE;
349 	if (pte.pte_low & _PAGE_MODIFIED) {
350 		if (!IS_ENABLED(CONFIG_XPA))
351 			pte.pte_low |= _PAGE_SILENT_WRITE;
352 		pte.pte_high |= _PAGE_SILENT_WRITE;
353 	}
354 	return pte;
355 }
356 
357 static inline pte_t pte_mkdirty(pte_t pte)
358 {
359 	pte.pte_low |= _PAGE_MODIFIED;
360 	if (pte.pte_low & _PAGE_WRITE) {
361 		if (!IS_ENABLED(CONFIG_XPA))
362 			pte.pte_low |= _PAGE_SILENT_WRITE;
363 		pte.pte_high |= _PAGE_SILENT_WRITE;
364 	}
365 	return pte;
366 }
367 
368 static inline pte_t pte_mkyoung(pte_t pte)
369 {
370 	pte.pte_low |= _PAGE_ACCESSED;
371 	if (!(pte.pte_low & _PAGE_NO_READ)) {
372 		if (!IS_ENABLED(CONFIG_XPA))
373 			pte.pte_low |= _PAGE_SILENT_READ;
374 		pte.pte_high |= _PAGE_SILENT_READ;
375 	}
376 	return pte;
377 }
378 #else
379 static inline int pte_write(pte_t pte)	{ return pte_val(pte) & _PAGE_WRITE; }
380 static inline int pte_dirty(pte_t pte)	{ return pte_val(pte) & _PAGE_MODIFIED; }
381 static inline int pte_young(pte_t pte)	{ return pte_val(pte) & _PAGE_ACCESSED; }
382 
383 static inline pte_t pte_wrprotect(pte_t pte)
384 {
385 	pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
386 	return pte;
387 }
388 
389 static inline pte_t pte_mkclean(pte_t pte)
390 {
391 	pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
392 	return pte;
393 }
394 
395 static inline pte_t pte_mkold(pte_t pte)
396 {
397 	pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
398 	return pte;
399 }
400 
401 static inline pte_t pte_mkwrite(pte_t pte)
402 {
403 	pte_val(pte) |= _PAGE_WRITE;
404 	if (pte_val(pte) & _PAGE_MODIFIED)
405 		pte_val(pte) |= _PAGE_SILENT_WRITE;
406 	return pte;
407 }
408 
409 static inline pte_t pte_mkdirty(pte_t pte)
410 {
411 	pte_val(pte) |= _PAGE_MODIFIED;
412 	if (pte_val(pte) & _PAGE_WRITE)
413 		pte_val(pte) |= _PAGE_SILENT_WRITE;
414 	return pte;
415 }
416 
417 static inline pte_t pte_mkyoung(pte_t pte)
418 {
419 	pte_val(pte) |= _PAGE_ACCESSED;
420 	if (!(pte_val(pte) & _PAGE_NO_READ))
421 		pte_val(pte) |= _PAGE_SILENT_READ;
422 	return pte;
423 }
424 
425 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
426 static inline int pte_huge(pte_t pte)	{ return pte_val(pte) & _PAGE_HUGE; }
427 
428 static inline pte_t pte_mkhuge(pte_t pte)
429 {
430 	pte_val(pte) |= _PAGE_HUGE;
431 	return pte;
432 }
433 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
434 #endif
435 static inline int pte_special(pte_t pte)	{ return 0; }
436 static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
437 
438 /*
439  * Macro to make mark a page protection value as "uncacheable".	 Note
440  * that "protection" is really a misnomer here as the protection value
441  * contains the memory attribute bits, dirty bits, and various other
442  * bits as well.
443  */
444 #define pgprot_noncached pgprot_noncached
445 
446 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
447 {
448 	unsigned long prot = pgprot_val(_prot);
449 
450 	prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
451 
452 	return __pgprot(prot);
453 }
454 
455 #define pgprot_writecombine pgprot_writecombine
456 
457 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
458 {
459 	unsigned long prot = pgprot_val(_prot);
460 
461 	/* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
462 	prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
463 
464 	return __pgprot(prot);
465 }
466 
467 /*
468  * Conversion functions: convert a page and protection to a page entry,
469  * and a page entry and page directory to the page they refer to.
470  */
471 #define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
472 
473 #if defined(CONFIG_XPA)
474 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
475 {
476 	pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
477 	pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
478 	pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
479 	pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
480 	return pte;
481 }
482 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
483 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
484 {
485 	pte.pte_low  &= _PAGE_CHG_MASK;
486 	pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
487 	pte.pte_low  |= pgprot_val(newprot);
488 	pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
489 	return pte;
490 }
491 #else
492 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
493 {
494 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
495 		     (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
496 }
497 #endif
498 
499 
500 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
501 	pte_t pte);
502 
503 static inline void update_mmu_cache(struct vm_area_struct *vma,
504 	unsigned long address, pte_t *ptep)
505 {
506 	pte_t pte = *ptep;
507 	__update_tlb(vma, address, pte);
508 }
509 
510 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
511 	unsigned long address, pmd_t *pmdp)
512 {
513 	pte_t pte = *(pte_t *)pmdp;
514 
515 	__update_tlb(vma, address, pte);
516 }
517 
518 #define kern_addr_valid(addr)	(1)
519 
520 #ifdef CONFIG_PHYS_ADDR_T_64BIT
521 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
522 
523 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
524 		unsigned long vaddr,
525 		unsigned long pfn,
526 		unsigned long size,
527 		pgprot_t prot)
528 {
529 	phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
530 	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
531 }
532 #define io_remap_pfn_range io_remap_pfn_range
533 #endif
534 
535 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
536 
537 #define has_transparent_hugepage has_transparent_hugepage
538 extern int has_transparent_hugepage(void);
539 
540 static inline int pmd_trans_huge(pmd_t pmd)
541 {
542 	return !!(pmd_val(pmd) & _PAGE_HUGE);
543 }
544 
545 static inline pmd_t pmd_mkhuge(pmd_t pmd)
546 {
547 	pmd_val(pmd) |= _PAGE_HUGE;
548 
549 	return pmd;
550 }
551 
552 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
553 		       pmd_t *pmdp, pmd_t pmd);
554 
555 #define __HAVE_ARCH_PMD_WRITE
556 static inline int pmd_write(pmd_t pmd)
557 {
558 	return !!(pmd_val(pmd) & _PAGE_WRITE);
559 }
560 
561 static inline pmd_t pmd_wrprotect(pmd_t pmd)
562 {
563 	pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
564 	return pmd;
565 }
566 
567 static inline pmd_t pmd_mkwrite(pmd_t pmd)
568 {
569 	pmd_val(pmd) |= _PAGE_WRITE;
570 	if (pmd_val(pmd) & _PAGE_MODIFIED)
571 		pmd_val(pmd) |= _PAGE_SILENT_WRITE;
572 
573 	return pmd;
574 }
575 
576 static inline int pmd_dirty(pmd_t pmd)
577 {
578 	return !!(pmd_val(pmd) & _PAGE_MODIFIED);
579 }
580 
581 static inline pmd_t pmd_mkclean(pmd_t pmd)
582 {
583 	pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
584 	return pmd;
585 }
586 
587 static inline pmd_t pmd_mkdirty(pmd_t pmd)
588 {
589 	pmd_val(pmd) |= _PAGE_MODIFIED;
590 	if (pmd_val(pmd) & _PAGE_WRITE)
591 		pmd_val(pmd) |= _PAGE_SILENT_WRITE;
592 
593 	return pmd;
594 }
595 
596 static inline int pmd_young(pmd_t pmd)
597 {
598 	return !!(pmd_val(pmd) & _PAGE_ACCESSED);
599 }
600 
601 static inline pmd_t pmd_mkold(pmd_t pmd)
602 {
603 	pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
604 
605 	return pmd;
606 }
607 
608 static inline pmd_t pmd_mkyoung(pmd_t pmd)
609 {
610 	pmd_val(pmd) |= _PAGE_ACCESSED;
611 
612 	if (!(pmd_val(pmd) & _PAGE_NO_READ))
613 		pmd_val(pmd) |= _PAGE_SILENT_READ;
614 
615 	return pmd;
616 }
617 
618 /* Extern to avoid header file madness */
619 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
620 
621 static inline unsigned long pmd_pfn(pmd_t pmd)
622 {
623 	return pmd_val(pmd) >> _PFN_SHIFT;
624 }
625 
626 static inline struct page *pmd_page(pmd_t pmd)
627 {
628 	if (pmd_trans_huge(pmd))
629 		return pfn_to_page(pmd_pfn(pmd));
630 
631 	return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
632 }
633 
634 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
635 {
636 	pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
637 		       (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
638 	return pmd;
639 }
640 
641 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
642 {
643 	pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
644 
645 	return pmd;
646 }
647 
648 /*
649  * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
650  * different prototype.
651  */
652 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
653 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
654 					    unsigned long address, pmd_t *pmdp)
655 {
656 	pmd_t old = *pmdp;
657 
658 	pmd_clear(pmdp);
659 
660 	return old;
661 }
662 
663 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
664 
665 #include <asm-generic/pgtable.h>
666 
667 /*
668  * uncached accelerated TLB map for video memory access
669  */
670 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
671 #define __HAVE_PHYS_MEM_ACCESS_PROT
672 
673 struct file;
674 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
675 		unsigned long size, pgprot_t vma_prot);
676 #endif
677 
678 /*
679  * We provide our own get_unmapped area to cope with the virtual aliasing
680  * constraints placed on us by the cache architecture.
681  */
682 #define HAVE_ARCH_UNMAPPED_AREA
683 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
684 
685 /*
686  * No page table caches to initialise
687  */
688 #define pgtable_cache_init()	do { } while (0)
689 
690 #endif /* _ASM_PGTABLE_H */
691