1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_ARM_IRQFLAGS_H
3 #define __ASM_ARM_IRQFLAGS_H
4
5 #ifdef __KERNEL__
6
7 #include <asm/ptrace.h>
8
9 /*
10 * CPU interrupt mask handling.
11 */
12 #ifdef CONFIG_CPU_V7M
13 #define IRQMASK_REG_NAME_R "primask"
14 #define IRQMASK_REG_NAME_W "primask"
15 #define IRQMASK_I_BIT 1
16 #else
17 #define IRQMASK_REG_NAME_R "cpsr"
18 #define IRQMASK_REG_NAME_W "cpsr_c"
19 #define IRQMASK_I_BIT PSR_I_BIT
20 #endif
21
22 #if __LINUX_ARM_ARCH__ >= 6
23
24 #define arch_local_irq_save arch_local_irq_save
arch_local_irq_save(void)25 static inline unsigned long arch_local_irq_save(void)
26 {
27 unsigned long flags;
28
29 asm volatile(
30 " mrs %0, " IRQMASK_REG_NAME_R " @ arch_local_irq_save\n"
31 " cpsid i"
32 : "=r" (flags) : : "memory", "cc");
33 return flags;
34 }
35
36 #define arch_local_irq_enable arch_local_irq_enable
arch_local_irq_enable(void)37 static inline void arch_local_irq_enable(void)
38 {
39 asm volatile(
40 " cpsie i @ arch_local_irq_enable"
41 :
42 :
43 : "memory", "cc");
44 }
45
46 #define arch_local_irq_disable arch_local_irq_disable
arch_local_irq_disable(void)47 static inline void arch_local_irq_disable(void)
48 {
49 asm volatile(
50 " cpsid i @ arch_local_irq_disable"
51 :
52 :
53 : "memory", "cc");
54 }
55
56 #define local_fiq_enable() __asm__("cpsie f @ __stf" : : : "memory", "cc")
57 #define local_fiq_disable() __asm__("cpsid f @ __clf" : : : "memory", "cc")
58
59 #ifndef CONFIG_CPU_V7M
60 #define local_abt_enable() __asm__("cpsie a @ __sta" : : : "memory", "cc")
61 #define local_abt_disable() __asm__("cpsid a @ __cla" : : : "memory", "cc")
62 #else
63 #define local_abt_enable() do { } while (0)
64 #define local_abt_disable() do { } while (0)
65 #endif
66 #else
67
68 /*
69 * Save the current interrupt enable state & disable IRQs
70 */
71 #define arch_local_irq_save arch_local_irq_save
arch_local_irq_save(void)72 static inline unsigned long arch_local_irq_save(void)
73 {
74 unsigned long flags, temp;
75
76 asm volatile(
77 " mrs %0, cpsr @ arch_local_irq_save\n"
78 " orr %1, %0, #128\n"
79 " msr cpsr_c, %1"
80 : "=r" (flags), "=r" (temp)
81 :
82 : "memory", "cc");
83 return flags;
84 }
85
86 /*
87 * Enable IRQs
88 */
89 #define arch_local_irq_enable arch_local_irq_enable
arch_local_irq_enable(void)90 static inline void arch_local_irq_enable(void)
91 {
92 unsigned long temp;
93 asm volatile(
94 " mrs %0, cpsr @ arch_local_irq_enable\n"
95 " bic %0, %0, #128\n"
96 " msr cpsr_c, %0"
97 : "=r" (temp)
98 :
99 : "memory", "cc");
100 }
101
102 /*
103 * Disable IRQs
104 */
105 #define arch_local_irq_disable arch_local_irq_disable
arch_local_irq_disable(void)106 static inline void arch_local_irq_disable(void)
107 {
108 unsigned long temp;
109 asm volatile(
110 " mrs %0, cpsr @ arch_local_irq_disable\n"
111 " orr %0, %0, #128\n"
112 " msr cpsr_c, %0"
113 : "=r" (temp)
114 :
115 : "memory", "cc");
116 }
117
118 /*
119 * Enable FIQs
120 */
121 #define local_fiq_enable() \
122 ({ \
123 unsigned long temp; \
124 __asm__ __volatile__( \
125 "mrs %0, cpsr @ stf\n" \
126 " bic %0, %0, #64\n" \
127 " msr cpsr_c, %0" \
128 : "=r" (temp) \
129 : \
130 : "memory", "cc"); \
131 })
132
133 /*
134 * Disable FIQs
135 */
136 #define local_fiq_disable() \
137 ({ \
138 unsigned long temp; \
139 __asm__ __volatile__( \
140 "mrs %0, cpsr @ clf\n" \
141 " orr %0, %0, #64\n" \
142 " msr cpsr_c, %0" \
143 : "=r" (temp) \
144 : \
145 : "memory", "cc"); \
146 })
147
148 #define local_abt_enable() do { } while (0)
149 #define local_abt_disable() do { } while (0)
150 #endif
151
152 /*
153 * Save the current interrupt enable state.
154 */
155 #define arch_local_save_flags arch_local_save_flags
arch_local_save_flags(void)156 static inline unsigned long arch_local_save_flags(void)
157 {
158 unsigned long flags;
159 asm volatile(
160 " mrs %0, " IRQMASK_REG_NAME_R " @ local_save_flags"
161 : "=r" (flags) : : "memory", "cc");
162 return flags;
163 }
164
165 /*
166 * restore saved IRQ & FIQ state
167 */
168 #define arch_local_irq_restore arch_local_irq_restore
arch_local_irq_restore(unsigned long flags)169 static inline void arch_local_irq_restore(unsigned long flags)
170 {
171 asm volatile(
172 " msr " IRQMASK_REG_NAME_W ", %0 @ local_irq_restore"
173 :
174 : "r" (flags)
175 : "memory", "cc");
176 }
177
178 #define arch_irqs_disabled_flags arch_irqs_disabled_flags
arch_irqs_disabled_flags(unsigned long flags)179 static inline int arch_irqs_disabled_flags(unsigned long flags)
180 {
181 return flags & IRQMASK_I_BIT;
182 }
183
184 #include <asm-generic/irqflags.h>
185
186 #endif /* ifdef __KERNEL__ */
187 #endif /* ifndef __ASM_ARM_IRQFLAGS_H */
188