projects / mirror_ubuntu-zesty-kernel.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 | 4 | |
| 5e696617 BH |
5 | #include <linux/kernel.h> |
| 6 | #include <linux/mm.h> | |
| 7 | #include <linux/sched.h> | |
| 8 | #include <linux/spinlock.h> | |
| 80a7cc6c KG |
9 | #include <asm/mmu.h> |
| 10 | #include <asm/cputable.h> | |
| 11 | #include <asm-generic/mm_hooks.h> | |
| 5e696617 | 12 | #include <asm/cputhreads.h> |
| 80a7cc6c KG |
13 | |
| 14 | /* | |
| 5e696617 | 15 | * Most if the context management is out of line |
| 80a7cc6c | 16 | */ |
| 80a7cc6c | 17 | extern void mmu_context_init(void); |
| 1da177e4 LT |
18 | extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); |
| 19 | extern void destroy_context(struct mm_struct *mm); | |
| 20 | ||
| 5e696617 | 21 | extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next); |
| 1da177e4 LT |
22 | extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm); |
| 23 | extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); | |
| 5e696617 | 24 | extern void set_context(unsigned long id, pgd_t *pgd); |
| 1da177e4 LT |
25 | |
| 26 | /* | |
| 27 | * switch_mm is the entry point called from the architecture independent | |
| 28 | * code in kernel/sched.c | |
| 29 | */ | |
| 30 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
| 31 | struct task_struct *tsk) | |
| 32 | { | |
| 5e696617 | 33 | /* Mark this context has been used on the new CPU */ |
| 56aa4129 | 34 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); |
| 5e696617 BH |
35 | |
| 36 | /* 32-bit keeps track of the current PGDIR in the thread struct */ | |
| 37 | #ifdef CONFIG_PPC32 | |
| 38 | tsk->thread.pgdir = next->pgd; | |
| 39 | #endif /* CONFIG_PPC32 */ | |
| 1da177e4 | 40 | |
| 5e696617 | 41 | /* Nothing else to do if we aren't actually switching */ |
| 1da177e4 LT |
42 | if (prev == next) |
| 43 | return; | |
| 44 | ||
| 5e696617 BH |
45 | /* We must stop all altivec streams before changing the HW |
| 46 | * context | |
| 47 | */ | |
| 1da177e4 LT |
48 | #ifdef CONFIG_ALTIVEC |
| 49 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
| 50 | asm volatile ("dssall"); | |
| 51 | #endif /* CONFIG_ALTIVEC */ | |
| 52 | ||
| 5e696617 BH |
53 | /* The actual HW switching method differs between the various |
| 54 | * sub architectures. | |
| 55 | */ | |
| 56 | #ifdef CONFIG_PPC_STD_MMU_64 | |
| 1da177e4 LT |
57 | if (cpu_has_feature(CPU_FTR_SLB)) |
| 58 | switch_slb(tsk, next); | |
| 59 | else | |
| 60 | switch_stab(tsk, next); | |
| 5e696617 BH |
61 | #else |
| 62 | /* Out of line for now */ | |
| 63 | switch_mmu_context(prev, next); | |
| 64 | #endif | |
| 65 | ||
| 1da177e4 LT |
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 | ||
| 5e696617 BH |
83 | /* We don't currently use enter_lazy_tlb() for anything */ |
| 84 | static inline void enter_lazy_tlb(struct mm_struct *mm, | |
| 85 | struct task_struct *tsk) | |
| 86 | { | |
| 87 | } | |
| 88 | ||
| 88ced031 | 89 | #endif /* __KERNEL__ */ |
| 047ea784 | 90 | #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |