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) 2008, 2009 Cavium Networks, Inc. 7 */ 8 9 #ifndef __ASM_HUGETLB_H 10 #define __ASM_HUGETLB_H 11 12 #include <asm/page.h> 13 14 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR 15 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 16 unsigned long addr, pte_t *ptep, 17 unsigned long sz) 18 { 19 pte_t clear; 20 pte_t pte = *ptep; 21 22 pte_val(clear) = (unsigned long)invalid_pte_table; 23 set_pte_at(mm, addr, ptep, clear); 24 return pte; 25 } 26 27 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH 28 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, 29 unsigned long addr, pte_t *ptep) 30 { 31 pte_t pte; 32 unsigned long sz = huge_page_size(hstate_vma(vma)); 33 34 /* 35 * clear the huge pte entry firstly, so that the other smp threads will 36 * not get old pte entry after finishing flush_tlb_page and before 37 * setting new huge pte entry 38 */ 39 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep, sz); 40 flush_tlb_page(vma, addr); 41 return pte; 42 } 43 44 #define __HAVE_ARCH_HUGE_PTE_NONE 45 static inline int huge_pte_none(pte_t pte) 46 { 47 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL; 48 return !val || (val == (unsigned long)invalid_pte_table); 49 } 50 51 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS 52 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 53 unsigned long addr, 54 pte_t *ptep, pte_t pte, 55 int dirty) 56 { 57 int changed = !pte_same(*ptep, pte); 58 59 if (changed) { 60 set_pte_at(vma->vm_mm, addr, ptep, pte); 61 /* 62 * There could be some standard sized pages in there, 63 * get them all. 64 */ 65 flush_tlb_range(vma, addr, addr + HPAGE_SIZE); 66 } 67 return changed; 68 } 69 70 #include <asm-generic/hugetlb.h> 71 72 #endif /* __ASM_HUGETLB_H */ 73