arch/x86/include/asm/mmu_context_64.h

   1 #ifndef _ASM_X86_MMU_CONTEXT_64_H
   2 #define _ASM_X86_MMU_CONTEXT_64_H
   3
   4 #include <asm/pda.h>
   5
   6 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
   7 {
   8 #ifdef CONFIG_SMP
   9         if (read_pda(mmu_state) == TLBSTATE_OK)
  10                 write_pda(mmu_state, TLBSTATE_LAZY);
  11 #endif
  12 }
  13
  14 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  15                              struct task_struct *tsk)
  16 {
  17         unsigned cpu = smp_processor_id();
  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                 write_pda(mmu_state, TLBSTATE_OK);
  23                 write_pda(active_mm, next);
  24 #endif
  25                 cpu_set(cpu, next->cpu_vm_mask);
  26                 load_cr3(next->pgd);
  27
  28                 if (unlikely(next->context.ldt != prev->context.ldt))
  29                         load_LDT_nolock(&next->context);
  30         }
  31 #ifdef CONFIG_SMP
  32         else {
  33                 write_pda(mmu_state, TLBSTATE_OK);
  34                 if (read_pda(active_mm) != next)
  35                         BUG();
  36                 if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
  37                         /* We were in lazy tlb mode and leave_mm disabled
  38                          * tlb flush IPI delivery. We must reload CR3
  39                          * to make sure to use no freed page tables.
  40                          */
  41                         load_cr3(next->pgd);
  42                         load_LDT_nolock(&next->context);
  43                 }
  44         }
  45 #endif
  46 }
  47
  48 #define deactivate_mm(tsk, mm)                  \
  49 do {                                            \
  50         load_gs_index(0);                       \
  51         asm volatile("movl %0,%%fs"::"r"(0));   \
  52 } while (0)
  53
  54 #endif /* _ASM_X86_MMU_CONTEXT_64_H */