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1 | #ifndef __ASM_POWERPC_MMU_CONTEXT_H |
2 | #define __ASM_POWERPC_MMU_CONTEXT_H | |
88ced031 | 3 | #ifdef __KERNEL__ |
047ea784 PM |
4 | |
5 | #ifndef CONFIG_PPC64 | |
6 | #include <asm-ppc/mmu_context.h> | |
7 | #else | |
1da177e4 | 8 | |
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9 | #include <linux/kernel.h> |
10 | #include <linux/mm.h> | |
11 | #include <asm/mmu.h> | |
12 | #include <asm/cputable.h> | |
13 | ||
14 | /* | |
15 | * Copyright (C) 2001 PPC 64 Team, IBM Corp | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License | |
19 | * as published by the Free Software Foundation; either version | |
20 | * 2 of the License, or (at your option) any later version. | |
21 | */ | |
22 | ||
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23 | /* |
24 | * Getting into a kernel thread, there is no valid user segment, mark | |
25 | * paca->pgdir NULL so that SLB miss on user addresses will fault | |
26 | */ | |
27 | static inline void enter_lazy_tlb(struct mm_struct *mm, | |
28 | struct task_struct *tsk) | |
1da177e4 | 29 | { |
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30 | #ifdef CONFIG_PPC_64K_PAGES |
31 | get_paca()->pgdir = NULL; | |
32 | #endif /* CONFIG_PPC_64K_PAGES */ | |
1da177e4 LT |
33 | } |
34 | ||
35 | #define NO_CONTEXT 0 | |
36 | #define MAX_CONTEXT (0x100000-1) | |
37 | ||
38 | extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); | |
39 | extern void destroy_context(struct mm_struct *mm); | |
40 | ||
41 | extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm); | |
42 | extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); | |
43 | ||
44 | /* | |
45 | * switch_mm is the entry point called from the architecture independent | |
46 | * code in kernel/sched.c | |
47 | */ | |
48 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
49 | struct task_struct *tsk) | |
50 | { | |
51 | if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask)) | |
52 | cpu_set(smp_processor_id(), next->cpu_vm_mask); | |
53 | ||
54 | /* No need to flush userspace segments if the mm doesnt change */ | |
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55 | #ifdef CONFIG_PPC_64K_PAGES |
56 | if (prev == next && get_paca()->pgdir == next->pgd) | |
57 | return; | |
58 | #else | |
1da177e4 LT |
59 | if (prev == next) |
60 | return; | |
3c726f8d | 61 | #endif /* CONFIG_PPC_64K_PAGES */ |
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62 | |
63 | #ifdef CONFIG_ALTIVEC | |
64 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
65 | asm volatile ("dssall"); | |
66 | #endif /* CONFIG_ALTIVEC */ | |
67 | ||
68 | if (cpu_has_feature(CPU_FTR_SLB)) | |
69 | switch_slb(tsk, next); | |
70 | else | |
71 | switch_stab(tsk, next); | |
72 | } | |
73 | ||
74 | #define deactivate_mm(tsk,mm) do { } while (0) | |
75 | ||
76 | /* | |
77 | * After we have set current->mm to a new value, this activates | |
78 | * the context for the new mm so we see the new mappings. | |
79 | */ | |
80 | static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) | |
81 | { | |
82 | unsigned long flags; | |
83 | ||
84 | local_irq_save(flags); | |
85 | switch_mm(prev, next, current); | |
86 | local_irq_restore(flags); | |
87 | } | |
88 | ||
047ea784 | 89 | #endif /* CONFIG_PPC64 */ |
88ced031 | 90 | #endif /* __KERNEL__ */ |
047ea784 | 91 | #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |