From 5d29745034c854886fb5988fca65cc3757f69a3e Mon Sep 17 00:00:00 2001
From: Jake Mannens <jakem_5@hotmail.com>
Date: Sun, 2 Aug 2020 08:27:25 +1000
Subject: Modified assembly routines to use x86's advanced addressing modes.

---
 kernel/asm.s | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

(limited to 'kernel/asm.s')

diff --git a/kernel/asm.s b/kernel/asm.s
index 4e1e376..32153e4 100644
--- a/kernel/asm.s
+++ b/kernel/asm.s
@@ -70,8 +70,7 @@ set_tss:
   push ebx
   mov eax, [ebp+12]
   mov ebx, [ebp+8]
-  shl ebx, 3
-  add ebx, gdt+40
+  lea ebx, [ebx*8+gdt+40]
   mov [ebx+2], ax
   shr eax, 16
   mov [ebx+4], al
@@ -92,9 +91,7 @@ clear_tss:
   mov ebp, esp
   push ebx
   mov ebx, [ebp+8]
-  shl ebx, 3
-  add ebx, gdt+40
-  mov byte [ebx+5], 0
+  mov byte [ebx*8+gdt+40+5], 0
   pop ebx
   pop ebp
   ret
-- 
cgit v1.3