arch/mips/include/asm/pgalloc.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
   7  * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
   8  */
   9 #ifndef _ASM_PGALLOC_H
  10 #define _ASM_PGALLOC_H
  11
  12 #include <linux/highmem.h>
  13 #include <linux/mm.h>
  14 #include <linux/sched.h>
  15
  16 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  17         pte_t *pte)
  18 {
  19         set_pmd(pmd, __pmd((unsigned long)pte));
  20 }
  21
  22 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  23         pgtable_t pte)
  24 {
  25         set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  26 }
  27 #define pmd_pgtable(pmd) pmd_page(pmd)
  28
  29 /*
  30  * Initialize a new pmd table with invalid pointers.
  31  */
  32 extern void pmd_init(unsigned long page, unsigned long pagetable);
  33
  34 #ifndef __PAGETABLE_PMD_FOLDED
  35
  36 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  37 {
  38         set_pud(pud, __pud((unsigned long)pmd));
  39 }
  40 #endif
  41
  42 /*
  43  * Initialize a new pgd / pmd table with invalid pointers.
  44  */
  45 extern void pgd_init(unsigned long page);
  46 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  47
  48 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  49 {
  50         free_pages((unsigned long)pgd, PGD_ORDER);
  51 }
  52
  53 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  54         unsigned long address)
  55 {
  56         return (pte_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER);
  57 }
  58
  59 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  60         unsigned long address)
  61 {
  62         struct page *pte;
  63
  64         pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
  65         if (!pte)
  66                 return NULL;
  67         clear_highpage(pte);
  68         if (!pgtable_page_ctor(pte)) {
  69                 __free_page(pte);
  70                 return NULL;
  71         }
  72         return pte;
  73 }
  74
  75 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  76 {
  77         free_pages((unsigned long)pte, PTE_ORDER);
  78 }
  79
  80 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  81 {
  82         pgtable_page_dtor(pte);
  83         __free_pages(pte, PTE_ORDER);
  84 }
  85
  86 #define __pte_free_tlb(tlb,pte,address)                 \
  87 do {                                                    \
  88         pgtable_page_dtor(pte);                         \
  89         tlb_remove_page((tlb), pte);                    \
  90 } while (0)
  91
  92 #ifndef __PAGETABLE_PMD_FOLDED
  93
  94 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  95 {
  96         pmd_t *pmd;
  97
  98         pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ORDER);
  99         if (pmd)
 100                 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 101         return pmd;
 102 }
 103
 104 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 105 {
 106         free_pages((unsigned long)pmd, PMD_ORDER);
 107 }
 108
 109 #define __pmd_free_tlb(tlb, x, addr)    pmd_free((tlb)->mm, x)
 110
 111 #endif
 112
 113 #define check_pgt_cache()       do { } while (0)
 114
 115 extern void pagetable_init(void);
 116
 117 #endif /* _ASM_PGALLOC_H */