irqflags.h

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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 notrace 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 notrace 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 notrace 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 notrace 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 notrace 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 notrace 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 notrace 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 notrace void arch_local_irq_restore(unsigned long flags)
{
    asm volatile("  mts rmsr, %0    \n"
             "  nop         \n"
             :
             : "r"(flags)
             : "memory");
}

static inline notrace bool arch_irqs_disabled_flags(unsigned long flags)
{
    return (flags & MSR_IE) == 0;
}

static inline notrace bool arch_irqs_disabled(void)
{
    return arch_irqs_disabled_flags(arch_local_save_flags());
}

#endif /* _ASM_MICROBLAZE_IRQFLAGS_H */