include/asm-sh64/pgalloc.h

   1 #ifndef __ASM_SH64_PGALLOC_H
   2 #define __ASM_SH64_PGALLOC_H
   3
   4 /*
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * include/asm-sh64/pgalloc.h
  10  *
  11  * Copyright (C) 2000, 2001  Paolo Alberelli
  12  * Copyright (C) 2003, 2004  Paul Mundt
  13  * Copyright (C) 2003, 2004  Richard Curnow
  14  *
  15  */
  16
  17 #include <linux/threads.h>
  18 #include <linux/mm.h>
  19
  20 #define pgd_quicklist (current_cpu_data.pgd_quick)
  21 #define pmd_quicklist (current_cpu_data.pmd_quick)
  22 #define pte_quicklist (current_cpu_data.pte_quick)
  23 #define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)
  24
  25 static inline void pgd_init(unsigned long page)
  26 {
  27         unsigned long *pgd = (unsigned long *)page;
  28         extern pte_t empty_bad_pte_table[PTRS_PER_PTE];
  29         int i;
  30
  31         for (i = 0; i < USER_PTRS_PER_PGD; i++)
  32                 pgd[i] = (unsigned long)empty_bad_pte_table;
  33 }
  34
  35 /*
  36  * Allocate and free page tables. The xxx_kernel() versions are
  37  * used to allocate a kernel page table - this turns on ASN bits
  38  * if any.
  39  */
  40
  41 static inline pgd_t *get_pgd_slow(void)
  42 {
  43         unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t));
  44         pgd_t *ret = kmalloc(pgd_size, GFP_KERNEL);
  45         return ret;
  46 }
  47
  48 static inline pgd_t *get_pgd_fast(void)
  49 {
  50         unsigned long *ret;
  51
  52         if ((ret = pgd_quicklist) != NULL) {
  53                 pgd_quicklist = (unsigned long *)(*ret);
  54                 ret[0] = 0;
  55                 pgtable_cache_size--;
  56         } else
  57                 ret = (unsigned long *)get_pgd_slow();
  58
  59         if (ret) {
  60                 memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
  61         }
  62         return (pgd_t *)ret;
  63 }
  64
  65 static inline void free_pgd_fast(pgd_t *pgd)
  66 {
  67         *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
  68         pgd_quicklist = (unsigned long *) pgd;
  69         pgtable_cache_size++;
  70 }
  71
  72 static inline void free_pgd_slow(pgd_t *pgd)
  73 {
  74         kfree((void *)pgd);
  75 }
  76
  77 extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
  78 extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long address_preadjusted);
  79
  80 static inline pte_t *get_pte_fast(void)
  81 {
  82         unsigned long *ret;
  83
  84         if((ret = (unsigned long *)pte_quicklist) != NULL) {
  85                 pte_quicklist = (unsigned long *)(*ret);
  86                 ret[0] = ret[1];
  87                 pgtable_cache_size--;
  88         }
  89         return (pte_t *)ret;
  90 }
  91
  92 static inline void free_pte_fast(pte_t *pte)
  93 {
  94         *(unsigned long *)pte = (unsigned long) pte_quicklist;
  95         pte_quicklist = (unsigned long *) pte;
  96         pgtable_cache_size++;
  97 }
  98
  99 static inline void pte_free_kernel(pte_t *pte)
 100 {
 101         free_page((unsigned long)pte);
 102 }
 103
 104 static inline void pte_free(struct page *pte)
 105 {
 106         __free_page(pte);
 107 }
 108
 109 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 110                                            unsigned long address)
 111 {
 112         pte_t *pte;
 113
 114         pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT|__GFP_ZERO);
 115
 116         return pte;
 117 }
 118
 119 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
 120 {
 121         struct page *pte;
 122
 123         pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
 124
 125         return pte;
 126 }
 127
 128 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
 129
 130 /*
 131  * allocating and freeing a pmd is trivial: the 1-entry pmd is
 132  * inside the pgd, so has no extra memory associated with it.
 133  */
 134
 135 #if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
 136
 137 #define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
 138 #define pmd_free(x)                     do { } while (0)
 139 #define pgd_populate(mm, pmd, pte)      BUG()
 140 #define __pte_free_tlb(tlb,pte)         tlb_remove_page((tlb),(pte))
 141 #define __pmd_free_tlb(tlb,pmd)         do { } while (0)
 142
 143 #elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
 144
 145 static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 146 {
 147         pmd_t *pmd;
 148         pmd = (pmd_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
 149         return pmd;
 150 }
 151
 152 static __inline__ void pmd_free(pmd_t *pmd)
 153 {
 154         free_page((unsigned long) pmd);
 155 }
 156
 157 #define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd)
 158 #define __pmd_free_tlb(tlb,pmd)         pmd_free(pmd)
 159
 160 #else
 161 #error "No defined page table size"
 162 #endif
 163
 164 #define check_pgt_cache()               do { } while (0)
 165 #define pgd_free(pgd)           free_pgd_slow(pgd)
 166 #define pgd_alloc(mm)           get_pgd_fast()
 167
 168 extern int do_check_pgt_cache(int, int);
 169
 170 #define pmd_populate_kernel(mm, pmd, pte) \
 171         set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) (pte)))
 172
 173 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 174                                 struct page *pte)
 175 {
 176         set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) page_address (pte)));
 177 }
 178
 179 #endif /* __ASM_SH64_PGALLOC_H */