1 /*
2  *  Thumb-1 drop-in for the linux/include/asm-arm/proc-armv/system.h
3  *
4  *  (C) Copyright 2015
5  *  Albert ARIBAUD <albert.u.boot@aribaud.net>
6  *
7  * The original file does not build in Thumb mode. However, in U-Boot
8  * we don't use interrupt context, so we can redefine these as empty
9  * memory barriers, which makes Thumb-1 compiler happy.
10  *
11  *  SPDX-License-Identifier:	GPL-2.0+
12  */
13 
14 /*
15  * Use the same macro name as linux/include/asm-arm/proc-armv/system.h
16  * here, so that if the original ever gets included after us, it won't
17  * try to re-redefine anything.
18  */
19 
20 #ifndef __ASM_PROC_SYSTEM_H
21 #define __ASM_PROC_SYSTEM_H
22 
23 /*
24  * Redefine all original macros with static inline functions containing
25  * a simple memory barrier, so that they produce the same instruction
26  * ordering constraints as their original counterparts.
27  * We use static inline functions rather than macros so that we can tell
28  * the compiler to not complain about unused arguments.
29  */
30 
31 static inline void local_irq_save(
32 	unsigned long flags __attribute__((unused)))
33 {
34 	__asm__ __volatile__ ("" : : : "memory");
35 }
36 
37 static inline void local_irq_enable(void)
38 {
39 	__asm__ __volatile__ ("" : : : "memory");
40 }
41 
42 static inline void local_irq_disable(void)
43 {
44 	__asm__ __volatile__ ("" : : : "memory");
45 }
46 
47 static inline void __stf(void)
48 {
49 	__asm__ __volatile__ ("" : : : "memory");
50 }
51 
52 static inline void __clf(void)
53 {
54 	__asm__ __volatile__ ("" : : : "memory");
55 }
56 
57 static inline void local_save_flags(
58 	unsigned long flags __attribute__((unused)))
59 {
60 	__asm__ __volatile__ ("" : : : "memory");
61 }
62 
63 static inline void local_irq_restore(
64 	unsigned long flags __attribute__((unused)))
65 {
66 	__asm__ __volatile__ ("" : : : "memory");
67 }
68 
69 #endif /*  __ASM_PROC_SYSTEM_H */
70