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/mm_hooks.h>
14#include <asm/mmu.h>
15
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
16extern void force_flush_all(void);
17
18#define activate_mm activate_mm
19static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
20{
21	/*
22	 * This is called by fs/exec.c and sys_unshare()
23	 * when the new ->mm is used for the first time.
24	 */
25	__switch_mm(&new->context.id);
 
 
 
26}
27
28static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
29			     struct task_struct *tsk)
30{
31	unsigned cpu = smp_processor_id();
32
33	if(prev != next){
34		cpumask_clear_cpu(cpu, mm_cpumask(prev));
35		cpumask_set_cpu(cpu, mm_cpumask(next));
36		if(next != &init_mm)
37			__switch_mm(&next->context.id);
38	}
39}
40
41#define init_new_context init_new_context
 
 
 
 
42extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
43
44#define destroy_context destroy_context
45extern void destroy_context(struct mm_struct *mm);
46
47#include <asm-generic/mmu_context.h>
48
49#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