1 /* 1
2 * This file is subject to the terms and condi
3 * License. See the file "COPYING" in the mai
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 200
7 * Copyright (C) 1996 by Paul M. Antoine
8 * Copyright (C) 1999 Silicon Graphics
9 * Copyright (C) 2000 MIPS Technologies, Inc.
10 */
11 #include <asm/irqflags.h>
12 #include <asm/hazards.h>
13 #include <linux/compiler.h>
14 #include <linux/preempt.h>
15 #include <linux/export.h>
16 #include <linux/stringify.h>
17
18 #if !defined(CONFIG_CPU_HAS_DIEI)
19
20 /*
21 * For cli() we have to insert nops to make su
22 * has actually arrived in the status register
23 * macro.
24 * R4000/R4400 need three nops, the R4600 two
25 * no nops at all.
26 */
27 /*
28 * For TX49, operating only IE bit is not enou
29 *
30 * If mfc0 $12 follows store and the mfc0 is l
31 * page and fetching the next instruction caus
32 * of the mfc0 might wrongly contain EXL bit.
33 *
34 * ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3
35 *
36 * Workaround: mask EXL bit of the result or p
37 */
38 notrace void arch_local_irq_disable(void)
39 {
40 preempt_disable_notrace();
41
42 __asm__ __volatile__(
43 " .set push
44 " .set noat
45 " mfc0 $1,$12
46 " ori $1,0x1f
47 " xori $1,0x1f
48 " .set noreorder
49 " mtc0 $1,$12
50 " " __stringify(__irq_disable_ha
51 " .set pop
52 : /* no outputs */
53 : /* no inputs */
54 : "memory");
55
56 preempt_enable_notrace();
57 }
58 EXPORT_SYMBOL(arch_local_irq_disable);
59
60 notrace unsigned long arch_local_irq_save(void
61 {
62 unsigned long flags;
63
64 preempt_disable_notrace();
65
66 __asm__ __volatile__(
67 " .set push
68 " .set reorder
69 " .set noat
70 " mfc0 %[flags], $12
71 " ori $1, %[flags], 0x1f
72 " xori $1, 0x1f
73 " .set noreorder
74 " mtc0 $1, $12
75 " " __stringify(__irq_disable_ha
76 " .set pop
77 : [flags] "=r" (flags)
78 : /* no inputs */
79 : "memory");
80
81 preempt_enable_notrace();
82
83 return flags;
84 }
85 EXPORT_SYMBOL(arch_local_irq_save);
86
87 notrace void arch_local_irq_restore(unsigned l
88 {
89 unsigned long __tmp1;
90
91 preempt_disable_notrace();
92
93 __asm__ __volatile__(
94 " .set push
95 " .set noreorder
96 " .set noat
97 " mfc0 $1, $12
98 " andi %[flags], 1
99 " ori $1, 0x1f
100 " xori $1, 0x1f
101 " or %[flags], $1
102 " mtc0 %[flags], $12
103 " " __stringify(__irq_disable_ha
104 " .set pop
105 : [flags] "=r" (__tmp1)
106 : "" (flags)
107 : "memory");
108
109 preempt_enable_notrace();
110 }
111 EXPORT_SYMBOL(arch_local_irq_restore);
112
113 #endif /* !CONFIG_CPU_HAS_DIEI */
114
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