xref: /openbmc/linux/arch/arm64/include/asm/pgalloc.h (revision 867e6d38)
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 
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 
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
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 
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 
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
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 
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
77 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
78 {
79 	VM_BUG_ON(mm != &init_mm);
80 	__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE | PMD_TABLE_UXN);
81 }
82 
83 static inline void
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 #define pmd_pgtable(pmd) pmd_page(pmd)
90 
91 #endif
92