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