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 #define __HAVE_ARCH_PGD_FREE
17 #include <asm-generic/pgalloc.h>
18
19 #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
20
21 #if CONFIG_PGTABLE_LEVELS > 2
22
__pud_populate(pud_t * pudp,phys_addr_t pmdp,pudval_t prot)23 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
24 {
25 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
26 }
27
pud_populate(struct mm_struct * mm,pud_t * pudp,pmd_t * pmdp)28 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
29 {
30 pudval_t pudval = PUD_TYPE_TABLE;
31
32 pudval |= (mm == &init_mm) ? PUD_TABLE_UXN : PUD_TABLE_PXN;
33 __pud_populate(pudp, __pa(pmdp), pudval);
34 }
35 #else
__pud_populate(pud_t * pudp,phys_addr_t pmdp,pudval_t prot)36 static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
37 {
38 BUILD_BUG();
39 }
40 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
41
42 #if CONFIG_PGTABLE_LEVELS > 3
43
__p4d_populate(p4d_t * p4dp,phys_addr_t pudp,p4dval_t prot)44 static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
45 {
46 set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot));
47 }
48
p4d_populate(struct mm_struct * mm,p4d_t * p4dp,pud_t * pudp)49 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
50 {
51 p4dval_t p4dval = P4D_TYPE_TABLE;
52
53 p4dval |= (mm == &init_mm) ? P4D_TABLE_UXN : P4D_TABLE_PXN;
54 __p4d_populate(p4dp, __pa(pudp), p4dval);
55 }
56 #else
__p4d_populate(p4d_t * p4dp,phys_addr_t pudp,p4dval_t prot)57 static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
58 {
59 BUILD_BUG();
60 }
61 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
62
63 extern pgd_t *pgd_alloc(struct mm_struct *mm);
64 extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
65
__pmd_populate(pmd_t * pmdp,phys_addr_t ptep,pmdval_t prot)66 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
67 pmdval_t prot)
68 {
69 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
70 }
71
72 /*
73 * Populate the pmdp entry with a pointer to the pte. This pmd is part
74 * of the mm address space.
75 */
76 static inline void
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * ptep)77 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
78 {
79 VM_BUG_ON(mm && mm != &init_mm);
80 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE | PMD_TABLE_UXN);
81 }
82
83 static inline void
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t ptep)84 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
85 {
86 VM_BUG_ON(mm == &init_mm);
87 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE | PMD_TABLE_PXN);
88 }
89
90 #endif
91