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
14 extern unsigned long last_cli_ip;
arch_maybe_save_ip(unsigned long flags)15 static 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 
arch_local_save_flags(void)32 static 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 
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 	ia64_pal_halt_light();	/* PAL_HALT_LIGHT */
91 }
92 
93 
94 #endif /* _ASM_IA64_IRQFLAGS_H */
95