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 <asm/mmu.h> 11 12 extern void uml_setup_stubs(struct mm_struct *mm); 13 /* 14 * Needed since we do not use the asm-generic/mm_hooks.h: 15 */ 16 static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) 17 { 18 uml_setup_stubs(mm); 19 } 20 extern void arch_exit_mmap(struct mm_struct *mm); 21 static inline void arch_unmap(struct mm_struct *mm, 22 struct vm_area_struct *vma, 23 unsigned long start, unsigned long end) 24 { 25 } 26 static inline void arch_bprm_mm_init(struct mm_struct *mm, 27 struct vm_area_struct *vma) 28 { 29 } 30 /* 31 * end asm-generic/mm_hooks.h functions 32 */ 33 34 #define deactivate_mm(tsk,mm) do { } while (0) 35 36 extern void force_flush_all(void); 37 38 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) 39 { 40 /* 41 * This is called by fs/exec.c and sys_unshare() 42 * when the new ->mm is used for the first time. 43 */ 44 __switch_mm(&new->context.id); 45 down_write(&new->mmap_sem); 46 uml_setup_stubs(new); 47 up_write(&new->mmap_sem); 48 } 49 50 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 51 struct task_struct *tsk) 52 { 53 unsigned cpu = smp_processor_id(); 54 55 if(prev != next){ 56 cpumask_clear_cpu(cpu, mm_cpumask(prev)); 57 cpumask_set_cpu(cpu, mm_cpumask(next)); 58 if(next != &init_mm) 59 __switch_mm(&next->context.id); 60 } 61 } 62 63 static inline void enter_lazy_tlb(struct mm_struct *mm, 64 struct task_struct *tsk) 65 { 66 } 67 68 extern int init_new_context(struct task_struct *task, struct mm_struct *mm); 69 70 extern void destroy_context(struct mm_struct *mm); 71 72 #endif 73