irqflags.h

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#pragma once
 
#include "proc_access.h"
#include "stddef.h"
#include "stdint.h"
 
inline static void irq_enable(uint8_t flags)
{
    if (flags) {
        sti();
    }
}
 
inline static uint8_t irq_disable(void)
{
    size_t flags;
    // We are pushing the entire contents of the EFLAGS register onto the stack,
    // clearing the interrupt line, and with the pop, getting the current status
    // of the flags.
    __asm__ __volatile__("pushf; cli; pop %0;"
                         : "=r"(flags)
                         :
                         : "memory");
    return flags & (1 << 9);
}
 
inline static uint8_t is_irq_enabled(void)
{
    size_t flags;
    __asm__ __volatile__("pushf; pop %0;"
                         : "=r"(flags)
                         :
                         : "memory");
    return flags & (1 << 9);
}