1 #ifndef _ASM_X86_PGALLOC_H
2 #define _ASM_X86_PGALLOC_H
4 #include <linux/threads.h>
5 #include <linux/mm.h> /* for struct page */
6 #include <linux/pagemap.h>
8 #include <asm/io.h> /* for phys_to_virt and page_to_pseudophys */
10 static inline int paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
11 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
13 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
14 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
15 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
16 unsigned long start, unsigned long count) {}
17 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
18 static inline void paravirt_release_pte(unsigned long pfn) {}
19 static inline void paravirt_release_pmd(unsigned long pfn) {}
20 static inline void paravirt_release_pud(unsigned long pfn) {}
23 void early_make_page_readonly(void *va, unsigned int feature);
24 pmd_t *early_get_pmd(unsigned long va);
25 #define make_lowmem_page_readonly make_page_readonly
26 #define make_lowmem_page_writable make_page_writable
30 * Flags to use when allocating a user page table page.
32 extern gfp_t __userpte_alloc_gfp;
35 * Allocate and free page tables.
37 extern pgd_t *pgd_alloc(struct mm_struct *);
38 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
40 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
41 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
43 /* Should really implement gc for free page table pages. This could be
44 done with a reference count in struct page. */
46 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
48 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
49 make_lowmem_page_writable(pte, XENFEAT_writable_page_tables);
50 free_page((unsigned long)pte);
53 extern void __pte_free(pgtable_t);
54 static inline void pte_free(struct mm_struct *mm, struct page *pte)
59 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
61 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
62 unsigned long address)
64 ___pte_free_tlb(tlb, pte);
67 static inline void pmd_populate_kernel(struct mm_struct *mm,
68 pmd_t *pmd, pte_t *pte)
70 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
71 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
74 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
77 unsigned long pfn = page_to_pfn(pte);
78 pmd_t ent = __pmd(((pmdval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE);
80 paravirt_alloc_pte(mm, pfn);
81 if (PagePinned(virt_to_page(pmd))) {
82 #ifndef CONFIG_HIGHPTE
83 BUG_ON(PageHighMem(pte));
90 #define pmd_pgtable(pmd) pmd_page(pmd)
92 #if PAGETABLE_LEVELS > 2
93 extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr);
94 extern void __pmd_free(pgtable_t);
96 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
98 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
99 __pmd_free(virt_to_page(pmd));
102 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
104 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
105 unsigned long address)
107 ___pmd_free_tlb(tlb, pmd);
110 #ifdef CONFIG_X86_PAE
111 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
112 #else /* !CONFIG_X86_PAE */
113 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
115 pud_t ent = __pud(_PAGE_TABLE | __pa(pmd));
117 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
118 if (PagePinned(virt_to_page(pud)))
123 #endif /* CONFIG_X86_PAE */
125 #if PAGETABLE_LEVELS > 3
126 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
128 pgd_t ent = __pgd(_PAGE_TABLE | __pa(pud));
130 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
131 if (unlikely(PagePinned(virt_to_page(pgd))))
132 xen_l4_entry_update(pgd, ent);
134 *__user_pgd(pgd) = *pgd = ent;
137 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
139 return (pud_t *)pmd_alloc_one(mm, addr);
142 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
144 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
145 __pmd_free(virt_to_page(pud));
148 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
150 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
151 unsigned long address)
153 ___pud_free_tlb(tlb, pud);
156 #endif /* PAGETABLE_LEVELS > 3 */
157 #endif /* PAGETABLE_LEVELS > 2 */
159 #endif /* _ASM_X86_PGALLOC_H */