Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _X86_64_PGALLOC_H |
| 2 | #define _X86_64_PGALLOC_H |
| 3 | |
| 4 | #include <asm/fixmap.h> |
| 5 | #include <asm/pda.h> |
| 6 | #include <linux/threads.h> |
| 7 | #include <linux/mm.h> |
| 8 | |
| 9 | #define pmd_populate_kernel(mm, pmd, pte) \ |
| 10 | set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte))) |
| 11 | #define pud_populate(mm, pud, pmd) \ |
| 12 | set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))) |
| 13 | #define pgd_populate(mm, pgd, pud) \ |
| 14 | set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud))) |
| 15 | |
| 16 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte) |
| 17 | { |
| 18 | set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT))); |
| 19 | } |
| 20 | |
| 21 | extern __inline__ pmd_t *get_pmd(void) |
| 22 | { |
| 23 | return (pmd_t *)get_zeroed_page(GFP_KERNEL); |
| 24 | } |
| 25 | |
| 26 | extern __inline__ void pmd_free(pmd_t *pmd) |
| 27 | { |
| 28 | BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); |
| 29 | free_page((unsigned long)pmd); |
| 30 | } |
| 31 | |
| 32 | static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr) |
| 33 | { |
| 34 | return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); |
| 35 | } |
| 36 | |
| 37 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) |
| 38 | { |
| 39 | return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); |
| 40 | } |
| 41 | |
| 42 | static inline void pud_free (pud_t *pud) |
| 43 | { |
| 44 | BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); |
| 45 | free_page((unsigned long)pud); |
| 46 | } |
| 47 | |
| 48 | static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
| 49 | { |
| 50 | unsigned boundary; |
| 51 | pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT); |
| 52 | if (!pgd) |
| 53 | return NULL; |
| 54 | /* |
| 55 | * Copy kernel pointers in from init. |
| 56 | * Could keep a freelist or slab cache of those because the kernel |
| 57 | * part never changes. |
| 58 | */ |
| 59 | boundary = pgd_index(__PAGE_OFFSET); |
| 60 | memset(pgd, 0, boundary * sizeof(pgd_t)); |
| 61 | memcpy(pgd + boundary, |
| 62 | init_level4_pgt + boundary, |
| 63 | (PTRS_PER_PGD - boundary) * sizeof(pgd_t)); |
| 64 | return pgd; |
| 65 | } |
| 66 | |
| 67 | static inline void pgd_free(pgd_t *pgd) |
| 68 | { |
| 69 | BUG_ON((unsigned long)pgd & (PAGE_SIZE-1)); |
| 70 | free_page((unsigned long)pgd); |
| 71 | } |
| 72 | |
| 73 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) |
| 74 | { |
| 75 | return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); |
| 76 | } |
| 77 | |
| 78 | static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) |
| 79 | { |
| 80 | void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); |
| 81 | if (!p) |
| 82 | return NULL; |
| 83 | return virt_to_page(p); |
| 84 | } |
| 85 | |
| 86 | /* Should really implement gc for free page table pages. This could be |
| 87 | done with a reference count in struct page. */ |
| 88 | |
| 89 | extern __inline__ void pte_free_kernel(pte_t *pte) |
| 90 | { |
| 91 | BUG_ON((unsigned long)pte & (PAGE_SIZE-1)); |
| 92 | free_page((unsigned long)pte); |
| 93 | } |
| 94 | |
| 95 | extern inline void pte_free(struct page *pte) |
| 96 | { |
| 97 | __free_page(pte); |
| 98 | } |
| 99 | |
| 100 | #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) |
| 101 | |
| 102 | #define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x)) |
| 103 | #define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x)) |
| 104 | |
| 105 | #endif /* _X86_64_PGALLOC_H */ |