1 /* 2 * include/asm-xtensa/pgalloc.h 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * Copyright (C) 2001-2007 Tensilica Inc. 9 */ 10 11 #ifndef _XTENSA_PGALLOC_H 12 #define _XTENSA_PGALLOC_H 13 14 #ifdef __KERNEL__ 15 16 #include <linux/highmem.h> 17 18 /* 19 * Allocating and freeing a pmd is trivial: the 1-entry pmd is 20 * inside the pgd, so has no extra memory associated with it. 21 */ 22 23 #define pmd_populate_kernel(mm, pmdp, ptep) \ 24 (pmd_val(*(pmdp)) = ((unsigned long)ptep)) 25 #define pmd_populate(mm, pmdp, page) \ 26 (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page))) 27 #define pmd_pgtable(pmd) pmd_page(pmd) 28 29 static inline pgd_t* 30 pgd_alloc(struct mm_struct *mm) 31 { 32 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER); 33 } 34 35 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 36 { 37 free_page((unsigned long)pgd); 38 } 39 40 /* Use a slab cache for the pte pages (see also sparc64 implementation) */ 41 42 extern struct kmem_cache *pgtable_cache; 43 44 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 45 unsigned long address) 46 { 47 return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT); 48 } 49 50 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 51 unsigned long addr) 52 { 53 struct page *page; 54 55 page = virt_to_page(pte_alloc_one_kernel(mm, addr)); 56 pgtable_page_ctor(page); 57 return page; 58 } 59 60 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 61 { 62 kmem_cache_free(pgtable_cache, pte); 63 } 64 65 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 66 { 67 pgtable_page_dtor(pte); 68 kmem_cache_free(pgtable_cache, page_address(pte)); 69 } 70 #define pmd_pgtable(pmd) pmd_page(pmd) 71 72 #endif /* __KERNEL__ */ 73 #endif /* _XTENSA_PGALLOC_H */ 74