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 <linux/mm_types.h> 11 12 #include <asm/mmu.h> 13 14 extern void uml_setup_stubs(struct mm_struct *mm); 15 /* 16 * Needed since we do not use the asm-generic/mm_hooks.h: 17 */ 18 static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) 19 { 20 uml_setup_stubs(mm); 21 } 22 extern void arch_exit_mmap(struct mm_struct *mm); 23 static inline void arch_unmap(struct mm_struct *mm, 24 struct vm_area_struct *vma, 25 unsigned long start, unsigned long end) 26 { 27 } 28 static inline void arch_bprm_mm_init(struct mm_struct *mm, 29 struct vm_area_struct *vma) 30 { 31 } 32 33 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 34 bool write, bool execute, bool foreign) 35 { 36 /* by default, allow everything */ 37 return true; 38 } 39 40 static inline bool arch_pte_access_permitted(pte_t pte, bool write) 41 { 42 /* by default, allow everything */ 43 return true; 44 } 45 46 /* 47 * end asm-generic/mm_hooks.h functions 48 */ 49 50 #define deactivate_mm(tsk,mm) do { } while (0) 51 52 extern void force_flush_all(void); 53 54 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) 55 { 56 /* 57 * This is called by fs/exec.c and sys_unshare() 58 * when the new ->mm is used for the first time. 59 */ 60 __switch_mm(&new->context.id); 61 down_write(&new->mmap_sem); 62 uml_setup_stubs(new); 63 up_write(&new->mmap_sem); 64 } 65 66 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 67 struct task_struct *tsk) 68 { 69 unsigned cpu = smp_processor_id(); 70 71 if(prev != next){ 72 cpumask_clear_cpu(cpu, mm_cpumask(prev)); 73 cpumask_set_cpu(cpu, mm_cpumask(next)); 74 if(next != &init_mm) 75 __switch_mm(&next->context.id); 76 } 77 } 78 79 static inline void enter_lazy_tlb(struct mm_struct *mm, 80 struct task_struct *tsk) 81 { 82 } 83 84 extern int init_new_context(struct task_struct *task, struct mm_struct *mm); 85 86 extern void destroy_context(struct mm_struct *mm); 87 88 #endif 89