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/*
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef _ASM_MICROBLAZE_IRQFLAGS_H
#define _ASM_MICROBLAZE_IRQFLAGS_H
#include <linux/types.h>
#include <asm/registers.h>
#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
static inline unsigned long arch_local_irq_save(void)
{
unsigned long flags;
asm volatile(" msrclr %0, %1 \n"
" nop \n"
: "=r"(flags)
: "i"(MSR_IE)
: "memory");
return flags;
}
static inline void arch_local_irq_disable(void)
{
/* this uses r0 without declaring it - is that correct? */
asm volatile(" msrclr r0, %0 \n"
" nop \n"
:
: "i"(MSR_IE)
: "memory");
}
static inline void arch_local_irq_enable(void)
{
/* this uses r0 without declaring it - is that correct? */
asm volatile(" msrset r0, %0 \n"
" nop \n"
:
: "i"(MSR_IE)
: "memory");
}
#else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
static inline unsigned long arch_local_irq_save(void)
{
unsigned long flags, tmp;
asm volatile (" mfs %0, rmsr \n"
" nop \n"
" andi %1, %0, %2 \n"
" mts rmsr, %1 \n"
" nop \n"
: "=r"(flags), "=r"(tmp)
: "i"(~MSR_IE)
: "memory");
return flags;
}
static inline void arch_local_irq_disable(void)
{
unsigned long tmp;
asm volatile(" mfs %0, rmsr \n"
" nop \n"
" andi %0, %0, %1 \n"
" mts rmsr, %0 \n"
" nop \n"
: "=r"(tmp)
: "i"(~MSR_IE)
: "memory");
}
static inline void arch_local_irq_enable(void)
{
unsigned long tmp;
asm volatile(" mfs %0, rmsr \n"
" nop \n"
" ori %0, %0, %1 \n"
" mts rmsr, %0 \n"
" nop \n"
: "=r"(tmp)
: "i"(MSR_IE)
: "memory");
}
#endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
static inline unsigned long arch_local_save_flags(void)
{
unsigned long flags;
asm volatile(" mfs %0, rmsr \n"
" nop \n"
: "=r"(flags)
:
: "memory");
return flags;
}
static inline void arch_local_irq_restore(unsigned long flags)
{
asm volatile(" mts rmsr, %0 \n"
" nop \n"
:
: "r"(flags)
: "memory");
}
static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
return (flags & MSR_IE) == 0;
}
static inline bool arch_irqs_disabled(void)
{
return arch_irqs_disabled_flags(arch_local_save_flags());
}
#endif /* _ASM_MICROBLAZE_IRQFLAGS_H */
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