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

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/* 
 3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 
 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			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
40/*
41 * end asm-generic/mm_hooks.h functions
42 */
43
44#define deactivate_mm(tsk,mm)	do { } while (0)
45
46extern void force_flush_all(void);
47
48static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
49{
50	/*
51	 * This is called by fs/exec.c and sys_unshare()
52	 * when the new ->mm is used for the first time.
53	 */
54	__switch_mm(&new->context.id);
55	down_write_nested(&new->mmap_sem, 1);
56	uml_setup_stubs(new);
57	up_write(&new->mmap_sem);
58}
59
60static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
61			     struct task_struct *tsk)
62{
63	unsigned cpu = smp_processor_id();
64
65	if(prev != next){
66		cpumask_clear_cpu(cpu, mm_cpumask(prev));
67		cpumask_set_cpu(cpu, mm_cpumask(next));
68		if(next != &init_mm)
69			__switch_mm(&next->context.id);
70	}
71}
72
73static inline void enter_lazy_tlb(struct mm_struct *mm, 
74				  struct task_struct *tsk)
75{
76}
77
78extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
79
80extern void destroy_context(struct mm_struct *mm);
81
82#endif