Changeset 157 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src

Timestamp:

May 1, 2011, 8:34:29 PM (13 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to the XTIDE Universal BIOS:

• Size optimizations in IdeTransfer.asm and IdeCommand.asm (saved 12 bytes).

Location:

trunk/XTIDE_Universal_BIOS/Src

Files:

• Device/IDE/IdeCommand.asm (modified) (1 diff)
• Device/IDE/IdeTransfer.asm (modified) (1 diff)
• Handlers/Int13h/AH9h_HInit.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeCommand.asm

@@ -82 +82 @@
 
     ; Clean stack and return
-    rcl     al, 1       ; Store CF
-    add     sp, BYTE SIZE_OF_FAKE_IDEPACK
-    rcr     al, 1       ; Restore CF
+    lea     sp, [bp+SIZE_OF_FAKE_IDEPACK]   ; This assumes BP hasn't changed between Idepack_FakeToSSBP and here
     pop     bp
     ret

trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeTransfer.asm

@@ -34 +34 @@
     mov     ah, [bp+IDEPACK.bSectorCountHighExt]
 
-    ; Are we reading or writing
+    ; Are we reading or writing?
+    test    al, 16  ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
+    jnz     SHORT .PrepareToWriteDataFromESSI
     cmp     al, COMMAND_WRITE_MULTIPLE
-    je      SHORT .PrepareToWriteDataFromESSI
-    cmp     al, COMMAND_WRITE_MULTIPLE_EXT
-    je      SHORT .PrepareToWriteDataFromESSI
-    cmp     al, COMMAND_WRITE_SECTORS
-    je      SHORT .PrepareToWriteDataFromESSI
-    cmp     al, COMMAND_WRITE_SECTORS_EXT
     je      SHORT .PrepareToWriteDataFromESSI
 

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm

@@ -93 +93 @@
     jnz     SHORT ReturnSuccessSinceInitializationNotNeeded
 
-    ; Initialize Locigal Sectors per Track and Max Head number
+    ; Initialize Logical Sectors per Track and Max Head number
     mov     ah, [di+DPT.bPchsHeads]
     dec     ah                          ; Max Head number