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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 | ||
d6dd61c8 JF |
9 | #include <asm-generic/mm_hooks.h> |
10 | ||
1da177e4 | 11 | #include "linux/sched.h" |
d67b569f | 12 | #include "um_mmu.h" |
1da177e4 LT |
13 | |
14 | #define get_mmu_context(task) do ; while(0) | |
15 | #define activate_context(tsk) do ; while(0) | |
16 | ||
17 | #define deactivate_mm(tsk,mm) do { } while (0) | |
18 | ||
c40504e8 BL |
19 | extern void force_flush_all(void); |
20 | ||
1da177e4 LT |
21 | static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) |
22 | { | |
1e40cd38 PBG |
23 | /* |
24 | * This is called by fs/exec.c and fs/aio.c. In the first case, for an | |
25 | * exec, we don't need to do anything as we're called from userspace | |
26 | * and thus going to use a new host PID. In the second, we're called | |
27 | * from a kernel thread, and thus need to go doing the mmap's on the | |
28 | * host. Since they're very expensive, we want to avoid that as far as | |
29 | * possible. | |
30 | */ | |
31 | if (old != new && (current->flags & PF_BORROWED_MM)) | |
77bf4400 | 32 | __switch_mm(&new->context.skas.id); |
1da177e4 LT |
33 | } |
34 | ||
1da177e4 LT |
35 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
36 | struct task_struct *tsk) | |
37 | { | |
38 | unsigned cpu = smp_processor_id(); | |
39 | ||
40 | if(prev != next){ | |
41 | cpu_clear(cpu, prev->cpu_vm_mask); | |
42 | cpu_set(cpu, next->cpu_vm_mask); | |
43 | if(next != &init_mm) | |
77bf4400 | 44 | __switch_mm(&next->context.skas.id); |
1da177e4 LT |
45 | } |
46 | } | |
47 | ||
48 | static inline void enter_lazy_tlb(struct mm_struct *mm, | |
49 | struct task_struct *tsk) | |
50 | { | |
51 | } | |
52 | ||
77bf4400 | 53 | extern int init_new_context(struct task_struct *task, struct mm_struct *mm); |
1da177e4 | 54 | |
77bf4400 | 55 | extern void destroy_context(struct mm_struct *mm); |
1da177e4 LT |
56 | |
57 | #endif |