1 /* 2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL 4 */ 5 6 #ifndef __UM_MMU_CONTEXT_H 7 #define __UM_MMU_CONTEXT_H 8 9 #include "linux/sched.h" 10 #include "um_mmu.h" 11 12 extern void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm); 13 extern void arch_exit_mmap(struct mm_struct *mm); 14 15 #define get_mmu_context(task) do ; while(0) 16 #define activate_context(tsk) do ; while(0) 17 18 #define deactivate_mm(tsk,mm) do { } while (0) 19 20 extern void force_flush_all(void); 21 22 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) 23 { 24 /* 25 * This is called by fs/exec.c and sys_unshare() 26 * when the new ->mm is used for the first time. 27 */ 28 __switch_mm(&new->context.id); 29 arch_dup_mmap(old, new); 30 } 31 32 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 33 struct task_struct *tsk) 34 { 35 unsigned cpu = smp_processor_id(); 36 37 if(prev != next){ 38 cpu_clear(cpu, prev->cpu_vm_mask); 39 cpu_set(cpu, next->cpu_vm_mask); 40 if(next != &init_mm) 41 __switch_mm(&next->context.id); 42 } 43 } 44 45 static inline void enter_lazy_tlb(struct mm_struct *mm, 46 struct task_struct *tsk) 47 { 48 } 49 50 extern int init_new_context(struct task_struct *task, struct mm_struct *mm); 51 52 extern void destroy_context(struct mm_struct *mm); 53 54 #endif 55