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1#ifndef __PPC64_MMU_CONTEXT_H
2#define __PPC64_MMU_CONTEXT_H
3
4#include <linux/config.h>
5#include <linux/kernel.h>
6#include <linux/mm.h>
7#include <asm/mmu.h>
8#include <asm/cputable.h>
9
10/*
11 * Copyright (C) 2001 PPC 64 Team, IBM Corp
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18
19/*
20 * Every architecture must define this function. It's the fastest
21 * way of searching a 140-bit bitmap where the first 100 bits are
22 * unlikely to be set. It's guaranteed that at least one of the 140
23 * bits is cleared.
24 */
25static inline int sched_find_first_bit(unsigned long *b)
26{
27 if (unlikely(b[0]))
28 return __ffs(b[0]);
29 if (unlikely(b[1]))
30 return __ffs(b[1]) + 64;
31 return __ffs(b[2]) + 128;
32}
33
34static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
35{
36}
37
38#define NO_CONTEXT 0
39#define MAX_CONTEXT (0x100000-1)
40
41extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
42extern void destroy_context(struct mm_struct *mm);
43
44extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
45extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
46
47/*
48 * switch_mm is the entry point called from the architecture independent
49 * code in kernel/sched.c
50 */
51static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
52 struct task_struct *tsk)
53{
54 if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
55 cpu_set(smp_processor_id(), next->cpu_vm_mask);
56
57 /* No need to flush userspace segments if the mm doesnt change */
58 if (prev == next)
59 return;
60
61#ifdef CONFIG_ALTIVEC
62 if (cpu_has_feature(CPU_FTR_ALTIVEC))
63 asm volatile ("dssall");
64#endif /* CONFIG_ALTIVEC */
65
66 if (cpu_has_feature(CPU_FTR_SLB))
67 switch_slb(tsk, next);
68 else
69 switch_stab(tsk, next);
70}
71
72#define deactivate_mm(tsk,mm) do { } while (0)
73
74/*
75 * After we have set current->mm to a new value, this activates
76 * the context for the new mm so we see the new mappings.
77 */
78static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
79{
80 unsigned long flags;
81
82 local_irq_save(flags);
83 switch_mm(prev, next, current);
84 local_irq_restore(flags);
85}
86
87#endif /* __PPC64_MMU_CONTEXT_H */