1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 *  arch/arm/include/asm/pgalloc.h
  4 *
  5 *  Copyright (C) 2000-2001 Russell King
  6 */
  7#ifndef _ASMARM_PGALLOC_H
  8#define _ASMARM_PGALLOC_H
  9
 10#include <linux/pagemap.h>
 11
 12#include <asm/domain.h>
 13#include <asm/pgtable-hwdef.h>
 14#include <asm/processor.h>
 15#include <asm/cacheflush.h>
 16#include <asm/tlbflush.h>
 17
 18#ifdef CONFIG_MMU
 19
 20#define _PAGE_USER_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
 21#define _PAGE_KERNEL_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
 22
 23#ifdef CONFIG_ARM_LPAE
 24#define PGD_SIZE		(PTRS_PER_PGD * sizeof(pgd_t))
 25
 26static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 27{
 28	set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
 29}
 30
 31#else	/* !CONFIG_ARM_LPAE */
 32#define PGD_SIZE		(PAGE_SIZE << 2)
 33
 34/*
 35 * Since we have only two-level page tables, these are trivial
 36 */
 37#define pmd_alloc_one(mm,addr)		({ BUG(); ((pmd_t *)2); })
 38#define pmd_free(mm, pmd)		do { } while (0)
 39#ifdef CONFIG_KASAN
 40/* The KASan core unconditionally calls pud_populate() on all architectures */
 41#define pud_populate(mm,pmd,pte)	do { } while (0)
 42#else
 43#define pud_populate(mm,pmd,pte)	BUG()
 44#endif
 45#endif	/* CONFIG_ARM_LPAE */
 46
 47extern pgd_t *pgd_alloc(struct mm_struct *mm);
 48extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 49
 50static inline void clean_pte_table(pte_t *pte)
 51{
 52	clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
 53}
 54
 55/*
 56 * Allocate one PTE table.
 57 *
 58 * This actually allocates two hardware PTE tables, but we wrap this up
 59 * into one table thus:
 60 *
 61 *  +------------+
 62 *  | Linux pt 0 |
 63 *  +------------+
 64 *  | Linux pt 1 |
 65 *  +------------+
 66 *  |  h/w pt 0  |
 67 *  +------------+
 68 *  |  h/w pt 1  |
 69 *  +------------+
 70 */
 71
 72#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
 73#define __HAVE_ARCH_PTE_ALLOC_ONE
 74#define __HAVE_ARCH_PGD_FREE
 75#include <asm-generic/pgalloc.h>
 76
 77static inline pte_t *
 78pte_alloc_one_kernel(struct mm_struct *mm)
 79{
 80	pte_t *pte = __pte_alloc_one_kernel(mm);
 81
 82	if (pte)
 83		clean_pte_table(pte);
 84
 85	return pte;
 86}
 87
 88#ifdef CONFIG_HIGHPTE
 89#define PGTABLE_HIGHMEM __GFP_HIGHMEM
 90#else
 91#define PGTABLE_HIGHMEM 0
 92#endif
 93
 94static inline pgtable_t
 95pte_alloc_one(struct mm_struct *mm)
 96{
 97	struct page *pte;
 98
 99	pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM);
100	if (!pte)
101		return NULL;
102	if (!PageHighMem(pte))
103		clean_pte_table(page_address(pte));
104	return pte;
105}
106
107static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
108				  pmdval_t prot)
109{
110	pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
111	pmdp[0] = __pmd(pmdval);
112#ifndef CONFIG_ARM_LPAE
113	pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
114#endif
115	flush_pmd_entry(pmdp);
116}
117
118/*
119 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
120 * of the mm address space.
121 *
122 * Ensure that we always set both PMD entries.
123 */
124static inline void
125pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
126{
127	/*
128	 * The pmd must be loaded with the physical address of the PTE table
129	 */
130	__pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
131}
132
133static inline void
134pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
135{
136	extern pmdval_t user_pmd_table;
137	pmdval_t prot;
138
139	if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
140		prot = user_pmd_table;
141	else
142		prot = _PAGE_USER_TABLE;
143
144	__pmd_populate(pmdp, page_to_phys(ptep), prot);
145}
 
146
147#endif /* CONFIG_MMU */
148
149#endif

  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 *  arch/arm/include/asm/pgalloc.h
  4 *
  5 *  Copyright (C) 2000-2001 Russell King
  6 */
  7#ifndef _ASMARM_PGALLOC_H
  8#define _ASMARM_PGALLOC_H
  9
 10#include <linux/pagemap.h>
 11
 12#include <asm/domain.h>
 13#include <asm/pgtable-hwdef.h>
 14#include <asm/processor.h>
 15#include <asm/cacheflush.h>
 16#include <asm/tlbflush.h>
 17
 18#ifdef CONFIG_MMU
 19
 20#define _PAGE_USER_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
 21#define _PAGE_KERNEL_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
 22
 23#ifdef CONFIG_ARM_LPAE
 
 24
 25static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 26{
 27	set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
 28}
 29
 30#else	/* !CONFIG_ARM_LPAE */
 
 31
 32/*
 33 * Since we have only two-level page tables, these are trivial
 34 */
 35#define pmd_alloc_one(mm,addr)		({ BUG(); ((pmd_t *)2); })
 36#define pmd_free(mm, pmd)		do { } while (0)
 
 
 
 
 37#define pud_populate(mm,pmd,pte)	BUG()
 38
 39#endif	/* CONFIG_ARM_LPAE */
 40
 41extern pgd_t *pgd_alloc(struct mm_struct *mm);
 42extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 43
 44static inline void clean_pte_table(pte_t *pte)
 45{
 46	clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
 47}
 48
 49/*
 50 * Allocate one PTE table.
 51 *
 52 * This actually allocates two hardware PTE tables, but we wrap this up
 53 * into one table thus:
 54 *
 55 *  +------------+
 56 *  | Linux pt 0 |
 57 *  +------------+
 58 *  | Linux pt 1 |
 59 *  +------------+
 60 *  |  h/w pt 0  |
 61 *  +------------+
 62 *  |  h/w pt 1  |
 63 *  +------------+
 64 */
 65
 66#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
 67#define __HAVE_ARCH_PTE_ALLOC_ONE
 68#define __HAVE_ARCH_PGD_FREE
 69#include <asm-generic/pgalloc.h>
 70
 71static inline pte_t *
 72pte_alloc_one_kernel(struct mm_struct *mm)
 73{
 74	pte_t *pte = __pte_alloc_one_kernel(mm);
 75
 76	if (pte)
 77		clean_pte_table(pte);
 78
 79	return pte;
 80}
 81
 82#ifdef CONFIG_HIGHPTE
 83#define PGTABLE_HIGHMEM __GFP_HIGHMEM
 84#else
 85#define PGTABLE_HIGHMEM 0
 86#endif
 87
 88static inline pgtable_t
 89pte_alloc_one(struct mm_struct *mm)
 90{
 91	struct page *pte;
 92
 93	pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM);
 94	if (!pte)
 95		return NULL;
 96	if (!PageHighMem(pte))
 97		clean_pte_table(page_address(pte));
 98	return pte;
 99}
100
101static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
102				  pmdval_t prot)
103{
104	pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
105	pmdp[0] = __pmd(pmdval);
106#ifndef CONFIG_ARM_LPAE
107	pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
108#endif
109	flush_pmd_entry(pmdp);
110}
111
112/*
113 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
114 * of the mm address space.
115 *
116 * Ensure that we always set both PMD entries.
117 */
118static inline void
119pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
120{
121	/*
122	 * The pmd must be loaded with the physical address of the PTE table
123	 */
124	__pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
125}
126
127static inline void
128pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
129{
130	extern pmdval_t user_pmd_table;
131	pmdval_t prot;
132
133	if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
134		prot = user_pmd_table;
135	else
136		prot = _PAGE_USER_TABLE;
137
138	__pmd_populate(pmdp, page_to_phys(ptep), prot);
139}
140#define pmd_pgtable(pmd) pmd_page(pmd)
141
142#endif /* CONFIG_MMU */
143
144#endif