tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
15static 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
29static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
30 unsigned long addr, pte_t *ptep,
31 unsigned long sz)
32{
33 pte_t clear;
34 pte_t pte = *ptep;
35
36 pte_val(clear) = (unsigned long)invalid_pte_table;
37 set_pte_at(mm, addr, ptep, clear);
38 return pte;
39}
40
41#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
42static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
43 unsigned long addr, pte_t *ptep)
44{
45 pte_t pte;
46 unsigned long sz = huge_page_size(hstate_vma(vma));
47
48 /*
49 * clear the huge pte entry firstly, so that the other smp threads will
50 * not get old pte entry after finishing flush_tlb_page and before
51 * setting new huge pte entry
52 */
53 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep, sz);
54 flush_tlb_page(vma, addr);
55 return pte;
56}
57
58#define __HAVE_ARCH_HUGE_PTE_NONE
59static inline int huge_pte_none(pte_t pte)
60{
61 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
62 return !val || (val == (unsigned long)invalid_pte_table);
63}
64
65#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
66static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
67 unsigned long addr,
68 pte_t *ptep, pte_t pte,
69 int dirty)
70{
71 int changed = !pte_same(*ptep, pte);
72
73 if (changed) {
74 set_pte_at(vma->vm_mm, addr, ptep, pte);
75 /*
76 * There could be some standard sized pages in there,
77 * get them all.
78 */
79 flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
80 }
81 return changed;
82}
83
84#include <asm-generic/hugetlb.h>
85
86#endif /* __ASM_HUGETLB_H */