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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> | |
5e696617 | 11 | #include <asm/cputhreads.h> |
80a7cc6c KG |
12 | |
13 | /* | |
5e696617 | 14 | * Most if the context management is out of line |
80a7cc6c | 15 | */ |
1da177e4 LT |
16 | extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); |
17 | extern void destroy_context(struct mm_struct *mm); | |
15b244a8 AK |
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 | |
1da177e4 | 36 | |
5e696617 | 37 | extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next); |
1da177e4 | 38 | extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); |
5e696617 | 39 | extern void set_context(unsigned long id, pgd_t *pgd); |
1da177e4 | 40 | |
6f0ef0f5 | 41 | #ifdef CONFIG_PPC_BOOK3S_64 |
e85a4710 AG |
42 | extern int __init_new_context(void); |
43 | extern void __destroy_context(int context_id); | |
6f0ef0f5 BH |
44 | static inline void mmu_context_init(void) { } |
45 | #else | |
c83ec269 AG |
46 | extern unsigned long __init_new_context(void); |
47 | extern void __destroy_context(unsigned long context_id); | |
6f0ef0f5 BH |
48 | extern void mmu_context_init(void); |
49 | #endif | |
50 | ||
851d2e2f THFL |
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 | ||
1da177e4 LT |
55 | /* |
56 | * switch_mm is the entry point called from the architecture independent | |
0a0fca9d | 57 | * code in kernel/sched/core.c |
1da177e4 LT |
58 | */ |
59 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
60 | struct task_struct *tsk) | |
61 | { | |
5e696617 | 62 | /* Mark this context has been used on the new CPU */ |
56aa4129 | 63 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); |
5e696617 BH |
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 */ | |
1da177e4 | 69 | |
25d21ad6 BH |
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 | |
5e696617 | 74 | /* Nothing else to do if we aren't actually switching */ |
1da177e4 LT |
75 | if (prev == next) |
76 | return; | |
77 | ||
851d2e2f THFL |
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 | ||
5e696617 BH |
84 | /* We must stop all altivec streams before changing the HW |
85 | * context | |
86 | */ | |
1da177e4 LT |
87 | #ifdef CONFIG_ALTIVEC |
88 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
89 | asm volatile ("dssall"); | |
90 | #endif /* CONFIG_ALTIVEC */ | |
91 | ||
5e696617 BH |
92 | /* The actual HW switching method differs between the various |
93 | * sub architectures. | |
94 | */ | |
95 | #ifdef CONFIG_PPC_STD_MMU_64 | |
13b3d13b | 96 | switch_slb(tsk, next); |
5e696617 BH |
97 | #else |
98 | /* Out of line for now */ | |
99 | switch_mmu_context(prev, next); | |
100 | #endif | |
101 | ||
1da177e4 LT |
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 | ||
5e696617 BH |
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 | { | |
25d21ad6 BH |
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 | |
5e696617 BH |
127 | } |
128 | ||
83d3f0e9 LD |
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 | ||
1b2ee126 | 151 | static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, |
d61172b4 | 152 | bool write, bool execute, bool foreign) |
33a709b2 DH |
153 | { |
154 | /* by default, allow everything */ | |
155 | return true; | |
156 | } | |
157 | ||
158 | static inline bool arch_pte_access_permitted(pte_t pte, bool write) | |
159 | { | |
160 | /* by default, allow everything */ | |
161 | return true; | |
162 | } | |
88ced031 | 163 | #endif /* __KERNEL__ */ |
047ea784 | 164 | #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |