Changeset 79

Timestamp:

Apr 8, 2017, 12:26:17 AM (8 years ago)

Author:

Ben Rietbroek

Message:

Corrected AirBoot reset functionality (debugging) [v1.1.1-testing]

CAUTION:
This is a testbuild !
AirBoot uses the BIOS to access disks and a small coding error can trash
partition tables or other vital disk structures. You are advised to make
backups of TRACK0 and EBRs before using this testbuild. More info at:
​https://rousseaux.github.io/netlabs.air-boot/pdf/AirBoot-v1.1.0-manual.pdf

File:

• trunk/bootcode/airboot.asm (modified) (1 diff)

trunk/bootcode/airboot.asm

@@ -1462 +1462 @@
 ; BOOKMARK: AiR-BOOT Restart (used for debugging)
 AirbootRestart:
-        mov     bx, [OldSP]     ; Old SP when BIOS transferred control to AB
-        mov     dx, [OldSS]     ; Old SS when BIOS transferred control to AB
+        mov     bx, [OldSP]             ; Old SP when BIOS transferred control to AB
+        mov     cx, [OldSS]             ; Old SS when BIOS transferred control to AB
+        xor     dh, dh                  ; Head 0
+        mov     dl, [BIOS_BootDisk]     ; Disk AirBoot was loaded from
         jmp     MBR_RealStart