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
15 extern void uml_setup_stubs(struct mm_struct *mm);
16 /*
17 * Needed since we do not use the asm-generic/mm_hooks.h:
18 */
arch_dup_mmap(struct mm_struct * oldmm,struct mm_struct * mm)19 static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
20 {
21 uml_setup_stubs(mm);
22 return 0;
23 }
24 extern void arch_exit_mmap(struct mm_struct *mm);
arch_unmap(struct mm_struct * mm,unsigned long start,unsigned long end)25 static inline void arch_unmap(struct mm_struct *mm,
26 unsigned long start, unsigned long end)
27 {
28 }
arch_vma_access_permitted(struct vm_area_struct * vma,bool write,bool execute,bool foreign)29 static 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
42 extern void force_flush_all(void);
43
activate_mm(struct mm_struct * old,struct mm_struct * new)44 static 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
switch_mm(struct mm_struct * prev,struct mm_struct * next,struct task_struct * tsk)56 static 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
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)69 static inline void enter_lazy_tlb(struct mm_struct *mm,
70 struct task_struct *tsk)
71 {
72 }
73
74 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
75
76 extern void destroy_context(struct mm_struct *mm);
77
78 #endif
79
