1/*
 2 * IRQ flags defines.
 3 *
 4 * Copyright (C) 1998-2003 Hewlett-Packard Co
 5 *	David Mosberger-Tang <davidm@hpl.hp.com>
 6 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
 7 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
 8 */
 9
10#ifndef _ASM_IA64_IRQFLAGS_H
11#define _ASM_IA64_IRQFLAGS_H
12
13#ifdef CONFIG_IA64_DEBUG_IRQ
14extern unsigned long last_cli_ip;
15static inline void arch_maybe_save_ip(unsigned long flags)
16{
17	if (flags & IA64_PSR_I)
18		last_cli_ip = ia64_getreg(_IA64_REG_IP);
19}
20#else
21#define arch_maybe_save_ip(flags) do {} while (0)
22#endif
23
24/*
25 * - clearing psr.i is implicitly serialized (visible by next insn)
26 * - setting psr.i requires data serialization
27 * - we need a stop-bit before reading PSR because we sometimes
28 *   write a floating-point register right before reading the PSR
29 *   and that writes to PSR.mfl
30 */
31
32static inline unsigned long arch_local_save_flags(void)
33{
34	ia64_stop();
35#ifdef CONFIG_PARAVIRT
36	return ia64_get_psr_i();
37#else
38	return ia64_getreg(_IA64_REG_PSR);
39#endif
40}
41
42static 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
52static 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
62static inline void arch_local_irq_enable(void)
63{
64	ia64_stop();
65	ia64_ssm(IA64_PSR_I);
66	ia64_srlz_d();
67}
68
69static 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
78static inline bool arch_irqs_disabled_flags(unsigned long flags)
79{
80	return (flags & IA64_PSR_I) == 0;
81}
82
83static inline bool arch_irqs_disabled(void)
84{
85	return arch_irqs_disabled_flags(arch_local_save_flags());
86}
87
88static inline void arch_safe_halt(void)
89{
90	ia64_pal_halt_light();	/* PAL_HALT_LIGHT */
91}
92
93
94#endif /* _ASM_IA64_IRQFLAGS_H */