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Linux kernel mirror (for testing)
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linux
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 */