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
17static inline unsigned long arch_local_save_flags(void)
18{
19	unsigned long flags;
20	asm volatile("rsr %0, ps" : "=a" (flags));
21	return flags;
22}
23
24static inline unsigned long arch_local_irq_save(void)
25{
26	unsigned long flags;
27#if XTENSA_FAKE_NMI
28#if defined(CONFIG_DEBUG_KERNEL) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL
29	unsigned long tmp;
30
31	asm volatile("rsr	%0, ps\t\n"
32		     "extui	%1, %0, 0, 4\t\n"
33		     "bgei	%1, "__stringify(LOCKLEVEL)", 1f\t\n"
34		     "rsil	%0, "__stringify(LOCKLEVEL)"\n"
35		     "1:"
36		     : "=a" (flags), "=a" (tmp) :: "memory");
37#else
38	asm volatile("rsr	%0, ps\t\n"
39		     "or	%0, %0, %1\t\n"
40		     "xsr	%0, ps\t\n"
41		     "rsync"
42		     : "=&a" (flags) : "a" (LOCKLEVEL) : "memory");
43#endif
44#else
45	asm volatile("rsil	%0, "__stringify(LOCKLEVEL)
46		     : "=a" (flags) :: "memory");
47#endif
48	return flags;
49}
50
51static inline void arch_local_irq_disable(void)
52{
53	arch_local_irq_save();
54}
55
56static inline void arch_local_irq_enable(void)
57{
58	unsigned long flags;
59	asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
60}
61
62static inline void arch_local_irq_restore(unsigned long flags)
63{
64	asm volatile("wsr %0, ps; rsync"
65		     :: "a" (flags) : "memory");
66}
67
68static inline bool arch_irqs_disabled_flags(unsigned long flags)
69{
70#if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL
71#error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL"
72#endif
73	return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL;
74}
75
76static inline bool arch_irqs_disabled(void)
77{
78	return arch_irqs_disabled_flags(arch_local_save_flags());
79}
80
81#endif /* _XTENSA_IRQFLAGS_H */
82