| 1 | |
| 2 | *
|
| 3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
| 4 | * Written by David Howells ([email protected])
|
| 5 | *
|
| 6 | * This program is free software; you can redistribute it and/or
|
| 7 | * modify it under the terms of the GNU General Public License
|
| 8 | * as published by the Free Software Foundation; either version
|
| 9 | * 2 of the License, or (at your option) any later version.
|
| 10 | *
|
| 11 | * Derived from:
|
| 12 | * include/asm-m68knommu/pgalloc.h
|
| 13 | * include/asm-i386/pgalloc.h
|
| 14 |
|
| 15 | #ifndef _ASM_PGALLOC_H
|
| 16 | #define _ASM_PGALLOC_H
|
| 17 |
|
| 18 | #include <asm/setup.h>
|
| 19 | #include <asm/virtconvert.h>
|
| 20 |
|
| 21 | #ifdef CONFIG_MMU
|
| 22 |
|
| 23 | #define pmd_populate_kernel(mm, pmd, pte) __set_pmd(pmd, __pa(pte) | _PAGE_TABLE)
|
| 24 | #define pmd_populate(MM, PMD, PAGE) \
|
| 25 | do { \
|
| 26 | __set_pmd((PMD), page_to_pfn(PAGE) << PAGE_SHIFT | _PAGE_TABLE); \
|
| 27 | } while(0)
|
| 28 |
|
| 29 | |
| 30 | * Allocate and free page tables.
|
| 31 |
|
| 32 |
|
| 33 | extern pgd_t *pgd_alloc(struct mm_struct *);
|
| 34 | extern void pgd_free(pgd_t *);
|
| 35 |
|
| 36 | extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
|
| 37 |
|
| 38 | extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
|
| 39 |
|
| 40 | static inline void pte_free_kernel(pte_t *pte)
|
| 41 | {
|
| 42 | free_page((unsigned long)pte);
|
| 43 | }
|
| 44 |
|
| 45 | static inline void pte_free(struct page *pte)
|
| 46 | {
|
| 47 | __free_page(pte);
|
| 48 | }
|
| 49 |
|
| 50 | #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
|
| 51 |
|
| 52 | |
| 53 | * allocating and freeing a pmd is trivial: the 1-entry pmd is
|
| 54 | * inside the pgd, so has no extra memory associated with it.
|
| 55 | * (In the PAE case we free the pmds as part of the pgd.)
|
| 56 |
|
| 57 | #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *) 2); })
|
| 58 | #define pmd_free(x) do { } while (0)
|
| 59 | #define __pmd_free_tlb(tlb,x) do { } while (0)
|
| 60 |
|
| 61 | #endif
|
| 62 |
|
| 63 | #endif
|