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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
* Copyright (C) 1996 by Paul M. Antoine
* Copyright (C) 1999 Silicon Graphics
* Copyright (C) 2000 MIPS Technologies, Inc.
*/
#ifndef _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H
#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/stringify.h>
#include <asm/compiler.h>
#include <asm/hazards.h>
#if defined(CONFIG_CPU_MIPSR2) || defined (CONFIG_CPU_MIPSR6)
static inline void arch_local_irq_disable(void)
{
__asm__ __volatile__(
" .set push \n"
" .set noat \n"
" di \n"
" " __stringify(__irq_disable_hazard) " \n"
" .set pop \n"
: /* no outputs */
: /* no inputs */
: "memory");
}
static inline unsigned long arch_local_irq_save(void)
{
unsigned long flags;
asm __volatile__(
" .set push \n"
" .set reorder \n"
" .set noat \n"
" di %[flags] \n"
" andi %[flags], 1 \n"
" " __stringify(__irq_disable_hazard) " \n"
" .set pop \n"
: [flags] "=r" (flags)
: /* no inputs */
: "memory");
return flags;
}
static inline void arch_local_irq_restore(unsigned long flags)
{
unsigned long __tmp1;
__asm__ __volatile__(
" .set push \n"
" .set noreorder \n"
" .set noat \n"
#if defined(CONFIG_IRQ_MIPS_CPU)
/*
* Slow, but doesn't suffer from a relatively unlikely race
* condition we're having since days 1.
*/
" beqz %[flags], 1f \n"
" di \n"
" ei \n"
"1: \n"
#else
/*
* Fast, dangerous. Life is fun, life is good.
*/
" mfc0 $1, $12 \n"
" ins $1, %[flags], 0, 1 \n"
" mtc0 $1, $12 \n"
#endif
" " __stringify(__irq_disable_hazard) " \n"
" .set pop \n"
: [flags] "=r" (__tmp1)
: "0" (flags)
: "memory");
}
#else
/* Functions that require preempt_{dis,en}able() are in mips-atomic.c */
void arch_local_irq_disable(void);
unsigned long arch_local_irq_save(void);
void arch_local_irq_restore(unsigned long flags);
#endif /* CONFIG_CPU_MIPSR2 || CONFIG_CPU_MIPSR6 */
static inline void arch_local_irq_enable(void)
{
__asm__ __volatile__(
" .set push \n"
" .set reorder \n"
" .set noat \n"
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
" ei \n"
#else
" mfc0 $1,$12 \n"
" ori $1,0x1f \n"
" xori $1,0x1e \n"
" mtc0 $1,$12 \n"
#endif
" " __stringify(__irq_enable_hazard) " \n"
" .set pop \n"
: /* no outputs */
: /* no inputs */
: "memory");
}
static inline unsigned long arch_local_save_flags(void)
{
unsigned long flags;
asm __volatile__(
" .set push \n"
" .set reorder \n"
" mfc0 %[flags], $12 \n"
" .set pop \n"
: [flags] "=r" (flags));
return flags;
}
static inline int arch_irqs_disabled_flags(unsigned long flags)
{
return !(flags & 1);
}
#endif /* #ifndef __ASSEMBLY__ */
/*
* Do the CPU's IRQ-state tracing from assembly code.
*/
#ifdef CONFIG_TRACE_IRQFLAGS
/* Reload some registers clobbered by trace_hardirqs_on */
#ifdef CONFIG_64BIT
# define TRACE_IRQS_RELOAD_REGS \
LONG_L $11, PT_R11(sp); \
LONG_L $10, PT_R10(sp); \
LONG_L $9, PT_R9(sp); \
LONG_L $8, PT_R8(sp); \
LONG_L $7, PT_R7(sp); \
LONG_L $6, PT_R6(sp); \
LONG_L $5, PT_R5(sp); \
LONG_L $4, PT_R4(sp); \
LONG_L $2, PT_R2(sp)
#else
# define TRACE_IRQS_RELOAD_REGS \
LONG_L $7, PT_R7(sp); \
LONG_L $6, PT_R6(sp); \
LONG_L $5, PT_R5(sp); \
LONG_L $4, PT_R4(sp); \
LONG_L $2, PT_R2(sp)
#endif
# define TRACE_IRQS_ON \
CLI; /* make sure trace_hardirqs_on() is called in kernel level */ \
jal trace_hardirqs_on
# define TRACE_IRQS_ON_RELOAD \
TRACE_IRQS_ON; \
TRACE_IRQS_RELOAD_REGS
# define TRACE_IRQS_OFF \
jal trace_hardirqs_off
#else
# define TRACE_IRQS_ON
# define TRACE_IRQS_ON_RELOAD
# define TRACE_IRQS_OFF
#endif
#endif /* _ASM_IRQFLAGS_H */
|
