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/stringify.h>
16 #include <linux/types.h>
17 #include <asm/processor.h>
18
19 static inline unsigned long arch_local_save_flags(void)
20 {
21 unsigned long flags;
22 asm volatile("rsr %0, ps" : "=a" (flags));
23 return flags;
24 }
25
26 static inline unsigned long arch_local_irq_save(void)
27 {
28 unsigned long flags;
29 #if XTENSA_FAKE_NMI
30 #if defined(CONFIG_DEBUG_MISC) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL
31 unsigned long tmp;
32
33 asm volatile("rsr %0, ps\t\n"
34 "extui %1, %0, 0, 4\t\n"
35 "bgei %1, "__stringify(LOCKLEVEL)", 1f\t\n"
36 "rsil %0, "__stringify(LOCKLEVEL)"\n"
37 "1:"
38 : "=a" (flags), "=a" (tmp) :: "memory");
39 #else
40 asm volatile("rsr %0, ps\t\n"
41 "or %0, %0, %1\t\n"
42 "xsr %0, ps\t\n"
43 "rsync"
44 : "=&a" (flags) : "a" (LOCKLEVEL) : "memory");
45 #endif
46 #else
47 asm volatile("rsil %0, "__stringify(LOCKLEVEL)
48 : "=a" (flags) :: "memory");
49 #endif
50 return flags;
51 }
52
53 static inline void arch_local_irq_disable(void)
54 {
55 arch_local_irq_save();
56 }
57
58 static inline void arch_local_irq_enable(void)
59 {
60 unsigned long flags;
61 asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
62 }
63
64 static inline void arch_local_irq_restore(unsigned long flags)
65 {
66 asm volatile("wsr %0, ps; rsync"
67 :: "a" (flags) : "memory");
68 }
69
70 static inline bool arch_irqs_disabled_flags(unsigned long flags)
71 {
72 #if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL
73 #error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL"
74 #endif
75 return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL;
76 }
77
78 static inline bool arch_irqs_disabled(void)
79 {
80 return arch_irqs_disabled_flags(arch_local_save_flags());
81 }
82
83 #endif /* _XTENSA_IRQFLAGS_H */
84
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