xref: /openbmc/linux/arch/um/include/asm/mmu_context.h (revision 9ac8d3fb)
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 "um_mmu.h"
11 
12 extern void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
13 extern void arch_exit_mmap(struct mm_struct *mm);
14 
15 #define get_mmu_context(task) do ; while(0)
16 #define activate_context(tsk) do ; while(0)
17 
18 #define deactivate_mm(tsk,mm)	do { } while (0)
19 
20 extern void force_flush_all(void);
21 
22 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
23 {
24 	/*
25 	 * This is called by fs/exec.c and sys_unshare()
26 	 * when the new ->mm is used for the first time.
27 	 */
28 	__switch_mm(&new->context.id);
29 	arch_dup_mmap(old, new);
30 }
31 
32 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
33 			     struct task_struct *tsk)
34 {
35 	unsigned cpu = smp_processor_id();
36 
37 	if(prev != next){
38 		cpu_clear(cpu, prev->cpu_vm_mask);
39 		cpu_set(cpu, next->cpu_vm_mask);
40 		if(next != &init_mm)
41 			__switch_mm(&next->context.id);
42 	}
43 }
44 
45 static inline void enter_lazy_tlb(struct mm_struct *mm,
46 				  struct task_struct *tsk)
47 {
48 }
49 
50 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
51 
52 extern void destroy_context(struct mm_struct *mm);
53 
54 #endif
55