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 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
,
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
);
37 extern void switch_mmu_context(struct mm_struct
*prev
, struct mm_struct
*next
);
38 extern void switch_slb(struct task_struct
*tsk
, struct mm_struct
*mm
);
39 extern void set_context(unsigned long id
, pgd_t
*pgd
);
41 #ifdef CONFIG_PPC_BOOK3S_64
42 extern int __init_new_context(void);
43 extern void __destroy_context(int context_id
);
44 static inline void mmu_context_init(void) { }
46 extern unsigned long __init_new_context(void);
47 extern void __destroy_context(unsigned long context_id
);
48 extern void mmu_context_init(void);
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
);
56 * switch_mm is the entry point called from the architecture independent
57 * code in kernel/sched/core.c
59 static inline void switch_mm(struct mm_struct
*prev
, struct mm_struct
*next
,
60 struct task_struct
*tsk
)
62 /* Mark this context has been used on the new CPU */
63 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next
));
65 /* 32-bit keeps track of the current PGDIR in the thread struct */
67 tsk
->thread
.pgdir
= next
->pgd
;
68 #endif /* CONFIG_PPC32 */
70 /* 64-bit Book3E keeps track of current PGD in the PACA */
71 #ifdef CONFIG_PPC_BOOK3E_64
72 get_paca()->pgd
= next
->pgd
;
74 /* Nothing else to do if we aren't actually switching */
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
)
82 #endif /* CONFIG_PPC_ICSWX */
84 /* We must stop all altivec streams before changing the HW
88 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
89 asm volatile ("dssall");
90 #endif /* CONFIG_ALTIVEC */
92 /* The actual HW switching method differs between the various
95 #ifdef CONFIG_PPC_STD_MMU_64
96 switch_slb(tsk
, next
);
98 /* Out of line for now */
99 switch_mmu_context(prev
, next
);
104 #define deactivate_mm(tsk,mm) do { } while (0)
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.
110 static inline void activate_mm(struct mm_struct
*prev
, struct mm_struct
*next
)
114 local_irq_save(flags
);
115 switch_mm(prev
, next
, current
);
116 local_irq_restore(flags
);
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
)
123 /* 64-bit Book3E keeps track of current PGD in the PACA */
124 #ifdef CONFIG_PPC_BOOK3E_64
125 get_paca()->pgd
= NULL
;
129 static inline void arch_dup_mmap(struct mm_struct
*oldmm
,
130 struct mm_struct
*mm
)
134 static inline void arch_exit_mmap(struct mm_struct
*mm
)
138 static inline void arch_unmap(struct mm_struct
*mm
,
139 struct vm_area_struct
*vma
,
140 unsigned long start
, unsigned long end
)
142 if (start
<= mm
->context
.vdso_base
&& mm
->context
.vdso_base
< end
)
143 mm
->context
.vdso_base
= 0;
146 static inline void arch_bprm_mm_init(struct mm_struct
*mm
,
147 struct vm_area_struct
*vma
)
151 #endif /* __KERNEL__ */
152 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */