Paul Mackerras | 047ea78 | 2005-11-19 20:17:32 +1100 | [diff] [blame] | 1 | #ifndef __ASM_POWERPC_MMU_CONTEXT_H |
| 2 | #define __ASM_POWERPC_MMU_CONTEXT_H |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 3 | #ifdef __KERNEL__ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | |
Paul Mackerras | 047ea78 | 2005-11-19 20:17:32 +1100 | [diff] [blame] | 5 | #ifndef CONFIG_PPC64 |
| 6 | #include <asm-ppc/mmu_context.h> |
| 7 | #else |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 30 | #ifdef CONFIG_PPC_64K_PAGES |
| 31 | get_paca()->pgdir = NULL; |
| 32 | #endif /* CONFIG_PPC_64K_PAGES */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 55 | #ifdef CONFIG_PPC_64K_PAGES |
| 56 | if (prev == next && get_paca()->pgdir == next->pgd) |
| 57 | return; |
| 58 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | if (prev == next) |
| 60 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 61 | #endif /* CONFIG_PPC_64K_PAGES */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Paul Mackerras | 047ea78 | 2005-11-19 20:17:32 +1100 | [diff] [blame] | 89 | #endif /* CONFIG_PPC64 */ |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 90 | #endif /* __KERNEL__ */ |
Paul Mackerras | 047ea78 | 2005-11-19 20:17:32 +1100 | [diff] [blame] | 91 | #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |