From 52b42ec9750893349540256bdabdd09a6f975a6a Mon Sep 17 00:00:00 2001
From: Kieron Morris <kjm@kieronmorris.me>
Date: Sat, 3 Jul 2021 18:52:45 +0100
Subject: [PATCH] Enabled AVX + Changed flush to flush 2 pixels per iteration.

---
 src/cpu.pas                | 23 +++++++++++++++++++++++
 src/driver/video/video.pas | 10 +++++-----
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/src/cpu.pas b/src/cpu.pas
index 97f427a4..cc7d6db7 100644
--- a/src/cpu.pas
+++ b/src/cpu.pas
@@ -291,6 +291,28 @@ begin
     end;
 end;
 
+procedure enableAVX();
+begin
+    if CPUID.Capabilities1^.AVX then begin
+        asm
+            PUSH EAX
+            PUSH ECX
+            PUSH EDX
+            XOR ECX, ECX
+            db $0F
+            db $01
+            db $D0
+            OR EAX, 7
+            db $0F
+            db $01
+            db $D1
+            POP EDX
+            POP ECX
+            POP EAX
+        end;
+    end;
+end;
+
 procedure init();
 begin
     terminal.registerCommand('CPU', @Terminal_Command_CPU, 'CPU Info.');
@@ -300,6 +322,7 @@ begin
     getCPUCapabilities;
     getCPUClockSpeed;
     enableSSE;
+    enableAVX;
 end;
 
 end.
\ No newline at end of file
diff --git a/src/driver/video/video.pas b/src/driver/video/video.pas
index 505aac53..c53da7f6 100644
--- a/src/driver/video/video.pas
+++ b/src/driver/video/video.pas
@@ -125,14 +125,14 @@ end;
 procedure Flush();
 var
     x,y : uint32;
-    Back,Front : PuInt32;
+    Back,Front : PuInt64;
 
 begin
     if not(VESA.BackBuffer.Initialized) then exit;
-    Back:= PUint32(VESA.BackBuffer.Location);
-    Front:= PuInt32(VESA.Framebuffer.Location);
-    for x:=0 to VESA.Framebuffer.Width-1 do begin
-        for y:=0 to VESA.Framebuffer.Height-1 do begin
+    Back:= PUint64(VESA.BackBuffer.Location);
+    Front:= PuInt64(VESA.Framebuffer.Location);
+    for x:=0 to (VESA.Framebuffer.Width-1) div 2 do begin
+        for y:=0 to (VESA.Framebuffer.Height-1) div 2 do begin
             Front[(Y * VESA.Framebuffer.Width)+X]:= Back[(Y * VESA.Framebuffer.Width)+X];
         end;
     end;