Changeset 181 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Initialization/AtaID.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/Initialization/AtaID.asm (modified) (4 diffs)

trunk/XTIDE_Universal_BIOS/Src/Initialization/AtaID.asm

@@ -121 +121 @@
 ;--------------------------------------------------------------------
 AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI:
-    call    Registers_ExchangeDSSIwithESDI  ; ATA info now in DSDI
+    mov     bx, Registers_ExchangeDSSIwithESDI
+    call    bx  ; ATA info now in DS:DI
+    push    bx  ; We will return via Registers_ExchangeDSSIwithESDI
     xor     bx, bx
     test    BYTE [di+ATA1.wCaps+1], A1_wCaps_LBA>>8
@@ -133 +135 @@
 ;   Parameters:
 ;       BX:     Zero
-;       DS:SI:  Ptr to 512-byte ATA information read from the drive
+;       DS:DI:  Ptr to 512-byte ATA information read from the drive
 ;   Returns:
 ;       BX:DX:AX:   48-bit sector count
@@ -145 +147 @@
     mov     dx, [di+ATA6.qwLBACnt+2]
     mov     bx, [di+ATA6.qwLBACnt+4]
-    jmp     SHORT .ExchangePtrAndReturn
+    ret
 
 .GetLba28SectorCount:
     mov     ax, [di+ATA1.dwLBACnt]
     mov     dx, [di+ATA1.dwLBACnt+2]
-    jmp     SHORT .ExchangePtrAndReturn
+    ret
 
 .GetChsSectorCount:
@@ -156 +158 @@
     mul     BYTE [di+ATA1.wHeadCnt] ; AX=Sectors per track * number of heads
     mul     WORD [di+ATA1.wCylCnt]  ; DX:AX=Sectors per track * number of heads * number of cylinders
-.ExchangePtrAndReturn:
-    jmp     Registers_ExchangeDSSIwithESDI
+    ret