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use core::arch::asm;
use core::marker::PhantomData;
use super::io::Io;
/// Generic PIO
#[derive(Copy, Clone)]
pub struct Pio<T> {
port: u16,
value: PhantomData<T>,
}
impl<T> Pio<T> {
/// Create a PIO from a given port
pub const fn new(port: u16) -> Self {
Pio::<T> {
port,
value: PhantomData,
}
}
}
/// Read/Write for byte PIO
impl Io for Pio<u8> {
type Value = u8;
/// Read
#[inline(always)]
fn read(&self) -> u8 {
let value: u8;
unsafe {
asm!("in al, dx", in("dx") self.port, out("al") value, options(nostack, nomem, preserves_flags));
}
value
}
/// Write
#[inline(always)]
fn write(&mut self, value: u8) {
unsafe {
asm!("out dx, al", in("dx") self.port, in("al") value, options(nostack, nomem, preserves_flags));
}
}
}
/// Read/Write for word PIO
impl Io for Pio<u16> {
type Value = u16;
/// Read
#[inline(always)]
fn read(&self) -> u16 {
let value: u16;
unsafe {
asm!("in ax, dx", in("dx") self.port, out("ax") value, options(nostack, nomem, preserves_flags));
}
value
}
/// Write
#[inline(always)]
fn write(&mut self, value: u16) {
unsafe {
asm!("out dx, ax", in("dx") self.port, in("ax") value, options(nostack, nomem, preserves_flags));
}
}
}
/// Read/Write for doubleword PIO
impl Io for Pio<u32> {
type Value = u32;
/// Read
#[inline(always)]
fn read(&self) -> u32 {
let value: u32;
unsafe {
asm!("in eax, dx", in("dx") self.port, out("eax") value, options(nostack, nomem, preserves_flags));
}
value
}
/// Write
#[inline(always)]
fn write(&mut self, value: u32) {
unsafe {
asm!("out dx, eax", in("dx") self.port, in("eax") value, options(nostack, nomem, preserves_flags));
}
}
}
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