1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
3*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive
4*4882a593Smuzhiyun * for more details.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (C) 2008, 2009 Cavium Networks, Inc.
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #ifndef __ASM_HUGETLB_H
10*4882a593Smuzhiyun #define __ASM_HUGETLB_H
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <asm/page.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
prepare_hugepage_range(struct file * file,unsigned long addr,unsigned long len)15*4882a593Smuzhiyun static inline int prepare_hugepage_range(struct file *file,
16*4882a593Smuzhiyun unsigned long addr,
17*4882a593Smuzhiyun unsigned long len)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun unsigned long task_size = STACK_TOP;
20*4882a593Smuzhiyun struct hstate *h = hstate_file(file);
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun if (len & ~huge_page_mask(h))
23*4882a593Smuzhiyun return -EINVAL;
24*4882a593Smuzhiyun if (addr & ~huge_page_mask(h))
25*4882a593Smuzhiyun return -EINVAL;
26*4882a593Smuzhiyun if (len > task_size)
27*4882a593Smuzhiyun return -ENOMEM;
28*4882a593Smuzhiyun if (task_size - len < addr)
29*4882a593Smuzhiyun return -EINVAL;
30*4882a593Smuzhiyun return 0;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
huge_ptep_get_and_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)34*4882a593Smuzhiyun static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
35*4882a593Smuzhiyun unsigned long addr, pte_t *ptep)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun pte_t clear;
38*4882a593Smuzhiyun pte_t pte = *ptep;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun pte_val(clear) = (unsigned long)invalid_pte_table;
41*4882a593Smuzhiyun set_pte_at(mm, addr, ptep, clear);
42*4882a593Smuzhiyun return pte;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
huge_ptep_clear_flush(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep)46*4882a593Smuzhiyun static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
47*4882a593Smuzhiyun unsigned long addr, pte_t *ptep)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun /*
50*4882a593Smuzhiyun * clear the huge pte entry firstly, so that the other smp threads will
51*4882a593Smuzhiyun * not get old pte entry after finishing flush_tlb_page and before
52*4882a593Smuzhiyun * setting new huge pte entry
53*4882a593Smuzhiyun */
54*4882a593Smuzhiyun huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
55*4882a593Smuzhiyun flush_tlb_page(vma, addr);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun #define __HAVE_ARCH_HUGE_PTE_NONE
huge_pte_none(pte_t pte)59*4882a593Smuzhiyun static inline int huge_pte_none(pte_t pte)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
62*4882a593Smuzhiyun return !val || (val == (unsigned long)invalid_pte_table);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
huge_ptep_set_access_flags(struct vm_area_struct * vma,unsigned long addr,pte_t * ptep,pte_t pte,int dirty)66*4882a593Smuzhiyun static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
67*4882a593Smuzhiyun unsigned long addr,
68*4882a593Smuzhiyun pte_t *ptep, pte_t pte,
69*4882a593Smuzhiyun int dirty)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun int changed = !pte_same(*ptep, pte);
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun if (changed) {
74*4882a593Smuzhiyun set_pte_at(vma->vm_mm, addr, ptep, pte);
75*4882a593Smuzhiyun /*
76*4882a593Smuzhiyun * There could be some standard sized pages in there,
77*4882a593Smuzhiyun * get them all.
78*4882a593Smuzhiyun */
79*4882a593Smuzhiyun flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun return changed;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun #include <asm-generic/hugetlb.h>
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun #endif /* __ASM_HUGETLB_H */
87