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Linux/arch/arm/include/asm/pgalloc.h

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  1 /*
  2  *  arch/arm/include/asm/pgalloc.h
  3  *
  4  *  Copyright (C) 2000-2001 Russell King
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #ifndef _ASMARM_PGALLOC_H
 11 #define _ASMARM_PGALLOC_H
 12 
 13 #include <linux/pagemap.h>
 14 
 15 #include <asm/domain.h>
 16 #include <asm/pgtable-hwdef.h>
 17 #include <asm/processor.h>
 18 #include <asm/cacheflush.h>
 19 #include <asm/tlbflush.h>
 20 
 21 #define check_pgt_cache()               do { } while (0)
 22 
 23 #ifdef CONFIG_MMU
 24 
 25 #define _PAGE_USER_TABLE        (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
 26 #define _PAGE_KERNEL_TABLE      (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
 27 
 28 #ifdef CONFIG_ARM_LPAE
 29 
 30 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 31 {
 32         return (pmd_t *)get_zeroed_page(GFP_KERNEL);
 33 }
 34 
 35 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 36 {
 37         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
 38         free_page((unsigned long)pmd);
 39 }
 40 
 41 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 42 {
 43         set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
 44 }
 45 
 46 #else   /* !CONFIG_ARM_LPAE */
 47 
 48 /*
 49  * Since we have only two-level page tables, these are trivial
 50  */
 51 #define pmd_alloc_one(mm,addr)          ({ BUG(); ((pmd_t *)2); })
 52 #define pmd_free(mm, pmd)               do { } while (0)
 53 #define pud_populate(mm,pmd,pte)        BUG()
 54 
 55 #endif  /* CONFIG_ARM_LPAE */
 56 
 57 extern pgd_t *pgd_alloc(struct mm_struct *mm);
 58 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 59 
 60 #define PGALLOC_GFP     (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
 61 
 62 static inline void clean_pte_table(pte_t *pte)
 63 {
 64         clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
 65 }
 66 
 67 /*
 68  * Allocate one PTE table.
 69  *
 70  * This actually allocates two hardware PTE tables, but we wrap this up
 71  * into one table thus:
 72  *
 73  *  +------------+
 74  *  | Linux pt 0 |
 75  *  +------------+
 76  *  | Linux pt 1 |
 77  *  +------------+
 78  *  |  h/w pt 0  |
 79  *  +------------+
 80  *  |  h/w pt 1  |
 81  *  +------------+
 82  */
 83 static inline pte_t *
 84 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
 85 {
 86         pte_t *pte;
 87 
 88         pte = (pte_t *)__get_free_page(PGALLOC_GFP);
 89         if (pte)
 90                 clean_pte_table(pte);
 91 
 92         return pte;
 93 }
 94 
 95 static inline pgtable_t
 96 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
 97 {
 98         struct page *pte;
 99 
100 #ifdef CONFIG_HIGHPTE
101         pte = alloc_pages(PGALLOC_GFP | __GFP_HIGHMEM, 0);
102 #else
103         pte = alloc_pages(PGALLOC_GFP, 0);
104 #endif
105         if (!pte)
106                 return NULL;
107         if (!PageHighMem(pte))
108                 clean_pte_table(page_address(pte));
109         if (!pgtable_page_ctor(pte)) {
110                 __free_page(pte);
111                 return NULL;
112         }
113         return pte;
114 }
115 
116 /*
117  * Free one PTE table.
118  */
119 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
120 {
121         if (pte)
122                 free_page((unsigned long)pte);
123 }
124 
125 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
126 {
127         pgtable_page_dtor(pte);
128         __free_page(pte);
129 }
130 
131 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
132                                   pmdval_t prot)
133 {
134         pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
135         pmdp[0] = __pmd(pmdval);
136 #ifndef CONFIG_ARM_LPAE
137         pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
138 #endif
139         flush_pmd_entry(pmdp);
140 }
141 
142 /*
143  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
144  * of the mm address space.
145  *
146  * Ensure that we always set both PMD entries.
147  */
148 static inline void
149 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
150 {
151         /*
152          * The pmd must be loaded with the physical address of the PTE table
153          */
154         __pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
155 }
156 
157 static inline void
158 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
159 {
160         extern pmdval_t user_pmd_table;
161         pmdval_t prot;
162 
163         if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
164                 prot = user_pmd_table;
165         else
166                 prot = _PAGE_USER_TABLE;
167 
168         __pmd_populate(pmdp, page_to_phys(ptep), prot);
169 }
170 #define pmd_pgtable(pmd) pmd_page(pmd)
171 
172 #endif /* CONFIG_MMU */
173 
174 #endif
175 

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