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
23static 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
28static 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
36static 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
44static 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
49static 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
57static 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
63extern pgd_t *pgd_alloc(struct mm_struct *mm);
64extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
65
66static 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 */
76static inline void
77pmd_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
83static inline void
84pmd_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