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
arch_local_save_flags(void)18 static 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
arch_local_irq_save(void)25 static 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
arch_local_irq_disable(void)52 static inline void arch_local_irq_disable(void)
53 {
54 arch_local_irq_save();
55 }
56
arch_local_irq_enable(void)57 static inline void arch_local_irq_enable(void)
58 {
59 unsigned long flags;
60 asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
61 }
62
arch_local_irq_restore(unsigned long flags)63 static inline void arch_local_irq_restore(unsigned long flags)
64 {
65 asm volatile("wsr %0, ps; rsync"
66 :: "a" (flags) : "memory");
67 }
68
arch_irqs_disabled_flags(unsigned long flags)69 static 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
arch_irqs_disabled(void)77 static inline bool arch_irqs_disabled(void)
78 {
79 return arch_irqs_disabled_flags(arch_local_save_flags());
80 }
81
82 #endif /* _XTENSA_IRQFLAGS_H */
83