1/* 2 * linux/arch/unicore32/include/asm/pgalloc.h 3 * 4 * Code specific to PKUnity SoC and UniCore ISA 5 * 6 * Copyright (C) 2001-2010 GUAN Xue-tao 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12#ifndef __UNICORE_PGALLOC_H__ 13#define __UNICORE_PGALLOC_H__ 14 15#include <asm/pgtable-hwdef.h> 16#include <asm/processor.h> 17#include <asm/cacheflush.h> 18#include <asm/tlbflush.h> 19 20#define check_pgt_cache() do { } while (0) 21 22#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT) 23#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT) 24 25extern pgd_t *get_pgd_slow(struct mm_struct *mm); 26extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd); 27 28#define pgd_alloc(mm) get_pgd_slow(mm) 29#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd) 30 31#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO) 32 33/* 34 * Allocate one PTE table. 35 */ 36static inline pte_t * 37pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) 38{ 39 pte_t *pte; 40 41 pte = (pte_t *)__get_free_page(PGALLOC_GFP); 42 if (pte) 43 clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t)); 44 45 return pte; 46} 47 48static inline pgtable_t 49pte_alloc_one(struct mm_struct *mm, unsigned long addr) 50{ 51 struct page *pte; 52 53 pte = alloc_pages(PGALLOC_GFP, 0); 54 if (!pte) 55 return NULL; 56 if (!PageHighMem(pte)) { 57 void *page = page_address(pte); 58 clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t)); 59 } 60 if (!pgtable_page_ctor(pte)) { 61 __free_page(pte); 62 } 63 64 return pte; 65} 66 67/* 68 * Free one PTE table. 69 */ 70static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 71{ 72 if (pte) 73 free_page((unsigned long)pte); 74} 75 76static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 77{ 78 pgtable_page_dtor(pte); 79 __free_page(pte); 80} 81 82static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval) 83{ 84 set_pmd(pmdp, __pmd(pmdval)); 85 flush_pmd_entry(pmdp); 86} 87 88/* 89 * Populate the pmdp entry with a pointer to the pte. This pmd is part 90 * of the mm address space. 91 */ 92static inline void 93pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) 94{ 95 unsigned long pte_ptr = (unsigned long)ptep; 96 97 /* 98 * The pmd must be loaded with the physical 99 * address of the PTE table 100 */ 101 __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE); 102} 103 104static inline void 105pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) 106{ 107 __pmd_populate(pmdp, 108 page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE); 109} 110#define pmd_pgtable(pmd) pmd_page(pmd) 111 112#endif 113