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)        do { } while (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, unsigned cpu)
  21 {
  22 }
  23
  24 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  25                              struct task_struct *tsk, unsigned cpu)
  26 {
  27         unsigned long pgd;
  28
  29         if (prev != next) {
  30                 pgd = (__pa(next->pgd) & PAGE_MASK) | _SEGMENT_TABLE;
  31                 /* Load page tables */
  32                 asm volatile("    lctl  7,7,%0\n"   /* secondary space */
  33                              "    lctl  13,13,%0\n" /* home space */
  34                              : : "m" (pgd) );
  35         }
  36         set_bit(cpu, &next->cpu_vm_mask);
  37 }
  38
  39 extern inline void activate_mm(struct mm_struct *prev,
  40                                struct mm_struct *next)
  41 {
  42         switch_mm(prev, next, current, smp_processor_id());
  43 }
  44
  45 #endif