mirror of
https://github.com/AsahiLinux/u-boot
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70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
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/*
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* Thumb-1 drop-in for the linux/include/asm-arm/proc-armv/system.h
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*
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* (C) Copyright 2015
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* Albert ARIBAUD <albert.u.boot@aribaud.net>
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*
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* The original file does not build in Thumb mode. However, in U-Boot
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* we don't use interrupt context, so we can redefine these as empty
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* memory barriers, which makes Thumb-1 compiler happy.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Use the same macro name as linux/include/asm-arm/proc-armv/system.h
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* here, so that if the original ever gets included after us, it won't
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* try to re-redefine anything.
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*/
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#ifndef __ASM_PROC_SYSTEM_H
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#define __ASM_PROC_SYSTEM_H
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/*
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* Redefine all original macros with static inline functions containing
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* a simple memory barrier, so that they produce the same instruction
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* ordering constraints as their original counterparts.
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* We use static inline functions rather than macros so that we can tell
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* the compiler to not complain about unused arguments.
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*/
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static inline void local_irq_save(
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unsigned long flags __attribute__((unused)))
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{
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__asm__ __volatile__ ("" : : : "memory");
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}
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static inline void local_irq_enable(void)
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{
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__asm__ __volatile__ ("" : : : "memory");
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}
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static inline void local_irq_disable(void)
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{
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__asm__ __volatile__ ("" : : : "memory");
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}
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static inline void __stf(void)
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{
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__asm__ __volatile__ ("" : : : "memory");
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}
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static inline void __clf(void)
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{
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__asm__ __volatile__ ("" : : : "memory");
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}
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static inline void local_save_flags(
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unsigned long flags __attribute__((unused)))
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{
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__asm__ __volatile__ ("" : : : "memory");
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}
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static inline void local_irq_restore(
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unsigned long flags __attribute__((unused)))
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{
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__asm__ __volatile__ ("" : : : "memory");
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}
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#endif /* __ASM_PROC_SYSTEM_H */
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