xref: /openbmc/linux/arch/um/include/asm/mmu_context.h (revision b34e08d5)
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 
12 extern void uml_setup_stubs(struct mm_struct *mm);
13 extern void arch_exit_mmap(struct mm_struct *mm);
14 
15 #define deactivate_mm(tsk,mm)	do { } while (0)
16 
17 extern void force_flush_all(void);
18 
19 static 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 	down_write(&new->mmap_sem);
27 	uml_setup_stubs(new);
28 	up_write(&new->mmap_sem);
29 }
30 
31 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
32 			     struct task_struct *tsk)
33 {
34 	unsigned cpu = smp_processor_id();
35 
36 	if(prev != next){
37 		cpumask_clear_cpu(cpu, mm_cpumask(prev));
38 		cpumask_set_cpu(cpu, mm_cpumask(next));
39 		if(next != &init_mm)
40 			__switch_mm(&next->context.id);
41 	}
42 }
43 
44 static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
45 {
46 	uml_setup_stubs(mm);
47 }
48 
49 static inline void enter_lazy_tlb(struct mm_struct *mm,
50 				  struct task_struct *tsk)
51 {
52 }
53 
54 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
55 
56 extern void destroy_context(struct mm_struct *mm);
57 
58 #endif
59