158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
/* FR-V interrupt handling
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*
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* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@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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/*
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* interrupt flag manipulation
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* - use virtual interrupt management since touching the PSR is slow
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* - ICC2.Z: T if interrupts virtually disabled
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* - ICC2.C: F if interrupts really disabled
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* - if Z==1 upon interrupt:
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* - C is set to 0
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* - interrupts are really disabled
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* - entry.S returns immediately
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* - uses TIHI (TRAP if Z==0 && C==0) #2 to really reenable interrupts
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* - if taken, the trap:
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* - sets ICC2.C
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* - enables interrupts
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*/
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static inline void arch_local_irq_disable(void)
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{
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/* set Z flag, but don't change the C flag */
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asm volatile(" andcc gr0,gr0,gr0,icc2 \n"
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:
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:
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: "memory", "icc2"
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);
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}
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static inline void arch_local_irq_enable(void)
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{
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/* clear Z flag and then test the C flag */
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asm volatile(" oricc gr0,#1,gr0,icc2 \n"
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" tihi icc2,gr0,#2 \n"
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:
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:
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: "memory", "icc2"
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);
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}
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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("movsg ccr,%0"
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: "=r"(flags)
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:
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: "memory");
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/* shift ICC2.Z to bit 0 */
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flags >>= 26;
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/* make flags 1 if interrupts disabled, 0 otherwise */
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return flags & 1UL;
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}
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static inline unsigned long arch_local_irq_save(void)
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{
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unsigned long flags = arch_local_save_flags();
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arch_local_irq_disable();
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return flags;
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}
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static inline void arch_local_irq_restore(unsigned long flags)
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{
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/* load the Z flag by turning 1 if disabled into 0 if disabled
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* and thus setting the Z flag but not the C flag */
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asm volatile(" xoricc %0,#1,gr0,icc2 \n"
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/* then trap if Z=0 and C=0 */
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" tihi icc2,gr0,#2 \n"
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:
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: "r"(flags)
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: "memory", "icc2"
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);
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}
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static inline bool arch_irqs_disabled_flags(unsigned long flags)
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{
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return flags;
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}
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static inline bool 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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/*
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* real interrupt flag manipulation
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*/
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#define __arch_local_irq_disable() \
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do { \
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unsigned long psr; \
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asm volatile(" movsg psr,%0 \n" \
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" andi %0,%2,%0 \n" \
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" ori %0,%1,%0 \n" \
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" movgs %0,psr \n" \
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: "=r"(psr) \
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: "i" (PSR_PIL_14), "i" (~PSR_PIL) \
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: "memory"); \
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} while (0)
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#define __arch_local_irq_enable() \
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do { \
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unsigned long psr; \
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asm volatile(" movsg psr,%0 \n" \
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" andi %0,%1,%0 \n" \
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" movgs %0,psr \n" \
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: "=r"(psr) \
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: "i" (~PSR_PIL) \
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: "memory"); \
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} while (0)
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#define __arch_local_save_flags(flags) \
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do { \
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typecheck(unsigned long, flags); \
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asm("movsg psr,%0" \
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: "=r"(flags) \
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: \
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: "memory"); \
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} while (0)
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#define __arch_local_irq_save(flags) \
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do { \
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unsigned long npsr; \
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typecheck(unsigned long, flags); \
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asm volatile(" movsg psr,%0 \n" \
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" andi %0,%3,%1 \n" \
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" ori %1,%2,%1 \n" \
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" movgs %1,psr \n" \
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: "=r"(flags), "=r"(npsr) \
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: "i" (PSR_PIL_14), "i" (~PSR_PIL) \
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: "memory"); \
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} while (0)
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#define __arch_local_irq_restore(flags) \
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do { \
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typecheck(unsigned long, flags); \
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asm volatile(" movgs %0,psr \n" \
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: \
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: "r" (flags) \
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: "memory"); \
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} while (0)
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#define __arch_irqs_disabled() \
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((__get_PSR() & PSR_PIL) >= PSR_PIL_14)
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#endif /* _ASM_IRQFLAGS_H */
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