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#include <asm/pal.h>
14
15#ifdef CONFIG_IA64_DEBUG_IRQ
16extern unsigned long last_cli_ip;
17static inline void arch_maybe_save_ip(unsigned long flags)
18{
19	if (flags & IA64_PSR_I)
20		last_cli_ip = ia64_getreg(_IA64_REG_IP);
21}
22#else
23#define arch_maybe_save_ip(flags) do {} while (0)
24#endif
25
26/*
27 * - clearing psr.i is implicitly serialized (visible by next insn)
28 * - setting psr.i requires data serialization
29 * - we need a stop-bit before reading PSR because we sometimes
30 *   write a floating-point register right before reading the PSR
31 *   and that writes to PSR.mfl
32 */
33
34static inline unsigned long arch_local_save_flags(void)
35{
36	ia64_stop();
37#ifdef CONFIG_PARAVIRT
38	return ia64_get_psr_i();
39#else
40	return ia64_getreg(_IA64_REG_PSR);
41#endif
42}
43
44static inline unsigned long arch_local_irq_save(void)
45{
46	unsigned long flags = arch_local_save_flags();
47
48	ia64_stop();
49	ia64_rsm(IA64_PSR_I);
50	arch_maybe_save_ip(flags);
51	return flags;
52}
53
54static inline void arch_local_irq_disable(void)
55{
56#ifdef CONFIG_IA64_DEBUG_IRQ
57	arch_local_irq_save();
58#else
59	ia64_stop();
60	ia64_rsm(IA64_PSR_I);
61#endif
62}
63
64static inline void arch_local_irq_enable(void)
65{
66	ia64_stop();
67	ia64_ssm(IA64_PSR_I);
68	ia64_srlz_d();
69}
70
71static inline void arch_local_irq_restore(unsigned long flags)
72{
73#ifdef CONFIG_IA64_DEBUG_IRQ
74	unsigned long old_psr = arch_local_save_flags();
75#endif
76	ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
77	arch_maybe_save_ip(old_psr & ~flags);
78}
79
80static inline bool arch_irqs_disabled_flags(unsigned long flags)
81{
82	return (flags & IA64_PSR_I) == 0;
83}
84
85static inline bool arch_irqs_disabled(void)
86{
87	return arch_irqs_disabled_flags(arch_local_save_flags());
88}
89
90static inline void arch_safe_halt(void)
91{
92	ia64_pal_halt_light();	/* PAL_HALT_LIGHT */
93}
94
95
96#endif /* _ASM_IA64_IRQFLAGS_H */