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7#ifndef _ASMARM_PGALLOC_H
8#define _ASMARM_PGALLOC_H
9
10#include <linux/pagemap.h>
11
12#include <asm/domain.h>
13#include <asm/pgtable-hwdef.h>
14#include <asm/processor.h>
15#include <asm/cacheflush.h>
16#include <asm/tlbflush.h>
17
18#ifdef CONFIG_MMU
19
20#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
21#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
22
23#ifdef CONFIG_ARM_LPAE
24#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
25
26static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
27{
28 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
29}
30
31#else
32#define PGD_SIZE (PAGE_SIZE << 2)
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36
37#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
38#define pmd_free(mm, pmd) do { } while (0)
39#ifdef CONFIG_KASAN
40
41#define pud_populate(mm,pmd,pte) do { } while (0)
42#else
43#define pud_populate(mm,pmd,pte) BUG()
44#endif
45#endif
46
47extern pgd_t *pgd_alloc(struct mm_struct *mm);
48extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
49
50static inline void clean_pte_table(pte_t *pte)
51{
52 clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
53}
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72#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
73#define __HAVE_ARCH_PTE_ALLOC_ONE
74#define __HAVE_ARCH_PGD_FREE
75#include <asm-generic/pgalloc.h>
76
77static inline pte_t *
78pte_alloc_one_kernel(struct mm_struct *mm)
79{
80 pte_t *pte = __pte_alloc_one_kernel(mm);
81
82 if (pte)
83 clean_pte_table(pte);
84
85 return pte;
86}
87
88#ifdef CONFIG_HIGHPTE
89#define PGTABLE_HIGHMEM __GFP_HIGHMEM
90#else
91#define PGTABLE_HIGHMEM 0
92#endif
93
94static inline pgtable_t
95pte_alloc_one(struct mm_struct *mm)
96{
97 struct page *pte;
98
99 pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM);
100 if (!pte)
101 return NULL;
102 if (!PageHighMem(pte))
103 clean_pte_table(page_address(pte));
104 return pte;
105}
106
107static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
108 pmdval_t prot)
109{
110 pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
111 pmdp[0] = __pmd(pmdval);
112#ifndef CONFIG_ARM_LPAE
113 pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
114#endif
115 flush_pmd_entry(pmdp);
116}
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123
124static inline void
125pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
126{
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130 __pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
131}
132
133static inline void
134pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
135{
136 extern pmdval_t user_pmd_table;
137 pmdval_t prot;
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139 if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
140 prot = user_pmd_table;
141 else
142 prot = _PAGE_USER_TABLE;
143
144 __pmd_populate(pmdp, page_to_phys(ptep), prot);
145}
146#define pmd_pgtable(pmd) pmd_page(pmd)
147
148#endif
149
150#endif
151