/* * Based on arch/arm/include/asm/pgalloc.h * * Copyright (C) 2000-2001 Russell King * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program.  If not, see <http://www.gnu.org/licenses/>. */#ifndef __ASM_PGALLOC_H#define __ASM_PGALLOC_H #include <asm/pgtable-hwdef.h>#include <asm/processor.h>#include <asm/cacheflush.h>#include <asm/tlbflush.h> #define check_pgt_cache()		do { } while (0) #define PGALLOC_GFP	(GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)#define PGD_SIZE	(PTRS_PER_PGD * sizeof(pgd_t)) #if CONFIG_PGTABLE_LEVELS > 2 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr){	return (pmd_t *)__get_free_page(PGALLOC_GFP);} static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd){	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));	free_page((unsigned long)pmd);} static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot){	set_pud(pud, __pud(pmd | prot));} static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd){	__pud_populate(pud, __pa(pmd), PMD_TYPE_TABLE);}#elsestatic inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot){	BUILD_BUG();}#endif	/* CONFIG_PGTABLE_LEVELS > 2 */ #if CONFIG_PGTABLE_LEVELS > 3 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr){	return (pud_t *)__get_free_page(PGALLOC_GFP);} static inline void pud_free(struct mm_struct *mm, pud_t *pud){	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));	free_page((unsigned long)pud);} static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot){	set_pgd(pgdp, __pgd(pud | prot));} static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud){	__pgd_populate(pgd, __pa(pud), PUD_TYPE_TABLE);}#elsestatic inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot){	BUILD_BUG();}#endif	/* CONFIG_PGTABLE_LEVELS > 3 */ extern pgd_t *pgd_alloc(struct mm_struct *mm);extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr){	return (pte_t *)__get_free_page(PGALLOC_GFP);} static inline pgtable_tpte_alloc_one(struct mm_struct *mm, unsigned long addr){	struct page *pte; 	pte = alloc_pages(PGALLOC_GFP, 0);	if (!pte)		return NULL;	if (!pgtable_page_ctor(pte)) {		__free_page(pte);		return NULL;	}	return pte;} /* * Free a PTE table. */static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte){	if (pte)		free_page((unsigned long)pte);} static inline void pte_free(struct mm_struct *mm, pgtable_t pte){	pgtable_page_dtor(pte);	__free_page(pte);} static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,				  pmdval_t prot){	set_pmd(pmdp, __pmd(pte | prot));} /* * Populate the pmdp entry with a pointer to the pte.  This pmd is part * of the mm address space. */static inline voidpmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep){	/*	 * The pmd must be loaded with the physical address of the PTE table	 */	__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);} static inline voidpmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep){	__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);}#define pmd_pgtable(pmd) pmd_page(pmd) #endif