Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
7 * Copyright (C) 1996 by Paul M. Antoine
8 * Copyright (C) 1999 Silicon Graphics
9 * Copyright (C) 2000 MIPS Technologies, Inc.
10 */
11#ifndef _ASM_INTERRUPT_H
12#define _ASM_INTERRUPT_H
13
14#include <asm/hazards.h>
15
16__asm__ (
17 ".macro\tlocal_irq_enable\n\t"
18 ".set\tpush\n\t"
19 ".set\treorder\n\t"
20 ".set\tnoat\n\t"
21 "mfc0\t$1,$12\n\t"
22 "ori\t$1,0x1f\n\t"
23 "xori\t$1,0x1e\n\t"
24 "mtc0\t$1,$12\n\t"
25 "irq_enable_hazard\n\t"
26 ".set\tpop\n\t"
27 ".endm");
28
29static inline void local_irq_enable(void)
30{
31 __asm__ __volatile__(
32 "local_irq_enable"
33 : /* no outputs */
34 : /* no inputs */
35 : "memory");
36}
37
38/*
39 * For cli() we have to insert nops to make sure that the new value
40 * has actually arrived in the status register before the end of this
41 * macro.
42 * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
43 * no nops at all.
44 */
45__asm__ (
46 ".macro\tlocal_irq_disable\n\t"
47 ".set\tpush\n\t"
48 ".set\tnoat\n\t"
49 "mfc0\t$1,$12\n\t"
50 "ori\t$1,1\n\t"
51 "xori\t$1,1\n\t"
52 ".set\tnoreorder\n\t"
53 "mtc0\t$1,$12\n\t"
54 "irq_disable_hazard\n\t"
55 ".set\tpop\n\t"
56 ".endm");
57
58static inline void local_irq_disable(void)
59{
60 __asm__ __volatile__(
61 "local_irq_disable"
62 : /* no outputs */
63 : /* no inputs */
64 : "memory");
65}
66
67__asm__ (
68 ".macro\tlocal_save_flags flags\n\t"
69 ".set\tpush\n\t"
70 ".set\treorder\n\t"
71 "mfc0\t\\flags, $12\n\t"
72 ".set\tpop\n\t"
73 ".endm");
74
75#define local_save_flags(x) \
76__asm__ __volatile__( \
77 "local_save_flags %0" \
78 : "=r" (x))
79
80__asm__ (
81 ".macro\tlocal_irq_save result\n\t"
82 ".set\tpush\n\t"
83 ".set\treorder\n\t"
84 ".set\tnoat\n\t"
85 "mfc0\t\\result, $12\n\t"
86 "ori\t$1, \\result, 1\n\t"
87 "xori\t$1, 1\n\t"
88 ".set\tnoreorder\n\t"
89 "mtc0\t$1, $12\n\t"
90 "irq_disable_hazard\n\t"
91 ".set\tpop\n\t"
92 ".endm");
93
94#define local_irq_save(x) \
95__asm__ __volatile__( \
96 "local_irq_save\t%0" \
97 : "=r" (x) \
98 : /* no inputs */ \
99 : "memory")
100
101__asm__ (
102 ".macro\tlocal_irq_restore flags\n\t"
103 ".set\tnoreorder\n\t"
104 ".set\tnoat\n\t"
105 "mfc0\t$1, $12\n\t"
106 "andi\t\\flags, 1\n\t"
107 "ori\t$1, 1\n\t"
108 "xori\t$1, 1\n\t"
109 "or\t\\flags, $1\n\t"
110 "mtc0\t\\flags, $12\n\t"
111 "irq_disable_hazard\n\t"
112 ".set\tat\n\t"
113 ".set\treorder\n\t"
114 ".endm");
115
116#define local_irq_restore(flags) \
117do { \
118 unsigned long __tmp1; \
119 \
120 __asm__ __volatile__( \
121 "local_irq_restore\t%0" \
122 : "=r" (__tmp1) \
123 : "0" (flags) \
124 : "memory"); \
125} while(0)
126
127#define irqs_disabled() \
128({ \
129 unsigned long flags; \
130 local_save_flags(flags); \
131 !(flags & 1); \
132})
133
134#endif /* _ASM_INTERRUPT_H */