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/* 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