Changeset 86

Timestamp:

Apr 8, 2017, 12:26:22 AM (8 years ago)

Author:

Ben Rietbroek

Message:

Added preliminary code for debug video page, hotkey 'd' [v1.1.1-testing]

Like the TAB-key switches between BIOS-post info and MENU, this toggles
the display of debug output to the screen. This uses video page 3.
No functionality is implemented yet.

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/regular/debug.asm (modified) (3 diffs)

trunk/bootcode/regular/debug.asm

@@ -96 +96 @@
         db      't'
         dw      offset  DEBUG_Test
+        db      'd'
+        dw      offset  DEBUG_DebugScreenToggle
         db      'l'
         dw      offset  DEBUG_DumpDriveLetters
@@ -325 +327 @@
 
 ;
+; Toggle display of debug video page.
+;
+IF  0
+DEBUG_DebugScreenToggle Proc
+        pushf
+        pusha
+
+        mov     si, offset $+5
+        jmp     @F
+        db      10,'DebugScreenToggle:',10,0
+prvpg   db      00h
+hdr     db      10,'[Debug Console]',13,10,0
+@@:     call    AuxIO_Print
+
+        ; Get current page in BH
+        mov     ah, 0fh
+        int     10h
+
+        ; Already debug page ?
+        cmp     bh, 03h
+        je      DEBUG_DebugScreenToggle_back
+
+        ; Remember page
+        mov     [prvpg], bh
+
+        ; Switch to debug page
+        mov     al, 03h
+        mov     ah, 05h
+        int     10h
+
+        ; Get cursor position in DX (DH=row, DL=column)
+        ;~ mov     ah, 03h
+        ;~ mov     bh, 03h
+        ;~ int     10h
+
+        ;~ mov     al, 01h
+        ;~ mov     bh, 03h
+        ;~ mov     bl, 07h
+        ;~ mov     bp, offset [hdr]
+        ;~ mov     cx, sizeof(hdr)
+        ;~ mov     ah, 13h
+        ;~ int     10h
+
+        ;~ mov     bh, 03h
+        ;~ mov     dh, 00h
+        ;~ mov     dl, 00h
+        ;~ mov     ah, 02h
+        ;~ int     10h
+
+        mov     si, offset [hdr]
+        call    DBG_Teletype
+
+        jmp     DEBUG_DebugScreenToggle_end
+
+    DEBUG_DebugScreenToggle_back:
+        ; Switch back to previous page
+        mov     al, [prvpg]
+        mov     ah, 05h
+        int     10h
+        jmp     DEBUG_DebugScreenToggle_end
+
+    DEBUG_DebugScreenToggle_end:
+        popa
+        popf
+        ret
+DEBUG_DebugScreenToggle EndP
+ELSE
+DEBUG_DebugScreenToggle Proc
+        ret
+DEBUG_DebugScreenToggle EndP
+ENDIF
+
+
+
+;
 ; Dump the geometry.
 ;
@@ -1005 +1082 @@
 
 ;
+; Like the MBR version, but uses video page 3
+;
+DBG_Teletype    Proc Near   Uses ax bx cx
+        mov     ah, 0Eh
+        mov     bh, 03h
+        mov     bl, 07h
+    DBGT_Loop:
+        lodsb
+        or      al, al
+        jz      DBGT_End
+        int     10h
+        jmp     DBGT_Loop
+    DBGT_End:
+        ret
+DBG_Teletype    EndP
+
+
+
+;
 ; These strings can also be referenced outside the debug module when debugging
 ; is enabled.