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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2002 Jeff Dike (jdike@karaya.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 "choose-mode.h" | |
d67b569f | 11 | #include "um_mmu.h" |
1da177e4 LT |
12 | |
13 | #define get_mmu_context(task) do ; while(0) | |
14 | #define activate_context(tsk) do ; while(0) | |
15 | ||
16 | #define deactivate_mm(tsk,mm) do { } while (0) | |
17 | ||
c40504e8 BL |
18 | extern void force_flush_all(void); |
19 | ||
1da177e4 LT |
20 | static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) |
21 | { | |
1e40cd38 PBG |
22 | /* |
23 | * This is called by fs/exec.c and fs/aio.c. In the first case, for an | |
24 | * exec, we don't need to do anything as we're called from userspace | |
25 | * and thus going to use a new host PID. In the second, we're called | |
26 | * from a kernel thread, and thus need to go doing the mmap's on the | |
27 | * host. Since they're very expensive, we want to avoid that as far as | |
28 | * possible. | |
29 | */ | |
30 | if (old != new && (current->flags & PF_BORROWED_MM)) | |
e763b793 BL |
31 | CHOOSE_MODE(force_flush_all(), |
32 | switch_mm_skas(&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) | |
44 | CHOOSE_MODE((void) 0, | |
d67b569f | 45 | switch_mm_skas(&next->context.skas.id)); |
1da177e4 LT |
46 | } |
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_skas(struct task_struct *task, | |
55 | struct mm_struct *mm); | |
56 | ||
57 | static inline int init_new_context_tt(struct task_struct *task, | |
58 | struct mm_struct *mm) | |
59 | { | |
60 | return(0); | |
61 | } | |
62 | ||
63 | static inline int init_new_context(struct task_struct *task, | |
64 | struct mm_struct *mm) | |
65 | { | |
66 | return(CHOOSE_MODE_PROC(init_new_context_tt, init_new_context_skas, | |
67 | task, mm)); | |
68 | } | |
69 | ||
70 | extern void destroy_context_skas(struct mm_struct *mm); | |
71 | ||
72 | static inline void destroy_context(struct mm_struct *mm) | |
73 | { | |
74 | CHOOSE_MODE((void) 0, destroy_context_skas(mm)); | |
75 | } | |
76 | ||
77 | #endif | |
78 | ||
79 | /* | |
80 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
81 | * Emacs will notice this stuff at the end of the file and automatically | |
82 | * adjust the settings for this buffer only. This must remain at the end | |
83 | * of the file. | |
84 | * --------------------------------------------------------------------------- | |
85 | * Local variables: | |
86 | * c-file-style: "linux" | |
87 | * End: | |
88 | */ |