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Linux/arch/s390/include/asm/pgalloc.h

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  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 *, unsigned long);
 22 void page_table_free(struct mm_struct *, unsigned long *);
 23 void page_table_free_rcu(struct mmu_gather *, 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         if (table)
 95                 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
 96         return (pmd_t *) table;
 97 }
 98 #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
 99 
100 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
101 {
102         pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
103 }
104 
105 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
106 {
107         pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
108 }
109 
110 #endif /* CONFIG_64BIT */
111 
112 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
113 {
114         spin_lock_init(&mm->context.list_lock);
115         INIT_LIST_HEAD(&mm->context.pgtable_list);
116         INIT_LIST_HEAD(&mm->context.gmap_list);
117         return (pgd_t *) crst_table_alloc(mm);
118 }
119 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
120 
121 static inline void pmd_populate(struct mm_struct *mm,
122                                 pmd_t *pmd, pgtable_t pte)
123 {
124         pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
125 }
126 
127 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
128 
129 #define pmd_pgtable(pmd) \
130         (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
131 
132 /*
133  * page table entry allocation/free routines.
134  */
135 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
136 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
137 
138 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
139 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
140 
141 extern void rcu_table_freelist_finish(void);
142 
143 #endif /* _S390_PGALLOC_H */
144 

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