diff options
Diffstat (limited to 'arch/parisc/include/asm/pgalloc.h')
-rw-r--r-- | arch/parisc/include/asm/pgalloc.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h new file mode 100644 index 0000000000..e3e142b1c5 --- /dev/null +++ b/arch/parisc/include/asm/pgalloc.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_PGALLOC_H +#define _ASM_PGALLOC_H + +#include <linux/gfp.h> +#include <linux/mm.h> +#include <linux/threads.h> +#include <asm/processor.h> +#include <asm/fixmap.h> + +#include <asm/cache.h> + +#define __HAVE_ARCH_PMD_ALLOC_ONE +#define __HAVE_ARCH_PMD_FREE +#define __HAVE_ARCH_PGD_FREE +#include <asm-generic/pgalloc.h> + +/* Allocate the top level pgd (page directory) */ +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *pgd; + + pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_TABLE_ORDER); + if (unlikely(pgd == NULL)) + return NULL; + + memset(pgd, 0, PAGE_SIZE << PGD_TABLE_ORDER); + + return pgd; +} + +static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ + free_pages((unsigned long)pgd, PGD_TABLE_ORDER); +} + +#if CONFIG_PGTABLE_LEVELS == 3 + +/* Three Level Page Table Support for pmd's */ + +static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) +{ + set_pud(pud, __pud((PxD_FLAG_PRESENT | PxD_FLAG_VALID) + + (__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT))); +} + +static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) +{ + pmd_t *pmd; + + pmd = (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_TABLE_ORDER); + if (likely(pmd)) + memset ((void *)pmd, 0, PAGE_SIZE << PMD_TABLE_ORDER); + return pmd; +} + +static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) +{ + free_pages((unsigned long)pmd, PMD_TABLE_ORDER); +} +#endif + +static inline void +pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) +{ + set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID) + + (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT))); +} + +#define pmd_populate(mm, pmd, pte_page) \ + pmd_populate_kernel(mm, pmd, page_address(pte_page)) + +#endif |