Added shutdown command

README.md

@@ -34,3 +34,8 @@ Graphics mode test: \
 ![Graphics Test](other/graphics.png)
 
 _These images may be outdated, Idk_
+
+## Known issues
+- If you run the kernel.bin, loading files sorta breaks, because the program is running at 0x8000, but it thinks that it's at 0x2000 (i think)
+- If you run anything in the code editor and return to the kernel, you won't be able to load any files
+- If you type only the starting letters of a command, it will still run (ie. 'he' will run help)

src/kernel.asm

@@ -68,6 +68,10 @@ runCommand:
     call .cmp
     je clearScreen
 
+    mov di, exitCmd
+    call .cmp
+    je shutdown
+
     jmp .end
 .cmp:
     push cx
@@ -221,6 +225,15 @@ clearScreen:
     call resetTextMode
     jmp input
 
+;
+; Shuts the system down
+; Only works for QEMU
+;
+shutdown:
+    mov ax, 0x2000
+    mov dx, 0x0604
+    out dx, ax
+
 ;
 ; File list (ls)
 ;
@@ -395,6 +408,7 @@ fileListMsg: db " Filename      E# St   Size ", ENDL, \
 helpMsg: db "Available Commands:", ENDL, \
             " clear  | Clears the screen", ENDL, \
             " edit   | Opens the code editor", ENDL, \
+            " exit   | Shuts the system down", ENDL, \
             " gfx    | Graphics mode test", ENDL, \
             " help   | Prints this message", ENDL, \
             " ls     | List all files", ENDL, \
@@ -406,6 +420,7 @@ clearCmd: db "clear", 0
 gfxCmd: db "gfx", 0
 helpCmd: db "help", 0
 lsCmd: db "ls", 0
+exitCmd: db "exit"
 rebootCmd: db "reboot", 0
 
 ; Files