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
|
/*
* Xtensa IRQ flags handling functions
*
* 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) 2001 - 2005 Tensilica Inc.
* Copyright (C) 2015 Cadence Design Systems Inc.
*/
#ifndef _XTENSA_IRQFLAGS_H
#define _XTENSA_IRQFLAGS_H
#include <linux/stringify.h>
#include <linux/types.h>
#include <asm/processor.h>
static inline unsigned long arch_local_save_flags(void)
{
unsigned long flags;
asm volatile("rsr %0, ps" : "=a" (flags));
return flags;
}
static inline unsigned long arch_local_irq_save(void)
{
unsigned long flags;
#if XTENSA_FAKE_NMI
#if defined(CONFIG_DEBUG_KERNEL) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL
unsigned long tmp;
asm volatile("rsr %0, ps\t\n"
"extui %1, %0, 0, 4\t\n"
"bgei %1, "__stringify(LOCKLEVEL)", 1f\t\n"
"rsil %0, "__stringify(LOCKLEVEL)"\n"
"1:"
: "=a" (flags), "=a" (tmp) :: "memory");
#else
asm volatile("rsr %0, ps\t\n"
"or %0, %0, %1\t\n"
"xsr %0, ps\t\n"
"rsync"
: "=&a" (flags) : "a" (LOCKLEVEL) : "memory");
#endif
#else
asm volatile("rsil %0, "__stringify(LOCKLEVEL)
: "=a" (flags) :: "memory");
#endif
return flags;
}
static inline void arch_local_irq_disable(void)
{
arch_local_irq_save();
}
static inline void arch_local_irq_enable(void)
{
unsigned long flags;
asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
}
static inline void arch_local_irq_restore(unsigned long flags)
{
asm volatile("wsr %0, ps; rsync"
:: "a" (flags) : "memory");
}
static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
#if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL
#error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL"
#endif
return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL;
}
static inline bool arch_irqs_disabled(void)
{
return arch_irqs_disabled_flags(arch_local_save_flags());
}
#endif /* _XTENSA_IRQFLAGS_H */
|
