1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Based on arch/arm/include/asm/pgalloc.h
4 *
5 * Copyright (C) 2000-2001 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 */
8 #ifndef __ASM_PGALLOC_H
9 #define __ASM_PGALLOC_H
10
11 #include <asm/pgtable-hwdef.h>
12 #include <asm/processor.h>
13 #include <asm/cacheflush.h>
14 #include <asm/tlbflush.h>
15
16 #include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
17
18 #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
19
20 #if CONFIG_PGTABLE_LEVELS > 2
21
pmd_alloc_one(struct mm_struct * mm,unsigned long addr)22 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
23 {
24 gfp_t gfp = GFP_PGTABLE_USER;
25 struct page *page;
26
27 if (mm == &init_mm)
28 gfp = GFP_PGTABLE_KERNEL;
29
30 page = alloc_page(gfp);
31 if (!page)
32 return NULL;
33 if (!pgtable_pmd_page_ctor(page)) {
34 __free_page(page);
35 return NULL;
36 }
37 return page_address(page);
38 }
39
pmd_free(struct mm_struct * mm,pmd_t * pmdp)40 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
41 {
42 BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
43 pgtable_pmd_page_dtor(virt_to_page(pmdp));
44 free_page((unsigned long)pmdp);
45 }
46
__pud_populate(pud_t * pudp,phys_addr_t pmdp,pudval_t prot)47 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
48 {
49 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
50 }
51
pud_populate(struct mm_struct * mm,pud_t * pudp,pmd_t * pmdp)52 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
53 {
54 __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
55 }
56 #else
__pud_populate(pud_t * pudp,phys_addr_t pmdp,pudval_t prot)57 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
58 {
59 BUILD_BUG();
60 }
61 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
62
63 #if CONFIG_PGTABLE_LEVELS > 3
64
pud_alloc_one(struct mm_struct * mm,unsigned long addr)65 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
66 {
67 return (pud_t *)__get_free_page(GFP_PGTABLE_USER);
68 }
69
pud_free(struct mm_struct * mm,pud_t * pudp)70 static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
71 {
72 BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
73 free_page((unsigned long)pudp);
74 }
75
__pgd_populate(pgd_t * pgdp,phys_addr_t pudp,pgdval_t prot)76 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
77 {
78 set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
79 }
80
pgd_populate(struct mm_struct * mm,pgd_t * pgdp,pud_t * pudp)81 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
82 {
83 __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
84 }
85 #else
__pgd_populate(pgd_t * pgdp,phys_addr_t pudp,pgdval_t prot)86 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
87 {
88 BUILD_BUG();
89 }
90 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
91
92 extern pgd_t *pgd_alloc(struct mm_struct *mm);
93 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
94
__pmd_populate(pmd_t * pmdp,phys_addr_t ptep,pmdval_t prot)95 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
96 pmdval_t prot)
97 {
98 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
99 }
100
101 /*
102 * Populate the pmdp entry with a pointer to the pte. This pmd is part
103 * of the mm address space.
104 */
105 static inline void
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * ptep)106 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
107 {
108 /*
109 * The pmd must be loaded with the physical address of the PTE table
110 */
111 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
112 }
113
114 static inline void
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t ptep)115 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
116 {
117 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
118 }
119 #define pmd_pgtable(pmd) pmd_page(pmd)
120
121 #endif
122