Finished implementing paging init and long mode switch

arch/x86_64/start_64.S

@@ -1,10 +1,57 @@
+.code64
+
+.section .boot.rodata, "a", @progbits
+
+/*******
+  ERROR MESSAGE STRINGS
+ *******/
+kernel_identifier:
+    .asciz "    Socks kernel version " BUILD_ID "    "
+
+
 .section .boot.text, "ax", @progbits
 
-.code64
+print_kernel_identifier:
+	/* line 1: empty padding line */
+	mov $kernel_identifier, %rsi
+	mov $0xb8000, %rdi
+
+1:
+	movw $0x7000, (%rdi)		# black text on white background.
+	add $0x02, %rdi
+	inc %rsi
+	cmpb $0, (%rsi)
+	jne 1b
+
+	/* line 2: kernel identiifer */
+	mov $kernel_identifier, %rsi
+	mov $0xb80A0, %rdi
+
+2:
+	movsb
+	movb $0x70, (%rdi)			# black text on white background
+	inc %rdi
+	cmpb $0, (%rsi)
+	jne 2b
+
+
+	/* line 3: empty padding line */
+	mov $kernel_identifier, %rsi
+	mov $0xb8140, %rdi
+
+1:
+	movw $0x7000, (%rdi)		# black text on white background.
+	add $0x02, %rdi
+	inc %rsi
+	cmpb $0, (%rsi)
+	jne 1b
+	ret
+
+
 .global start_64
 .type start_64, @function
 start_64:
-	mov $0xb8000, %rax
-	movb $77, (%rax)
-	inc %rax
-	movb $0xF, (%rax)
+	call print_kernel_identifier
+
+	cli
+	hlt