SparrowOSTS_121127.ISO

2018-09-08 21:45:28 +02:00
1 parent 0e9364ff4c
commit e57428affb
@@ -0,0 +1,92 @@
+asm {
+#define MODULE_SIZE		1*BLK_SIZE
+#define BOOT_HIGH_LOC	((BOOT_RAM_LIMIT-(BOOT_STK_SIZE+MODULE_SIZE))>>4)
+
+USE16
+BHD_START::
+	DU8	0x5A DUP(0); //See $LK,"CFAT32Boot","MN:CFAT32Boot"$.code[]
+BHD_CODE::
+	CLD
+
+	MOV	AX,VGA_TEXT_MEM_BASE/16
+	MOV	FS,AX
+	MOV	U32 FS:[4],0
+	MOV	U32 FS:[0],'B'+0x2000+('3'+0x2000)<<16
+
+	MOV	AX,BOOT_HIGH_LOC
+	MOV	ES,AX
+
+	CLI
+	MOV	SS,AX
+	MOV	SP,BOOT_STK_SIZE+MODULE_SIZE
+	STI
+
+	CALL	BHD_GET_IP
+BHD_GET_IP:
+	POP	BX
+	SUB	BX,BHD_GET_IP-BHD_START
+	SHR	BX,4
+//Copy this bootloader code to just under 0x80000
+	MOV	AX,CS
+	ADD	AX,BX
+	MOV	DS,AX
+	MOV	CX,MODULE_SIZE
+	XOR	SI,SI
+	XOR	DI,DI
+	REP_MOVSB
+
+	MOV	AX,BOOT_HIGH_LOC
+	MOV	DS,AX
+
+//My assembler doesn't support 16-bit very well.
+	DU8	0xEA;	//JMP BOOT_HIGH_LOC:BHD_HISTART
+	DU16	BHD_HISTART-BHD_START,BOOT_HIGH_LOC;
+
+BHD_BIOS_DRV_NUM: DU8	0;
+
+//Gets patched by $LK,"InstallBoot","MN:InstallBoot"$().
+BHD_BLK_CNT::	DU16	0;
+
+BHD_DAP:	DU8	16,0,1,0; //One blk at a time
+BHD_DAP_BUF:	DU16	0,0;
+//Gets patched by $LK,"InstallBoot","MN:InstallBoot"$().
+BHD_DAP_BLK::	//64-bit
+BHD_DAP_BLK_LO:	DU32	0;
+BHD_DAP_BLK_HI:	DU32	0;
+
+BHD_HISTART:
+	MOV	U8 [BHD_BIOS_DRV_NUM-BHD_START],DL //Passed in by BIOS
+	MOV	AX,BOOT_RAM_BASE/16
+	MOV	ES,AX
+	XOR	ECX,ECX
+	MOV	CX,U16 [BHD_BLK_CNT-BHD_START]
+
+@@05:	PUSH	CX	//Blk cnt
+
+//READ BLK
+	PUSH	ES	//Buf seg
+	MOV	AX,ES
+	MOV	U16 [BHD_DAP_BUF+2-BHD_START],AX //ES:0000
+	MOV	SI,BHD_DAP-BHD_START //DS:SI=DAP
+	MOV	AH,0x42
+	MOV	DL,U8 [BHD_BIOS_DRV_NUM-BHD_START]
+	INT	0x13
+
+	POP	AX	//ES
+	ADD	AX,BLK_SIZE/16
+	MOV	ES,AX
+	INC	U32 [BHD_DAP_BLK_LO-BHD_START]
+	JNZ	@@10
+	INC	U32 [BHD_DAP_BLK_HI-BHD_START]
+
+@@10:	POP	CX
+	LOOP	@@05
+
+	MOV	EBX,BOOT_CODE_HARDDRV //$MA+A-X+PU,"See sys_boot_code","Grep(\"sys_boot_code\",\"/SparrowOS/\"TEXT_FILE_MASK);View;\n"$
+//My assembler doesn't support 16-bit very well.
+	DU8	0xEA;	//JMP BOOT_RAM_BASE:0000
+	DU16	0,BOOT_RAM_BASE/16;
+//Continues here $LK,"::/SparrowOS/OSMain/OSStart.CPP.Z","FL:::/SparrowOS/OSMain/OSStart.CPP.Z,1"$
+BHD_END::
+#assert BHD_END-BHD_START<MODULE_SIZE-2
+}