Removed unused function and error message

arch/x86_64/start_32.S

@@ -22,9 +22,6 @@
 no_long_mode_err:
     .asciz "This system is not 64-bit. Press any key to reboot."
 
-unsupported_cpu_err:
-    .asciz "Your CPU is not supported by Magenta. Press any key to reboot."
-
 
 /*******
   LONG MDOE BOOSTRAP GDT
@@ -70,7 +67,8 @@ bootstrap_stack_top:
 .long FLAGS
 .long CHECKSUM
 
-# Print an error message and wait for RETURN if the system's CPU doesn't support long mode.
+# Print an error message, wait for RETURN, and
+# reboot if the system's CPU doesn't support long mode.
 no_long_mode:
 	# print error message
 	mov $no_long_mode_err, %esi
@@ -99,34 +97,6 @@ no_long_mode:
 	cli
 	hlt
 
-# Print an error message and wait for RETURN if the system's CPU isn't supported.
-unsupported_cpu:
-	# print error message
-	mov $unsupported_cpu_err, %esi
-
-	mov $0xb8000, %edi
-1:
-	movsb
-	movb $12, (%edi)
-	incl %edi
-	cmpb $0, (%esi)
-	jne 1b
-
-2:
-	inb $0x64, %al
-	test $0x01, %al
-	jz 3f
-	inb $0x60, %al
-	jmp 2b
-
-3:
-	inb $0x64, %al
-	test $0x01, %al
-	jz 3b
-
-	int $0xff
-	cli
-	hlt
 
 .global init_page_tables
 .type init_page_tables, @function