LTCD_060719.ISO
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Terry A. Davis authored and minexew committed
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@@ -0,0 +1,298 @@
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asm {
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#define BOOT_ADDRESS 0x040000
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#define BLK_SIZE 0x200
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#define CD_BLK_SIZE 2048
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#define BOOT_HIGH_LOC ((0xA0000-5*BLK_SIZE)>>4)
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#define BOOT_CODE_FLOPPY 1
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#define BOOT_CODE_HARDDRIVE 2
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#define BOOT_CODE_CDROM 3
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#define BOOT_CODE_RAM 4
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#define WIN_NOP 0x00
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#define WIN_DEV_RESET 0x08
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#define WIN_PACKETCMD 0xA0 /* Send a packet cmd. */
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#define ERR_STAT 0x01
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#define DRQ_STAT 0x08
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#define SEEK_STAT 0x10
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#define READY_STAT 0x40
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#define BUSY_STAT 0x80
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#define DRIVE_READY (READY_STAT | SEEK_STAT)
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#define DATA_READY (DRQ_STAT)
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#define IDE_PRIMARY_BASE 0x1F0
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#define IDE_SECONDARY_BASE 0x170
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#define IDE_DATA_REG (0)
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#define IDE_FEATURE_REG (1)
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#define IDE_NSECTOR_REG (2)
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#define IDE_SECTOR_REG (3)
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#define IDE_LCYL_REG (4)
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#define IDE_HCYL_REG (5)
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#define IDE_SELECT_REG (6)
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#define IDE_STATUS (7)
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#define IDE_CMD (7)
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#define IDE_CONTROL_REG (0x3F6-0x1F0)
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USE16
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BCD2_START::
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CLD
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MOV AX,BOOT_HIGH_LOC
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MOV ES,AX
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MOV SS,AX
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MOV SP,5*BLK_SIZE
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CALL U2 GET_IP
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GET_IP:
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POP BX
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SUB BX,GET_IP
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SHR BX,4
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MOV AX,CS //COPY HIGH
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ADD AX,BX
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MOV DS,AX
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MOV CX,CD_BLK_SIZE
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XOR SI,SI
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XOR DI,DI
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REP_MOVSB
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MOV AX,SS
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MOV DS,AX
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MOV AX,BOOT_ADDRESS/16
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MOV ES,AX
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XOR DI,DI //ES:[DI]=DEST
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MOV SI,MSG_PS
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CALL BCD2_PUTS
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XOR AH,AH
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INT 0x16
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MOV SI,IDE_SECONDARY_BASE
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CMP AL,'S'
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JE @@12
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CMP AL,'s'
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JE @@12
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MOV SI,IDE_PRIMARY_BASE
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@@12:
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/**********
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PUSH ES
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XOR AX,AX
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MOV ES,AX
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MOV AL,U1 ES:[0x3EE]
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POP ES
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*******/
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PUSH SI
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MOV SI,MSG_UNIT
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CALL BCD2_PUTS
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XOR AH,AH
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INT 0x16
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POP SI
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SHL AL,4
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OR AL,0xE0
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MOV U1 [BCD2_UNIT_VALUE+1],AL
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CLI
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DU1 0xEA;
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DU2 BCD2_MAIN,BOOT_HIGH_LOC;
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MSG_PS::
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DU1 "\r\n\r\n\r\n\r\n"
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"\r\nBooting LoseThos Operating System from CD-ROM..."
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"\r\n\r\nPlease specify the location of the CD-ROM"
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"\r\ndrive you are booting from. (I don't know how"
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"\r\nto detect it.) Typically, CD-ROMs are on the"
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"\r\nsecondary controller, so press 's' if this is the case."
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"\r\n\r\n (p)rimary or (s)econdary IDE controller:",0;
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MSG_UNIT::
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DU1 "\r\n\r\nTypically, CD-ROMs are the master unit, so"
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"\r\npress '0' if this is the case."
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"\r\n\r\n Unit (0=Master or 1=Slave):",0;
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BCD2_PUTS::
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LODSB
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OR AL,AL
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JZ BCD2_RET
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MOV AH,0x0E
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MOV BX,0x07
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INT 0x10
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JMP BCD2_PUTS
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BCD2_STAT::
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MOV DX,SI
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ADD DX,IDE_STATUS
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IN AL,DX
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BCD2_RET:
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RET
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BCD2_SELECT_UNIT::
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MOV DX,SI
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ADD DX,IDE_SELECT_REG
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BCD2_UNIT_VALUE::
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MOV AL,0xF0 //Gets patched
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OUT DX,AL
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RET
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BCD2_CMD::
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MOV AH,AL
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XOR AL,AL
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MOV DX,SI
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ADD DX,IDE_FEATURE_REG
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OUT DX,AL
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MOV AL,AH
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MOV DX,SI
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ADD DX,IDE_CMD
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OUT DX,AL
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RET
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BCD2_WAIT_NOT_BUSY::
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CALL BCD2_STAT
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AND AL,BUSY_STAT
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JNZ BCD2_WAIT_NOT_BUSY
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RET
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BCD2_WAIT_DRQ::
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CALL BCD2_STAT
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AND AL,DRQ_STAT
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JZ BCD2_WAIT_DRQ
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RET
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BCD2_PKT::
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PUSH AX
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CALL BCD2_WAIT_DRQ
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POP BX
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MOV AL,BH
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MOV AH,BL
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MOV DX,SI
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ADD DX,IDE_DATA_REG
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OUT DX,AX
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RET
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BCD2_RESET::
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CALL BCD2_SELECT_UNIT
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MOV AL,WIN_DEV_RESET
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CALL BCD2_CMD
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CALL BCD2_WAIT_NOT_BUSY
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RET
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BCD2_MAIN::
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CALL BCD2_RESET
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BCD2_WAIT_READY::
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MOV ECX,100000 //Busy wait
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MOV DX,0x379 //Par Port
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@@1: IN AL,DX
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DEC ECX
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JNZ @@1
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BCD2_WAIT_READY2::
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CALL BCD2_SELECT_UNIT
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MOV AL,WIN_NOP
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CALL BCD2_CMD
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CALL BCD2_WAIT_NOT_BUSY
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CALL BCD2_STAT
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AND AL,READY_STAT
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JNZ @@1
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CALL BCD2_RESET
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JMP BCD2_WAIT_READY
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@@1: CALL BCD2_SELECT_UNIT
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MOV AL,WIN_PACKETCMD
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CALL BCD2_CMD
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MOV AX,0x1B00
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CALL BCD2_PKT
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XOR AX,AX
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CALL BCD2_PKT
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MOV AX,0x0100
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CALL BCD2_PKT
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XOR AX,AX
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CALL BCD2_PKT
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XOR AX,AX
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CALL BCD2_PKT
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XOR AX,AX
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CALL BCD2_PKT
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CALL BCD2_WAIT_NOT_BUSY
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MOV DX,SI
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ADD DX,IDE_FEATURE_REG
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IN AL,DX
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OR AL,AL
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JNZ BCD2_WAIT_READY
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BCD2_SEND_READ::
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MOV AL,8
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MOV DX,SI
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ADD DX,IDE_CONTROL_REG
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OUT DX,AL
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CALL BCD2_SELECT_UNIT
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MOV AL,0
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MOV DX,SI
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ADD DX,IDE_LCYL_REG
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OUT DX,AL
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MOV AL,8
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INC DX //IDE_HCYL_REG
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OUT DX,AL
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MOV AL,WIN_PACKETCMD
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CALL BCD2_CMD
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MOV AX,0xA800
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CALL BCD2_PKT
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BCD2_BLK_HI::
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MOV AX,512
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CALL BCD2_PKT
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BCD2_BLK_LO::
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MOV AX,512
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CALL BCD2_PKT
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XOR AX,AX //cnt_hi
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CALL BCD2_PKT
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BCD2_BLK_CNT::
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MOV AX,512
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PUSH AX
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CALL BCD2_PKT
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XOR EAX,EAX
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CALL BCD2_PKT
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POP AX //cnt
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SHL EAX,10
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MOV EBX,EAX
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@@10: CALL BCD2_WAIT_DRQ
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XOR ECX,ECX
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MOV DX,SI
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ADD DX,IDE_HCYL_REG
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IN AL,DX
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MOV CH,AL
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MOV DX,SI
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ADD DX,IDE_LCYL_REG
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IN AL,DX
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MOV CL,AL
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SHR1 CX
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JZ @@10
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CMP CX,0x7F00
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JB @@20
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MOV CX,0x7F00
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@@20: PUSH CX
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MOV DX,SI
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ADD DX,IDE_DATA_REG
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REP_INSW
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MOV AX,DI
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SHR AX,4
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MOV DX,AX
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MOV AX,ES
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ADD AX,DX
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MOV ES,AX
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AND DI,0xF
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POP CX
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SUB EBX,ECX
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JZ @@100 //TODO look-up branch
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JNC @@10
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@@100: CALL BCD2_WAIT_NOT_BUSY
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MOV AX,SI
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SHL EAX,16
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MOV AH,U1 [BCD2_UNIT_VALUE+1]
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MOV AL,BOOT_CODE_CDROM
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MOV EBX,EAX
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DU1 0xEA;
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BCD2_JMP_START::
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DU2 0,BOOT_ADDRESS/16;
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BCD2_END::
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END
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}
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