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/cputhreads.h> 12 13 /* 14 * Most if the context management is out of line 15 */ 16 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); 17 extern void destroy_context(struct mm_struct *mm); 18 #ifdef CONFIG_SPAPR_TCE_IOMMU 19 struct mm_iommu_table_group_mem_t; 20 21 extern bool mm_iommu_preregistered(void); 22 extern long mm_iommu_get(unsigned long ua, unsigned long entries, 23 struct mm_iommu_table_group_mem_t **pmem); 24 extern long mm_iommu_put(struct mm_iommu_table_group_mem_t *mem); 25 extern void mm_iommu_init(mm_context_t *ctx); 26 extern void mm_iommu_cleanup(mm_context_t *ctx); 27 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(unsigned long ua, 28 unsigned long size); 29 extern struct mm_iommu_table_group_mem_t *mm_iommu_find(unsigned long ua, 30 unsigned long entries); 31 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 32 unsigned long ua, unsigned long *hpa); 33 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 34 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 35 #endif 36 37 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next); 38 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 39 extern void set_context(unsigned long id, pgd_t *pgd); 40 41 #ifdef CONFIG_PPC_BOOK3S_64 42 extern int __init_new_context(void); 43 extern void __destroy_context(int context_id); 44 static inline void mmu_context_init(void) { } 45 #else 46 extern unsigned long __init_new_context(void); 47 extern void __destroy_context(unsigned long context_id); 48 extern void mmu_context_init(void); 49 #endif 50 51 extern void switch_cop(struct mm_struct *next); 52 extern int use_cop(unsigned long acop, struct mm_struct *mm); 53 extern void drop_cop(unsigned long acop, struct mm_struct *mm); 54 55 /* 56 * switch_mm is the entry point called from the architecture independent 57 * code in kernel/sched/core.c 58 */ 59 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 60 struct task_struct *tsk) 61 { 62 /* Mark this context has been used on the new CPU */ 63 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); 64 65 /* 32-bit keeps track of the current PGDIR in the thread struct */ 66 #ifdef CONFIG_PPC32 67 tsk->thread.pgdir = next->pgd; 68 #endif /* CONFIG_PPC32 */ 69 70 /* 64-bit Book3E keeps track of current PGD in the PACA */ 71 #ifdef CONFIG_PPC_BOOK3E_64 72 get_paca()->pgd = next->pgd; 73 #endif 74 /* Nothing else to do if we aren't actually switching */ 75 if (prev == next) 76 return; 77 78 #ifdef CONFIG_PPC_ICSWX 79 /* Switch coprocessor context only if prev or next uses a coprocessor */ 80 if (prev->context.acop || next->context.acop) 81 switch_cop(next); 82 #endif /* CONFIG_PPC_ICSWX */ 83 84 /* We must stop all altivec streams before changing the HW 85 * context 86 */ 87 #ifdef CONFIG_ALTIVEC 88 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 89 asm volatile ("dssall"); 90 #endif /* CONFIG_ALTIVEC */ 91 92 /* The actual HW switching method differs between the various 93 * sub architectures. 94 */ 95 #ifdef CONFIG_PPC_STD_MMU_64 96 switch_slb(tsk, next); 97 #else 98 /* Out of line for now */ 99 switch_mmu_context(prev, next); 100 #endif 101 102 } 103 104 #define deactivate_mm(tsk,mm) do { } while (0) 105 106 /* 107 * After we have set current->mm to a new value, this activates 108 * the context for the new mm so we see the new mappings. 109 */ 110 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 111 { 112 unsigned long flags; 113 114 local_irq_save(flags); 115 switch_mm(prev, next, current); 116 local_irq_restore(flags); 117 } 118 119 /* We don't currently use enter_lazy_tlb() for anything */ 120 static inline void enter_lazy_tlb(struct mm_struct *mm, 121 struct task_struct *tsk) 122 { 123 /* 64-bit Book3E keeps track of current PGD in the PACA */ 124 #ifdef CONFIG_PPC_BOOK3E_64 125 get_paca()->pgd = NULL; 126 #endif 127 } 128 129 static inline void arch_dup_mmap(struct mm_struct *oldmm, 130 struct mm_struct *mm) 131 { 132 } 133 134 static inline void arch_exit_mmap(struct mm_struct *mm) 135 { 136 } 137 138 static inline void arch_unmap(struct mm_struct *mm, 139 struct vm_area_struct *vma, 140 unsigned long start, unsigned long end) 141 { 142 if (start <= mm->context.vdso_base && mm->context.vdso_base < end) 143 mm->context.vdso_base = 0; 144 } 145 146 static inline void arch_bprm_mm_init(struct mm_struct *mm, 147 struct vm_area_struct *vma) 148 { 149 } 150 151 #endif /* __KERNEL__ */ 152 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 153