1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * include/asm/irqflags.h
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * IRQ flags handling
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * This file gets included from lowlevel asm headers too, to provide
8*4882a593Smuzhiyun * wrapped versions of the local_irq_*() APIs, based on the
9*4882a593Smuzhiyun * arch_local_irq_*() functions from the lowlevel headers.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun #ifndef _ASM_IRQFLAGS_H
12*4882a593Smuzhiyun #define _ASM_IRQFLAGS_H
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <asm/pil.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #ifndef __ASSEMBLY__
17*4882a593Smuzhiyun
arch_local_save_flags(void)18*4882a593Smuzhiyun static inline notrace unsigned long arch_local_save_flags(void)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun unsigned long flags;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun __asm__ __volatile__(
23*4882a593Smuzhiyun "rdpr %%pil, %0"
24*4882a593Smuzhiyun : "=r" (flags)
25*4882a593Smuzhiyun );
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun return flags;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
arch_local_irq_restore(unsigned long flags)30*4882a593Smuzhiyun static inline notrace void arch_local_irq_restore(unsigned long flags)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun __asm__ __volatile__(
33*4882a593Smuzhiyun "wrpr %0, %%pil"
34*4882a593Smuzhiyun : /* no output */
35*4882a593Smuzhiyun : "r" (flags)
36*4882a593Smuzhiyun : "memory"
37*4882a593Smuzhiyun );
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
arch_local_irq_disable(void)40*4882a593Smuzhiyun static inline notrace void arch_local_irq_disable(void)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun __asm__ __volatile__(
43*4882a593Smuzhiyun "wrpr %0, %%pil"
44*4882a593Smuzhiyun : /* no outputs */
45*4882a593Smuzhiyun : "i" (PIL_NORMAL_MAX)
46*4882a593Smuzhiyun : "memory"
47*4882a593Smuzhiyun );
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
arch_local_irq_enable(void)50*4882a593Smuzhiyun static inline notrace void arch_local_irq_enable(void)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun __asm__ __volatile__(
53*4882a593Smuzhiyun "wrpr 0, %%pil"
54*4882a593Smuzhiyun : /* no outputs */
55*4882a593Smuzhiyun : /* no inputs */
56*4882a593Smuzhiyun : "memory"
57*4882a593Smuzhiyun );
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
arch_irqs_disabled_flags(unsigned long flags)60*4882a593Smuzhiyun static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun return (flags > 0);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
arch_irqs_disabled(void)65*4882a593Smuzhiyun static inline notrace int arch_irqs_disabled(void)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun return arch_irqs_disabled_flags(arch_local_save_flags());
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
arch_local_irq_save(void)70*4882a593Smuzhiyun static inline notrace unsigned long arch_local_irq_save(void)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun unsigned long flags, tmp;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun /* Disable interrupts to PIL_NORMAL_MAX unless we already
75*4882a593Smuzhiyun * are using PIL_NMI, in which case PIL_NMI is retained.
76*4882a593Smuzhiyun *
77*4882a593Smuzhiyun * The only values we ever program into the %pil are 0,
78*4882a593Smuzhiyun * PIL_NORMAL_MAX and PIL_NMI.
79*4882a593Smuzhiyun *
80*4882a593Smuzhiyun * Since PIL_NMI is the largest %pil value and all bits are
81*4882a593Smuzhiyun * set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
82*4882a593Smuzhiyun * actually is.
83*4882a593Smuzhiyun */
84*4882a593Smuzhiyun __asm__ __volatile__(
85*4882a593Smuzhiyun "rdpr %%pil, %0\n\t"
86*4882a593Smuzhiyun "or %0, %2, %1\n\t"
87*4882a593Smuzhiyun "wrpr %1, 0x0, %%pil"
88*4882a593Smuzhiyun : "=r" (flags), "=r" (tmp)
89*4882a593Smuzhiyun : "i" (PIL_NORMAL_MAX)
90*4882a593Smuzhiyun : "memory"
91*4882a593Smuzhiyun );
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun return flags;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun #endif /* (__ASSEMBLY__) */
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun #endif /* !(_ASM_IRQFLAGS_H) */
99