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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 | ||
2e5bbb54 | 21 | extern int isolate_lru_page(struct page *page); /* from internal.h */ |
15b244a8 AK |
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 | |
1da177e4 | 37 | extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); |
5e696617 | 38 | extern void set_context(unsigned long id, pgd_t *pgd); |
1da177e4 | 39 | |
6f0ef0f5 | 40 | #ifdef CONFIG_PPC_BOOK3S_64 |
7e381c0f AK |
41 | extern void radix__switch_mmu_context(struct mm_struct *prev, |
42 | struct mm_struct *next); | |
d2adba3f AK |
43 | static inline void switch_mmu_context(struct mm_struct *prev, |
44 | struct mm_struct *next, | |
45 | struct task_struct *tsk) | |
46 | { | |
7e381c0f AK |
47 | if (radix_enabled()) |
48 | return radix__switch_mmu_context(prev, next); | |
d2adba3f AK |
49 | return switch_slb(tsk, next); |
50 | } | |
51 | ||
e85a4710 AG |
52 | extern int __init_new_context(void); |
53 | extern void __destroy_context(int context_id); | |
6f0ef0f5 BH |
54 | static inline void mmu_context_init(void) { } |
55 | #else | |
d2adba3f AK |
56 | extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, |
57 | struct task_struct *tsk); | |
c83ec269 AG |
58 | extern unsigned long __init_new_context(void); |
59 | extern void __destroy_context(unsigned long context_id); | |
6f0ef0f5 BH |
60 | extern void mmu_context_init(void); |
61 | #endif | |
62 | ||
851d2e2f THFL |
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 | ||
1da177e4 LT |
67 | /* |
68 | * switch_mm is the entry point called from the architecture independent | |
0a0fca9d | 69 | * code in kernel/sched/core.c |
1da177e4 LT |
70 | */ |
71 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
72 | struct task_struct *tsk) | |
73 | { | |
5e696617 | 74 | /* Mark this context has been used on the new CPU */ |
bb85fb58 AB |
75 | if (!cpumask_test_cpu(smp_processor_id(), mm_cpumask(next))) |
76 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); | |
5e696617 BH |
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 */ | |
1da177e4 | 82 | |
25d21ad6 BH |
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 | |
5e696617 | 87 | /* Nothing else to do if we aren't actually switching */ |
1da177e4 LT |
88 | if (prev == next) |
89 | return; | |
90 | ||
851d2e2f THFL |
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 | ||
5e696617 BH |
97 | /* We must stop all altivec streams before changing the HW |
98 | * context | |
99 | */ | |
1da177e4 LT |
100 | #ifdef CONFIG_ALTIVEC |
101 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
102 | asm volatile ("dssall"); | |
103 | #endif /* CONFIG_ALTIVEC */ | |
d2adba3f AK |
104 | /* |
105 | * The actual HW switching method differs between the various | |
106 | * sub architectures. Out of line for now | |
5e696617 | 107 | */ |
d2adba3f | 108 | switch_mmu_context(prev, next, tsk); |
1da177e4 LT |
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 | ||
5e696617 BH |
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 | { | |
25d21ad6 BH |
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 | |
5e696617 BH |
134 | } |
135 | ||
83d3f0e9 LD |
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 | ||
1b2ee126 | 158 | static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, |
d61172b4 | 159 | bool write, bool execute, bool foreign) |
33a709b2 DH |
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 | } | |
88ced031 | 170 | #endif /* __KERNEL__ */ |
047ea784 | 171 | #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |