kernel/2.6.29.6-aldebaran-rt/arch/powerpc/include/asm/pgalloc-64.h

   1 #ifndef _ASM_POWERPC_PGALLOC_64_H
   2 #define _ASM_POWERPC_PGALLOC_64_H
   3 /*
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/cpumask.h>
  12 #include <linux/percpu.h>
  13
  14 #ifndef CONFIG_PPC_SUBPAGE_PROT
  15 static inline void subpage_prot_free(pgd_t *pgd) {}
  16 #endif
  17
  18 extern struct kmem_cache *pgtable_cache[];
  19
  20 #define PGD_CACHE_NUM           0
  21 #define PUD_CACHE_NUM           1
  22 #define PMD_CACHE_NUM           1
  23 #define HUGEPTE_CACHE_NUM       2
  24 #define PTE_NONCACHE_NUM        7  /* from GFP rather than kmem_cache */
  25
  26 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  27 {
  28         return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
  29 }
  30
  31 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  32 {
  33         subpage_prot_free(pgd);
  34         kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
  35 }
  36
  37 #ifndef CONFIG_PPC_64K_PAGES
  38
  39 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  40
  41 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  42 {
  43         return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
  44                                 GFP_KERNEL|__GFP_REPEAT);
  45 }
  46
  47 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
  48 {
  49         kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
  50 }
  51
  52 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  53 {
  54         pud_set(pud, (unsigned long)pmd);
  55 }
  56
  57 #define pmd_populate(mm, pmd, pte_page) \
  58         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  59 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  60 #define pmd_pgtable(pmd) pmd_page(pmd)
  61
  62
  63 #else /* CONFIG_PPC_64K_PAGES */
  64
  65 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  66
  67 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  68                                        pte_t *pte)
  69 {
  70         pmd_set(pmd, (unsigned long)pte);
  71 }
  72
  73 #define pmd_populate(mm, pmd, pte_page) \
  74         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  75 #define pmd_pgtable(pmd) pmd_page(pmd)
  76
  77 #endif /* CONFIG_PPC_64K_PAGES */
  78
  79 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  80 {
  81         return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
  82                                 GFP_KERNEL|__GFP_REPEAT);
  83 }
  84
  85 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  86 {
  87         kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
  88 }
  89
  90 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  91                                           unsigned long address)
  92 {
  93         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
  94 }
  95
  96 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  97                                         unsigned long address)
  98 {
  99         struct page *page;
 100         pte_t *pte;
 101
 102         pte = pte_alloc_one_kernel(mm, address);
 103         if (!pte)
 104                 return NULL;
 105         page = virt_to_page(pte);
 106         pgtable_page_ctor(page);
 107         return page;
 108 }
 109
 110 static inline void pgtable_free(pgtable_free_t pgf)
 111 {
 112         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
 113         int cachenum = pgf.val & PGF_CACHENUM_MASK;
 114
 115         if (cachenum == PTE_NONCACHE_NUM)
 116                 free_page((unsigned long)p);
 117         else
 118                 kmem_cache_free(pgtable_cache[cachenum], p);
 119 }
 120
 121 #define __pmd_free_tlb(tlb, pmd)        \
 122         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 123                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
 124 #ifndef CONFIG_PPC_64K_PAGES
 125 #define __pud_free_tlb(tlb, pud)        \
 126         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
 127                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
 128 #endif /* CONFIG_PPC_64K_PAGES */
 129
 130 #define check_pgt_cache()       do { } while (0)
 131
 132 #endif /* _ASM_POWERPC_PGALLOC_64_H */