arch/s390/include/asm/pgalloc.h

   1 /*
   2  *  S390 version
   3  *    Copyright IBM Corp. 1999, 2000
   4  *    Author(s): Hartmut Penner (hp@de.ibm.com)
   5  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   6  *
   7  *  Derived from "include/asm-i386/pgalloc.h"
   8  *    Copyright (C) 1994  Linus Torvalds
   9  */
  10
  11 #ifndef _S390_PGALLOC_H
  12 #define _S390_PGALLOC_H
  13
  14 #include <linux/threads.h>
  15 #include <linux/gfp.h>
  16 #include <linux/mm.h>
  17
  18 unsigned long *crst_table_alloc(struct mm_struct *);
  19 void crst_table_free(struct mm_struct *, unsigned long *);
  20
  21 unsigned long *page_table_alloc(struct mm_struct *);
  22 void page_table_free(struct mm_struct *, unsigned long *);
  23 void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
  24
  25 int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
  26                           unsigned long key, bool nq);
  27
  28 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
  29 {
  30         typedef struct { char _[n]; } addrtype;
  31
  32         *s = val;
  33         n = (n / 256) - 1;
  34         asm volatile(
  35 #ifdef CONFIG_64BIT
  36                 "       mvc     8(248,%0),0(%0)\n"
  37 #else
  38                 "       mvc     4(252,%0),0(%0)\n"
  39 #endif
  40                 "0:     mvc     256(256,%0),0(%0)\n"
  41                 "       la      %0,256(%0)\n"
  42                 "       brct    %1,0b\n"
  43                 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
  44                 : "m" (*(addrtype *) s));
  45 }
  46
  47 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
  48 {
  49         clear_table(crst, entry, sizeof(unsigned long)*2048);
  50 }
  51
  52 #ifndef CONFIG_64BIT
  53
  54 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
  55 {
  56         return _SEGMENT_ENTRY_EMPTY;
  57 }
  58
  59 #define pud_alloc_one(mm,address)               ({ BUG(); ((pud_t *)2); })
  60 #define pud_free(mm, x)                         do { } while (0)
  61
  62 #define pmd_alloc_one(mm,address)               ({ BUG(); ((pmd_t *)2); })
  63 #define pmd_free(mm, x)                         do { } while (0)
  64
  65 #define pgd_populate(mm, pgd, pud)              BUG()
  66 #define pud_populate(mm, pud, pmd)              BUG()
  67
  68 #else /* CONFIG_64BIT */
  69
  70 static inline unsigned long pgd_entry_type(struct mm_struct *mm)
  71 {
  72         if (mm->context.asce_limit <= (1UL << 31))
  73                 return _SEGMENT_ENTRY_EMPTY;
  74         if (mm->context.asce_limit <= (1UL << 42))
  75                 return _REGION3_ENTRY_EMPTY;
  76         return _REGION2_ENTRY_EMPTY;
  77 }
  78
  79 int crst_table_upgrade(struct mm_struct *, unsigned long limit);
  80 void crst_table_downgrade(struct mm_struct *, unsigned long limit);
  81
  82 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
  83 {
  84         unsigned long *table = crst_table_alloc(mm);
  85         if (table)
  86                 crst_table_init(table, _REGION3_ENTRY_EMPTY);
  87         return (pud_t *) table;
  88 }
  89 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
  90
  91 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
  92 {
  93         unsigned long *table = crst_table_alloc(mm);
  94
  95         if (!table)
  96                 return NULL;
  97         crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
  98         if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
  99                 crst_table_free(mm, table);
 100                 return NULL;
 101         }
 102         return (pmd_t *) table;
 103 }
 104
 105 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 106 {
 107         pgtable_pmd_page_dtor(virt_to_page(pmd));
 108         crst_table_free(mm, (unsigned long *) pmd);
 109 }
 110
 111 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
 112 {
 113         pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
 114 }
 115
 116 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 117 {
 118         pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
 119 }
 120
 121 #endif /* CONFIG_64BIT */
 122
 123 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 124 {
 125         spin_lock_init(&mm->context.list_lock);
 126         INIT_LIST_HEAD(&mm->context.pgtable_list);
 127         INIT_LIST_HEAD(&mm->context.gmap_list);
 128         return (pgd_t *) crst_table_alloc(mm);
 129 }
 130 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
 131
 132 static inline void pmd_populate(struct mm_struct *mm,
 133                                 pmd_t *pmd, pgtable_t pte)
 134 {
 135         pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
 136 }
 137
 138 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
 139
 140 #define pmd_pgtable(pmd) \
 141         (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
 142
 143 /*
 144  * page table entry allocation/free routines.
 145  */
 146 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
 147 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
 148
 149 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
 150 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
 151
 152 extern void rcu_table_freelist_finish(void);
 153
 154 #endif /* _S390_PGALLOC_H */