arch/x86/include/asm/mmu_context_32.h

   1 #ifndef _ASM_X86_MMU_CONTEXT_32_H
   2 #define _ASM_X86_MMU_CONTEXT_32_H
   3
   4 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
   5 {
   6 #ifdef CONFIG_SMP
   7         if (x86_read_percpu(cpu_tlbstate.state) == TLBSTATE_OK)
   8                 x86_write_percpu(cpu_tlbstate.state, TLBSTATE_LAZY);
   9 #endif
  10 }
  11
  12 static inline void switch_mm(struct mm_struct *prev,
  13                              struct mm_struct *next,
  14                              struct task_struct *tsk)
  15 {
  16         int cpu = smp_processor_id();
  17
  18         if (likely(prev != next)) {
  19                 /* stop flush ipis for the previous mm */
  20                 cpu_clear(cpu, prev->cpu_vm_mask);
  21 #ifdef CONFIG_SMP
  22                 x86_write_percpu(cpu_tlbstate.state, TLBSTATE_OK);
  23                 x86_write_percpu(cpu_tlbstate.active_mm, next);
  24 #endif
  25                 cpu_set(cpu, next->cpu_vm_mask);
  26
  27                 /* Re-load page tables */
  28                 load_cr3(next->pgd);
  29
  30                 /*
  31                  * load the LDT, if the LDT is different:
  32                  */
  33                 if (unlikely(prev->context.ldt != next->context.ldt))
  34                         load_LDT_nolock(&next->context);
  35         }
  36 #ifdef CONFIG_SMP
  37         else {
  38                 x86_write_percpu(cpu_tlbstate.state, TLBSTATE_OK);
  39                 BUG_ON(x86_read_percpu(cpu_tlbstate.active_mm) != next);
  40
  41                 if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
  42                         /* We were in lazy tlb mode and leave_mm disabled
  43                          * tlb flush IPI delivery. We must reload %cr3.
  44                          */
  45                         load_cr3(next->pgd);
  46                         load_LDT_nolock(&next->context);
  47                 }
  48         }
  49 #endif
  50 }
  51
  52 #define deactivate_mm(tsk, mm)                  \
  53         asm("movl %0,%%gs": :"r" (0));
  54
  55 #endif /* _ASM_X86_MMU_CONTEXT_32_H */