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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 void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
19{
20 uml_setup_stubs(mm);
21}
22extern void arch_exit_mmap(struct mm_struct *mm);
23static inline void arch_unmap(struct mm_struct *mm,
24 struct vm_area_struct *vma,
25 unsigned long start, unsigned long end)
26{
27}
28static inline void arch_bprm_mm_init(struct mm_struct *mm,
29 struct vm_area_struct *vma)
30{
31}
32
33static 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
40static 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
52extern void force_flush_all(void);
53
54static 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
66static 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
79static inline void enter_lazy_tlb(struct mm_struct *mm,
80 struct task_struct *tsk)
81{
82}
83
84extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
85
86extern void destroy_context(struct mm_struct *mm);
87
88#endif