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1#ifndef __ASM_POWERPC_MMU_CONTEXT_H
2#define __ASM_POWERPC_MMU_CONTEXT_H
3#ifdef __KERNEL__
4
5#include <linux/kernel.h>
6#include <linux/mm.h>
7#include <linux/sched.h>
8#include <linux/spinlock.h>
9#include <asm/mmu.h>
10#include <asm/cputable.h>
11#include <asm/cputhreads.h>
12
13/*
14 * Most if the context management is out of line
15 */
16extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
17extern void destroy_context(struct mm_struct *mm);
18#ifdef CONFIG_SPAPR_TCE_IOMMU
19struct mm_iommu_table_group_mem_t;
20
21extern bool mm_iommu_preregistered(void);
22extern long mm_iommu_get(unsigned long ua, unsigned long entries,
23 struct mm_iommu_table_group_mem_t **pmem);
24extern long mm_iommu_put(struct mm_iommu_table_group_mem_t *mem);
25extern void mm_iommu_init(mm_context_t *ctx);
26extern void mm_iommu_cleanup(mm_context_t *ctx);
27extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(unsigned long ua,
28 unsigned long size);
29extern struct mm_iommu_table_group_mem_t *mm_iommu_find(unsigned long ua,
30 unsigned long entries);
31extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
32 unsigned long ua, unsigned long *hpa);
33extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
34extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
35#endif
36
37extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
38extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
39extern void set_context(unsigned long id, pgd_t *pgd);
40
41#ifdef CONFIG_PPC_BOOK3S_64
42extern int __init_new_context(void);
43extern void __destroy_context(int context_id);
44static inline void mmu_context_init(void) { }
45#else
46extern unsigned long __init_new_context(void);
47extern void __destroy_context(unsigned long context_id);
48extern void mmu_context_init(void);
49#endif
50
51extern void switch_cop(struct mm_struct *next);
52extern int use_cop(unsigned long acop, struct mm_struct *mm);
53extern void drop_cop(unsigned long acop, struct mm_struct *mm);
54
55/*
56 * switch_mm is the entry point called from the architecture independent
57 * code in kernel/sched/core.c
58 */
59static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
60 struct task_struct *tsk)
61{
62 /* Mark this context has been used on the new CPU */
63 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
64
65 /* 32-bit keeps track of the current PGDIR in the thread struct */
66#ifdef CONFIG_PPC32
67 tsk->thread.pgdir = next->pgd;
68#endif /* CONFIG_PPC32 */
69
70 /* 64-bit Book3E keeps track of current PGD in the PACA */
71#ifdef CONFIG_PPC_BOOK3E_64
72 get_paca()->pgd = next->pgd;
73#endif
74 /* Nothing else to do if we aren't actually switching */
75 if (prev == next)
76 return;
77
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)
81 switch_cop(next);
82#endif /* CONFIG_PPC_ICSWX */
83
84 /* We must stop all altivec streams before changing the HW
85 * context
86 */
87#ifdef CONFIG_ALTIVEC
88 if (cpu_has_feature(CPU_FTR_ALTIVEC))
89 asm volatile ("dssall");
90#endif /* CONFIG_ALTIVEC */
91
92 /* The actual HW switching method differs between the various
93 * sub architectures.
94 */
95#ifdef CONFIG_PPC_STD_MMU_64
96 switch_slb(tsk, next);
97#else
98 /* Out of line for now */
99 switch_mmu_context(prev, next);
100#endif
101
102}
103
104#define deactivate_mm(tsk,mm) do { } while (0)
105
106/*
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.
109 */
110static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
111{
112 unsigned long flags;
113
114 local_irq_save(flags);
115 switch_mm(prev, next, current);
116 local_irq_restore(flags);
117}
118
119/* We don't currently use enter_lazy_tlb() for anything */
120static inline void enter_lazy_tlb(struct mm_struct *mm,
121 struct task_struct *tsk)
122{
123 /* 64-bit Book3E keeps track of current PGD in the PACA */
124#ifdef CONFIG_PPC_BOOK3E_64
125 get_paca()->pgd = NULL;
126#endif
127}
128
129static inline void arch_dup_mmap(struct mm_struct *oldmm,
130 struct mm_struct *mm)
131{
132}
133
134static inline void arch_exit_mmap(struct mm_struct *mm)
135{
136}
137
138static inline void arch_unmap(struct mm_struct *mm,
139 struct vm_area_struct *vma,
140 unsigned long start, unsigned long end)
141{
142 if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
143 mm->context.vdso_base = 0;
144}
145
146static inline void arch_bprm_mm_init(struct mm_struct *mm,
147 struct vm_area_struct *vma)
148{
149}
150
151#endif /* __KERNEL__ */
152#endif /* __ASM_POWERPC_MMU_CONTEXT_H */