1 #ifndef _X86_64_PGALLOC_H
2 #define _X86_64_PGALLOC_H
4 #include <asm/fixmap.h>
6 #include <linux/threads.h>
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)))
16 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
18 set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
21 static inline pmd_t *get_pmd(void)
23 return (pmd_t *)get_zeroed_page(GFP_KERNEL);
26 static inline void pmd_free(pmd_t *pmd)
28 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
29 free_page((unsigned long)pmd);
32 static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
34 return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
37 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
39 return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
42 static inline void pud_free (pud_t *pud)
44 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
45 free_page((unsigned long)pud);
48 static inline void pgd_list_add(pgd_t *pgd)
50 struct page *page = virt_to_page(pgd);
53 page->index = (pgoff_t)pgd_list;
55 pgd_list->private = (unsigned long)&page->index;
57 page->private = (unsigned long)&pgd_list;
58 spin_unlock(&pgd_lock);
61 static inline void pgd_list_del(pgd_t *pgd)
63 struct page *next, **pprev, *page = virt_to_page(pgd);
66 next = (struct page *)page->index;
67 pprev = (struct page **)page->private;
70 next->private = (unsigned long)pprev;
71 spin_unlock(&pgd_lock);
74 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
77 pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
82 * Copy kernel pointers in from init.
83 * Could keep a freelist or slab cache of those because the kernel
86 boundary = pgd_index(__PAGE_OFFSET);
87 memset(pgd, 0, boundary * sizeof(pgd_t));
88 memcpy(pgd + boundary,
89 init_level4_pgt + boundary,
90 (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
94 static inline void pgd_free(pgd_t *pgd)
96 BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
98 free_page((unsigned long)pgd);
101 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
103 return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
106 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
108 void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
111 return virt_to_page(p);
114 /* Should really implement gc for free page table pages. This could be
115 done with a reference count in struct page. */
117 static inline void pte_free_kernel(pte_t *pte)
119 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
120 free_page((unsigned long)pte);
123 static inline void pte_free(struct page *pte)
128 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
130 #define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
131 #define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
133 #endif /* _X86_64_PGALLOC_H */