arch/s390/include/asm/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 unsigned long *crst_table_alloc(struct mm_struct *);
  21 void crst_table_free(struct mm_struct *, unsigned long *);
  22
  23 unsigned long *page_table_alloc(struct mm_struct *);
  24 void page_table_free(struct mm_struct *, unsigned long *);
  25 #ifdef CONFIG_HAVE_RCU_TABLE_FREE
  26 void page_table_free_rcu(struct mmu_gather *, unsigned long *);
  27 void __tlb_remove_table(void *_table);
  28 #endif
  29
  30 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
  31 {
  32         typedef struct { char _[n]; } addrtype;
  33
  34         *s = val;
  35         n = (n / 256) - 1;
  36         asm volatile(
  37 #ifdef CONFIG_64BIT
  38                 "       mvc     8(248,%0),0(%0)\n"
  39 #else
  40                 "       mvc     4(252,%0),0(%0)\n"
  41 #endif
  42                 "0:     mvc     256(256,%0),0(%0)\n"
  43                 "       la      %0,256(%0)\n"
  44                 "       brct    %1,0b\n"
  45                 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
  46                 : "m" (*(addrtype *) s));
  47 }
  48
  49 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
  50 {
  51         clear_table(crst, entry, sizeof(unsigned long)*2048);
  52 }
  53
  54 #ifndef __s390x__
  55
  56 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
  57 {
  58         return _SEGMENT_ENTRY_EMPTY;
  59 }
  60
  61 #define pud_alloc_one(mm,address)               ({ BUG(); ((pud_t *)2); })
  62 #define pud_free(mm, x)                         do { } while (0)
  63
  64 #define pmd_alloc_one(mm,address)               ({ BUG(); ((pmd_t *)2); })
  65 #define pmd_free(mm, x)                         do { } while (0)
  66
  67 #define pgd_populate(mm, pgd, pud)              BUG()
  68 #define pud_populate(mm, pud, pmd)              BUG()
  69
  70 #else /* __s390x__ */
  71
  72 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
  73 {
  74         if (mm->context.asce_limit <= (1UL << 31))
  75                 return _SEGMENT_ENTRY_EMPTY;
  76         if (mm->context.asce_limit <= (1UL << 42))
  77                 return _REGION3_ENTRY_EMPTY;
  78         return _REGION2_ENTRY_EMPTY;
  79 }
  80
  81 int crst_table_upgrade(struct mm_struct *, unsigned long limit);
  82 void crst_table_downgrade(struct mm_struct *, unsigned long limit);
  83
  84 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
  85 {
  86         unsigned long *table = crst_table_alloc(mm);
  87         if (table)
  88                 crst_table_init(table, _REGION3_ENTRY_EMPTY);
  89         return (pud_t *) table;
  90 }
  91 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
  92
  93 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
  94 {
  95         unsigned long *table = crst_table_alloc(mm);
  96         if (table)
  97                 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
  98         return (pmd_t *) table;
  99 }
 100 #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
 101
 102 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
 103 {
 104         pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
 105 }
 106
 107 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 108 {
 109         pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
 110 }
 111
 112 #endif /* __s390x__ */
 113
 114 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 115 {
 116         spin_lock_init(&mm->context.list_lock);
 117         INIT_LIST_HEAD(&mm->context.pgtable_list);
 118         return (pgd_t *) crst_table_alloc(mm);
 119 }
 120 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
 121
 122 static inline void pmd_populate(struct mm_struct *mm,
 123                                 pmd_t *pmd, pgtable_t pte)
 124 {
 125         pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
 126 }
 127
 128 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
 129
 130 #define pmd_pgtable(pmd) \
 131         (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
 132
 133 /*
 134  * page table entry allocation/free routines.
 135  */
 136 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
 137 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
 138
 139 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
 140 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
 141
 142 extern void rcu_table_freelist_finish(void);
 143
 144 #endif /* _S390_PGALLOC_H */