122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/include/asm/pgalloc.h
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*
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* Copyright (C) 2000-2001 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_PGALLOC_H
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#define __ASM_PGALLOC_H
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#include <asm/pgtable-hwdef.h>
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#include <asm/processor.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
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#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
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#if CONFIG_PGTABLE_LEVELS > 2
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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gfp_t gfp = GFP_PGTABLE_USER;
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struct page *page;
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if (mm == &init_mm)
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gfp = GFP_PGTABLE_KERNEL;
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page = alloc_page(gfp);
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if (!page)
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return NULL;
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if (!pgtable_pmd_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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return page_address(page);
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}
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
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{
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BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
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pgtable_pmd_page_dtor(virt_to_page(pmdp));
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free_page((unsigned long)pmdp);
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}
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static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
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{
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set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
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}
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static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
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{
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__pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
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}
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#else
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static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
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{
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BUILD_BUG();
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}
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#endif /* CONFIG_PGTABLE_LEVELS > 2 */
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#if CONFIG_PGTABLE_LEVELS > 3
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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return (pud_t *)__get_free_page(GFP_PGTABLE_USER);
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}
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static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
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{
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BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
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free_page((unsigned long)pudp);
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}
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static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
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{
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set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
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}
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static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
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{
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__pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
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}
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#else
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static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
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{
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BUILD_BUG();
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}
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#endif /* CONFIG_PGTABLE_LEVELS > 3 */
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extern pgd_t *pgd_alloc(struct mm_struct *mm);
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extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
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static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
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pmdval_t prot)
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{
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set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
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}
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/*
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* Populate the pmdp entry with a pointer to the pte. This pmd is part
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* of the mm address space.
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*/
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static inline void
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
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{
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/*
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* The pmd must be loaded with the physical address of the PTE table
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*/
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__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
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}
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static inline void
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pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
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{
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__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#endif
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