1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle 7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. 8 */ 9 #ifndef _ASM_PGALLOC_H 10 #define _ASM_PGALLOC_H 11 12 #include <linux/highmem.h> 13 #include <linux/mm.h> 14 #include <linux/sched.h> 15 16 #define __HAVE_ARCH_PMD_ALLOC_ONE 17 #define __HAVE_ARCH_PUD_ALLOC_ONE 18 #define __HAVE_ARCH_PGD_FREE 19 #include <asm-generic/pgalloc.h> 20 21 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 22 pte_t *pte) 23 { 24 set_pmd(pmd, __pmd((unsigned long)pte)); 25 } 26 27 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 28 pgtable_t pte) 29 { 30 set_pmd(pmd, __pmd((unsigned long)page_address(pte))); 31 } 32 33 /* 34 * Initialize a new pmd table with invalid pointers. 35 */ 36 extern void pmd_init(unsigned long page, unsigned long pagetable); 37 38 #ifndef __PAGETABLE_PMD_FOLDED 39 40 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 41 { 42 set_pud(pud, __pud((unsigned long)pmd)); 43 } 44 #endif 45 46 /* 47 * Initialize a new pgd / pmd table with invalid pointers. 48 */ 49 extern void pgd_init(unsigned long page); 50 extern pgd_t *pgd_alloc(struct mm_struct *mm); 51 52 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 53 { 54 free_pages((unsigned long)pgd, PGD_ORDER); 55 } 56 57 #define __pte_free_tlb(tlb,pte,address) \ 58 do { \ 59 pgtable_pte_page_dtor(pte); \ 60 tlb_remove_page((tlb), pte); \ 61 } while (0) 62 63 #ifndef __PAGETABLE_PMD_FOLDED 64 65 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) 66 { 67 pmd_t *pmd; 68 struct page *pg; 69 70 pg = alloc_pages(GFP_KERNEL_ACCOUNT, PMD_ORDER); 71 if (!pg) 72 return NULL; 73 74 if (!pgtable_pmd_page_ctor(pg)) { 75 __free_pages(pg, PMD_ORDER); 76 return NULL; 77 } 78 79 pmd = (pmd_t *)page_address(pg); 80 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table); 81 return pmd; 82 } 83 84 #define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x) 85 86 #endif 87 88 #ifndef __PAGETABLE_PUD_FOLDED 89 90 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) 91 { 92 pud_t *pud; 93 94 pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER); 95 if (pud) 96 pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table); 97 return pud; 98 } 99 100 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 101 { 102 set_p4d(p4d, __p4d((unsigned long)pud)); 103 } 104 105 #define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x) 106 107 #endif /* __PAGETABLE_PUD_FOLDED */ 108 109 extern void pagetable_init(void); 110 111 #endif /* _ASM_PGALLOC_H */ 112