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