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)             flush_tlb_mm(mm)
  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         unsigned long pgd;
  28
  29         if (prev != next) {
  30 #ifndef __s390x__
  31                 pgd = (__pa(next->pgd)&PAGE_MASK) |
  32                       (_SEGMENT_TABLE|USER_STD_MASK);
  33                 /* Load page tables */
  34                 asm volatile("    lctl  7,7,%0\n"   /* secondary space */
  35                              "    lctl  13,13,%0\n" /* home space */
  36                              : : "m" (pgd) );
  37 #else /* __s390x__ */
  38                 pgd = (__pa(next->pgd)&PAGE_MASK) | (_REGION_TABLE|USER_STD_MASK);
  39                 /* Load page tables */
  40                 asm volatile("    lctlg 7,7,%0\n"   /* secondary space */
  41                              "    lctlg 13,13,%0\n" /* home space */
  42                              : : "m" (pgd) );
  43 #endif /* __s390x__ */
  44         }
  45         set_bit(smp_processor_id(), &next->cpu_vm_mask);
  46 }
  47
  48 #define deactivate_mm(tsk,mm)   do { } while (0)
  49
  50 extern inline void activate_mm(struct mm_struct *prev,
  51                                struct mm_struct *next)
  52 {
  53         switch_mm(prev, next, current);
  54 }
  55
  56 #endif