From 4fe7733cadd5e8dbbaea719255a929e66124753f Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jackpot51@gmail.com>
Date: Wed, 7 Sep 2022 16:14:56 -0600
Subject: [PATCH] ided: Use pause instruction instead of yield_now when waiting
 for status

---
 ided/src/ide.rs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/ided/src/ide.rs b/ided/src/ide.rs
index f5e82589c2..73fbe20d3b 100644
--- a/ided/src/ide.rs
+++ b/ided/src/ide.rs
@@ -1,6 +1,5 @@
 use std::{
     sync::{Arc, Mutex},
-    thread,
 };
 use syscall::{
     error::{Error, Result, EIO},
@@ -9,6 +8,18 @@ use syscall::{
 
 use crate::ata::AtaCommand;
 
+#[cfg(target_arch = "aarch64")]
+#[inline(always)]
+pub(crate) unsafe fn pause() { std::arch::aarch64::__yield(); }
+
+#[cfg(target_arch = "x86")]
+#[inline(always)]
+pub(crate) unsafe fn pause() { std::arch::x86::_mm_pause(); }
+
+#[cfg(target_arch = "x86_64")]
+#[inline(always)]
+pub(crate) unsafe fn pause() { std::arch::x86_64::_mm_pause(); }
+
 pub struct Channel {
     pub data8: Pio<u8>,
     pub data32: Pio<u32>,
@@ -70,7 +81,7 @@ impl Channel {
         }
 
         while self.status.readf(0x80) {
-            thread::yield_now();
+            unsafe { pause(); }
         }
 
         if check {