From 243e1d84627c20a39f5464bb61cafae9fa2fe456 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Tue, 23 Apr 2019 03:45:55 +0200
Subject: Kernel: Use rep insw/outsw for IDE transfers.

There are much faster ways to do disk transfers, but I'm not implementing
those today. In the meantime, this is slightly nicer. :^)
---
 Kernel/IO.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'Kernel/IO.h')

diff --git a/Kernel/IO.h b/Kernel/IO.h
index cf99ca5ee6..5453b98494 100644
--- a/Kernel/IO.h
+++ b/Kernel/IO.h
@@ -25,6 +25,11 @@ inline dword in32(word port)
     return value;
 }
 
+inline void repeated_in16(word port, byte* buffer, int buffer_size)
+{
+    asm volatile("rep insw" : "+D"(buffer), "+c"(buffer_size) : "d"(port) : "memory");
+}
+
 inline void out8(word port, byte value)
 {
     asm volatile("outb %0, %1"::"a"(value), "Nd"(port));
@@ -39,4 +44,10 @@ inline void out32(word port, dword value)
 {
     asm volatile("outl %0, %1"::"a"(value), "Nd"(port));
 }
+
+inline void repeated_out16(word port, const byte* data, int data_size)
+{
+    asm volatile("rep outsw" : "+S"(data), "+c"(data_size) : "d"(port));
+}
+
 }
-- 
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