TempleOSCDV4.08.ISO

Adam/Opt/Boot/BootDVD.CPP

@@ -58,7 +58,7 @@ BDVD_NOT64_MSG:
 BDVD_BLK_LO::		DU16	0;
 BDVD_BLK_HI::		DU16	0;
 BDVD_BLK_CNT::		DU16	0;
-
+BDVD_SHIFT_BLKS::	DU16	0;
 BDVD_PROGRESS_STEP::	DU32	0;
 BDVD_PROGRESS_VAL::	DU32	0;
 
@@ -150,10 +150,35 @@ BDVD_MAIN::
 	POP	CX
 	LOOP	@@20
 
+//Shift backward to align
+	PUSH	DS
+	MOV	BX,U16 [BDVD_SHIFT_BLKS-BDVD_START]
+	SHL	BX,BLK_SIZE_BITS-4
+	MOV	CX,U16 [BDVD_BLK_CNT-BDVD_START]
+	MOV	AX,BOOT_RAM_BASE/16
+	MOV	ES,AX
+	ADD	AX,BX
+	MOV	DS,AX
+@@35:	PUSH	CX
+	XOR	SI,SI
+	XOR	DI,DI
+	MOV	CX,DVD_BLK_SIZE/4
+	REP_MOVSD
+	MOV	AX,DS
+	ADD	AX,DVD_BLK_SIZE/16
+	MOV	DS,AX
+	MOV	AX,ES
+	ADD	AX,DVD_BLK_SIZE/16
+	MOV	ES,AX
+	POP	CX
+	LOOP	@@35
+	POP	DS
+
 //See $LK,"BootDVDProve",A="MN:BootDVDProve"$().
-	MOV	EBX,U32 [BDVD_BLK_LO-BDVD_START] //TODO: oops overflow?
-	SHL	EBX,16
-	MOV	BX,BOOT_SRC_DVD  //$MA-X+PU,"See sys_boot_src",LM="Find(\"sys_boot_src\",\"/*\");View;\n"$
+	MOV	EBX,U32 [BDVD_BLK_LO-BDVD_START]
+	MOV	AX,U16 [BDVD_SHIFT_BLKS-BDVD_START]
+	SHL	EAX,16
+	MOV	AX,BOOT_SRC_DVD  //$MA-X+PU,"See sys_boot_src",LM="Find(\"sys_boot_src\",\"/*\");View;\n"$
 
 //My assembler doesn't support 16-bit very well.
 	DU8	0xEA;	//JMP BOOT_RAM_BASE:0000