1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/asm/irqflags.h
4 *
5 * IRQ flags handling
6 *
7 * This file gets included from lowlevel asm headers too, to provide
8 * wrapped versions of the local_irq_*() APIs, based on the
9 * arch_local_irq_*() functions from the lowlevel headers.
10 */
11#ifndef _ASM_IRQFLAGS_H
12#define _ASM_IRQFLAGS_H
13
14#include <asm/pil.h>
15
16#ifndef __ASSEMBLY__
17
18static inline notrace unsigned long arch_local_save_flags(void)
19{
20	unsigned long flags;
21
22	__asm__ __volatile__(
23		"rdpr	%%pil, %0"
24		: "=r" (flags)
25	);
26
27	return flags;
28}
29
30static inline notrace void arch_local_irq_restore(unsigned long flags)
31{
32	__asm__ __volatile__(
33		"wrpr	%0, %%pil"
34		: /* no output */
35		: "r" (flags)
36		: "memory"
37	);
38}
39
40static inline notrace void arch_local_irq_disable(void)
41{
42	__asm__ __volatile__(
43		"wrpr	%0, %%pil"
44		: /* no outputs */
45		: "i" (PIL_NORMAL_MAX)
46		: "memory"
47	);
48}
49
50static inline notrace void arch_local_irq_enable(void)
51{
52	__asm__ __volatile__(
53		"wrpr	0, %%pil"
54		: /* no outputs */
55		: /* no inputs */
56		: "memory"
57	);
58}
59
60static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
61{
62	return (flags > 0);
63}
64
65static inline notrace int arch_irqs_disabled(void)
66{
67	return arch_irqs_disabled_flags(arch_local_save_flags());
68}
69
70static inline notrace unsigned long arch_local_irq_save(void)
71{
72	unsigned long flags, tmp;
73
74	/* Disable interrupts to PIL_NORMAL_MAX unless we already
75	 * are using PIL_NMI, in which case PIL_NMI is retained.
76	 *
77	 * The only values we ever program into the %pil are 0,
78	 * PIL_NORMAL_MAX and PIL_NMI.
79	 *
80	 * Since PIL_NMI is the largest %pil value and all bits are
81	 * set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
82	 * actually is.
83	 */
84	__asm__ __volatile__(
85		"rdpr	%%pil, %0\n\t"
86		"or	%0, %2, %1\n\t"
87		"wrpr	%1, 0x0, %%pil"
88		: "=r" (flags), "=r" (tmp)
89		: "i" (PIL_NORMAL_MAX)
90		: "memory"
91	);
92
93	return flags;
94}
95
96#endif /* (__ASSEMBLY__) */
97
98#endif /* !(_ASM_IRQFLAGS_H) */
99