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Linux kernel mirror (for testing)
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kernel
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linux
1#ifndef __ASM_POWERPC_MMU_CONTEXT_H
2#define __ASM_POWERPC_MMU_CONTEXT_H
3
4#ifndef CONFIG_PPC64
5#include <asm-ppc/mmu_context.h>
6#else
7
8#include <linux/kernel.h>
9#include <linux/mm.h>
10#include <asm/mmu.h>
11#include <asm/cputable.h>
12
13/*
14 * Copyright (C) 2001 PPC 64 Team, IBM Corp
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 */
21
22/*
23 * Getting into a kernel thread, there is no valid user segment, mark
24 * paca->pgdir NULL so that SLB miss on user addresses will fault
25 */
26static inline void enter_lazy_tlb(struct mm_struct *mm,
27 struct task_struct *tsk)
28{
29#ifdef CONFIG_PPC_64K_PAGES
30 get_paca()->pgdir = NULL;
31#endif /* CONFIG_PPC_64K_PAGES */
32}
33
34#define NO_CONTEXT 0
35#define MAX_CONTEXT (0x100000-1)
36
37extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
38extern void destroy_context(struct mm_struct *mm);
39
40extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
41extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
42
43/*
44 * switch_mm is the entry point called from the architecture independent
45 * code in kernel/sched.c
46 */
47static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
48 struct task_struct *tsk)
49{
50 if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
51 cpu_set(smp_processor_id(), next->cpu_vm_mask);
52
53 /* No need to flush userspace segments if the mm doesnt change */
54#ifdef CONFIG_PPC_64K_PAGES
55 if (prev == next && get_paca()->pgdir == next->pgd)
56 return;
57#else
58 if (prev == next)
59 return;
60#endif /* CONFIG_PPC_64K_PAGES */
61
62#ifdef CONFIG_ALTIVEC
63 if (cpu_has_feature(CPU_FTR_ALTIVEC))
64 asm volatile ("dssall");
65#endif /* CONFIG_ALTIVEC */
66
67 if (cpu_has_feature(CPU_FTR_SLB))
68 switch_slb(tsk, next);
69 else
70 switch_stab(tsk, next);
71}
72
73#define deactivate_mm(tsk,mm) do { } while (0)
74
75/*
76 * After we have set current->mm to a new value, this activates
77 * the context for the new mm so we see the new mappings.
78 */
79static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
80{
81 unsigned long flags;
82
83 local_irq_save(flags);
84 switch_mm(prev, next, current);
85 local_irq_restore(flags);
86}
87
88#endif /* CONFIG_PPC64 */
89#endif /* __ASM_POWERPC_MMU_CONTEXT_H */