Changeset 181 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

Timestamp:

Nov 13, 2011, 3:38:40 PM (12 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to all parts of the project:

• Size optimizations.
• Added a define (EXCLUDE_FROM_XTIDECFG) to exclude unused library code from XTIDECFG.
• Tried to minimize time spent with interrupts disabled.
• Some minor attempts to improve speed (reordering instructions etc).
• Tried to improve readability, did some cleanup and fixed some errors in comments.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

@@ -66 +66 @@
 %ifdef MODULE_SERIAL
     cmp     byte [cs:bp+IDEVARS.bDevice], DEVICE_SERIAL_PORT
-    jnz     .around
+    jnz     .StoreAddressing
     or      byte [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE
-.around:                
-%endif      
-
+%endif
     ; Fall to .StoreAddressing
 
@@ -117 +115 @@
 
     ; We need to get number of bits to shift for translation
-    push    bx
     push    ax
     eMOVZX  dx, bl                      ; Heads now in DX
-    xchg    bx, ax                      ; Sectors now in BX
-    call    AccessDPT_ShiftPCHinBXDXtoLCH
+    xchg    bx, ax                      ; Cylinders now in BX
+    call    AccessDPT_ShiftPCHinBXDXtoLCH   ; Leaves AX untouched
+    xchg    bx, ax                      ; Restore HeadsAndSectors to BX
     or      cl, ADDRESSING_MODE_PCHS<<ADDRESSING_MODE_FIELD_POSITION
     or      [di+DPT.bFlagsLow], cl      ; Store bits to shift
     pop     ax
-    pop     bx
     ; Fall to .StoreChsFromAXBX