1 #ifndef _X86_64_PGALLOC_H
2 #define _X86_64_PGALLOC_H
5 #include <linux/threads.h>
8 #define pmd_populate_kernel(mm, pmd, pte) \
9 set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
10 #define pud_populate(mm, pud, pmd) \
11 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)))
12 #define pgd_populate(mm, pgd, pud) \
13 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))
15 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
17 set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
20 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
22 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
23 free_page((unsigned long)pmd);
26 static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
28 return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
31 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
33 return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
36 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
38 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
39 free_page((unsigned long)pud);
42 static inline void pgd_list_add(pgd_t *pgd)
44 struct page *page = virt_to_page(pgd);
47 spin_lock_irqsave(&pgd_lock, flags);
48 list_add(&page->lru, &pgd_list);
49 spin_unlock_irqrestore(&pgd_lock, flags);
52 static inline void pgd_list_del(pgd_t *pgd)
54 struct page *page = virt_to_page(pgd);
57 spin_lock_irqsave(&pgd_lock, flags);
59 spin_unlock_irqrestore(&pgd_lock, flags);
62 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
65 pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
70 * Copy kernel pointers in from init.
71 * Could keep a freelist or slab cache of those because the kernel
74 boundary = pgd_index(__PAGE_OFFSET);
75 memset(pgd, 0, boundary * sizeof(pgd_t));
76 memcpy(pgd + boundary,
77 init_level4_pgt + boundary,
78 (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
82 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
84 BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
86 free_page((unsigned long)pgd);
89 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
91 return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
94 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
96 void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
99 return virt_to_page(p);
102 /* Should really implement gc for free page table pages. This could be
103 done with a reference count in struct page. */
105 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
107 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
108 free_page((unsigned long)pte);
111 static inline void pte_free(struct mm_struct *mm, struct page *pte)
116 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
118 #define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
119 #define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
121 #endif /* _X86_64_PGALLOC_H */