include/asm-mips64/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 by Ralf Baechle at alii
   7  * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
   8  */
   9 #ifndef _ASM_PGALLOC_H
  10 #define _ASM_PGALLOC_H
  11
  12 #include <linux/config.h>
  13 #include <linux/highmem.h>
  14 #include <linux/mm.h>
  15 #include <asm/page.h>
  16
  17 #define check_pgt_cache()       do { } while (0)
  18
  19 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  20         pte_t *pte)
  21 {
  22         set_pmd(pmd, __pmd((unsigned long)pte));
  23 }
  24
  25 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  26         struct page *pte)
  27 {
  28         set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  29 }
  30
  31 #define pgd_populate(mm, pgd, pmd)              set_pgd(pgd, __pgd(pmd))
  32
  33 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  34 {
  35         pgd_t *ret, *init;
  36
  37         ret = (pgd_t *) __get_free_pages(GFP_KERNEL, 1);
  38         if (ret) {
  39                 init = pgd_offset(&init_mm, 0);
  40                 pgd_init((unsigned long)ret);
  41                 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  42                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  43         }
  44
  45         return ret;
  46 }
  47
  48 static inline void pgd_free(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         pte_t *pte;
  57
  58         pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT,
  59                                          PTE_ORDER);
  60         if (pte)
  61                 clear_page(pte);
  62
  63         return pte;
  64 }
  65
  66 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  67         unsigned long address)
  68 {
  69         struct page *pte;
  70
  71         pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
  72         if (pte)
  73                 clear_highpage(pte);
  74
  75         return pte;
  76 }
  77
  78 static inline void pte_free_kernel(pte_t *pte)
  79 {
  80         free_pages((unsigned long)pte, PTE_ORDER);
  81 }
  82
  83 static inline void pte_free(struct page *pte)
  84 {
  85         __free_pages(pte, PTE_ORDER);
  86 }
  87
  88 #define __pte_free_tlb(tlb,pte)         tlb_remove_page((tlb),(pte))
  89 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  90
  91 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  92 {
  93         pmd_t *pmd;
  94
  95         pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
  96         if (pmd)
  97                 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
  98         return pmd;
  99 }
 100
 101 static inline void pmd_free(pmd_t *pmd)
 102 {
 103         free_pages((unsigned long)pmd, PMD_ORDER);
 104 }
 105
 106 extern pte_t kptbl[(PAGE_SIZE << PGD_ORDER)/sizeof(pte_t)];
 107 extern pmd_t kpmdtbl[PTRS_PER_PMD];
 108
 109 #endif /* _ASM_PGALLOC_H */