loader: manually enable a20 if 0x2401 fails

rouseabout · Jan 15, 2025 · 36fa4d9 · 36fa4d9
1 parent 77ca14b
commit 36fa4d9
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/loader/loader.asm b/loader/loader.asm
@@ -14,11 +14,16 @@ start:
     mov ss, ax
     mov sp, 0x7c00
 
-%if 0
     mov ax, 0x2401
     int 0x15
-%endif
+    jnc .continue
+
+    cli
+    mov al, 2
+    out 0x92, al
+    sti
 
+.continue:
     mov si, zsetup
     call printz