projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 047ea784 PM |
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 | |
| 1da177e4 LT |
9 | #include <linux/kernel.h> |
| 10 | #include <linux/mm.h> | |
| 11 | #include <asm/mmu.h> | |
| 12 | #include <asm/cputable.h> | |
| d6dd61c8 | 13 | #include <asm-generic/mm_hooks.h> |
| 1da177e4 LT |
14 | |
| 15 | /* | |
| 16 | * Copyright (C) 2001 PPC 64 Team, IBM Corp | |
| 17 | * | |
| 18 | * This program is free software; you can redistribute it and/or | |
| 19 | * modify it under the terms of the GNU General Public License | |
| 20 | * as published by the Free Software Foundation; either version | |
| 21 | * 2 of the License, or (at your option) any later version. | |
| 22 | */ | |
| 23 | ||
| 3c726f8d BH |
24 | static inline void enter_lazy_tlb(struct mm_struct *mm, |
| 25 | struct task_struct *tsk) | |
| 1da177e4 LT |
26 | { |
| 27 | } | |
| 28 | ||
| 1729dc78 PM |
29 | /* |
| 30 | * The proto-VSID space has 2^35 - 1 segments available for user mappings. | |
| 31 | * Each segment contains 2^28 bytes. Each context maps 2^44 bytes, | |
| 32 | * so we can support 2^19-1 contexts (19 == 35 + 28 - 44). | |
| 33 | */ | |
| 1da177e4 | 34 | #define NO_CONTEXT 0 |
| 1729dc78 | 35 | #define MAX_CONTEXT ((1UL << 19) - 1) |
| 1da177e4 LT |
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 */ | |
| 54 | if (prev == next) | |
| 55 | return; | |
| 56 | ||
| 57 | #ifdef CONFIG_ALTIVEC | |
| 58 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
| 59 | asm volatile ("dssall"); | |
| 60 | #endif /* CONFIG_ALTIVEC */ | |
| 61 | ||
| 62 | if (cpu_has_feature(CPU_FTR_SLB)) | |
| 63 | switch_slb(tsk, next); | |
| 64 | else | |
| 65 | switch_stab(tsk, next); | |
| 66 | } | |
| 67 | ||
| 68 | #define deactivate_mm(tsk,mm) do { } while (0) | |
| 69 | ||
| 70 | /* | |
| 71 | * After we have set current->mm to a new value, this activates | |
| 72 | * the context for the new mm so we see the new mappings. | |
| 73 | */ | |
| 74 | static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) | |
| 75 | { | |
| 76 | unsigned long flags; | |
| 77 | ||
| 78 | local_irq_save(flags); | |
| 79 | switch_mm(prev, next, current); | |
| 80 | local_irq_restore(flags); | |
| 81 | } | |
| 82 | ||
| 047ea784 | 83 | #endif /* CONFIG_PPC64 */ |
| 88ced031 | 84 | #endif /* __KERNEL__ */ |
| 047ea784 | 85 | #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |