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#ifndef _X86_64_PGALLOC_H #define _X86_64_PGALLOC_H #include <asm/fixmap.h> #include <asm/pda.h> #include <linux/threads.h> #include <linux/mm.h> #define pmd_populate_kernel(mm, pmd, pte) \ set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte))) #define pud_populate(mm, pud, pmd) \ set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))) #define pgd_populate(mm, pgd, pud) \ set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud))) static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte) { set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT))); } static inline pmd_t *get_pmd(void) { return (pmd_t *)get_zeroed_page(GFP_KERNEL); } static inline void pmd_free(pmd_t *pmd) { BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); free_page((unsigned long)pmd); } static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr) { return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); } static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) { return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); } static inline void pud_free (pud_t *pud) { BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); free_page((unsigned long)pud); } static inline pgd_t *pgd_alloc(struct mm_struct *mm) { unsigned boundary; pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT); if (!pgd) return NULL; /* * Copy kernel pointers in from init. * Could keep a freelist or slab cache of those because the kernel * part never changes. */ boundary = pgd_index(__PAGE_OFFSET); memset(pgd, 0, boundary * sizeof(pgd_t)); memcpy(pgd + boundary, init_level4_pgt + boundary, (PTRS_PER_PGD - boundary) * sizeof(pgd_t)); return pgd; } static inline void pgd_free(pgd_t *pgd) { BUG_ON((unsigned long)pgd & (PAGE_SIZE-1)); free_page((unsigned long)pgd); } static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) { return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); } static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) { void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); if (!p) return NULL; return virt_to_page(p); } /* Should really implement gc for free page table pages. This could be done with a reference count in struct page. */ static inline void pte_free_kernel(pte_t *pte) { BUG_ON((unsigned long)pte & (PAGE_SIZE-1)); free_page((unsigned long)pte); } static inline void pte_free(struct page *pte) { __free_page(pte); } #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) #define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x)) #define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x)) #endif /* _X86_64_PGALLOC_H */