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Linux kernel mirror (for testing)
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kernel
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linux
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
14extern void uml_setup_stubs(struct mm_struct *mm);
15/*
16 * Needed since we do not use the asm-generic/mm_hooks.h:
17 */
18static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
19{
20 uml_setup_stubs(mm);
21 return 0;
22}
23extern void arch_exit_mmap(struct mm_struct *mm);
24static inline void arch_unmap(struct mm_struct *mm,
25 struct vm_area_struct *vma,
26 unsigned long start, unsigned long end)
27{
28}
29static inline void arch_bprm_mm_init(struct mm_struct *mm,
30 struct vm_area_struct *vma)
31{
32}
33
34static 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
47extern void force_flush_all(void);
48
49static 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(&new->mmap_sem);
57 uml_setup_stubs(new);
58 up_write(&new->mmap_sem);
59}
60
61static 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
74static inline void enter_lazy_tlb(struct mm_struct *mm,
75 struct task_struct *tsk)
76{
77}
78
79extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
80
81extern void destroy_context(struct mm_struct *mm);
82
83#endif