1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
#ifndef __ASM_POWERPC_MMU_CONTEXT_H
#define __ASM_POWERPC_MMU_CONTEXT_H
#ifdef __KERNEL__
#ifndef CONFIG_PPC64
#include <asm-ppc/mmu_context.h>
#else
#include <linux/kernel.h>
#include <linux/mm.h>
#include <asm/mmu.h>
#include <asm/cputable.h>
/*
* Copyright (C) 2001 PPC 64 Team, IBM Corp
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
/*
* Getting into a kernel thread, there is no valid user segment, mark
* paca->pgdir NULL so that SLB miss on user addresses will fault
*/
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
#ifdef CONFIG_PPC_64K_PAGES
get_paca()->pgdir = NULL;
#endif /* CONFIG_PPC_64K_PAGES */
}
#define NO_CONTEXT 0
#define MAX_CONTEXT (0x100000-1)
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
extern void destroy_context(struct mm_struct *mm);
extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
/*
* switch_mm is the entry point called from the architecture independent
* code in kernel/sched.c
*/
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
cpu_set(smp_processor_id(), next->cpu_vm_mask);
/* No need to flush userspace segments if the mm doesnt change */
#ifdef CONFIG_PPC_64K_PAGES
if (prev == next && get_paca()->pgdir == next->pgd)
return;
#else
if (prev == next)
return;
#endif /* CONFIG_PPC_64K_PAGES */
#ifdef CONFIG_ALTIVEC
if (cpu_has_feature(CPU_FTR_ALTIVEC))
asm volatile ("dssall");
#endif /* CONFIG_ALTIVEC */
if (cpu_has_feature(CPU_FTR_SLB))
switch_slb(tsk, next);
else
switch_stab(tsk, next);
}
#define deactivate_mm(tsk,mm) do { } while (0)
/*
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
unsigned long flags;
local_irq_save(flags);
switch_mm(prev, next, current);
local_irq_restore(flags);
}
#endif /* CONFIG_PPC64 */
#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
|
