1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * IRQ flags defines.
4  *
5  * Copyright (C) 1998-2003 Hewlett-Packard Co
6  *	David Mosberger-Tang <davidm@hpl.hp.com>
7  * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
8  * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
9  */
10 
11 #ifndef _ASM_IA64_IRQFLAGS_H
12 #define _ASM_IA64_IRQFLAGS_H
13 
14 #include <asm/pal.h>
15 #include <asm/kregs.h>
16 
17 #ifdef CONFIG_IA64_DEBUG_IRQ
18 extern unsigned long last_cli_ip;
arch_maybe_save_ip(unsigned long flags)19 static inline void arch_maybe_save_ip(unsigned long flags)
20 {
21 	if (flags & IA64_PSR_I)
22 		last_cli_ip = ia64_getreg(_IA64_REG_IP);
23 }
24 #else
25 #define arch_maybe_save_ip(flags) do {} while (0)
26 #endif
27 
28 /*
29  * - clearing psr.i is implicitly serialized (visible by next insn)
30  * - setting psr.i requires data serialization
31  * - we need a stop-bit before reading PSR because we sometimes
32  *   write a floating-point register right before reading the PSR
33  *   and that writes to PSR.mfl
34  */
35 
arch_local_save_flags(void)36 static inline unsigned long arch_local_save_flags(void)
37 {
38 	ia64_stop();
39 	return ia64_getreg(_IA64_REG_PSR);
40 }
41 
arch_local_irq_save(void)42 static inline unsigned long arch_local_irq_save(void)
43 {
44 	unsigned long flags = arch_local_save_flags();
45 
46 	ia64_stop();
47 	ia64_rsm(IA64_PSR_I);
48 	arch_maybe_save_ip(flags);
49 	return flags;
50 }
51 
arch_local_irq_disable(void)52 static inline void arch_local_irq_disable(void)
53 {
54 #ifdef CONFIG_IA64_DEBUG_IRQ
55 	arch_local_irq_save();
56 #else
57 	ia64_stop();
58 	ia64_rsm(IA64_PSR_I);
59 #endif
60 }
61 
arch_local_irq_enable(void)62 static inline void arch_local_irq_enable(void)
63 {
64 	ia64_stop();
65 	ia64_ssm(IA64_PSR_I);
66 	ia64_srlz_d();
67 }
68 
arch_local_irq_restore(unsigned long flags)69 static inline void arch_local_irq_restore(unsigned long flags)
70 {
71 #ifdef CONFIG_IA64_DEBUG_IRQ
72 	unsigned long old_psr = arch_local_save_flags();
73 #endif
74 	ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
75 	arch_maybe_save_ip(old_psr & ~flags);
76 }
77 
arch_irqs_disabled_flags(unsigned long flags)78 static inline bool arch_irqs_disabled_flags(unsigned long flags)
79 {
80 	return (flags & IA64_PSR_I) == 0;
81 }
82 
arch_irqs_disabled(void)83 static inline bool arch_irqs_disabled(void)
84 {
85 	return arch_irqs_disabled_flags(arch_local_save_flags());
86 }
87 
arch_safe_halt(void)88 static inline void arch_safe_halt(void)
89 {
90 	arch_local_irq_enable();
91 	ia64_pal_halt_light();	/* PAL_HALT_LIGHT */
92 }
93 
94 
95 #endif /* _ASM_IA64_IRQFLAGS_H */
96