projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef __PPC64_MMU_CONTEXT_H |
| 2 | #define __PPC64_MMU_CONTEXT_H | |
| 3 | ||
| 4 | #include <linux/config.h> | |
| 5 | #include <linux/kernel.h> | |
| 6 | #include <linux/mm.h> | |
| 7 | #include <asm/mmu.h> | |
| 8 | #include <asm/cputable.h> | |
| 9 | ||
| 10 | /* | |
| 11 | * Copyright (C) 2001 PPC 64 Team, IBM Corp | |
| 12 | * | |
| 13 | * This program is free software; you can redistribute it and/or | |
| 14 | * modify it under the terms of the GNU General Public License | |
| 15 | * as published by the Free Software Foundation; either version | |
| 16 | * 2 of the License, or (at your option) any later version. | |
| 17 | */ | |
| 18 | ||
| 3c726f8d BH |
19 | /* |
| 20 | * Getting into a kernel thread, there is no valid user segment, mark | |
| 21 | * paca->pgdir NULL so that SLB miss on user addresses will fault | |
| 22 | */ | |
| 23 | static inline void enter_lazy_tlb(struct mm_struct *mm, | |
| 24 | struct task_struct *tsk) | |
| 1da177e4 | 25 | { |
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26 | #ifdef CONFIG_PPC_64K_PAGES |
| 27 | get_paca()->pgdir = NULL; | |
| 28 | #endif /* CONFIG_PPC_64K_PAGES */ | |
| 1da177e4 LT |
29 | } |
| 30 | ||
| 31 | #define NO_CONTEXT 0 | |
| 32 | #define MAX_CONTEXT (0x100000-1) | |
| 33 | ||
| 34 | extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); | |
| 35 | extern void destroy_context(struct mm_struct *mm); | |
| 36 | ||
| 37 | extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm); | |
| 38 | extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); | |
| 39 | ||
| 40 | /* | |
| 41 | * switch_mm is the entry point called from the architecture independent | |
| 42 | * code in kernel/sched.c | |
| 43 | */ | |
| 44 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
| 45 | struct task_struct *tsk) | |
| 46 | { | |
| 47 | if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask)) | |
| 48 | cpu_set(smp_processor_id(), next->cpu_vm_mask); | |
| 49 | ||
| 50 | /* No need to flush userspace segments if the mm doesnt change */ | |
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51 | #ifdef CONFIG_PPC_64K_PAGES |
| 52 | if (prev == next && get_paca()->pgdir == next->pgd) | |
| 53 | return; | |
| 54 | #else | |
| 1da177e4 LT |
55 | if (prev == next) |
| 56 | return; | |
| 3c726f8d | 57 | #endif /* CONFIG_PPC_64K_PAGES */ |
| 1da177e4 LT |
58 | |
| 59 | #ifdef CONFIG_ALTIVEC | |
| 60 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
| 61 | asm volatile ("dssall"); | |
| 62 | #endif /* CONFIG_ALTIVEC */ | |
| 63 | ||
| 64 | if (cpu_has_feature(CPU_FTR_SLB)) | |
| 65 | switch_slb(tsk, next); | |
| 66 | else | |
| 67 | switch_stab(tsk, next); | |
| 68 | } | |
| 69 | ||
| 70 | #define deactivate_mm(tsk,mm) do { } while (0) | |
| 71 | ||
| 72 | /* | |
| 73 | * After we have set current->mm to a new value, this activates | |
| 74 | * the context for the new mm so we see the new mappings. | |
| 75 | */ | |
| 76 | static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) | |
| 77 | { | |
| 78 | unsigned long flags; | |
| 79 | ||
| 80 | local_irq_save(flags); | |
| 81 | switch_mm(prev, next, current); | |
| 82 | local_irq_restore(flags); | |
| 83 | } | |
| 84 | ||
| 1da177e4 | 85 | #endif /* __PPC64_MMU_CONTEXT_H */ |