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