Merge remote-tracking branch 'origin/5.0' into bootmanager-vender

[bootmanager.git] / dummy_bootloader / dummy_bootloader.S

diff --git a/dummy_bootloader/dummy_bootloader.S b/dummy_bootloader/dummy_bootloader.S
new file mode 100644 (file)
index 0000000..c8f1512
--- /dev/null
+++ b/dummy_bootloader/dummy_bootloader.S
@@ -0,0 +1,44 @@
+SCREEN_COLS     equ 80
+SCREEN_ROWS     equ 25
+STACK_SEGMENT   equ 09000h     ; top of memory
+STACK_SIZE      equ 00fffh     ; 4K - 1 bytes of stack
+       
+TEXT_COLOR     equ 0x07        ; white on black
+
+       jmp 07c0h:start
+
+message                db "PlanetLab nodes require a boot cd at all times to function.",0
+       
+start:
+       mov ax, cs
+       mov ds, ax
+       mov es, ax
+       
+       mov sp, STACK_SEGMENT   ; setup stack (not really used)
+       mov ss, sp
+       mov sp, STACK_SIZE
+
+       ;; clear out the screen, using the scroll down bios int.
+       mov ah, 0x07            ; for int 0x10, 0x07 is scroll down window
+       mov al, 0               ; entire window
+       mov cx, 0               ; upper left corner = (0,0)
+       mov dh, SCREEN_ROWS     ; row of bottom
+       mov dl, SCREEN_COLS     ; column of right
+       mov bh, 7
+       int 10h                 
+       
+       mov si, message
+
+strout: lodsb
+       cmp al, 0
+       je done
+       mov ah, 0x0E            ; for int 0x10, 0xOE is char out
+       mov bx, TEXT_COLOR
+       int 0x10
+       jmp strout
+
+done:  
+       jmp done
+       
+       times 510 - ($ - $$) db 0 ;  last two bytes are magic for x86 boot sectors
+       dw 0aa55h