tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Xtensa IRQ flags handling functions
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
9 * Copyright (C) 2015 Cadence Design Systems Inc.
10 */
11
12#ifndef _XTENSA_IRQFLAGS_H
13#define _XTENSA_IRQFLAGS_H
14
15#include <linux/types.h>
16#include <asm/processor.h>
17
18static inline unsigned long arch_local_save_flags(void)
19{
20 unsigned long flags;
21 asm volatile("rsr %0, ps" : "=a" (flags));
22 return flags;
23}
24
25static inline unsigned long arch_local_irq_save(void)
26{
27 unsigned long flags;
28#if XTENSA_FAKE_NMI
29#if defined(CONFIG_DEBUG_KERNEL) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL
30 unsigned long tmp;
31
32 asm volatile("rsr %0, ps\t\n"
33 "extui %1, %0, 0, 4\t\n"
34 "bgei %1, "__stringify(LOCKLEVEL)", 1f\t\n"
35 "rsil %0, "__stringify(LOCKLEVEL)"\n"
36 "1:"
37 : "=a" (flags), "=a" (tmp) :: "memory");
38#else
39 asm volatile("rsr %0, ps\t\n"
40 "or %0, %0, %1\t\n"
41 "xsr %0, ps\t\n"
42 "rsync"
43 : "=&a" (flags) : "a" (LOCKLEVEL) : "memory");
44#endif
45#else
46 asm volatile("rsil %0, "__stringify(LOCKLEVEL)
47 : "=a" (flags) :: "memory");
48#endif
49 return flags;
50}
51
52static inline void arch_local_irq_disable(void)
53{
54 arch_local_irq_save();
55}
56
57static inline void arch_local_irq_enable(void)
58{
59 unsigned long flags;
60 asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
61}
62
63static inline void arch_local_irq_restore(unsigned long flags)
64{
65 asm volatile("wsr %0, ps; rsync"
66 :: "a" (flags) : "memory");
67}
68
69static inline bool arch_irqs_disabled_flags(unsigned long flags)
70{
71#if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL
72#error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL"
73#endif
74 return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL;
75}
76
77static inline bool arch_irqs_disabled(void)
78{
79 return arch_irqs_disabled_flags(arch_local_save_flags());
80}
81
82#endif /* _XTENSA_IRQFLAGS_H */