Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
irqflags.h
Go to the documentation of this file.
1 /*
2  * IRQ flags defines.
3  *
4  * Copyright (C) 1998-2003 Hewlett-Packard Co
5  * David Mosberger-Tang <[email protected]>
6  * Copyright (C) 1999 Asit Mallick <[email protected]>
7  * Copyright (C) 1999 Don Dugger <[email protected]>
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
16 extern unsigned long last_cli_ip;
17 static 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 
34 static 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 
44 static inline unsigned long arch_local_irq_save(void)
45 {
46  unsigned long flags = arch_local_save_flags();
47 
48  ia64_stop();
50  arch_maybe_save_ip(flags);
51  return flags;
52 }
53 
54 static inline void arch_local_irq_disable(void)
55 {
56 #ifdef CONFIG_IA64_DEBUG_IRQ
58 #else
59  ia64_stop();
61 #endif
62 }
63 
64 static inline void arch_local_irq_enable(void)
65 {
66  ia64_stop();
68  ia64_srlz_d();
69 }
70 
71 static 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
77  arch_maybe_save_ip(old_psr & ~flags);
78 }
79 
80 static inline bool arch_irqs_disabled_flags(unsigned long flags)
81 {
82  return (flags & IA64_PSR_I) == 0;
83 }
84 
85 static inline bool arch_irqs_disabled(void)
86 {
88 }
89 
90 static inline void arch_safe_halt(void)
91 {
92  ia64_pal_halt_light(); /* PAL_HALT_LIGHT */
93 }
94 
95 
96 #endif /* _ASM_IA64_IRQFLAGS_H */