include/asm-i386/mmu_context.h

   1 #ifndef __I386_MMU_CONTEXT_H
   2 #define __I386_MMU_CONTEXT_H
   3
   4 #include <asm/desc.h>
   5 #include <asm/atomic.h>
   6
   7 /*
   8  * possibly do the LDT unload here?
   9  */
  10 #define destroy_context(mm)             do { } while(0)
  11 #define init_new_context(tsk,mm)        do { } while (0)
  12
  13 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk, unsigned cpu)
  14 {
  15
  16         if (prev != next) {
  17                 /*
  18                  * Re-load LDT if necessary
  19                  */
  20                 if (prev->segments != next->segments)
  21                         load_LDT(next);
  22
  23                 /* Re-load page tables */
  24                 asm volatile("movl %0,%%cr3": :"r" (__pa(next->pgd)));
  25                 clear_bit(cpu, &prev->cpu_vm_mask);
  26         }
  27         set_bit(cpu, &next->cpu_vm_mask);
  28 }
  29
  30 #define activate_mm(prev, next) \
  31         switch_mm((prev),(next),NULL,smp_processor_id())
  32
  33 #endif