1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _METAG_PGALLOC_H
3 #define _METAG_PGALLOC_H
4
5 #include <linux/threads.h>
6 #include <linux/mm.h>
7
8 #define pmd_populate_kernel(mm, pmd, pte) \
9 set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
10
11 #define pmd_populate(mm, pmd, pte) \
12 set_pmd(pmd, __pmd(_PAGE_TABLE | page_to_phys(pte)))
13
14 #define pmd_pgtable(pmd) pmd_page(pmd)
15
16 /*
17 * Allocate and free page tables.
18 */
19 #ifdef CONFIG_METAG_META21_MMU
pgd_ctor(pgd_t * pgd)20 static inline void pgd_ctor(pgd_t *pgd)
21 {
22 memcpy(pgd + USER_PTRS_PER_PGD,
23 swapper_pg_dir + USER_PTRS_PER_PGD,
24 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
25 }
26 #else
27 #define pgd_ctor(x) do { } while (0)
28 #endif
29
pgd_alloc(struct mm_struct * mm)30 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
31 {
32 pgd_t *pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
33 if (pgd)
34 pgd_ctor(pgd);
35 return pgd;
36 }
37
pgd_free(struct mm_struct * mm,pgd_t * pgd)38 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
39 {
40 free_page((unsigned long)pgd);
41 }
42
pte_alloc_one_kernel(struct mm_struct * mm,unsigned long address)43 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
44 unsigned long address)
45 {
46 pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
47 return pte;
48 }
49
pte_alloc_one(struct mm_struct * mm,unsigned long address)50 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
51 unsigned long address)
52 {
53 struct page *pte;
54 pte = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0);
55 if (!pte)
56 return NULL;
57 if (!pgtable_page_ctor(pte)) {
58 __free_page(pte);
59 return NULL;
60 }
61 return pte;
62 }
63
pte_free_kernel(struct mm_struct * mm,pte_t * pte)64 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
65 {
66 free_page((unsigned long)pte);
67 }
68
pte_free(struct mm_struct * mm,pgtable_t pte)69 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
70 {
71 pgtable_page_dtor(pte);
72 __free_page(pte);
73 }
74
75 #define __pte_free_tlb(tlb, pte, addr) \
76 do { \
77 pgtable_page_dtor(pte); \
78 tlb_remove_page((tlb), (pte)); \
79 } while (0)
80
81 #define check_pgt_cache() do { } while (0)
82
83 #endif
84