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