/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. */ #ifndef _ASM_PGALLOC_H #define _ASM_PGALLOC_H #include <linux/config.h> #include <linux/highmem.h> #include <linux/mm.h> static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) { set_pmd(pmd, __pmd((unsigned long)pte)); } static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte) { set_pmd(pmd, __pmd((unsigned long)page_address(pte))); } /* * Initialize a new pgd / pmd table with invalid pointers. */ extern void pgd_init(unsigned long page); extern void pmd_init(unsigned long page, unsigned long pagetable); static inline pgd_t *pgd_alloc(struct mm_struct *mm) { pgd_t *ret, *init; ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); if (ret) { init = pgd_offset(&init_mm, 0); pgd_init((unsigned long)ret); memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); } return ret; } static inline void pgd_free(pgd_t *pgd) { free_pages((unsigned long)pgd, PGD_ORDER); } static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) { pte_t *pte; pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PTE_ORDER); if (pte) clear_page(pte); return pte; } static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) { struct page *pte; pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER); if (pte) clear_highpage(pte); return pte; } static inline void pte_free_kernel(pte_t *pte) { free_pages((unsigned long)pte, PTE_ORDER); } static inline void pte_free(struct page *pte) { __free_pages(pte, PTE_ORDER); } #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) #ifdef CONFIG_MIPS32 #define pgd_populate(mm, pmd, pte) BUG() /* * allocating and freeing a pmd is trivial: the 1-entry pmd is * inside the pgd, so has no extra memory associated with it. */ #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); }) #define pmd_free(x) do { } while (0) #define __pmd_free_tlb(tlb,x) do { } while (0) #endif #ifdef CONFIG_MIPS64 #define pgd_populate(mm, pgd, pmd) set_pgd(pgd, __pgd(pmd)) static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) { pmd_t *pmd; pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER); if (pmd) pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table); return pmd; } static inline void pmd_free(pmd_t *pmd) { free_pages((unsigned long)pmd, PMD_ORDER); } #define __pmd_free_tlb(tlb,x) pmd_free(x) #endif /* * Used for the b0rked handling of kernel pagetables on the 64-bit kernel. */ extern pte_t kptbl[(PAGE_SIZE << PGD_ORDER)/sizeof(pte_t)]; extern pmd_t kpmdtbl[PTRS_PER_PMD]; #define check_pgt_cache() do { } while (0) #endif /* _ASM_PGALLOC_H */