io.c

#include "io.h"

// Writes to an io port
void outb(uint16_t port, uint8_t val) {
    asm volatile ("outb %0, %1"::"a" (val), "Nd"(port));
}

// Reads an io port and returns the result
uint8_t inb(uint16_t port) {
    uint8_t ret;
    asm volatile ("inb %1, %0":"=a" (ret):"Nd"(port));
    return ret;
}

////////////////////////////////////////////
// Enable/disable non-maskable interrupts //
////////////////////////////////////////////

void enable_nmi() {
    outb(0x70, inb(0x70) & 0x7f);
}

void disable_nmi() {
    outb(0x70, inb(0x70) & 0x80);
}