summaryrefslogtreecommitdiffstats
path: root/arch/mn10300/include/asm/tlbflush.h
blob: efddd6e1adeadef731997d6b78214e23e962a20c (plain)
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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
/* MN10300 TLB flushing functions
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#ifndef _ASM_TLBFLUSH_H
#define _ASM_TLBFLUSH_H

#include <linux/mm.h>
#include <asm/processor.h>

struct tlb_state {
	struct mm_struct	*active_mm;
	int			state;
};
DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);

/**
 * local_flush_tlb - Flush the current MM's entries from the local CPU's TLBs
 */
static inline void local_flush_tlb(void)
{
	int w;
	asm volatile(
		"	mov	%1,%0		\n"
		"	or	%2,%0		\n"
		"	mov	%0,%1		\n"
		: "=d"(w)
		: "m"(MMUCTR), "i"(MMUCTR_IIV|MMUCTR_DIV)
		: "cc", "memory");
}

/**
 * local_flush_tlb_all - Flush all entries from the local CPU's TLBs
 */
static inline void local_flush_tlb_all(void)
{
	local_flush_tlb();
}

/**
 * local_flush_tlb_one - Flush one entry from the local CPU's TLBs
 */
static inline void local_flush_tlb_one(unsigned long addr)
{
	local_flush_tlb();
}

/**
 * local_flush_tlb_page - Flush a page's entry from the local CPU's TLBs
 * @mm: The MM to flush for
 * @addr: The address of the target page in RAM (not its page struct)
 */
static inline
void local_flush_tlb_page(struct mm_struct *mm, unsigned long addr)
{
	unsigned long pteu, flags, cnx;

	addr &= PAGE_MASK;

	local_irq_save(flags);

	cnx = 1;
#ifdef CONFIG_MN10300_TLB_USE_PIDR
	cnx = mm->context.tlbpid[smp_processor_id()];
#endif
	if (cnx) {
		pteu = addr;
#ifdef CONFIG_MN10300_TLB_USE_PIDR
		pteu |= cnx & xPTEU_PID;
#endif
		IPTEU = pteu;
		DPTEU = pteu;
		if (IPTEL & xPTEL_V)
			IPTEL = 0;
		if (DPTEL & xPTEL_V)
			DPTEL = 0;
	}
	local_irq_restore(flags);
}

/*
 * TLB flushing:
 *
 *  - flush_tlb() flushes the current mm struct TLBs
 *  - flush_tlb_all() flushes all processes TLBs
 *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
 *  - flush_tlb_page(vma, vmaddr) flushes one page
 *  - flush_tlb_range(mm, start, end) flushes a range of pages
 *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
 */
#ifdef CONFIG_SMP

#include <asm/smp.h>

extern void flush_tlb_all(void);
extern void flush_tlb_current_task(void);
extern void flush_tlb_mm(struct mm_struct *);
extern void flush_tlb_page(struct vm_area_struct *, unsigned long);

#define flush_tlb()		flush_tlb_current_task()

static inline void flush_tlb_range(struct vm_area_struct *vma,
				   unsigned long start, unsigned long end)
{
	flush_tlb_mm(vma->vm_mm);
}

#else   /* CONFIG_SMP */

static inline void flush_tlb_all(void)
{
	preempt_disable();
	local_flush_tlb_all();
	preempt_enable();
}

static inline void flush_tlb_mm(struct mm_struct *mm)
{
	preempt_disable();
	local_flush_tlb_all();
	preempt_enable();
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
				   unsigned long start, unsigned long end)
{
	preempt_disable();
	local_flush_tlb_all();
	preempt_enable();
}

#define flush_tlb_page(vma, addr)	local_flush_tlb_page((vma)->vm_mm, addr)
#define flush_tlb()			flush_tlb_all()

#endif /* CONFIG_SMP */

static inline void flush_tlb_kernel_range(unsigned long start,
					  unsigned long end)
{
	flush_tlb_all();
}

static inline void flush_tlb_pgtables(struct mm_struct *mm,
				      unsigned long start, unsigned long end)
{
}

#endif /* _ASM_TLBFLUSH_H */
OpenPOWER on IntegriCloud