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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
40extern void force_flush_all(void);
41
42#define activate_mm activate_mm
43static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
44{
45 /*
46 * This is called by fs/exec.c and sys_unshare()
47 * when the new ->mm is used for the first time.
48 */
49 __switch_mm(&new->context.id);
50 mmap_write_lock_nested(new, SINGLE_DEPTH_NESTING);
51 uml_setup_stubs(new);
52 mmap_write_unlock(new);
53}
54
55static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
56 struct task_struct *tsk)
57{
58 unsigned cpu = smp_processor_id();
59
60 if(prev != next){
61 cpumask_clear_cpu(cpu, mm_cpumask(prev));
62 cpumask_set_cpu(cpu, mm_cpumask(next));
63 if(next != &init_mm)
64 __switch_mm(&next->context.id);
65 }
66}
67
68#define init_new_context init_new_context
69extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
70
71#define destroy_context destroy_context
72extern void destroy_context(struct mm_struct *mm);
73
74#include <asm-generic/mmu_context.h>
75
76#endif