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);
36 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
37 extern void set_context(unsigned long id, pgd_t *pgd);
39 #ifdef CONFIG_PPC_BOOK3S_64
40 extern void radix__switch_mmu_context(struct mm_struct *prev,
41 struct mm_struct *next);
42 static inline void switch_mmu_context(struct mm_struct *prev,
43 struct mm_struct *next,
44 struct task_struct *tsk)
47 return radix__switch_mmu_context(prev, next);
48 return switch_slb(tsk, next);
51 extern int __init_new_context(void);
52 extern void __destroy_context(int context_id);
53 static inline void mmu_context_init(void) { }
55 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
56 struct task_struct *tsk);
57 extern unsigned long __init_new_context(void);
58 extern void __destroy_context(unsigned long context_id);
59 extern void mmu_context_init(void);
62 extern void switch_cop(struct mm_struct *next);
63 extern int use_cop(unsigned long acop, struct mm_struct *mm);
64 extern void drop_cop(unsigned long acop, struct mm_struct *mm);
67 * switch_mm is the entry point called from the architecture independent
68 * code in kernel/sched/core.c
70 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
71 struct task_struct *tsk)
73 /* Mark this context has been used on the new CPU */
74 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
76 /* 32-bit keeps track of the current PGDIR in the thread struct */
78 tsk->thread.pgdir = next->pgd;
79 #endif /* CONFIG_PPC32 */
81 /* 64-bit Book3E keeps track of current PGD in the PACA */
82 #ifdef CONFIG_PPC_BOOK3E_64
83 get_paca()->pgd = next->pgd;
85 /* Nothing else to do if we aren't actually switching */
89 #ifdef CONFIG_PPC_ICSWX
90 /* Switch coprocessor context only if prev or next uses a coprocessor */
91 if (prev->context.acop || next->context.acop)
93 #endif /* CONFIG_PPC_ICSWX */
95 /* We must stop all altivec streams before changing the HW
99 if (cpu_has_feature(CPU_FTR_ALTIVEC))
100 asm volatile ("dssall");
101 #endif /* CONFIG_ALTIVEC */
103 * The actual HW switching method differs between the various
104 * sub architectures. Out of line for now
106 switch_mmu_context(prev, next, tsk);
109 #define deactivate_mm(tsk,mm) do { } while (0)
112 * After we have set current->mm to a new value, this activates
113 * the context for the new mm so we see the new mappings.
115 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
119 local_irq_save(flags);
120 switch_mm(prev, next, current);
121 local_irq_restore(flags);
124 /* We don't currently use enter_lazy_tlb() for anything */
125 static inline void enter_lazy_tlb(struct mm_struct *mm,
126 struct task_struct *tsk)
128 /* 64-bit Book3E keeps track of current PGD in the PACA */
129 #ifdef CONFIG_PPC_BOOK3E_64
130 get_paca()->pgd = NULL;
134 static inline void arch_dup_mmap(struct mm_struct *oldmm,
135 struct mm_struct *mm)
139 static inline void arch_exit_mmap(struct mm_struct *mm)
143 static inline void arch_unmap(struct mm_struct *mm,
144 struct vm_area_struct *vma,
145 unsigned long start, unsigned long end)
147 if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
148 mm->context.vdso_base = 0;
151 static inline void arch_bprm_mm_init(struct mm_struct *mm,
152 struct vm_area_struct *vma)
156 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
157 bool write, bool execute, bool foreign)
159 /* by default, allow everything */
163 static inline bool arch_pte_access_permitted(pte_t pte, bool write)
165 /* by default, allow everything */
168 #endif /* __KERNEL__ */
169 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */