Optimised start_64 vga_clear()

2022-12-14 18:41:41 +00:00
parent a5c6240761
commit 48f00ba3b1
1 changed files with 4 additions and 4 deletions
--- 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