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#define __HAVE_ARCH_PUD_FREE
18#include <asm-generic/pgalloc.h>
19
20#define PGD_SIZE	(PTRS_PER_PGD * sizeof(pgd_t))
21
22#if CONFIG_PGTABLE_LEVELS > 2
23
24static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
25{
26	set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
27}
28
29static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
30{
31	pudval_t pudval = PUD_TYPE_TABLE;
32
33	pudval |= (mm == &init_mm) ? PUD_TABLE_UXN : PUD_TABLE_PXN;
34	__pud_populate(pudp, __pa(pmdp), pudval);
35}
36#else
37static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
38{
39	BUILD_BUG();
40}
41#endif	/* CONFIG_PGTABLE_LEVELS > 2 */
42
43#if CONFIG_PGTABLE_LEVELS > 3
44
45static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
46{
47	if (pgtable_l4_enabled())
48		set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot));
49}
50
51static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
52{
53	p4dval_t p4dval = P4D_TYPE_TABLE;
54
55	p4dval |= (mm == &init_mm) ? P4D_TABLE_UXN : P4D_TABLE_PXN;
56	__p4d_populate(p4dp, __pa(pudp), p4dval);
57}
58
59static inline void pud_free(struct mm_struct *mm, pud_t *pud)
60{
61	if (!pgtable_l4_enabled())
62		return;
63	__pud_free(mm, pud);
64}
65#else
66static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
67{
68	BUILD_BUG();
69}
70#endif	/* CONFIG_PGTABLE_LEVELS > 3 */
71
72#if CONFIG_PGTABLE_LEVELS > 4
73
74static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
75{
76	if (pgtable_l5_enabled())
77		set_pgd(pgdp, __pgd(__phys_to_pgd_val(p4dp) | prot));
78}
79
80static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, p4d_t *p4dp)
81{
82	pgdval_t pgdval = PGD_TYPE_TABLE;
83
84	pgdval |= (mm == &init_mm) ? PGD_TABLE_UXN : PGD_TABLE_PXN;
85	__pgd_populate(pgdp, __pa(p4dp), pgdval);
86}
87
88static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
89{
90	gfp_t gfp = GFP_PGTABLE_USER;
91
92	if (mm == &init_mm)
93		gfp = GFP_PGTABLE_KERNEL;
94	return (p4d_t *)get_zeroed_page(gfp);
95}
96
97static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
98{
99	if (!pgtable_l5_enabled())
100		return;
101	BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
102	free_page((unsigned long)p4d);
103}
104
105#define __p4d_free_tlb(tlb, p4d, addr)  p4d_free((tlb)->mm, p4d)
106#else
107static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
108{
109	BUILD_BUG();
110}
111#endif	/* CONFIG_PGTABLE_LEVELS > 4 */
112
113extern pgd_t *pgd_alloc(struct mm_struct *mm);
114extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
115
116static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
117				  pmdval_t prot)
118{
119	set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
120}
121
122/*
123 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
124 * of the mm address space.
125 */
126static inline void
127pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
128{
129	VM_BUG_ON(mm && mm != &init_mm);
130	__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE | PMD_TABLE_UXN);
131}
132
133static inline void
134pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
135{
136	VM_BUG_ON(mm == &init_mm);
137	__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE | PMD_TABLE_PXN);
138}
139
140#endif
141