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/config.h>
  17 #include <linux/threads.h>
  18 #include <linux/gfp.h>
  19 #include <linux/mm.h>
  20
  21 #define check_pgt_cache()       do {} while (0)
  22
  23 extern void diag10(unsigned long addr);
  24
  25 /*
  26  * Allocate and free page tables. The xxx_kernel() versions are
  27  * used to allocate a kernel page table - this turns on ASN bits
  28  * if any.
  29  */
  30
  31 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  32 {
  33         pgd_t *pgd;
  34         int i;
  35
  36 #ifndef __s390x__
  37         pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1);
  38         if (pgd != NULL)
  39                 for (i = 0; i < USER_PTRS_PER_PGD; i++)
  40                         pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
  41 #else /* __s390x__ */
  42         pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2);
  43         if (pgd != NULL)
  44                 for (i = 0; i < PTRS_PER_PGD; i++)
  45                         pgd_clear(pgd + i);
  46 #endif /* __s390x__ */
  47         return pgd;
  48 }
  49
  50 static inline void pgd_free(pgd_t *pgd)
  51 {
  52 #ifndef __s390x__
  53         free_pages((unsigned long) pgd, 1);
  54 #else /* __s390x__ */
  55         free_pages((unsigned long) pgd, 2);
  56 #endif /* __s390x__ */
  57 }
  58
  59 #ifndef __s390x__
  60 /*
  61  * page middle directory allocation/free routines.
  62  * We use pmd cache only on s390x, so these are dummy routines. This
  63  * code never triggers because the pgd will always be present.
  64  */
  65 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  66 #define pmd_free(x)                     do { } while (0)
  67 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  68 #define pgd_populate(mm, pmd, pte)      BUG()
  69 #else /* __s390x__ */
  70 static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
  71 {
  72         pmd_t *pmd;
  73         int i;
  74
  75         pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2);
  76         if (pmd != NULL) {
  77                 for (i=0; i < PTRS_PER_PMD; i++)
  78                         pmd_clear(pmd+i);
  79         }
  80         return pmd;
  81 }
  82
  83 static inline void pmd_free (pmd_t *pmd)
  84 {
  85         free_pages((unsigned long) pmd, 2);
  86 }
  87
  88 #define __pmd_free_tlb(tlb,pmd)                 \
  89         do {                                    \
  90                 tlb_flush_mmu(tlb, 0, 0);       \
  91                 pmd_free(pmd);                  \
  92          } while (0)
  93
  94 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
  95 {
  96         pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
  97 }
  98
  99 #endif /* __s390x__ */
 100
 101 static inline void
 102 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
 103 {
 104 #ifndef __s390x__
 105         pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
 106         pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
 107         pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
 108         pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
 109 #else /* __s390x__ */
 110         pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
 111         pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
 112 #endif /* __s390x__ */
 113 }
 114
 115 static inline void
 116 pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
 117 {
 118         pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT));
 119 }
 120
 121 /*
 122  * page table entry allocation/free routines.
 123  */
 124 static inline pte_t *
 125 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
 126 {
 127         pte_t *pte;
 128         int i;
 129
 130         pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
 131         if (pte != NULL) {
 132                 for (i=0; i < PTRS_PER_PTE; i++) {
 133                         pte_clear(mm, vmaddr, pte+i);
 134                         vmaddr += PAGE_SIZE;
 135                 }
 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 0;
 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 /*
 162  * This establishes kernel virtual mappings (e.g., as a result of a
 163  * vmalloc call).  Since s390-esame uses a separate kernel page table,
 164  * there is nothing to do here... :)
 165  */
 166 #define set_pgdir(addr,entry) do { } while(0)
 167
 168 #endif /* _S390_PGALLOC_H */