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(struct mm_struct *mm);
23 extern long mm_iommu_get(struct mm_struct *mm,
24 unsigned long ua, unsigned long entries,
25 struct mm_iommu_table_group_mem_t **pmem);
26 extern long mm_iommu_put(struct mm_struct *mm,
27 struct mm_iommu_table_group_mem_t *mem);
28 extern void mm_iommu_init(struct mm_struct *mm);
29 extern void mm_iommu_cleanup(struct mm_struct *mm);
30 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
31 unsigned long ua, unsigned long size);
32 extern struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm,
33 unsigned long ua, unsigned long entries);
34 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
35 unsigned long ua, unsigned long *hpa);
36 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
37 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
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 void radix__switch_mmu_context(struct mm_struct *prev,
44 struct mm_struct *next);
45 static inline void switch_mmu_context(struct mm_struct *prev,
46 struct mm_struct *next,
47 struct task_struct *tsk)
50 return radix__switch_mmu_context(prev, next);
51 return switch_slb(tsk, next);
54 extern int __init_new_context(void);
55 extern void __destroy_context(int context_id);
56 static inline void mmu_context_init(void) { }
58 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
59 struct task_struct *tsk);
60 extern unsigned long __init_new_context(void);
61 extern void __destroy_context(unsigned long context_id);
62 extern void mmu_context_init(void);
65 extern void switch_cop(struct mm_struct *next);
66 extern int use_cop(unsigned long acop, struct mm_struct *mm);
67 extern void drop_cop(unsigned long acop, struct mm_struct *mm);
70 * switch_mm is the entry point called from the architecture independent
71 * code in kernel/sched/core.c
73 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
74 struct task_struct *tsk)
76 /* Mark this context has been used on the new CPU */
77 if (!cpumask_test_cpu(smp_processor_id(), mm_cpumask(next)))
78 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
80 /* 32-bit keeps track of the current PGDIR in the thread struct */
82 tsk->thread.pgdir = next->pgd;
83 #endif /* CONFIG_PPC32 */
85 /* 64-bit Book3E keeps track of current PGD in the PACA */
86 #ifdef CONFIG_PPC_BOOK3E_64
87 get_paca()->pgd = next->pgd;
89 /* Nothing else to do if we aren't actually switching */
93 #ifdef CONFIG_PPC_ICSWX
94 /* Switch coprocessor context only if prev or next uses a coprocessor */
95 if (prev->context.acop || next->context.acop)
97 #endif /* CONFIG_PPC_ICSWX */
99 /* We must stop all altivec streams before changing the HW
102 #ifdef CONFIG_ALTIVEC
103 if (cpu_has_feature(CPU_FTR_ALTIVEC))
104 asm volatile ("dssall");
105 #endif /* CONFIG_ALTIVEC */
107 * The actual HW switching method differs between the various
108 * sub architectures. Out of line for now
110 switch_mmu_context(prev, next, tsk);
113 #define deactivate_mm(tsk,mm) do { } while (0)
116 * After we have set current->mm to a new value, this activates
117 * the context for the new mm so we see the new mappings.
119 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
123 local_irq_save(flags);
124 switch_mm(prev, next, current);
125 local_irq_restore(flags);
128 /* We don't currently use enter_lazy_tlb() for anything */
129 static inline void enter_lazy_tlb(struct mm_struct *mm,
130 struct task_struct *tsk)
132 /* 64-bit Book3E keeps track of current PGD in the PACA */
133 #ifdef CONFIG_PPC_BOOK3E_64
134 get_paca()->pgd = NULL;
138 static inline void arch_dup_mmap(struct mm_struct *oldmm,
139 struct mm_struct *mm)
143 static inline void arch_exit_mmap(struct mm_struct *mm)
147 static inline void arch_unmap(struct mm_struct *mm,
148 struct vm_area_struct *vma,
149 unsigned long start, unsigned long end)
151 if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
152 mm->context.vdso_base = 0;
155 static inline void arch_bprm_mm_init(struct mm_struct *mm,
156 struct vm_area_struct *vma)
160 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
161 bool write, bool execute, bool foreign)
163 /* by default, allow everything */
167 static inline bool arch_pte_access_permitted(pte_t pte, bool write)
169 /* by default, allow everything */
172 #endif /* __KERNEL__ */
173 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */