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 */
arch_dup_mmap(struct mm_struct * oldmm,struct mm_struct * mm)18 static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
19 {
20 uml_setup_stubs(mm);
21 return 0;
22 }
23 extern void arch_exit_mmap(struct mm_struct *mm);
arch_unmap(struct mm_struct * mm,struct vm_area_struct * vma,unsigned long start,unsigned long end)24 static inline void arch_unmap(struct mm_struct *mm,
25 struct vm_area_struct *vma,
26 unsigned long start, unsigned long end)
27 {
28 }
arch_bprm_mm_init(struct mm_struct * mm,struct vm_area_struct * vma)29 static inline void arch_bprm_mm_init(struct mm_struct *mm,
30 struct vm_area_struct *vma)
31 {
32 }
33
arch_vma_access_permitted(struct vm_area_struct * vma,bool write,bool execute,bool foreign)34 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
35 bool write, bool execute, bool foreign)
36 {
37 /* by default, allow everything */
38 return true;
39 }
40
41 /*
42 * end asm-generic/mm_hooks.h functions
43 */
44
45 #define deactivate_mm(tsk,mm) do { } while (0)
46
47 extern void force_flush_all(void);
48
activate_mm(struct mm_struct * old,struct mm_struct * new)49 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
50 {
51 /*
52 * This is called by fs/exec.c and sys_unshare()
53 * when the new ->mm is used for the first time.
54 */
55 __switch_mm(&new->context.id);
56 down_write_nested(&new->mmap_sem, 1);
57 uml_setup_stubs(new);
58 up_write(&new->mmap_sem);
59 }
60
switch_mm(struct mm_struct * prev,struct mm_struct * next,struct task_struct * tsk)61 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
62 struct task_struct *tsk)
63 {
64 unsigned cpu = smp_processor_id();
65
66 if(prev != next){
67 cpumask_clear_cpu(cpu, mm_cpumask(prev));
68 cpumask_set_cpu(cpu, mm_cpumask(next));
69 if(next != &init_mm)
70 __switch_mm(&next->context.id);
71 }
72 }
73
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)74 static inline void enter_lazy_tlb(struct mm_struct *mm,
75 struct task_struct *tsk)
76 {
77 }
78
79 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
80
81 extern void destroy_context(struct mm_struct *mm);
82
83 #endif
84