SparrowOSTS_121127.ISO

2018-09-08 21:45:28 +02:00
1 parent 0e9364ff4c
commit e57428affb
@@ -0,0 +1,157 @@
+asm {
+#define MODULE_SIZE		CD_BOOT_LOADER_SIZE
+#define BOOT_HIGH_LOC	((BOOT_RAM_LIMIT-(BOOT_STK_SIZE+MODULE_SIZE))>>4)
+USE16
+BCD_START::
+//DL is supposed to have the BIOS drive number
+	CLD
+	MOV	AX,BOOT_HIGH_LOC
+	MOV	ES,AX
+
+	CLI
+	MOV	SS,AX
+	MOV	SP,BOOT_STK_SIZE+MODULE_SIZE
+	STI
+
+	CALL	BCD_GET_IP
+BCD_GET_IP:
+	POP	BX
+	SUB	BX,BCD_GET_IP-BCD_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:BCD_MAIN
+	DU16	BCD_MAIN-BCD_START,BOOT_HIGH_LOC;
+
+BCD_BIOS_DRV_NUM:	DU8	0;
+BCD_PAGE:		DU8	0;
+
+BCD_DAP:		DU8	16,0,1,0; //One blk at a time
+BCD_DAP_BUF:		DU16	0,0;
+BCD_DAP_BLK:		DU64	0;
+	
+BCD_SPARROWOS_MSG:
+	DU8	"Loading SparrowOS",0;
+
+BCD_NOT64_MSG:
+	DU8	"SparrowOS requires a 64-bit capable processor.\n\r",0;
+
+//These get patched by $LK,"CDBootFileCreate","MN:CDBootFileCreate"$
+BCD_BLK_LO::		DU16	0;
+BCD_BLK_HI::		DU16	0;
+BCD_BLK_CNT::		DU16	0;
+
+BCD_PROGRESS_STEP::	DU32	0;
+BCD_PROGRESS_VAL::	DU32	0;
+
+BCD_PUTCHAR::
+	MOV	AH,0xE
+	MOV	BL,7 //Might be foreground color on some BIOS's
+	MOV	BH,U8 [BCD_PAGE-BCD_START]
+	INT	0x10
+BCD_RET::
+	RET
+BCD_PUTS::
+@@1:	LODSB
+	OR	AL,AL
+	JZ	BCD_RET
+	CALL	BCD_PUTCHAR
+	JMP	@@1
+
+BCD_MAIN::
+	MOV	U8 [BCD_BIOS_DRV_NUM-BCD_START],DL //Passed in by BIOS
+
+	MOV	AH,0xF
+	INT	0x10
+	MOV	U8 [BCD_PAGE-BCD_START],BH //video page
+
+	MOV	EAX,0x80000000
+	CPUID
+	CMP	EAX,0x80000001
+	JB	@@05
+
+	MOV	EAX,0x80000001
+	CPUID
+	BT	EDX,29
+	JC	@@15
+@@05:	MOV	SI,BCD_NOT64_MSG-BCD_START
+	CALL	BCD_PUTS
+@@10:	JMP	@@10
+
+@@15:	MOV	SI,BCD_SPARROWOS_MSG-BCD_START
+	CALL	BCD_PUTS
+
+	MOV	AX,BOOT_RAM_BASE/16
+	MOV	ES,AX
+	XOR	ECX,ECX
+	MOV	CX,U16 [BCD_BLK_CNT-BCD_START]
+
+	MOV	EAX,(80-7-9)*65536	//80 columns
+	XOR	EDX,EDX
+	DIV	ECX
+	MOV	U32 [BCD_PROGRESS_STEP-BCD_START],EAX
+	MOV	U32 [BCD_PROGRESS_VAL-BCD_START],0
+
+	MOV	AX,U16 [BCD_BLK_LO-BCD_START]
+	MOV	DX,U16 [BCD_BLK_HI-BCD_START]
+
+@@20:	PUSH	CX	//Blk cnt
+
+//READ BLK
+	PUSH	AX	//Blk lo
+	PUSH	DX	//Blk hi
+	PUSH	ES	//Buf seg
+	MOV	U16 [BCD_DAP_BLK-BCD_START],AX
+	MOV	U16 [BCD_DAP_BLK+2-BCD_START],DX
+	MOV	AX,ES
+	MOV	U16 [BCD_DAP_BUF+2-BCD_START],AX //ES:0000
+	MOV	SI,BCD_DAP-BCD_START //DS:SI=DAP
+	MOV	AH,0x42
+	MOV	DL,U8 [BCD_BIOS_DRV_NUM-BCD_START]
+	INT	0x13
+
+	POP	AX	//ES
+	ADD	AX,CD_BLK_SIZE/16
+	MOV	ES,AX
+	POP	DX
+	POP	AX
+	INC	AX
+	JNZ	@@25
+	INC	DX
+
+@@25:	PUSH	AX
+	MOV	BX,U16 [BCD_PROGRESS_VAL+2-BCD_START]
+	MOV	EAX,U32 [BCD_PROGRESS_STEP-BCD_START]
+	ADD	U32 [BCD_PROGRESS_VAL-BCD_START],EAX
+	CMP	U16 [BCD_PROGRESS_VAL+2-BCD_START],BX
+	JE	@@30
+	MOV	AL,'.'
+	CALL	BCD_PUTCHAR
+@@30:	POP	AX
+
+	POP	CX
+	LOOP	@@20
+
+//See $LK,"BootCdProbe","MN:BootCdProbe"$().
+	MOV	EBX,U32 [BCD_BLK_LO-BCD_START]
+	SHL	EBX,16
+	MOV	BX,BOOT_CODE_CDROM  //$MA+A-X+PU,"See sys_boot_code","Grep(\"sys_boot_code\",\"/SparrowOS/\"TEXT_FILE_MASK);View;\n"$
+
+//My assembler doesn't support 16-bit very well.
+	DU8	0xEA;	//JMP BOOT_RAM_BASE:0000
+	DU16	0,BOOT_RAM_BASE/16;
+//Continues here $LK,"::/SparrowOS/OSMain/OSStart.CPP.Z","FL:::/SparrowOS/OSMain/OSStart.CPP.Z,1"$
+BCD_END::
+#assert BCD_END-BCD_START<MODULE_SIZE
+}