Changeset 491 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AtaGeometry.asm

Timestamp:

Dec 15, 2012, 2:46:29 PM (11 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes:

• Added a new define (USE_UNDOC_INTEL) that enables optimizations possible by using undocumented instructions available on all Intel processors and truly compatible clones. AFAIK the only exceptions are the NEC V-series and the Sony CXQ70108 processors so this option should be safe for use on the AT builds.
• Building BIOSDRVS or the BIOS without MODULE_STRINGS_COMPRESSED would fail due to the recent code exclusions so I changed them a bit. Also fixed the mistaken change to Main.asm
• Changed the Tandy specific info in Configuration_FullMode.txt so it matches the info in the Wiki.
• Optimizations and fixes in general.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AtaGeometry.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AtaGeometry.asm

@@ -81 +81 @@
 AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIandTranslateModeInDX:
     call    AtaGeometry_GetPCHStoAXBLBHfromAtaInfoInESSI
-    ; Fall to AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBH
+    ; Fall to AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBHandTranslateModeInDX
 
 AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBHandTranslateModeInDX:
     ; Check if user defined translate mode
-    test    dx, dx
-    jnz     SHORT .CheckIfLargeTranslationWanted
+    dec     dx                      ; Set ZF if TRANSLATEMODE_LARGE, SF if TRANSLATEMODE_NORMAL
+    jns     SHORT .CheckIfLargeTranslationWanted
     MIN_U   ax, MAX_LCHS_CYLINDERS  ; TRANSLATEMODE_NORMAL maximum cylinders
     inc     dx
 .CheckIfLargeTranslationWanted:
-    dec     dx                      ; Set ZF if TRANSLATEMODE_LARGE
     jz      SHORT ConvertPCHfromAXBLtoRevisedEnhancedCHinAXBL
     dec     dx                      ; Set ZF if TRANSLATEMODE_ASSISTED_LBA