1 #ifndef _X86_64_PGALLOC_H
2 #define _X86_64_PGALLOC_H
4 #include <asm/processor.h>
5 #include <asm/fixmap.h>
7 #include <linux/threads.h>
9 #include <asm/io.h> /* for phys_to_virt and page_to_pseudophys */
11 void make_page_readonly(void *va);
12 void make_page_writable(void *va);
13 void make_pages_readonly(void *va, unsigned int nr);
14 void make_pages_writable(void *va, unsigned int nr);
16 #define __user_pgd(pgd) ((pgd) + PTRS_PER_PGD)
18 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
20 set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)));
23 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
25 set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
28 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
30 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
34 * We need to use the batch mode here, but pgd_pupulate() won't be
35 * be called frequently.
37 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
39 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
40 set_pgd(__user_pgd(pgd), __pgd(_PAGE_TABLE | __pa(pud)));
43 extern __inline__ pmd_t *get_pmd(void)
45 pmd_t *pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
48 make_page_readonly(pmd);
49 xen_pmd_pin(__pa(pmd));
53 extern __inline__ void pmd_free(pmd_t *pmd)
55 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
56 xen_pmd_unpin(__pa(pmd));
57 make_page_writable(pmd);
58 free_page((unsigned long)pmd);
61 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
63 pmd_t *pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
66 make_page_readonly(pmd);
67 xen_pmd_pin(__pa(pmd));
71 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
73 pud_t *pud = (pud_t *) get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
76 make_page_readonly(pud);
77 xen_pud_pin(__pa(pud));
81 static inline void pud_free(pud_t *pud)
83 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
84 xen_pud_unpin(__pa(pud));
85 make_page_writable(pud);
86 free_page((unsigned long)pud);
89 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
92 * We allocate two contiguous pages for kernel and user.
95 pgd_t *pgd = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_REPEAT, 1);
100 * Copy kernel pointers in from init.
101 * Could keep a freelist or slab cache of those because the kernel
102 * part never changes.
104 boundary = pgd_index(__PAGE_OFFSET);
105 memset(pgd, 0, boundary * sizeof(pgd_t));
106 memcpy(pgd + boundary,
107 init_level4_pgt + boundary,
108 (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
110 memset(__user_pgd(pgd), 0, PAGE_SIZE); /* clean up user pgd */
111 make_pages_readonly(pgd, 2);
113 xen_pgd_pin(__pa(pgd)); /* kernel */
114 xen_pgd_pin(__pa(__user_pgd(pgd))); /* user */
116 * Set level3_user_pgt for vsyscall area
118 set_pgd(__user_pgd(pgd) + pgd_index(VSYSCALL_START),
119 mk_kernel_pgd(__pa_symbol(level3_user_pgt)));
123 static inline void pgd_free(pgd_t *pgd)
125 BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
126 xen_pgd_unpin(__pa(pgd));
127 xen_pgd_unpin(__pa(__user_pgd(pgd)));
128 make_pages_writable(pgd, 2);
129 free_pages((unsigned long)pgd, 1);
132 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
134 pte_t *pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
137 make_page_readonly(pte);
138 xen_pte_pin(__pa(pte));
142 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
144 pte_t *pte = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
147 make_page_readonly(pte);
148 xen_pte_pin(__pa(pte));
149 return virt_to_page((unsigned long)pte);
152 /* Should really implement gc for free page table pages. This could be
153 done with a reference count in struct page. */
155 extern __inline__ void pte_free_kernel(pte_t *pte)
157 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
158 xen_pte_unpin(__pa(pte));
159 make_page_writable(pte);
160 free_page((unsigned long)pte);
163 extern void pte_free(struct page *pte);
165 //#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
167 #define __pte_free_tlb(tlb,x) pte_free((x))
168 #define __pmd_free_tlb(tlb,x) pmd_free((x))
169 #define __pud_free_tlb(tlb,x) pud_free((x))
171 #endif /* _X86_64_PGALLOC_H */