include/asm-arm26/pgalloc.h

   1 /*
   2  *  linux/include/asm-arm/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 <asm/processor.h>
  14 #include <asm/cacheflush.h>
  15 #include <asm/tlbflush.h>
  16 #include <linux/slab.h>
  17
  18 extern struct kmem_cache *pte_cache;
  19
  20 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr){
  21         return kmem_cache_alloc(pte_cache, GFP_KERNEL);
  22 }
  23
  24 static inline void pte_free_kernel(pte_t *pte){
  25         if (pte)
  26                 kmem_cache_free(pte_cache, pte);
  27 }
  28
  29 /*
  30  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  31  * of the mm address space.
  32  *
  33  * If 'mm' is the init tasks mm, then we are doing a vmalloc, and we
  34  * need to set stuff up correctly for it.
  35  */
  36 static inline void
  37 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
  38 {
  39 //FIXME - is this doing the right thing?
  40         set_pmd(pmdp, (unsigned long)ptep | 1/*FIXME _PMD_PRESENT*/);
  41 }
  42
  43 /*
  44  * FIXME - We use the old 2.5.5-rmk1 hack for this.
  45  * This is not truly correct, but should be functional.
  46  */
  47 #define pte_alloc_one(mm,addr)  ((struct page *)pte_alloc_one_kernel(mm,addr))
  48 #define pte_free(pte)           pte_free_kernel((pte_t *)pte)
  49 #define pmd_populate(mm,pmdp,ptep) pmd_populate_kernel(mm,pmdp,(pte_t *)ptep)
  50
  51 /*
  52  * Since we have only two-level page tables, these are trivial
  53  *
  54  * trick __pmd_alloc into optimising away. The actual value is irrelevant though as it
  55  * is thrown away. It just cant be zero. -IM
  56  */
  57
  58 #define pmd_alloc_one(mm,addr)          ({ BUG(); ((pmd_t *)2); })
  59 #define pmd_free(pmd)                   do { } while (0)
  60 #define pgd_populate(mm,pmd,pte)        BUG()
  61
  62 extern pgd_t *get_pgd_slow(struct mm_struct *mm);
  63 extern void free_pgd_slow(pgd_t *pgd);
  64
  65 #define pgd_alloc(mm)                   get_pgd_slow(mm)
  66 #define pgd_free(pgd)                   free_pgd_slow(pgd)
  67
  68 #define check_pgt_cache()               do { } while (0)
  69
  70 #endif