#pragma once

// port listings
enum UART {
  COM1 = 0x3f8,
  COM2 = 0x2f8,
  COM3 = 0x3e8,
  COM4 = 0x2e8,
  COM5 = 0x5f8,
  COM6 = 0x4f8,
  COM7 = 0x5e8,
  COM8 = 0x4e8,
};
enum UARTPortOffset {
  Data = 0,             // read from receive buffer / write to transmit buffer | BaudDiv_l
  InterruptControl = 1, // interrupt enable | BaudDiv_h
  FifoControl = 2,      // interrupt ID and FIFO control
  LineControl = 3,      // most significant bit is the DLAB
  ModemControl = 4,
  LineStatus = 5,
  ModemStatus = 6,
  Scratch = 7,
};

static inline void
outb(unsigned char val, unsigned short port)
{
  asm volatile("outb %0,%1" : : "a"(val), "dN"(port));
}

static inline void
outw(unsigned short val, unsigned short port)
{
  asm volatile("outw %0,%1" : : "a"(val), "dN"(port));
}

static inline void
outl(unsigned int val, unsigned short port)
{
  asm volatile("outl %0,%1" : : "a"(val), "dN"(port));
}

static inline unsigned char
inb(unsigned short port)
{
  unsigned char val;
  asm volatile("inb %1,%0" : "=a"(val) : "dN"(port));
  return val;
}

static inline unsigned short
inw(unsigned short port)
{
  unsigned short val;
  asm volatile("inw %1,%0" : "=a"(val) : "dN"(port));
  return val;
}

static inline unsigned int
inl(unsigned short port)
{
  unsigned int val;
  asm volatile("inl %1,%0" : "=a"(val) : "dN"(port));
  return val;
}

static inline void
outsb(unsigned short port, const void *__buf, unsigned long __n)
{
  asm volatile("cld; rep; outsb" : "+S"(__buf), "+c"(__n) : "d"(port));
}

static inline void
outsw(unsigned short port, const void *__buf, unsigned long __n)
{
  asm volatile("cld; rep; outsw" : "+S"(__buf), "+c"(__n) : "d"(port));
}

static inline void
outsl(unsigned short port, const void *__buf, unsigned long __n)
{
  asm volatile("cld; rep; outsl" : "+S"(__buf), "+c"(__n) : "d"(port));
}

static inline void
insb(unsigned short port, void *__buf, unsigned long __n)
{
  asm volatile("cld; rep; insb" : "+D"(__buf), "+c"(__n) : "d"(port));
}

static inline void
insw(unsigned short port, void *__buf, unsigned long __n)
{
  asm volatile("cld; rep; insw" : "+D"(__buf), "+c"(__n) : "d"(port));
}

static inline void
insl(unsigned short port, void *__buf, unsigned long __n)
{
  asm volatile("cld; rep; insl" : "+D"(__buf), "+c"(__n) : "d"(port));
}