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 int isolate_lru_page(struct page *page); /* from internal.h */ 22 extern bool mm_iommu_preregistered(void); 23 extern long mm_iommu_get(unsigned long ua, unsigned long entries, 24 struct mm_iommu_table_group_mem_t **pmem); 25 extern long mm_iommu_put(struct mm_iommu_table_group_mem_t *mem); 26 extern void mm_iommu_init(mm_context_t *ctx); 27 extern void mm_iommu_cleanup(mm_context_t *ctx); 28 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(unsigned long ua, 29 unsigned long size); 30 extern struct mm_iommu_table_group_mem_t *mm_iommu_find(unsigned long ua, 31 unsigned long entries); 32 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 33 unsigned long ua, unsigned long *hpa); 34 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 35 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 36 #endif 37 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 38 extern void set_context(unsigned long id, pgd_t *pgd); 39 40 #ifdef CONFIG_PPC_BOOK3S_64 41 extern void radix__switch_mmu_context(struct mm_struct *prev, 42 struct mm_struct *next); 43 static inline void switch_mmu_context(struct mm_struct *prev, 44 struct mm_struct *next, 45 struct task_struct *tsk) 46 { 47 if (radix_enabled()) 48 return radix__switch_mmu_context(prev, next); 49 return switch_slb(tsk, next); 50 } 51 52 extern int __init_new_context(void); 53 extern void __destroy_context(int context_id); 54 static inline void mmu_context_init(void) { } 55 #else 56 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, 57 struct task_struct *tsk); 58 extern unsigned long __init_new_context(void); 59 extern void __destroy_context(unsigned long context_id); 60 extern void mmu_context_init(void); 61 #endif 62 63 extern void switch_cop(struct mm_struct *next); 64 extern int use_cop(unsigned long acop, struct mm_struct *mm); 65 extern void drop_cop(unsigned long acop, struct mm_struct *mm); 66 67 /* 68 * switch_mm is the entry point called from the architecture independent 69 * code in kernel/sched/core.c 70 */ 71 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 72 struct task_struct *tsk) 73 { 74 /* Mark this context has been used on the new CPU */ 75 if (!cpumask_test_cpu(smp_processor_id(), mm_cpumask(next))) 76 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); 77 78 /* 32-bit keeps track of the current PGDIR in the thread struct */ 79 #ifdef CONFIG_PPC32 80 tsk->thread.pgdir = next->pgd; 81 #endif /* CONFIG_PPC32 */ 82 83 /* 64-bit Book3E keeps track of current PGD in the PACA */ 84 #ifdef CONFIG_PPC_BOOK3E_64 85 get_paca()->pgd = next->pgd; 86 #endif 87 /* Nothing else to do if we aren't actually switching */ 88 if (prev == next) 89 return; 90 91 #ifdef CONFIG_PPC_ICSWX 92 /* Switch coprocessor context only if prev or next uses a coprocessor */ 93 if (prev->context.acop || next->context.acop) 94 switch_cop(next); 95 #endif /* CONFIG_PPC_ICSWX */ 96 97 /* We must stop all altivec streams before changing the HW 98 * context 99 */ 100 #ifdef CONFIG_ALTIVEC 101 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 102 asm volatile ("dssall"); 103 #endif /* CONFIG_ALTIVEC */ 104 /* 105 * The actual HW switching method differs between the various 106 * sub architectures. Out of line for now 107 */ 108 switch_mmu_context(prev, next, tsk); 109 } 110 111 #define deactivate_mm(tsk,mm) do { } while (0) 112 113 /* 114 * After we have set current->mm to a new value, this activates 115 * the context for the new mm so we see the new mappings. 116 */ 117 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 118 { 119 unsigned long flags; 120 121 local_irq_save(flags); 122 switch_mm(prev, next, current); 123 local_irq_restore(flags); 124 } 125 126 /* We don't currently use enter_lazy_tlb() for anything */ 127 static inline void enter_lazy_tlb(struct mm_struct *mm, 128 struct task_struct *tsk) 129 { 130 /* 64-bit Book3E keeps track of current PGD in the PACA */ 131 #ifdef CONFIG_PPC_BOOK3E_64 132 get_paca()->pgd = NULL; 133 #endif 134 } 135 136 static inline void arch_dup_mmap(struct mm_struct *oldmm, 137 struct mm_struct *mm) 138 { 139 } 140 141 static inline void arch_exit_mmap(struct mm_struct *mm) 142 { 143 } 144 145 static inline void arch_unmap(struct mm_struct *mm, 146 struct vm_area_struct *vma, 147 unsigned long start, unsigned long end) 148 { 149 if (start <= mm->context.vdso_base && mm->context.vdso_base < end) 150 mm->context.vdso_base = 0; 151 } 152 153 static inline void arch_bprm_mm_init(struct mm_struct *mm, 154 struct vm_area_struct *vma) 155 { 156 } 157 158 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 159 bool write, bool execute, bool foreign) 160 { 161 /* by default, allow everything */ 162 return true; 163 } 164 165 static inline bool arch_pte_access_permitted(pte_t pte, bool write) 166 { 167 /* by default, allow everything */ 168 return true; 169 } 170 #endif /* __KERNEL__ */ 171 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 172