Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * linux/arch/unicore32/include/asm/pgalloc.h
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#ifndef __UNICORE_PGALLOC_H__
13#define __UNICORE_PGALLOC_H__
14
15#include <asm/pgtable-hwdef.h>
16#include <asm/processor.h>
17#include <asm/cacheflush.h>
18#include <asm/tlbflush.h>
19
20#define check_pgt_cache() do { } while (0)
21
22#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
23#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
24
25extern pgd_t *get_pgd_slow(struct mm_struct *mm);
26extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
27
28#define pgd_alloc(mm) get_pgd_slow(mm)
29#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
30
31#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
32
33/*
34 * Allocate one PTE table.
35 */
36static inline pte_t *
37pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
38{
39 pte_t *pte;
40
41 pte = (pte_t *)__get_free_page(PGALLOC_GFP);
42 if (pte)
43 clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
44
45 return pte;
46}
47
48static inline pgtable_t
49pte_alloc_one(struct mm_struct *mm, unsigned long addr)
50{
51 struct page *pte;
52
53 pte = alloc_pages(PGALLOC_GFP, 0);
54 if (pte) {
55 if (!PageHighMem(pte)) {
56 void *page = page_address(pte);
57 clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
58 }
59 pgtable_page_ctor(pte);
60 }
61
62 return pte;
63}
64
65/*
66 * Free one PTE table.
67 */
68static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
69{
70 if (pte)
71 free_page((unsigned long)pte);
72}
73
74static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
75{
76 pgtable_page_dtor(pte);
77 __free_page(pte);
78}
79
80static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
81{
82 set_pmd(pmdp, __pmd(pmdval));
83 flush_pmd_entry(pmdp);
84}
85
86/*
87 * Populate the pmdp entry with a pointer to the pte. This pmd is part
88 * of the mm address space.
89 */
90static inline void
91pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
92{
93 unsigned long pte_ptr = (unsigned long)ptep;
94
95 /*
96 * The pmd must be loaded with the physical
97 * address of the PTE table
98 */
99 __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
100}
101
102static inline void
103pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
104{
105 __pmd_populate(pmdp,
106 page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
107}
108#define pmd_pgtable(pmd) pmd_page(pmd)
109
110#endif