1 #ifndef __ASM_POWERPC_MMU_CONTEXT_H 2 #define __ASM_POWERPC_MMU_CONTEXT_H 3 #ifdef __KERNEL__ 4 5 #include <linux/kernel.h> 6 #include <linux/mm.h> 7 #include <linux/sched.h> 8 #include <linux/spinlock.h> 9 #include <asm/mmu.h> 10 #include <asm/cputable.h> 11 #include <asm-generic/mm_hooks.h> 12 #include <asm/cputhreads.h> 13 14 /* 15 * Most if the context management is out of line 16 */ 17 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); 18 extern void destroy_context(struct mm_struct *mm); 19 20 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next); 21 extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm); 22 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 23 extern void set_context(unsigned long id, pgd_t *pgd); 24 25 #ifdef CONFIG_PPC_BOOK3S_64 26 extern int __init_new_context(void); 27 extern void __destroy_context(int context_id); 28 static inline void mmu_context_init(void) { } 29 #else 30 extern void mmu_context_init(void); 31 #endif 32 33 /* 34 * switch_mm is the entry point called from the architecture independent 35 * code in kernel/sched.c 36 */ 37 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 38 struct task_struct *tsk) 39 { 40 /* Mark this context has been used on the new CPU */ 41 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); 42 43 /* 32-bit keeps track of the current PGDIR in the thread struct */ 44 #ifdef CONFIG_PPC32 45 tsk->thread.pgdir = next->pgd; 46 #endif /* CONFIG_PPC32 */ 47 48 /* 64-bit Book3E keeps track of current PGD in the PACA */ 49 #ifdef CONFIG_PPC_BOOK3E_64 50 get_paca()->pgd = next->pgd; 51 #endif 52 /* Nothing else to do if we aren't actually switching */ 53 if (prev == next) 54 return; 55 56 /* We must stop all altivec streams before changing the HW 57 * context 58 */ 59 #ifdef CONFIG_ALTIVEC 60 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 61 asm volatile ("dssall"); 62 #endif /* CONFIG_ALTIVEC */ 63 64 /* The actual HW switching method differs between the various 65 * sub architectures. 66 */ 67 #ifdef CONFIG_PPC_STD_MMU_64 68 if (cpu_has_feature(CPU_FTR_SLB)) 69 switch_slb(tsk, next); 70 else 71 switch_stab(tsk, next); 72 #else 73 /* Out of line for now */ 74 switch_mmu_context(prev, next); 75 #endif 76 77 } 78 79 #define deactivate_mm(tsk,mm) do { } while (0) 80 81 /* 82 * After we have set current->mm to a new value, this activates 83 * the context for the new mm so we see the new mappings. 84 */ 85 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 86 { 87 unsigned long flags; 88 89 local_irq_save(flags); 90 switch_mm(prev, next, current); 91 local_irq_restore(flags); 92 } 93 94 /* We don't currently use enter_lazy_tlb() for anything */ 95 static inline void enter_lazy_tlb(struct mm_struct *mm, 96 struct task_struct *tsk) 97 { 98 /* 64-bit Book3E keeps track of current PGD in the PACA */ 99 #ifdef CONFIG_PPC_BOOK3E_64 100 get_paca()->pgd = NULL; 101 #endif 102 } 103 104 #endif /* __KERNEL__ */ 105 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 106