diff options
Diffstat (limited to 'arch/x86/include/asm/mmu_context_64.h')
| -rw-r--r-- | arch/x86/include/asm/mmu_context_64.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mmu_context_64.h b/arch/x86/include/asm/mmu_context_64.h new file mode 100644 index 0000000..2675867 --- /dev/null +++ b/arch/x86/include/asm/mmu_context_64.h @@ -0,0 +1,54 @@ +#ifndef ASM_X86__MMU_CONTEXT_64_H +#define ASM_X86__MMU_CONTEXT_64_H + +#include <asm/pda.h> + +static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) +{ +#ifdef CONFIG_SMP + if (read_pda(mmu_state) == TLBSTATE_OK) + write_pda(mmu_state, TLBSTATE_LAZY); +#endif +} + +static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, + struct task_struct *tsk) +{ + unsigned cpu = smp_processor_id(); + if (likely(prev != next)) { + /* stop flush ipis for the previous mm */ + cpu_clear(cpu, prev->cpu_vm_mask); +#ifdef CONFIG_SMP + write_pda(mmu_state, TLBSTATE_OK); + write_pda(active_mm, next); +#endif + cpu_set(cpu, next->cpu_vm_mask); + load_cr3(next->pgd); + + if (unlikely(next->context.ldt != prev->context.ldt)) + load_LDT_nolock(&next->context); + } +#ifdef CONFIG_SMP + else { + write_pda(mmu_state, TLBSTATE_OK); + if (read_pda(active_mm) != next) + BUG(); + if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) { + /* We were in lazy tlb mode and leave_mm disabled + * tlb flush IPI delivery. We must reload CR3 + * to make sure to use no freed page tables. + */ + load_cr3(next->pgd); + load_LDT_nolock(&next->context); + } + } +#endif +} + +#define deactivate_mm(tsk, mm) \ +do { \ + load_gs_index(0); \ + asm volatile("movl %0,%%fs"::"r"(0)); \ +} while (0) + +#endif /* ASM_X86__MMU_CONTEXT_64_H */ |