| 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)); |
| } |
| } |
| } |