#include <stdint.h>
#include <kernel/system.h>

uint8_t inb(uint16_t port)
{
	uint8_t value;
	asm("inb %1, %0" : "=a"(value) : "Nd"(port));
	return value;
}

uint16_t inw(uint16_t port)
{
	uint16_t value;
	asm("inw %1, %0" : "=a"(value) : "Nd"(port));
	return value;
}

uint32_t inl(uint16_t port)
{
	uint32_t value;
	asm("inl %1, %0" : "=a"(value) : "Nd"(port));
	return value;
}

void cli()
{
	asm volatile("cli");
}

void sti()
{
	asm volatile("sti");
}

void hlt()
{
	asm volatile("hlt");
}

void outb(uint16_t port, uint8_t data)
{
	asm("outb %0, %1" ::"a"(data), "Nd"(port));
}

void outw(uint16_t port, uint16_t data)
{
	asm("outw %0, %1" ::"a"(data), "Nd"(port));
}

void outl(uint16_t port, uint32_t data)
{
	asm("outl %0, %1" ::"a"(data), "Nd"(port));
}

void init_serial()
{
	outb(0x3f8 + 1, 0x00);
	outb(0x3f8 + 3, 0x80);
	outb(0x3f8 + 0, 0x03);
	outb(0x3f8 + 1, 0x00);
	outb(0x3f8 + 3, 0x03);
	outb(0x3f8 + 2, 0xC7);
	outb(0x3f8 + 4, 0x0B);
	vga_log("Installed serial connection");
}

int is_transmit_empty()
{
	return inb(0x3f8 + 5) & 0x20;
}

void serial_put(char ch)
{
	while (is_transmit_empty() == 0)
		;
	outb(0x3f8, (uint8_t)ch);
}