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 "um_mmu.h"
11
12extern void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
 
 
 
 
 
 
 
13extern void arch_exit_mmap(struct mm_struct *mm);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
14
15#define get_mmu_context(task) do ; while(0)
16#define activate_context(tsk) do ; while(0)
 
17
18#define deactivate_mm(tsk,mm)	do { } while (0)
19
20extern void force_flush_all(void);
21
22static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
23{
24	/*
25	 * This is called by fs/exec.c and sys_unshare()
26	 * when the new ->mm is used for the first time.
27	 */
28	__switch_mm(&new->context.id);
29	arch_dup_mmap(old, new);
 
 
30}
31
32static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
33			     struct task_struct *tsk)
34{
35	unsigned cpu = smp_processor_id();
36
37	if(prev != next){
38		cpumask_clear_cpu(cpu, mm_cpumask(prev));
39		cpumask_set_cpu(cpu, mm_cpumask(next));
40		if(next != &init_mm)
41			__switch_mm(&next->context.id);
42	}
43}
44
45static inline void enter_lazy_tlb(struct mm_struct *mm, 
46				  struct task_struct *tsk)
47{
48}
49
50extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
51
52extern void destroy_context(struct mm_struct *mm);
53
54#endif

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