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1 | #ifndef __ASM_POWERPC_MMU_CONTEXT_H |
2 | #define __ASM_POWERPC_MMU_CONTEXT_H | |
3 | ||
4 | #ifndef CONFIG_PPC64 | |
5 | #include <asm-ppc/mmu_context.h> | |
6 | #else | |
1da177e4 | 7 | |
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8 | #include <linux/kernel.h> |
9 | #include <linux/mm.h> | |
10 | #include <asm/mmu.h> | |
11 | #include <asm/cputable.h> | |
12 | ||
13 | /* | |
14 | * Copyright (C) 2001 PPC 64 Team, IBM Corp | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | */ | |
21 | ||
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22 | /* |
23 | * Getting into a kernel thread, there is no valid user segment, mark | |
24 | * paca->pgdir NULL so that SLB miss on user addresses will fault | |
25 | */ | |
26 | static inline void enter_lazy_tlb(struct mm_struct *mm, | |
27 | struct task_struct *tsk) | |
1da177e4 | 28 | { |
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29 | #ifdef CONFIG_PPC_64K_PAGES |
30 | get_paca()->pgdir = NULL; | |
31 | #endif /* CONFIG_PPC_64K_PAGES */ | |
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32 | } |
33 | ||
34 | #define NO_CONTEXT 0 | |
35 | #define MAX_CONTEXT (0x100000-1) | |
36 | ||
37 | extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); | |
38 | extern void destroy_context(struct mm_struct *mm); | |
39 | ||
40 | extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm); | |
41 | extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); | |
42 | ||
43 | /* | |
44 | * switch_mm is the entry point called from the architecture independent | |
45 | * code in kernel/sched.c | |
46 | */ | |
47 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
48 | struct task_struct *tsk) | |
49 | { | |
50 | if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask)) | |
51 | cpu_set(smp_processor_id(), next->cpu_vm_mask); | |
52 | ||
53 | /* No need to flush userspace segments if the mm doesnt change */ | |
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54 | #ifdef CONFIG_PPC_64K_PAGES |
55 | if (prev == next && get_paca()->pgdir == next->pgd) | |
56 | return; | |
57 | #else | |
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58 | if (prev == next) |
59 | return; | |
3c726f8d | 60 | #endif /* CONFIG_PPC_64K_PAGES */ |
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61 | |
62 | #ifdef CONFIG_ALTIVEC | |
63 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
64 | asm volatile ("dssall"); | |
65 | #endif /* CONFIG_ALTIVEC */ | |
66 | ||
67 | if (cpu_has_feature(CPU_FTR_SLB)) | |
68 | switch_slb(tsk, next); | |
69 | else | |
70 | switch_stab(tsk, next); | |
71 | } | |
72 | ||
73 | #define deactivate_mm(tsk,mm) do { } while (0) | |
74 | ||
75 | /* | |
76 | * After we have set current->mm to a new value, this activates | |
77 | * the context for the new mm so we see the new mappings. | |
78 | */ | |
79 | static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) | |
80 | { | |
81 | unsigned long flags; | |
82 | ||
83 | local_irq_save(flags); | |
84 | switch_mm(prev, next, current); | |
85 | local_irq_restore(flags); | |
86 | } | |
87 | ||
047ea784 PM |
88 | #endif /* CONFIG_PPC64 */ |
89 | #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |