1 /*
2  *    Copyright IBM Corp. 2006,2010
3  *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
4  */
5 
6 #ifndef __ASM_IRQFLAGS_H
7 #define __ASM_IRQFLAGS_H
8 
9 #include <linux/types.h>
10 
11 /* store then OR system mask. */
12 #define __arch_local_irq_stosm(__or)					\
13 ({									\
14 	unsigned long __mask;						\
15 	asm volatile(							\
16 		"	stosm	%0,%1"					\
17 		: "=Q" (__mask) : "i" (__or) : "memory");		\
18 	__mask;								\
19 })
20 
21 /* store then AND system mask. */
22 #define __arch_local_irq_stnsm(__and)					\
23 ({									\
24 	unsigned long __mask;						\
25 	asm volatile(							\
26 		"	stnsm	%0,%1"					\
27 		: "=Q" (__mask) : "i" (__and) : "memory");		\
28 	__mask;								\
29 })
30 
31 /* set system mask. */
__arch_local_irq_ssm(unsigned long flags)32 static inline void __arch_local_irq_ssm(unsigned long flags)
33 {
34 	asm volatile("ssm   %0" : : "Q" (flags) : "memory");
35 }
36 
arch_local_save_flags(void)37 static inline unsigned long arch_local_save_flags(void)
38 {
39 	return __arch_local_irq_stosm(0x00);
40 }
41 
arch_local_irq_save(void)42 static inline unsigned long arch_local_irq_save(void)
43 {
44 	return __arch_local_irq_stnsm(0xfc);
45 }
46 
arch_local_irq_disable(void)47 static inline void arch_local_irq_disable(void)
48 {
49 	arch_local_irq_save();
50 }
51 
arch_local_irq_enable(void)52 static inline void arch_local_irq_enable(void)
53 {
54 	__arch_local_irq_stosm(0x03);
55 }
56 
arch_local_irq_restore(unsigned long flags)57 static inline void arch_local_irq_restore(unsigned long flags)
58 {
59 	__arch_local_irq_ssm(flags);
60 }
61 
arch_irqs_disabled_flags(unsigned long flags)62 static inline bool arch_irqs_disabled_flags(unsigned long flags)
63 {
64 	return !(flags & (3UL << (BITS_PER_LONG - 8)));
65 }
66 
arch_irqs_disabled(void)67 static inline bool arch_irqs_disabled(void)
68 {
69 	return arch_irqs_disabled_flags(arch_local_save_flags());
70 }
71 
72 #endif /* __ASM_IRQFLAGS_H */
73