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73 lines
1.7 KiB
73 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_PGALLOC_H |
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#define _ASM_PGALLOC_H |
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#include <linux/gfp.h> |
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#include <linux/mm.h> |
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#include <linux/threads.h> |
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#include <asm/processor.h> |
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#include <asm/fixmap.h> |
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#include <asm/cache.h> |
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#define __HAVE_ARCH_PMD_ALLOC_ONE |
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#define __HAVE_ARCH_PMD_FREE |
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#define __HAVE_ARCH_PGD_FREE |
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#include <asm-generic/pgalloc.h> |
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/* Allocate the top level pgd (page directory) */ |
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static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
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{ |
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pgd_t *pgd; |
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pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); |
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if (unlikely(pgd == NULL)) |
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return NULL; |
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memset(pgd, 0, PAGE_SIZE << PGD_ORDER); |
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return pgd; |
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} |
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
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{ |
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free_pages((unsigned long)pgd, PGD_ORDER); |
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} |
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#if CONFIG_PGTABLE_LEVELS == 3 |
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/* Three Level Page Table Support for pmd's */ |
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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((PxD_FLAG_PRESENT | PxD_FLAG_VALID) + |
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(__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT))); |
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} |
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) |
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{ |
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pmd_t *pmd; |
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pmd = (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_TABLE_ORDER); |
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if (likely(pmd)) |
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memset ((void *)pmd, 0, PAGE_SIZE << PMD_TABLE_ORDER); |
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return pmd; |
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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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free_pages((unsigned long)pmd, PMD_TABLE_ORDER); |
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} |
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#endif |
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static inline void |
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) |
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{ |
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set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID) |
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+ (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT))); |
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} |
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#define pmd_populate(mm, pmd, pte_page) \ |
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pmd_populate_kernel(mm, pmd, page_address(pte_page)) |
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#endif
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