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Commit | Line | Data |
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1da177e4 | 1 | /* |
ba180fd4 | 2 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
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" | |
d67b569f | 10 | #include "um_mmu.h" |
1da177e4 | 11 | |
3963333f JD |
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 | ||
1da177e4 LT |
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 | ||
c40504e8 BL |
20 | extern void force_flush_all(void); |
21 | ||
1da177e4 LT |
22 | static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) |
23 | { | |
1e40cd38 PBG |
24 | /* |
25 | * This is called by fs/exec.c and fs/aio.c. In the first case, for an | |
26 | * exec, we don't need to do anything as we're called from userspace | |
27 | * and thus going to use a new host PID. In the second, we're called | |
28 | * from a kernel thread, and thus need to go doing the mmap's on the | |
29 | * host. Since they're very expensive, we want to avoid that as far as | |
30 | * possible. | |
31 | */ | |
32 | if (old != new && (current->flags & PF_BORROWED_MM)) | |
6c738ffa | 33 | __switch_mm(&new->context.id); |
3963333f JD |
34 | |
35 | arch_dup_mmap(old, new); | |
1da177e4 LT |
36 | } |
37 | ||
1da177e4 LT |
38 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
39 | struct task_struct *tsk) | |
40 | { | |
41 | unsigned cpu = smp_processor_id(); | |
42 | ||
43 | if(prev != next){ | |
44 | cpu_clear(cpu, prev->cpu_vm_mask); | |
45 | cpu_set(cpu, next->cpu_vm_mask); | |
46 | if(next != &init_mm) | |
6c738ffa | 47 | __switch_mm(&next->context.id); |
1da177e4 LT |
48 | } |
49 | } | |
50 | ||
51 | static inline void enter_lazy_tlb(struct mm_struct *mm, | |
52 | struct task_struct *tsk) | |
53 | { | |
54 | } | |
55 | ||
77bf4400 | 56 | extern int init_new_context(struct task_struct *task, struct mm_struct *mm); |
1da177e4 | 57 | |
77bf4400 | 58 | extern void destroy_context(struct mm_struct *mm); |
1da177e4 LT |
59 | |
60 | #endif |