diff --git a/build/iso/boot/grub/stage2_eltorito b/build/iso/boot/grub/stage2_eltorito
index 0fbaee7..9e1617c 100644
Binary files a/build/iso/boot/grub/stage2_eltorito and b/build/iso/boot/grub/stage2_eltorito differ
diff --git a/kernel/arch/x86/boot/boot.s b/kernel/arch/x86/boot/boot.s
index a43ce89..34931d3 100644
--- a/kernel/arch/x86/boot/boot.s
+++ b/kernel/arch/x86/boot/boot.s
@@ -59,8 +59,19 @@ _start:
 	mov esp, stack+STACK_SIZE
 
 	; pass multiboot information
-	push eax
 	push ebx
+	push eax
+
+	; enable SSE
+	mov ecx, cr0
+	btr ecx, 2	; clear CR0.EM bit
+	bts ecx, 1	; set CR0.MP bit
+	mov cr0, ecx
+
+	mov ecx, cr4
+	bts ecx, 9	; set CR4.OSFXSR bit
+	bts ecx, 10	; set CR4.OSXMMEXCPT bit
+	mov cr4, ecx
 
 	; call kmain
 	call kmain
diff --git a/kernel/core/util.d b/kernel/core/util.d
index 27b1faa..28d3f44 100644
--- a/kernel/core/util.d
+++ b/kernel/core/util.d
@@ -189,7 +189,7 @@ template isPointerType(T)
 
 template isPointerType(T : T*)
 {
-	const bool isPointerType = true;	
+	const bool isPointerType = true;
 }
 
 /**
@@ -363,7 +363,7 @@ char[] itoa(char[] buf, char base, long d)
 	if(base == 'd' && d < 0)
 	{
 		negative = true;
-		ud = -d;
+		ud = 0 - d;
 	}
 	else if(base == 'x')
 		divisor = 16;