16  * allocate the first pmd adjacent to the pgd.  This means that we can
17  * subtract a constant offset to get to it.  The pmd and pgd sizes are
18  * arranged so that a single pmd covers 4GB (giving a full 64-bit
32 		/* Populate first pmd with allocated memory.  We mark it  in pgd_alloc()
34 		 * pmd entry may not be cleared. */  in pgd_alloc()
39 		/* The first pmd entry also is marked with PxD_FLAG_ATTACHED as  in pgd_alloc()
40 		 * a signal that this pmd may not be freed */  in pgd_alloc()
57 /* Three Level Page Table Support for pmd's */
59 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)  in pgd_populate()  argument
62 		        (__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT));  in pgd_populate()
67 	pmd_t *pmd = (pmd_t *)__get_free_pages(GFP_KERNEL, PMD_ORDER);  in pmd_alloc_one()  local
68 	if (pmd)  in pmd_alloc_one()
69 		memset(pmd, 0, PAGE_SIZE<<PMD_ORDER);  in pmd_alloc_one()
70 	return pmd;  in pmd_alloc_one()
73 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)  in pmd_free()  argument
75 	if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED) {  in pmd_free()
77 		 * This is the permanent pmd attached to the pgd;  in pmd_free()
85 	free_pages((unsigned long)pmd, PMD_ORDER);  in pmd_free()
90 /* Two Level Page Table Support for pmd's */
93  * allocating and freeing a pmd is trivial: the 1-entry pmd is
99 #define pgd_populate(mm, pmd, pte)	BUG()  argument
104 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)  in pmd_populate_kernel()  argument
108 	 * the permanent pmd */  in pmd_populate_kernel()
109 	if(pmd_flag(*pmd) & PxD_FLAG_ATTACHED)  in pmd_populate_kernel()
110 		__pmd_val_set(*pmd, (PxD_FLAG_PRESENT |  in pmd_populate_kernel()
116 		__pmd_val_set(*pmd, (PxD_FLAG_PRESENT | PxD_FLAG_VALID)   in pmd_populate_kernel()
120 #define pmd_populate(mm, pmd, pte_page) \  argument
121 	pmd_populate_kernel(mm, pmd, page_address(pte_page))
122 #define pmd_pgtable(pmd) pmd_page(pmd)  argument