#ifndef _ASM_X86_MMU_CONTEXT_H #define _ASM_X86_MMU_CONTEXT_H #include <asm/desc.h> #include <asm/atomic.h> #include <asm/pgalloc.h> #include <asm/tlbflush.h> #include <asm/paravirt.h> #ifndef CONFIG_PARAVIRT #include <asm-generic/mm_hooks.h> static inline void paravirt_activate_mm(struct mm_struct *prev, struct mm_struct *next) { } #endif /* !CONFIG_PARAVIRT */ /* * Used for LDT copy/destruction. */ int init_new_context(struct task_struct *tsk, struct mm_struct *mm); void destroy_context(struct mm_struct *mm); static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) { #ifdef CONFIG_SMP if (percpu_read(cpu_tlbstate.state) == TLBSTATE_OK) percpu_write(cpu_tlbstate.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 percpu_write(cpu_tlbstate.state, TLBSTATE_OK); percpu_write(cpu_tlbstate.active_mm, next); #endif cpu_set(cpu, next->cpu_vm_mask); /* Re-load page tables */ load_cr3(next->pgd); /* * load the LDT, if the LDT is different: */ if (unlikely(prev->context.ldt != next->context.ldt)) load_LDT_nolock(&next->context); } #ifdef CONFIG_SMP else { percpu_write(cpu_tlbstate.state, TLBSTATE_OK); BUG_ON(percpu_read(cpu_tlbstate.active_mm) != next); 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 activate_mm(prev, next) \ do { \ paravirt_activate_mm((prev), (next)); \ switch_mm((prev), (next), NULL); \ } while (0); #ifdef CONFIG_X86_32 #define deactivate_mm(tsk, mm) \ do { \ lazy_load_gs(0); \ } while (0) #else #define deactivate_mm(tsk, mm) \ do { \ load_gs_index(0); \ loadsegment(fs, 0); \ } while (0) #endif #endif /* _ASM_X86_MMU_CONTEXT_H */