1 #ifndef __ASM_POWERPC_MMU_CONTEXT_H
2 #define __ASM_POWERPC_MMU_CONTEXT_H
5 #include <linux/kernel.h>
7 #include <linux/sched.h>
8 #include <linux/spinlock.h>
10 #include <asm/cputable.h>
11 #include <asm/cputhreads.h>
14 * Most if the context management is out of line
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;
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,
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);
37 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
38 extern void set_context(unsigned long id, pgd_t *pgd);
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)
48 return radix__switch_mmu_context(prev, next);
49 return switch_slb(tsk, next);
52 extern int __init_new_context(void);
53 extern void __destroy_context(int context_id);
54 static inline void mmu_context_init(void) { }
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);
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);
68 * switch_mm is the entry point called from the architecture independent
69 * code in kernel/sched/core.c
71 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
72 struct task_struct *tsk)
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));
78 /* 32-bit keeps track of the current PGDIR in the thread struct */
80 tsk->thread.pgdir = next->pgd;
81 #endif /* CONFIG_PPC32 */
83 /* 64-bit Book3E keeps track of current PGD in the PACA */
84 #ifdef CONFIG_PPC_BOOK3E_64
85 get_paca()->pgd = next->pgd;
87 /* Nothing else to do if we aren't actually switching */
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)
95 #endif /* CONFIG_PPC_ICSWX */
97 /* We must stop all altivec streams before changing the HW
100 #ifdef CONFIG_ALTIVEC
101 if (cpu_has_feature(CPU_FTR_ALTIVEC))
102 asm volatile ("dssall");
103 #endif /* CONFIG_ALTIVEC */
105 * The actual HW switching method differs between the various
106 * sub architectures. Out of line for now
108 switch_mmu_context(prev, next, tsk);
111 #define deactivate_mm(tsk,mm) do { } while (0)
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.
117 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
121 local_irq_save(flags);
122 switch_mm(prev, next, current);
123 local_irq_restore(flags);
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)
130 /* 64-bit Book3E keeps track of current PGD in the PACA */
131 #ifdef CONFIG_PPC_BOOK3E_64
132 get_paca()->pgd = NULL;
136 static inline void arch_dup_mmap(struct mm_struct *oldmm,
137 struct mm_struct *mm)
141 static inline void arch_exit_mmap(struct mm_struct *mm)
145 static inline void arch_unmap(struct mm_struct *mm,
146 struct vm_area_struct *vma,
147 unsigned long start, unsigned long end)
149 if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
150 mm->context.vdso_base = 0;
153 static inline void arch_bprm_mm_init(struct mm_struct *mm,
154 struct vm_area_struct *vma)
158 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
159 bool write, bool execute, bool foreign)
161 /* by default, allow everything */
165 static inline bool arch_pte_access_permitted(pte_t pte, bool write)
167 /* by default, allow everything */
170 #endif /* __KERNEL__ */
171 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */