// PC console
#include <u.h>
#include "dat.h"
#include "fn.h"

// https://stanislavs.org/helppc/int_16.html
int
pcprobe(ConDev *d)
{
	d->pri = 2;
	d->dev = makedev(12, 0);
	print("PC:%d\n", minor(d->dev));
	return 1;
}

void
pcinit(ConDev *d)
{
	USED(d);	
}

void
pcputc(int dev, int c)
{
	__asm volatile("int $0x30" : : "a" (c | 0xe00), "b" (1) : "%ecx", "%edx", "cc" );
}

int
pcgetc(int dev)
{
	register int rv;

	// wait for available
	do{
		__asm volatile("int $0x36; setnz %b0" : "=a" (rv) :
		    "0" (0x100) : "%ecx", "%edx", "cc" );
	}while((rv & 0xff) == 0);

	__asm volatile("int $0x36" : "=a" (rv) :
	    "0" (0x000) : "%ecx", "%edx", "cc" );
	return rv&0xff;
}