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