f934af05cb
arch_local_irq_save() and friends are required to act as compiler memory barriers. This patch adds a "memory" clobber to the inline asm code in arch_local_irq_restore() which is used as the building block for other functions needing to set/clear the interrupt enable in the CSR register. Signed-off-by: Mark Salter <msalter@redhat.com>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/*
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* C6X IRQ flag handling
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*
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* Copyright (C) 2010 Texas Instruments Incorporated
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* Written by Mark Salter (msalter@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_IRQFLAGS_H
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#define _ASM_IRQFLAGS_H
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#ifndef __ASSEMBLY__
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/* read interrupt enabled status */
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static inline unsigned long arch_local_save_flags(void)
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{
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unsigned long flags;
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asm volatile (" mvc .s2 CSR,%0\n" : "=b"(flags));
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return flags;
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}
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/* set interrupt enabled status */
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static inline void arch_local_irq_restore(unsigned long flags)
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{
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asm volatile (" mvc .s2 %0,CSR\n" : : "b"(flags) : "memory");
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}
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/* unconditionally enable interrupts */
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static inline void arch_local_irq_enable(void)
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{
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unsigned long flags = arch_local_save_flags();
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flags |= 1;
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arch_local_irq_restore(flags);
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}
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/* unconditionally disable interrupts */
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static inline void arch_local_irq_disable(void)
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{
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unsigned long flags = arch_local_save_flags();
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flags &= ~1;
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arch_local_irq_restore(flags);
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}
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/* get status and disable interrupts */
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static inline unsigned long arch_local_irq_save(void)
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{
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unsigned long flags;
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flags = arch_local_save_flags();
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arch_local_irq_restore(flags & ~1);
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return flags;
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}
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/* test flags */
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static inline int arch_irqs_disabled_flags(unsigned long flags)
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{
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return (flags & 1) == 0;
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}
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/* test hardware interrupt enable bit */
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static inline int arch_irqs_disabled(void)
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{
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return arch_irqs_disabled_flags(arch_local_save_flags());
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_IRQFLAGS_H */
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