include/asm-s390/pgalloc.h

   1 /*
   2  *  include/asm-s390/pgalloc.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com)
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  *  Derived from "include/asm-i386/pgalloc.h"
  10  *    Copyright (C) 1994  Linus Torvalds
  11  */
  12
  13 #ifndef _S390_PGALLOC_H
  14 #define _S390_PGALLOC_H
  15
  16 #include <linux/threads.h>
  17 #include <linux/gfp.h>
  18 #include <linux/mm.h>
  19
  20 #define check_pgt_cache()       do {} while (0)
  21
  22 extern void diag10(unsigned long addr);
  23
  24 /*
  25  * Page allocation orders.
  26  */
  27 #ifndef __s390x__
  28 # define PGD_ALLOC_ORDER        1
  29 #else /* __s390x__ */
  30 # define PMD_ALLOC_ORDER        2
  31 # define PGD_ALLOC_ORDER        2
  32 #endif /* __s390x__ */
  33
  34 /*
  35  * Allocate and free page tables. The xxx_kernel() versions are
  36  * used to allocate a kernel page table - this turns on ASN bits
  37  * if any.
  38  */
  39
  40 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  41 {
  42         pgd_t *pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
  43         int i;
  44
  45         if (!pgd)
  46                 return NULL;
  47         for (i = 0; i < PTRS_PER_PGD; i++)
  48 #ifndef __s390x__
  49                 pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
  50 #else
  51                 pgd_clear(pgd + i);
  52 #endif
  53         return pgd;
  54 }
  55
  56 static inline void pgd_free(pgd_t *pgd)
  57 {
  58         free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
  59 }
  60
  61 #ifndef __s390x__
  62 /*
  63  * page middle directory allocation/free routines.
  64  * We use pmd cache only on s390x, so these are dummy routines. This
  65  * code never triggers because the pgd will always be present.
  66  */
  67 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  68 #define pmd_free(x)                     do { } while (0)
  69 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  70 #define pgd_populate(mm, pmd, pte)      BUG()
  71 #else /* __s390x__ */
  72 static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
  73 {
  74         pmd_t *pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
  75         int i;
  76
  77         if (!pmd)
  78                 return NULL;
  79         for (i=0; i < PTRS_PER_PMD; i++)
  80                 pmd_clear(pmd + i);
  81         return pmd;
  82 }
  83
  84 static inline void pmd_free (pmd_t *pmd)
  85 {
  86         free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
  87 }
  88
  89 #define __pmd_free_tlb(tlb,pmd)                 \
  90         do {                                    \
  91                 tlb_flush_mmu(tlb, 0, 0);       \
  92                 pmd_free(pmd);                  \
  93          } while (0)
  94
  95 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
  96 {
  97         pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
  98 }
  99
 100 #endif /* __s390x__ */
 101
 102 static inline void
 103 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
 104 {
 105 #ifndef __s390x__
 106         pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
 107         pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
 108         pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
 109         pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
 110 #else /* __s390x__ */
 111         pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
 112         pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
 113 #endif /* __s390x__ */
 114 }
 115
 116 static inline void
 117 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
 118 {
 119         pmd_populate_kernel(mm, pmd, (pte_t *)page_to_phys(page));
 120 }
 121
 122 /*
 123  * page table entry allocation/free routines.
 124  */
 125 static inline pte_t *
 126 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
 127 {
 128         pte_t *pte = (pte_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
 129         int i;
 130
 131         if (!pte)
 132                 return NULL;
 133         for (i=0; i < PTRS_PER_PTE; i++) {
 134                 pte_clear(mm, vmaddr, pte + i);
 135                 vmaddr += PAGE_SIZE;
 136         }
 137         return pte;
 138 }
 139
 140 static inline struct page *
 141 pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
 142 {
 143         pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
 144         if (pte)
 145                 return virt_to_page(pte);
 146         return NULL;
 147 }
 148
 149 static inline void pte_free_kernel(pte_t *pte)
 150 {
 151         free_page((unsigned long) pte);
 152 }
 153
 154 static inline void pte_free(struct page *pte)
 155 {
 156         __free_page(pte);
 157 }
 158
 159 #define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte)
 160
 161 #endif /* _S390_PGALLOC_H */