1 /*
2  * include/asm/irqflags.h
3  *
4  * IRQ flags handling
5  *
6  * This file gets included from lowlevel asm headers too, to provide
7  * wrapped versions of the local_irq_*() APIs, based on the
8  * raw_local_irq_*() functions from the lowlevel headers.
9  */
10 #ifndef _ASM_IRQFLAGS_H
11 #define _ASM_IRQFLAGS_H
12 
13 #include <asm/pil.h>
14 
15 #ifndef __ASSEMBLY__
16 
17 static inline unsigned long __raw_local_save_flags(void)
18 {
19 	unsigned long flags;
20 
21 	__asm__ __volatile__(
22 		"rdpr	%%pil, %0"
23 		: "=r" (flags)
24 	);
25 
26 	return flags;
27 }
28 
29 #define raw_local_save_flags(flags) \
30 		do { (flags) = __raw_local_save_flags(); } while (0)
31 
32 static inline void raw_local_irq_restore(unsigned long flags)
33 {
34 	__asm__ __volatile__(
35 		"wrpr	%0, %%pil"
36 		: /* no output */
37 		: "r" (flags)
38 		: "memory"
39 	);
40 }
41 
42 static inline void raw_local_irq_disable(void)
43 {
44 	__asm__ __volatile__(
45 		"wrpr	%0, %%pil"
46 		: /* no outputs */
47 		: "i" (PIL_NORMAL_MAX)
48 		: "memory"
49 	);
50 }
51 
52 static inline void raw_local_irq_enable(void)
53 {
54 	__asm__ __volatile__(
55 		"wrpr	0, %%pil"
56 		: /* no outputs */
57 		: /* no inputs */
58 		: "memory"
59 	);
60 }
61 
62 static inline int raw_irqs_disabled_flags(unsigned long flags)
63 {
64 	return (flags > 0);
65 }
66 
67 static inline int raw_irqs_disabled(void)
68 {
69 	unsigned long flags = __raw_local_save_flags();
70 
71 	return raw_irqs_disabled_flags(flags);
72 }
73 
74 /*
75  * For spinlocks, etc:
76  */
77 static inline unsigned long __raw_local_irq_save(void)
78 {
79 	unsigned long flags = __raw_local_save_flags();
80 
81 	raw_local_irq_disable();
82 
83 	return flags;
84 }
85 
86 #define raw_local_irq_save(flags) \
87 		do { (flags) = __raw_local_irq_save(); } while (0)
88 
89 #endif /* (__ASSEMBLY__) */
90 
91 #endif /* !(_ASM_IRQFLAGS_H) */
92