Changeset 200 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AccessDPT.asm

Timestamp:

Nov 22, 2011, 8:38:36 AM (12 years ago)

Author:

gregli@…

google:author:

gregli@hotmail.com

Message:

Added logic to skip scanning COM ports if a COM port was already found during the normal detection process, to avoid finding the same serial drive twice and preseting the OS with two drives which in reality point to the same physical file on the server. Also added logic to skip scanning for the slave serial drive if the master was not found. And various small optimizations.

File:

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

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AccessDPT.asm

@@ -124 +124 @@
 .ReturnPointerToDRVPARAMS:
     ret
+
+;--------------------------------------------------------------------
+; AccessDPT_GetUnshiftedAddressModeToALZF
+;   Parameters:
+;       DS:DI:  Ptr to Disk Parameter Table
+;   Returns:
+;       AL:     Addressing Mode (L-CHS, P-CHS, LBA28, LBA48) 
+;               unshifted (still shifted where it is in bFlagsLow)
+;       ZF:     Set based on value in AL
+;   Corrupts registers:
+;       AL
+;--------------------------------------------------------------------
+; 
+; Converted to a macro since only called in two places, and the call/ret overhead 
+; is not worth it for these two instructions (4 bytes total)
+;
+%macro AccessDPT_GetUnshiftedAddressModeToALZF 0
+    mov     al, [di+DPT.bFlagsLow]
+    and     al, MASKL_DPT_ADDRESSING_MODE
+%endmacro
+
+