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_PREPARE_HUGEPAGE_RANGE 15 static inline int prepare_hugepage_range(struct file *file, 16 unsigned long addr, 17 unsigned long len) 18 { 19 unsigned long task_size = STACK_TOP; 20 struct hstate *h = hstate_file(file); 21 22 if (len & ~huge_page_mask(h)) 23 return -EINVAL; 24 if (addr & ~huge_page_mask(h)) 25 return -EINVAL; 26 if (len > task_size) 27 return -ENOMEM; 28 if (task_size - len < addr) 29 return -EINVAL; 30 return 0; 31 } 32 33 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR 34 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 35 unsigned long addr, pte_t *ptep) 36 { 37 pte_t clear; 38 pte_t pte = *ptep; 39 40 pte_val(clear) = (unsigned long)invalid_pte_table; 41 set_pte_at(mm, addr, ptep, clear); 42 return pte; 43 } 44 45 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH 46 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, 47 unsigned long addr, pte_t *ptep) 48 { 49 pte_t pte; 50 51 /* 52 * clear the huge pte entry firstly, so that the other smp threads will 53 * not get old pte entry after finishing flush_tlb_page and before 54 * setting new huge pte entry 55 */ 56 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); 57 flush_tlb_page(vma, addr); 58 return pte; 59 } 60 61 #define __HAVE_ARCH_HUGE_PTE_NONE 62 static inline int huge_pte_none(pte_t pte) 63 { 64 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL; 65 return !val || (val == (unsigned long)invalid_pte_table); 66 } 67 68 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS 69 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 70 unsigned long addr, 71 pte_t *ptep, pte_t pte, 72 int dirty) 73 { 74 int changed = !pte_same(*ptep, pte); 75 76 if (changed) { 77 set_pte_at(vma->vm_mm, addr, ptep, pte); 78 /* 79 * There could be some standard sized pages in there, 80 * get them all. 81 */ 82 flush_tlb_range(vma, addr, addr + HPAGE_SIZE); 83 } 84 return changed; 85 } 86 87 #include <asm-generic/hugetlb.h> 88 89 #endif /* __ASM_HUGETLB_H */ 90