Changeset 117 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers

Timestamp:

Feb 28, 2011, 12:16:21 PM (14 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes to the XTIDE Universal BIOS:

• Bugfix: The stack swapping in BootVars_SwitchBackToPostStack wasn't really an atomic operation anymore (on 186 and 286 CPUs) so I reverted the change I did in the previous revision.
• A very small size optimization in AH15h_HSize.asm

Location:

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h

Files:

• AH15h_HSize.asm (modified) (3 diffs)
• Common/HCapacity.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm

@@ -1 @@
-; File name     :   AH15h_HSize.asm
-; Project name  :   IDE BIOS
-; Created date  :   28.9.2007
-; Last update   :   24.8.2010
-; Author        :   Tomi Tilli
+; Project name  :   XTIDE Universal BIOS
 ; Description   :   Int 13h function AH=15h, Read Disk Drive Size.
 
@@ -36 +32 @@
     push    ax
 
-    call    HCapacity_GetSectorCountFromOurAH08h; Sector count to DX:AX
+    call    HCapacity_GetSectorCountFromOurAH08h; Sector count to DX:AX (clears CF)
     mov     cx, dx                              ; HIWORD to CX
     xchg    dx, ax                              ; LOWORD to DX
@@ -43 +39 @@
     pop     bx
     mov     ah, 3                               ; Type code = Hard disk
-    clc
     jmp     Int13h_ReturnWithValueInDL

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Common/HCapacity.asm

@@ -41 +41 @@
     mul     bx              ; AX=Head count * Sectors per track
     mul     cx              ; DX:AX = Total sector count
-    xor     bx, bx          ; Zero BX for 48-bit sector count
+    xor     bx, bx          ; Zero BX for 48-bit sector count (and clear CF)
     ret