Created A20 line

nibblebits · Jul 30, 2020 · 197098f · 197098f
1 parent 46b01b6
commit 197098f
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Showing 5 changed files with 10 additions and 4 deletions.
diff --git a/Makefile b/Makefile
@@ -1,4 +1,5 @@
 all:
-	nasm -f bin ./boot.asm -o ./boot.bin
-	dd if=./message.txt >> ./boot.bin
-	dd if=/dev/zero bs=512 count=1 >> ./boot.bin
+	nasm -f bin ./src/boot/boot.asm -o ./bin/boot.bin
+
+clean:
+	rm -rf ./bin/boot.bin
diff --git a/bin/boot.bin b/bin/boot.bin
diff --git a/boot.bin b/boot.bin
diff --git a/message.txt b/message.txt
diff --git a/boot.asm → src/boot/boot.asm b/boot.asm → src/boot/boot.asm
@@ -70,6 +70,12 @@ load32:
     mov ss, ax
     mov ebp, 0x00200000
     mov esp, ebp
+
+    ; Enable the A20 line
+    in al, 0x92
+    or al, 2
+    out 0x92, al
+
     jmp $