| /* |
| * Based on arch/arm/include/asm/pgalloc.h |
| * |
| * Copyright (C) 2000-2001 Russell King |
| * Copyright (C) 2012 ARM Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| #ifndef __ASM_PGALLOC_H |
| #define __ASM_PGALLOC_H |
| |
| #include <asm/pgtable-hwdef.h> |
| #include <asm/processor.h> |
| #include <asm/cacheflush.h> |
| #include <asm/tlbflush.h> |
| |
| #define check_pgt_cache() do { } while (0) |
| |
| #define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO) |
| |
| #if CONFIG_ARM64_PGTABLE_LEVELS > 2 |
| |
| static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) |
| { |
| return (pmd_t *)__get_free_page(PGALLOC_GFP); |
| } |
| |
| static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) |
| { |
| BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); |
| free_page((unsigned long)pmd); |
| } |
| |
| static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
| { |
| set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE)); |
| } |
| |
| #endif /* CONFIG_ARM64_PGTABLE_LEVELS > 2 */ |
| |
| #if CONFIG_ARM64_PGTABLE_LEVELS > 3 |
| |
| static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) |
| { |
| return (pud_t *)__get_free_page(PGALLOC_GFP); |
| } |
| |
| static inline void pud_free(struct mm_struct *mm, pud_t *pud) |
| { |
| BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); |
| free_page((unsigned long)pud); |
| } |
| |
| static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) |
| { |
| set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE)); |
| } |
| |
| #endif /* CONFIG_ARM64_PGTABLE_LEVELS > 3 */ |
| |
| extern pgd_t *pgd_alloc(struct mm_struct *mm); |
| extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); |
| |
| static inline pte_t * |
| pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) |
| { |
| return (pte_t *)__get_free_page(PGALLOC_GFP); |
| } |
| |
| static inline pgtable_t |
| pte_alloc_one(struct mm_struct *mm, unsigned long addr) |
| { |
| struct page *pte; |
| |
| pte = alloc_pages(PGALLOC_GFP, 0); |
| if (!pte) |
| return NULL; |
| if (!pgtable_page_ctor(pte)) { |
| __free_page(pte); |
| return NULL; |
| } |
| return pte; |
| } |
| |
| /* |
| * Free a PTE table. |
| */ |
| static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
| { |
| if (pte) |
| free_page((unsigned long)pte); |
| } |
| |
| static inline void pte_free(struct mm_struct *mm, pgtable_t pte) |
| { |
| pgtable_page_dtor(pte); |
| __free_page(pte); |
| } |
| |
| static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte, |
| pmdval_t prot) |
| { |
| set_pmd(pmdp, __pmd(pte | prot)); |
| } |
| |
| /* |
| * Populate the pmdp entry with a pointer to the pte. This pmd is part |
| * of the mm address space. |
| */ |
| static inline void |
| pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) |
| { |
| /* |
| * The pmd must be loaded with the physical address of the PTE table |
| */ |
| __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE); |
| } |
| |
| static inline void |
| pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) |
| { |
| __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE); |
| } |
| #define pmd_pgtable(pmd) pmd_page(pmd) |
| |
| #endif |