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 * arch_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
17static inline notrace unsigned long arch_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
29static inline notrace void arch_local_irq_restore(unsigned long flags)
30{
31	__asm__ __volatile__(
32		"wrpr	%0, %%pil"
33		: /* no output */
34		: "r" (flags)
35		: "memory"
36	);
37}
38
39static inline notrace void arch_local_irq_disable(void)
40{
41	__asm__ __volatile__(
42		"wrpr	%0, %%pil"
43		: /* no outputs */
44		: "i" (PIL_NORMAL_MAX)
45		: "memory"
46	);
47}
48
49static inline notrace void arch_local_irq_enable(void)
50{
51	__asm__ __volatile__(
52		"wrpr	0, %%pil"
53		: /* no outputs */
54		: /* no inputs */
55		: "memory"
56	);
57}
58
59static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
60{
61	return (flags > 0);
62}
63
64static inline notrace int arch_irqs_disabled(void)
65{
66	return arch_irqs_disabled_flags(arch_local_save_flags());
67}
68
69static inline notrace unsigned long arch_local_irq_save(void)
70{
71	unsigned long flags, tmp;
72
73	/* Disable interrupts to PIL_NORMAL_MAX unless we already
74	 * are using PIL_NMI, in which case PIL_NMI is retained.
75	 *
76	 * The only values we ever program into the %pil are 0,
77	 * PIL_NORMAL_MAX and PIL_NMI.
78	 *
79	 * Since PIL_NMI is the largest %pil value and all bits are
80	 * set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
81	 * actually is.
82	 */
83	__asm__ __volatile__(
84		"rdpr	%%pil, %0\n\t"
85		"or	%0, %2, %1\n\t"
86		"wrpr	%1, 0x0, %%pil"
87		: "=r" (flags), "=r" (tmp)
88		: "i" (PIL_NORMAL_MAX)
89		: "memory"
90	);
91
92	return flags;
93}
94
95#endif /* (__ASSEMBLY__) */
96
97#endif /* !(_ASM_IRQFLAGS_H) */
98