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Diffstat (limited to '')
-rw-r--r-- | arch/nds32/include/asm/pgalloc.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/nds32/include/asm/pgalloc.h b/arch/nds32/include/asm/pgalloc.h new file mode 100644 index 000000000..85c117347 --- /dev/null +++ b/arch/nds32/include/asm/pgalloc.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2005-2017 Andes Technology Corporation + +#ifndef _ASMNDS32_PGALLOC_H +#define _ASMNDS32_PGALLOC_H + +#include <asm/processor.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> +#include <asm/proc-fns.h> + +#define __HAVE_ARCH_PTE_ALLOC_ONE +#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */ + +/* + * Since we have only two-level page tables, these are trivial + */ +#define pmd_pgtable(pmd) pmd_page(pmd) + +extern pgd_t *pgd_alloc(struct mm_struct *mm); +extern void pgd_free(struct mm_struct *mm, pgd_t * pgd); + +static inline pgtable_t pte_alloc_one(struct mm_struct *mm) +{ + pgtable_t pte; + + pte = __pte_alloc_one(mm, GFP_PGTABLE_USER); + if (pte) + cpu_dcache_wb_page((unsigned long)page_address(pte)); + + return pte; +} + +/* + * Populate the pmdp entry with a pointer to the pte. This pmd is part + * of the mm address space. + * + * Ensure that we always set both PMD entries. + */ +static inline void +pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep) +{ + unsigned long pte_ptr = (unsigned long)ptep; + unsigned long pmdval; + + BUG_ON(mm != &init_mm); + + /* + * The pmd must be loaded with the physical + * address of the PTE table + */ + pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE; + set_pmd(pmdp, __pmd(pmdval)); +} + +static inline void +pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep) +{ + unsigned long pmdval; + + BUG_ON(mm == &init_mm); + + pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE; + set_pmd(pmdp, __pmd(pmdval)); +} + +#endif |