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 <asm/processor.h>
  18 #include <linux/threads.h>
  19 #include <linux/gfp.h>
  20 #include <linux/mm.h>
  21
  22 #define check_pgt_cache()       do {} while (0)
  23
  24 extern void diag10(unsigned long addr);
  25
  26 /*
  27  * Allocate and free page tables. The xxx_kernel() versions are
  28  * used to allocate a kernel page table - this turns on ASN bits
  29  * if any.
  30  */
  31
  32 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  33 {
  34         pgd_t *pgd;
  35         int i;
  36
  37 #ifndef __s390x__
  38         pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1);
  39         if (pgd != NULL)
  40                 for (i = 0; i < USER_PTRS_PER_PGD; i++)
  41                         pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
  42 #else /* __s390x__ */
  43         pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,2);
  44         if (pgd != NULL)
  45                 for (i = 0; i < PTRS_PER_PGD; i++)
  46                         pgd_clear(pgd + i);
  47 #endif /* __s390x__ */
  48         return pgd;
  49 }
  50
  51 static inline void pgd_free(pgd_t *pgd)
  52 {
  53 #ifndef __s390x__
  54         free_pages((unsigned long) pgd, 1);
  55 #else /* __s390x__ */
  56         free_pages((unsigned long) pgd, 2);
  57 #endif /* __s390x__ */
  58 }
  59
  60 #ifndef __s390x__
  61 /*
  62  * page middle directory allocation/free routines.
  63  * We use pmd cache only on s390x, so these are dummy routines. This
  64  * code never triggers because the pgd will always be present.
  65  */
  66 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  67 #define pmd_free(x)                     do { } while (0)
  68 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  69 #define pgd_populate(mm, pmd, pte)      BUG()
  70 #else /* __s390x__ */
  71 static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
  72 {
  73         pmd_t *pmd;
  74         int i;
  75
  76         pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 2);
  77         if (pmd != NULL) {
  78                 for (i=0; i < PTRS_PER_PMD; i++)
  79                         pmd_clear(pmd+i);
  80         }
  81         return pmd;
  82 }
  83
  84 static inline void pmd_free (pmd_t *pmd)
  85 {
  86         free_pages((unsigned long) pmd, 2);
  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-mem_map) << PAGE_SHIFT));
 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;
 129         int i;
 130
 131         pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
 132         if (pte != NULL) {
 133                 for (i=0; i < PTRS_PER_PTE; i++)
 134                         pte_clear(pte+i);
 135         }
 136         return pte;
 137 }
 138
 139 static inline struct page *
 140 pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
 141 {
 142         pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
 143         if (pte)
 144                 return virt_to_page(pte);
 145         return 0;
 146 }
 147
 148 static inline void pte_free_kernel(pte_t *pte)
 149 {
 150         free_page((unsigned long) pte);
 151 }
 152
 153 static inline void pte_free(struct page *pte)
 154 {
 155         __free_page(pte);
 156 }
 157
 158 #define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte)
 159
 160 /*
 161  * This establishes kernel virtual mappings (e.g., as a result of a
 162  * vmalloc call).  Since s390-esame uses a separate kernel page table,
 163  * there is nothing to do here... :)
 164  */
 165 #define set_pgdir(addr,entry) do { } while(0)
 166
 167 #endif /* _S390_PGALLOC_H */