include/asm-s390/mmu_context.h

   1 /*
   2  *  include/asm-s390/mmu_context.h
   3  *
   4  *  S390 version
   5  *
   6  *  Derived from "include/asm-i386/mmu_context.h"
   7  */
   8
   9 #ifndef __S390_MMU_CONTEXT_H
  10 #define __S390_MMU_CONTEXT_H
  11
  12 /*
  13  * get a new mmu context.. S390 don't know about contexts.
  14  */
  15 #define init_new_context(tsk,mm)        0
  16
  17 #define destroy_context(mm)             do { } while (0)
  18
  19 static inline void enter_lazy_tlb(struct mm_struct *mm,
  20                                   struct task_struct *tsk)
  21 {
  22 }
  23
  24 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  25                              struct task_struct *tsk)
  26 {
  27         if (prev != next) {
  28 #ifndef __s390x__
  29                 S390_lowcore.user_asce = (__pa(next->pgd)&PAGE_MASK) |
  30                       (_SEGMENT_TABLE|USER_STD_MASK);
  31                 /* Load home space page table origin. */
  32                 asm volatile("lctl  13,13,%0"
  33                              : : "m" (S390_lowcore.user_asce) );
  34 #else /* __s390x__ */
  35                 S390_lowcore.user_asce = (__pa(next->pgd) & PAGE_MASK) |
  36                         (_REGION_TABLE|USER_STD_MASK);
  37                 /* Load home space page table origin. */
  38                 asm volatile("lctlg  13,13,%0"
  39                              : : "m" (S390_lowcore.user_asce) );
  40 #endif /* __s390x__ */
  41         }
  42         cpu_set(smp_processor_id(), next->cpu_vm_mask);
  43 }
  44
  45 #define deactivate_mm(tsk,mm)   do { } while (0)
  46
  47 extern inline void activate_mm(struct mm_struct *prev,
  48                                struct mm_struct *next)
  49 {
  50         switch_mm(prev, next, current);
  51         set_fs(current->thread.mm_segment);
  52 }
  53
  54 #endif