From 48f00ba3b135d83023725fb591f02100a0c7ac08 Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Wed, 14 Dec 2022 18:41:41 +0000
Subject: [PATCH] Optimised start_64 vga_clear()

---
 arch/x86_64/start_64.S | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86_64/start_64.S b/arch/x86_64/start_64.S
index 1efbcc4..d0bd140 100644
--- a/arch/x86_64/start_64.S
+++ b/arch/x86_64/start_64.S
@@ -12,11 +12,11 @@ kernel_identifier:
 .section .boot.text, "ax", @progbits
 
 vga_clear:
-	mov $0xb8000, %edi		# VGA buffer
-	mov $0xFA0, %ecx		# 4,000 bytes to clear
-	mov $0x0, %eax
+	mov $0xb8000, %rdi		# VGA buffer
+	mov $500, %rcx			# 4,000 bytes to clear = 500 quadwords
+	mov $0x0, %rax
 
-	rep stosb
+	rep stosq
 
 	ret