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(struct mm_struct *mm); 23 extern long mm_iommu_get(struct mm_struct *mm, 24 unsigned long ua, unsigned long entries, 25 struct mm_iommu_table_group_mem_t **pmem); 26 extern long mm_iommu_put(struct mm_struct *mm, 27 struct mm_iommu_table_group_mem_t *mem); 28 extern void mm_iommu_init(struct mm_struct *mm); 29 extern void mm_iommu_cleanup(struct mm_struct *mm); 30 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, 31 unsigned long ua, unsigned long size); 32 extern struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm, 33 unsigned long ua, unsigned long entries); 34 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 35 unsigned long ua, unsigned long *hpa); 36 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 37 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 38 #endif 39 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 40 extern void set_context(unsigned long id, pgd_t *pgd); 41 42 #ifdef CONFIG_PPC_BOOK3S_64 43 extern void radix__switch_mmu_context(struct mm_struct *prev, 44 struct mm_struct *next); 45 static inline void switch_mmu_context(struct mm_struct *prev, 46 struct mm_struct *next, 47 struct task_struct *tsk) 48 { 49 if (radix_enabled()) 50 return radix__switch_mmu_context(prev, next); 51 return switch_slb(tsk, next); 52 } 53 54 extern int __init_new_context(void); 55 extern void __destroy_context(int context_id); 56 static inline void mmu_context_init(void) { } 57 #else 58 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, 59 struct task_struct *tsk); 60 extern unsigned long __init_new_context(void); 61 extern void __destroy_context(unsigned long context_id); 62 extern void mmu_context_init(void); 63 #endif 64 65 extern void switch_cop(struct mm_struct *next); 66 extern int use_cop(unsigned long acop, struct mm_struct *mm); 67 extern void drop_cop(unsigned long acop, struct mm_struct *mm); 68 69 /* 70 * switch_mm is the entry point called from the architecture independent 71 * code in kernel/sched/core.c 72 */ 73 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 74 struct task_struct *tsk) 75 { 76 /* Mark this context has been used on the new CPU */ 77 if (!cpumask_test_cpu(smp_processor_id(), mm_cpumask(next))) 78 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); 79 80 /* 32-bit keeps track of the current PGDIR in the thread struct */ 81 #ifdef CONFIG_PPC32 82 tsk->thread.pgdir = next->pgd; 83 #endif /* CONFIG_PPC32 */ 84 85 /* 64-bit Book3E keeps track of current PGD in the PACA */ 86 #ifdef CONFIG_PPC_BOOK3E_64 87 get_paca()->pgd = next->pgd; 88 #endif 89 /* Nothing else to do if we aren't actually switching */ 90 if (prev == next) 91 return; 92 93 #ifdef CONFIG_PPC_ICSWX 94 /* Switch coprocessor context only if prev or next uses a coprocessor */ 95 if (prev->context.acop || next->context.acop) 96 switch_cop(next); 97 #endif /* CONFIG_PPC_ICSWX */ 98 99 /* We must stop all altivec streams before changing the HW 100 * context 101 */ 102 #ifdef CONFIG_ALTIVEC 103 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 104 asm volatile ("dssall"); 105 #endif /* CONFIG_ALTIVEC */ 106 /* 107 * The actual HW switching method differs between the various 108 * sub architectures. Out of line for now 109 */ 110 switch_mmu_context(prev, next, tsk); 111 } 112 113 #define deactivate_mm(tsk,mm) do { } while (0) 114 115 /* 116 * After we have set current->mm to a new value, this activates 117 * the context for the new mm so we see the new mappings. 118 */ 119 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 120 { 121 unsigned long flags; 122 123 local_irq_save(flags); 124 switch_mm(prev, next, current); 125 local_irq_restore(flags); 126 } 127 128 /* We don't currently use enter_lazy_tlb() for anything */ 129 static inline void enter_lazy_tlb(struct mm_struct *mm, 130 struct task_struct *tsk) 131 { 132 /* 64-bit Book3E keeps track of current PGD in the PACA */ 133 #ifdef CONFIG_PPC_BOOK3E_64 134 get_paca()->pgd = NULL; 135 #endif 136 } 137 138 static inline void arch_dup_mmap(struct mm_struct *oldmm, 139 struct mm_struct *mm) 140 { 141 } 142 143 static inline void arch_exit_mmap(struct mm_struct *mm) 144 { 145 } 146 147 static inline void arch_unmap(struct mm_struct *mm, 148 struct vm_area_struct *vma, 149 unsigned long start, unsigned long end) 150 { 151 if (start <= mm->context.vdso_base && mm->context.vdso_base < end) 152 mm->context.vdso_base = 0; 153 } 154 155 static inline void arch_bprm_mm_init(struct mm_struct *mm, 156 struct vm_area_struct *vma) 157 { 158 } 159 160 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 161 bool write, bool execute, bool foreign) 162 { 163 /* by default, allow everything */ 164 return true; 165 } 166 167 static inline bool arch_pte_access_permitted(pte_t pte, bool write) 168 { 169 /* by default, allow everything */ 170 return true; 171 } 172 #endif /* __KERNEL__ */ 173 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 174