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
6 * Copyright (C) 2003 Ralf Baechle
11 #include <linux/mm_types.h>
12 #include <linux/mmzone.h>
14 #include <asm/pgtable-32.h>
17 #include <asm/pgtable-64.h>
20 #include <asm/cmpxchg.h>
22 #include <asm/pgtable-bits.h>
23 #include <asm/cpu-features.h>
26 struct vm_area_struct;
28 #define PAGE_SHARED vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED)
30 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
31 _PAGE_GLOBAL | _page_cachable_default)
32 #define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
33 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
34 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
35 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
38 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
39 * execute, and consider it to be the same as read. Also, write
40 * permissions imply read permissions. This is the closest we can get
41 * by reasonable means..
45 * Dummy values to fill the table in mmap.c
46 * The real values will be generated at runtime
48 #define __P000 __pgprot(0)
49 #define __P001 __pgprot(0)
50 #define __P010 __pgprot(0)
51 #define __P011 __pgprot(0)
52 #define __P100 __pgprot(0)
53 #define __P101 __pgprot(0)
54 #define __P110 __pgprot(0)
55 #define __P111 __pgprot(0)
57 #define __S000 __pgprot(0)
58 #define __S001 __pgprot(0)
59 #define __S010 __pgprot(0)
60 #define __S011 __pgprot(0)
61 #define __S100 __pgprot(0)
62 #define __S101 __pgprot(0)
63 #define __S110 __pgprot(0)
64 #define __S111 __pgprot(0)
66 extern unsigned long _page_cachable_default;
69 * ZERO_PAGE is a global shared page that is always zero; used
70 * for zero-mapped memory areas etc..
73 extern unsigned long empty_zero_page;
74 extern unsigned long zero_page_mask;
76 #define ZERO_PAGE(vaddr) \
77 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
78 #define __HAVE_COLOR_ZERO_PAGE
80 extern void paging_init(void);
83 * Conversion functions: convert a page and protection to a page entry,
84 * and a page entry and page directory to the page they refer to.
86 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
88 #define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
89 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
90 #define pmd_page(pmd) __pmd_page(pmd)
91 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
93 #define pmd_page_vaddr(pmd) pmd_val(pmd)
97 unsigned long flags; \
100 local_irq_save(flags); \
101 if(!raw_current_cpu_data.htw_seq++) { \
102 write_c0_pwctl(read_c0_pwctl() & \
103 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
104 back_to_back_c0_hazard(); \
106 local_irq_restore(flags); \
110 #define htw_start() \
112 unsigned long flags; \
115 local_irq_save(flags); \
116 if (!--raw_current_cpu_data.htw_seq) { \
117 write_c0_pwctl(read_c0_pwctl() | \
118 (1 << MIPS_PWCTL_PWEN_SHIFT)); \
119 back_to_back_c0_hazard(); \
121 local_irq_restore(flags); \
125 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
126 pte_t *ptep, pte_t pteval);
128 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
131 # define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
133 # define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
136 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
137 #define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC)
139 static inline void set_pte(pte_t *ptep, pte_t pte)
141 ptep->pte_high = pte.pte_high;
143 ptep->pte_low = pte.pte_low;
146 if (pte.pte_high & _PAGE_GLOBAL) {
148 if (pte.pte_low & _PAGE_GLOBAL) {
150 pte_t *buddy = ptep_buddy(ptep);
152 * Make sure the buddy is global too (if it's !none,
153 * it better already be global)
155 if (pte_none(*buddy)) {
156 if (!IS_ENABLED(CONFIG_XPA))
157 buddy->pte_low |= _PAGE_GLOBAL;
158 buddy->pte_high |= _PAGE_GLOBAL;
163 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
165 pte_t null = __pte(0);
168 /* Preserve global status for the pair */
169 if (IS_ENABLED(CONFIG_XPA)) {
170 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
171 null.pte_high = _PAGE_GLOBAL;
173 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
174 null.pte_low = null.pte_high = _PAGE_GLOBAL;
177 set_pte_at(mm, addr, ptep, null);
182 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
183 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
184 #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
187 * Certain architectures need to do special things when pte's
188 * within a page table are directly modified. Thus, the following
189 * hook is made available.
191 static inline void set_pte(pte_t *ptep, pte_t pteval)
194 #if !defined(CONFIG_CPU_R3K_TLB)
195 if (pte_val(pteval) & _PAGE_GLOBAL) {
196 pte_t *buddy = ptep_buddy(ptep);
198 * Make sure the buddy is global too (if it's !none,
199 * it better already be global)
201 # if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32)
202 cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
204 cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL);
210 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
213 #if !defined(CONFIG_CPU_R3K_TLB)
214 /* Preserve global status for the pair */
215 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
216 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
219 set_pte_at(mm, addr, ptep, __pte(0));
224 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
225 pte_t *ptep, pte_t pteval)
227 extern void __update_cache(unsigned long address, pte_t pte);
229 if (!pte_present(pteval))
230 goto cache_sync_done;
232 if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
233 goto cache_sync_done;
235 __update_cache(addr, pteval);
237 set_pte(ptep, pteval);
241 * (pmds are folded into puds so this doesn't get actually called,
242 * but the define is needed for a generic inline function.)
244 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
246 #ifndef __PAGETABLE_PMD_FOLDED
248 * (puds are folded into pgds so this doesn't get actually called,
249 * but the define is needed for a generic inline function.)
251 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
254 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
255 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
256 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
259 * We used to declare this array with size but gcc 3.3 and older are not able
260 * to find that this expression is a constant, so the size is dropped.
262 extern pgd_t swapper_pg_dir[];
265 * Platform specific pte_special() and pte_mkspecial() definitions
266 * are required only when ARCH_HAS_PTE_SPECIAL is enabled.
268 #if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
269 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
270 static inline int pte_special(pte_t pte)
272 return pte.pte_low & _PAGE_SPECIAL;
275 static inline pte_t pte_mkspecial(pte_t pte)
277 pte.pte_low |= _PAGE_SPECIAL;
281 static inline int pte_special(pte_t pte)
283 return pte_val(pte) & _PAGE_SPECIAL;
286 static inline pte_t pte_mkspecial(pte_t pte)
288 pte_val(pte) |= _PAGE_SPECIAL;
292 #endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
295 * The following only work if pte_present() is true.
296 * Undefined behaviour if not..
298 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
299 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
300 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
301 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
303 static inline pte_t pte_wrprotect(pte_t pte)
305 pte.pte_low &= ~_PAGE_WRITE;
306 if (!IS_ENABLED(CONFIG_XPA))
307 pte.pte_low &= ~_PAGE_SILENT_WRITE;
308 pte.pte_high &= ~_PAGE_SILENT_WRITE;
312 static inline pte_t pte_mkclean(pte_t pte)
314 pte.pte_low &= ~_PAGE_MODIFIED;
315 if (!IS_ENABLED(CONFIG_XPA))
316 pte.pte_low &= ~_PAGE_SILENT_WRITE;
317 pte.pte_high &= ~_PAGE_SILENT_WRITE;
321 static inline pte_t pte_mkold(pte_t pte)
323 pte.pte_low &= ~_PAGE_ACCESSED;
324 if (!IS_ENABLED(CONFIG_XPA))
325 pte.pte_low &= ~_PAGE_SILENT_READ;
326 pte.pte_high &= ~_PAGE_SILENT_READ;
330 static inline pte_t pte_mkwrite(pte_t pte)
332 pte.pte_low |= _PAGE_WRITE;
333 if (pte.pte_low & _PAGE_MODIFIED) {
334 if (!IS_ENABLED(CONFIG_XPA))
335 pte.pte_low |= _PAGE_SILENT_WRITE;
336 pte.pte_high |= _PAGE_SILENT_WRITE;
341 static inline pte_t pte_mkdirty(pte_t pte)
343 pte.pte_low |= _PAGE_MODIFIED;
344 if (pte.pte_low & _PAGE_WRITE) {
345 if (!IS_ENABLED(CONFIG_XPA))
346 pte.pte_low |= _PAGE_SILENT_WRITE;
347 pte.pte_high |= _PAGE_SILENT_WRITE;
352 static inline pte_t pte_mkyoung(pte_t pte)
354 pte.pte_low |= _PAGE_ACCESSED;
355 if (!(pte.pte_low & _PAGE_NO_READ)) {
356 if (!IS_ENABLED(CONFIG_XPA))
357 pte.pte_low |= _PAGE_SILENT_READ;
358 pte.pte_high |= _PAGE_SILENT_READ;
363 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
364 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
365 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
367 static inline pte_t pte_wrprotect(pte_t pte)
369 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
373 static inline pte_t pte_mkclean(pte_t pte)
375 pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
379 static inline pte_t pte_mkold(pte_t pte)
381 pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
385 static inline pte_t pte_mkwrite(pte_t pte)
387 pte_val(pte) |= _PAGE_WRITE;
388 if (pte_val(pte) & _PAGE_MODIFIED)
389 pte_val(pte) |= _PAGE_SILENT_WRITE;
393 static inline pte_t pte_mkdirty(pte_t pte)
395 pte_val(pte) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
396 if (pte_val(pte) & _PAGE_WRITE)
397 pte_val(pte) |= _PAGE_SILENT_WRITE;
401 static inline pte_t pte_mkyoung(pte_t pte)
403 pte_val(pte) |= _PAGE_ACCESSED;
404 if (!(pte_val(pte) & _PAGE_NO_READ))
405 pte_val(pte) |= _PAGE_SILENT_READ;
409 #define pte_sw_mkyoung pte_mkyoung
411 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
412 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
414 static inline pte_t pte_mkhuge(pte_t pte)
416 pte_val(pte) |= _PAGE_HUGE;
419 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
421 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
422 static inline bool pte_soft_dirty(pte_t pte)
424 return pte_val(pte) & _PAGE_SOFT_DIRTY;
426 #define pte_swp_soft_dirty pte_soft_dirty
428 static inline pte_t pte_mksoft_dirty(pte_t pte)
430 pte_val(pte) |= _PAGE_SOFT_DIRTY;
433 #define pte_swp_mksoft_dirty pte_mksoft_dirty
435 static inline pte_t pte_clear_soft_dirty(pte_t pte)
437 pte_val(pte) &= ~(_PAGE_SOFT_DIRTY);
440 #define pte_swp_clear_soft_dirty pte_clear_soft_dirty
442 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
447 * Macro to make mark a page protection value as "uncacheable". Note
448 * that "protection" is really a misnomer here as the protection value
449 * contains the memory attribute bits, dirty bits, and various other
452 #define pgprot_noncached pgprot_noncached
454 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
456 unsigned long prot = pgprot_val(_prot);
458 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
460 return __pgprot(prot);
463 #define pgprot_writecombine pgprot_writecombine
465 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
467 unsigned long prot = pgprot_val(_prot);
469 /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
470 prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
472 return __pgprot(prot);
475 static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
476 unsigned long address)
480 #define __HAVE_ARCH_PTE_SAME
481 static inline int pte_same(pte_t pte_a, pte_t pte_b)
483 return pte_val(pte_a) == pte_val(pte_b);
486 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
487 static inline int ptep_set_access_flags(struct vm_area_struct *vma,
488 unsigned long address, pte_t *ptep,
489 pte_t entry, int dirty)
491 if (!pte_same(*ptep, entry))
492 set_pte_at(vma->vm_mm, address, ptep, entry);
494 * update_mmu_cache will unconditionally execute, handling both
495 * the case that the PTE changed and the spurious fault case.
501 * Conversion functions: convert a page and protection to a page entry,
502 * and a page entry and page directory to the page they refer to.
504 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
506 #if defined(CONFIG_XPA)
507 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
509 pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
510 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
511 pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK;
512 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
515 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
516 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
518 pte.pte_low &= _PAGE_CHG_MASK;
519 pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
520 pte.pte_low |= pgprot_val(newprot);
521 pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
525 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
527 pte_val(pte) &= _PAGE_CHG_MASK;
528 pte_val(pte) |= pgprot_val(newprot) & ~_PAGE_CHG_MASK;
529 if ((pte_val(pte) & _PAGE_ACCESSED) && !(pte_val(pte) & _PAGE_NO_READ))
530 pte_val(pte) |= _PAGE_SILENT_READ;
536 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
539 static inline void update_mmu_cache(struct vm_area_struct *vma,
540 unsigned long address, pte_t *ptep)
543 __update_tlb(vma, address, pte);
546 #define __HAVE_ARCH_UPDATE_MMU_TLB
547 #define update_mmu_tlb update_mmu_cache
549 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
550 unsigned long address, pmd_t *pmdp)
552 pte_t pte = *(pte_t *)pmdp;
554 __update_tlb(vma, address, pte);
557 #define kern_addr_valid(addr) (1)
560 * Allow physical addresses to be fixed up to help 36-bit peripherals.
562 #ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR
563 phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size);
564 int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr,
565 unsigned long pfn, unsigned long size, pgprot_t prot);
566 #define io_remap_pfn_range io_remap_pfn_range
568 #define fixup_bigphys_addr(addr, size) (addr)
569 #endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */
571 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
573 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
574 #define pmdp_establish generic_pmdp_establish
576 #define has_transparent_hugepage has_transparent_hugepage
577 extern int has_transparent_hugepage(void);
579 static inline int pmd_trans_huge(pmd_t pmd)
581 return !!(pmd_val(pmd) & _PAGE_HUGE);
584 static inline pmd_t pmd_mkhuge(pmd_t pmd)
586 pmd_val(pmd) |= _PAGE_HUGE;
591 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
592 pmd_t *pmdp, pmd_t pmd);
594 #define pmd_write pmd_write
595 static inline int pmd_write(pmd_t pmd)
597 return !!(pmd_val(pmd) & _PAGE_WRITE);
600 static inline pmd_t pmd_wrprotect(pmd_t pmd)
602 pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
606 static inline pmd_t pmd_mkwrite(pmd_t pmd)
608 pmd_val(pmd) |= _PAGE_WRITE;
609 if (pmd_val(pmd) & _PAGE_MODIFIED)
610 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
615 static inline int pmd_dirty(pmd_t pmd)
617 return !!(pmd_val(pmd) & _PAGE_MODIFIED);
620 static inline pmd_t pmd_mkclean(pmd_t pmd)
622 pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
626 static inline pmd_t pmd_mkdirty(pmd_t pmd)
628 pmd_val(pmd) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
629 if (pmd_val(pmd) & _PAGE_WRITE)
630 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
635 static inline int pmd_young(pmd_t pmd)
637 return !!(pmd_val(pmd) & _PAGE_ACCESSED);
640 static inline pmd_t pmd_mkold(pmd_t pmd)
642 pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
647 static inline pmd_t pmd_mkyoung(pmd_t pmd)
649 pmd_val(pmd) |= _PAGE_ACCESSED;
651 if (!(pmd_val(pmd) & _PAGE_NO_READ))
652 pmd_val(pmd) |= _PAGE_SILENT_READ;
657 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
658 static inline int pmd_soft_dirty(pmd_t pmd)
660 return !!(pmd_val(pmd) & _PAGE_SOFT_DIRTY);
663 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
665 pmd_val(pmd) |= _PAGE_SOFT_DIRTY;
669 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
671 pmd_val(pmd) &= ~(_PAGE_SOFT_DIRTY);
675 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
677 /* Extern to avoid header file madness */
678 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
680 static inline unsigned long pmd_pfn(pmd_t pmd)
682 return pmd_val(pmd) >> _PFN_SHIFT;
685 static inline struct page *pmd_page(pmd_t pmd)
687 if (pmd_trans_huge(pmd))
688 return pfn_to_page(pmd_pfn(pmd));
690 return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
693 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
695 pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
696 (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
700 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
702 pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
708 * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
709 * different prototype.
711 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
712 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
713 unsigned long address, pmd_t *pmdp)
722 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
725 #define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
726 #define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
729 #define gup_fast_permitted(start, end) (!cpu_has_dc_aliases)
732 * We provide our own get_unmapped area to cope with the virtual aliasing
733 * constraints placed on us by the cache architecture.
735 #define HAVE_ARCH_UNMAPPED_AREA
736 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
738 #endif /* _ASM_PGTABLE_H */