155 lines
3.3 KiB
C
155 lines
3.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* arch/arm/include/asm/pgalloc.h
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*
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* Copyright (C) 2000-2001 Russell King
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*/
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#ifndef _ASMARM_PGALLOC_H
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#define _ASMARM_PGALLOC_H
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#include <linux/pagemap.h>
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#include <asm/domain.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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#ifdef CONFIG_MMU
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#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
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#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
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#ifdef CONFIG_ARM_LPAE
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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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return (pmd_t *)get_zeroed_page(GFP_KERNEL);
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}
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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{
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BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
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free_page((unsigned long)pmd);
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}
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static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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{
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set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
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}
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#else /* !CONFIG_ARM_LPAE */
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/*
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* Since we have only two-level page tables, these are trivial
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*/
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#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
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#define pmd_free(mm, pmd) do { } while (0)
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#define pud_populate(mm,pmd,pte) BUG()
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#endif /* CONFIG_ARM_LPAE */
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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 *pgd);
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static inline void clean_pte_table(pte_t *pte)
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{
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clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
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}
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/*
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* Allocate one PTE table.
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*
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* This actually allocates two hardware PTE tables, but we wrap this up
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* into one table thus:
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*
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* +------------+
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* | Linux pt 0 |
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* +------------+
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* | Linux pt 1 |
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* +------------+
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* | h/w pt 0 |
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* +------------+
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* | h/w pt 1 |
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* +------------+
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*/
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#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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#define __HAVE_ARCH_PTE_ALLOC_ONE
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#include <asm-generic/pgalloc.h>
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static inline pte_t *
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pte_alloc_one_kernel(struct mm_struct *mm)
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{
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pte_t *pte = __pte_alloc_one_kernel(mm);
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if (pte)
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clean_pte_table(pte);
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return pte;
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}
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#ifdef CONFIG_HIGHPTE
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#define PGTABLE_HIGHMEM __GFP_HIGHMEM
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#else
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#define PGTABLE_HIGHMEM 0
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#endif
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static inline pgtable_t
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pte_alloc_one(struct mm_struct *mm)
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{
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struct page *pte;
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pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM);
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if (!pte)
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return NULL;
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if (!PageHighMem(pte))
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clean_pte_table(page_address(pte));
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return pte;
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}
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static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
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pmdval_t prot)
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{
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pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
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pmdp[0] = __pmd(pmdval);
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#ifndef CONFIG_ARM_LPAE
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pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
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#endif
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flush_pmd_entry(pmdp);
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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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* Ensure that we always set both PMD entries.
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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), _PAGE_KERNEL_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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extern pmdval_t user_pmd_table;
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pmdval_t prot;
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if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
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prot = user_pmd_table;
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else
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prot = _PAGE_USER_TABLE;
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__pmd_populate(pmdp, page_to_phys(ptep), prot);
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#endif /* CONFIG_MMU */
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#endif
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