/* SPDX-License-Identifier: GPL-2.0 */
/*
 * include/asm/irqflags.h
 *
 * IRQ flags handling
 *
 * This file gets included from lowlevel asm headers too, to provide
 * wrapped versions of the local_irq_*() APIs, based on the
 * arch_local_irq_*() functions from the lowlevel headers.
 */
#ifndef _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H

#include <asm/pil.h>

#ifndef __ASSEMBLER__

static inline notrace unsigned long arch_local_save_flags(void)
{
        unsigned long flags;

        __asm__ __volatile__(
                "rdpr   %%pil, %0"
                : "=r" (flags)
        );

        return flags;
}

static inline notrace void arch_local_irq_restore(unsigned long flags)
{
        __asm__ __volatile__(
                "wrpr   %0, %%pil"
                : /* no output */
                : "r" (flags)
                : "memory"
        );
}

static inline notrace void arch_local_irq_disable(void)
{
        __asm__ __volatile__(
                "wrpr   %0, %%pil"
                : /* no outputs */
                : "i" (PIL_NORMAL_MAX)
                : "memory"
        );
}

static inline notrace void arch_local_irq_enable(void)
{
        __asm__ __volatile__(
                "wrpr   0, %%pil"
                : /* no outputs */
                : /* no inputs */
                : "memory"
        );
}

static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
{
        return (flags > 0);
}

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

static inline notrace unsigned long arch_local_irq_save(void)
{
        unsigned long flags, tmp;

        /* Disable interrupts to PIL_NORMAL_MAX unless we already
         * are using PIL_NMI, in which case PIL_NMI is retained.
         *
         * The only values we ever program into the %pil are 0,
         * PIL_NORMAL_MAX and PIL_NMI.
         *
         * Since PIL_NMI is the largest %pil value and all bits are
         * set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
         * actually is.
         */
        __asm__ __volatile__(
                "rdpr   %%pil, %0\n\t"
                "or     %0, %2, %1\n\t"
                "wrpr   %1, 0x0, %%pil"
                : "=r" (flags), "=r" (tmp)
                : "i" (PIL_NORMAL_MAX)
                : "memory"
        );

        return flags;
}

#endif /* (__ASSEMBLER__) */

#endif /* !(_ASM_IRQFLAGS_H) */