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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-generic/mm_hooks.h>
12#include <asm/cputhreads.h>
13
14/*
15 * Most if the context management is out of line
16 */
17extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
18extern void destroy_context(struct mm_struct *mm);
19
20extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
21extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
22extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
23extern void set_context(unsigned long id, pgd_t *pgd);
24
25#ifdef CONFIG_PPC_BOOK3S_64
26extern int __init_new_context(void);
27extern void __destroy_context(int context_id);
28static inline void mmu_context_init(void) { }
29#else
30extern unsigned long __init_new_context(void);
31extern void __destroy_context(unsigned long context_id);
32extern void mmu_context_init(void);
33#endif
34
35extern void switch_cop(struct mm_struct *next);
36extern int use_cop(unsigned long acop, struct mm_struct *mm);
37extern void drop_cop(unsigned long acop, struct mm_struct *mm);
38
39/*
40 * switch_mm is the entry point called from the architecture independent
41 * code in kernel/sched.c
42 */
43static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
44 struct task_struct *tsk)
45{
46 /* Mark this context has been used on the new CPU */
47 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
48
49 /* 32-bit keeps track of the current PGDIR in the thread struct */
50#ifdef CONFIG_PPC32
51 tsk->thread.pgdir = next->pgd;
52#endif /* CONFIG_PPC32 */
53
54 /* 64-bit Book3E keeps track of current PGD in the PACA */
55#ifdef CONFIG_PPC_BOOK3E_64
56 get_paca()->pgd = next->pgd;
57#endif
58 /* Nothing else to do if we aren't actually switching */
59 if (prev == next)
60 return;
61
62#ifdef CONFIG_PPC_ICSWX
63 /* Switch coprocessor context only if prev or next uses a coprocessor */
64 if (prev->context.acop || next->context.acop)
65 switch_cop(next);
66#endif /* CONFIG_PPC_ICSWX */
67
68 /* We must stop all altivec streams before changing the HW
69 * context
70 */
71#ifdef CONFIG_ALTIVEC
72 if (cpu_has_feature(CPU_FTR_ALTIVEC))
73 asm volatile ("dssall");
74#endif /* CONFIG_ALTIVEC */
75
76 /* The actual HW switching method differs between the various
77 * sub architectures.
78 */
79#ifdef CONFIG_PPC_STD_MMU_64
80 if (mmu_has_feature(MMU_FTR_SLB))
81 switch_slb(tsk, next);
82 else
83 switch_stab(tsk, next);
84#else
85 /* Out of line for now */
86 switch_mmu_context(prev, next);
87#endif
88
89}
90
91#define deactivate_mm(tsk,mm) do { } while (0)
92
93/*
94 * After we have set current->mm to a new value, this activates
95 * the context for the new mm so we see the new mappings.
96 */
97static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
98{
99 unsigned long flags;
100
101 local_irq_save(flags);
102 switch_mm(prev, next, current);
103 local_irq_restore(flags);
104}
105
106/* We don't currently use enter_lazy_tlb() for anything */
107static inline void enter_lazy_tlb(struct mm_struct *mm,
108 struct task_struct *tsk)
109{
110 /* 64-bit Book3E keeps track of current PGD in the PACA */
111#ifdef CONFIG_PPC_BOOK3E_64
112 get_paca()->pgd = NULL;
113#endif
114}
115
116#endif /* __KERNEL__ */
117#endif /* __ASM_POWERPC_MMU_CONTEXT_H */