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 static inline int is_hugepage_only_range(struct mm_struct *mm, 15 unsigned long addr, 16 unsigned long len) 17 { 18 return 0; 19 } 20 21 #define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE 22 static inline int prepare_hugepage_range(struct file *file, 23 unsigned long addr, 24 unsigned long len) 25 { 26 unsigned long task_size = STACK_TOP; 27 struct hstate *h = hstate_file(file); 28 29 if (len & ~huge_page_mask(h)) 30 return -EINVAL; 31 if (addr & ~huge_page_mask(h)) 32 return -EINVAL; 33 if (len > task_size) 34 return -ENOMEM; 35 if (task_size - len < addr) 36 return -EINVAL; 37 return 0; 38 } 39 40 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR 41 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 42 unsigned long addr, pte_t *ptep) 43 { 44 pte_t clear; 45 pte_t pte = *ptep; 46 47 pte_val(clear) = (unsigned long)invalid_pte_table; 48 set_pte_at(mm, addr, ptep, clear); 49 return pte; 50 } 51 52 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH 53 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, 54 unsigned long addr, pte_t *ptep) 55 { 56 flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma))); 57 } 58 59 #define __HAVE_ARCH_HUGE_PTE_NONE 60 static inline int huge_pte_none(pte_t pte) 61 { 62 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL; 63 return !val || (val == (unsigned long)invalid_pte_table); 64 } 65 66 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS 67 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 68 unsigned long addr, 69 pte_t *ptep, pte_t pte, 70 int dirty) 71 { 72 int changed = !pte_same(*ptep, pte); 73 74 if (changed) { 75 set_pte_at(vma->vm_mm, addr, ptep, pte); 76 /* 77 * There could be some standard sized pages in there, 78 * get them all. 79 */ 80 flush_tlb_range(vma, addr, addr + HPAGE_SIZE); 81 } 82 return changed; 83 } 84 85 static inline void arch_clear_hugepage_flags(struct page *page) 86 { 87 } 88 89 #include <asm-generic/hugetlb.h> 90 91 #endif /* __ASM_HUGETLB_H */ 92