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-generic/mm_hooks.h>
12 #include <asm/cputhreads.h>
15 * Most if the context management is out of line
17 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
18 extern void destroy_context(struct mm_struct *mm);
19 #ifdef CONFIG_SPAPR_TCE_IOMMU
20 struct mm_iommu_table_group_mem_t;
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);
38 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
39 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
40 extern void set_context(unsigned long id, pgd_t *pgd);
42 #ifdef CONFIG_PPC_BOOK3S_64
43 extern int __init_new_context(void);
44 extern void __destroy_context(int context_id);
45 static inline void mmu_context_init(void) { }
47 extern unsigned long __init_new_context(void);
48 extern void __destroy_context(unsigned long context_id);
49 extern void mmu_context_init(void);
52 extern void switch_cop(struct mm_struct *next);
53 extern int use_cop(unsigned long acop, struct mm_struct *mm);
54 extern void drop_cop(unsigned long acop, struct mm_struct *mm);
57 * switch_mm is the entry point called from the architecture independent
58 * code in kernel/sched/core.c
60 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
61 struct task_struct *tsk)
63 /* Mark this context has been used on the new CPU */
64 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
66 /* 32-bit keeps track of the current PGDIR in the thread struct */
68 tsk->thread.pgdir = next->pgd;
69 #endif /* CONFIG_PPC32 */
71 /* 64-bit Book3E keeps track of current PGD in the PACA */
72 #ifdef CONFIG_PPC_BOOK3E_64
73 get_paca()->pgd = next->pgd;
75 /* Nothing else to do if we aren't actually switching */
79 #ifdef CONFIG_PPC_ICSWX
80 /* Switch coprocessor context only if prev or next uses a coprocessor */
81 if (prev->context.acop || next->context.acop)
83 #endif /* CONFIG_PPC_ICSWX */
85 /* We must stop all altivec streams before changing the HW
89 if (cpu_has_feature(CPU_FTR_ALTIVEC))
90 asm volatile ("dssall");
91 #endif /* CONFIG_ALTIVEC */
93 /* The actual HW switching method differs between the various
96 #ifdef CONFIG_PPC_STD_MMU_64
97 switch_slb(tsk, next);
99 /* Out of line for now */
100 switch_mmu_context(prev, next);
105 #define deactivate_mm(tsk,mm) do { } while (0)
108 * After we have set current->mm to a new value, this activates
109 * the context for the new mm so we see the new mappings.
111 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
115 local_irq_save(flags);
116 switch_mm(prev, next, current);
117 local_irq_restore(flags);
120 /* We don't currently use enter_lazy_tlb() for anything */
121 static inline void enter_lazy_tlb(struct mm_struct *mm,
122 struct task_struct *tsk)
124 /* 64-bit Book3E keeps track of current PGD in the PACA */
125 #ifdef CONFIG_PPC_BOOK3E_64
126 get_paca()->pgd = NULL;
130 #endif /* __KERNEL__ */
131 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */