git.oblomov.eu Git - linux-2.6/blob - include/asm-x86/mmu_context_32.h

   1 #ifndef __I386_SCHED_H
   2 #define __I386_SCHED_H
   3
   4 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
   5 {
   6 #ifdef CONFIG_SMP
   7         unsigned cpu = smp_processor_id();
   8         if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK)
   9                 per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_LAZY;
  10 #endif
  11 }
  12
  13 static inline void switch_mm(struct mm_struct *prev,
  14                              struct mm_struct *next,
  15                              struct task_struct *tsk)
  16 {
  17         int cpu = smp_processor_id();
  18
  19         if (likely(prev != next)) {
  20                 /* stop flush ipis for the previous mm */
  21                 cpu_clear(cpu, prev->cpu_vm_mask);
  22 #ifdef CONFIG_SMP
  23                 per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK;
  24                 per_cpu(cpu_tlbstate, cpu).active_mm = next;
  25 #endif
  26                 cpu_set(cpu, next->cpu_vm_mask);
  27
  28                 /* Re-load page tables */
  29                 load_cr3(next->pgd);
  30
  31                 /*
  32                  * load the LDT, if the LDT is different:
  33                  */
  34                 if (unlikely(prev->context.ldt != next->context.ldt))
  35                         load_LDT_nolock(&next->context);
  36         }
  37 #ifdef CONFIG_SMP
  38         else {
  39                 per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK;
  40                 BUG_ON(per_cpu(cpu_tlbstate, cpu).active_mm != next);
  41
  42                 if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
  43                         /* We were in lazy tlb mode and leave_mm disabled
  44                          * tlb flush IPI delivery. We must reload %cr3.
  45                          */
  46                         load_cr3(next->pgd);
  47                         load_LDT_nolock(&next->context);
  48                 }
  49         }
  50 #endif
  51 }
  52
  53 #define deactivate_mm(tsk, mm)                  \
  54         asm("movl %0,%%gs": :"r" (0));
  55
  56 #endif