mirror of
https://github.com/Tolik-Trek/Estex-DSS.git
synced 2026-06-15 09:21:47 +03:00
719 lines
15 KiB
NASM
719 lines
15 KiB
NASM
;!TODO ¯à¨¢¥á⨠ª ®¡é¥¬ã ¢¨¤ã ¢ ®¤ã ¨áâàãªæ¨î, ¯à®¢¥à¨âì ª®à४â®áâì
|
||
;---------------------------------------------------------------
|
||
;Rev Date Name Description
|
||
;---------------------------------------------------------------
|
||
;R02 06-08-2001 DNS Secondary IDE
|
||
;R01 06-08-2001 DNS Fixed BUG with partitions on Second hard disk
|
||
;---------------------------------------------------------------
|
||
;
|
||
; Disk Driver Specification ver. 2.20
|
||
;[]===========================================================[0]
|
||
;Procedure: Initialization
|
||
;
|
||
;Function: Initialization device(s)
|
||
;
|
||
;Input: C = #00
|
||
; IX = Environment
|
||
;
|
||
;Output: A = Amount drive support
|
||
;[]===========================================================[0]
|
||
|
||
;[]===========================================================[1]
|
||
;Procedure: Open
|
||
;
|
||
;Function: Open disk
|
||
;
|
||
;Input: C = #01
|
||
; A = Drive
|
||
;
|
||
;Output: None
|
||
;[]===========================================================[1]
|
||
|
||
;[]===========================================================[2]
|
||
;Procedure: Close
|
||
;
|
||
;Function: Close disk
|
||
;
|
||
;Input: C = #02
|
||
; A = Drive
|
||
;
|
||
;Output: None
|
||
;[]===========================================================[2]
|
||
|
||
;[]===========================================================[3]
|
||
;Procedure: Media check
|
||
;
|
||
;Function: Checking change line
|
||
;
|
||
;Input: C = #03
|
||
; A = Drive
|
||
;
|
||
;Output: A = #00 disk no changed
|
||
; #FF disk changed
|
||
;[]===========================================================[3]
|
||
|
||
;[]===========================================================[4]
|
||
;Procedure: Get BPB
|
||
;
|
||
;Function: Get Block Parameters BIOS
|
||
;
|
||
;Input: C = #04
|
||
; A = Drive
|
||
; DE = Address
|
||
;
|
||
;Output: None
|
||
;[]===========================================================[4]
|
||
|
||
;[]===========================================================[5]
|
||
;Procedure: Read
|
||
;
|
||
;Function: Read from disk
|
||
;
|
||
;Input: C = #05
|
||
; HL:IX = Logical Block (sector)
|
||
; DE = Address
|
||
; B = Sector count
|
||
; A = Drive
|
||
;
|
||
;Output: None
|
||
;[]===========================================================[5]
|
||
|
||
;[]===========================================================[6]
|
||
;Procedure: Write
|
||
;
|
||
;Function: Write to disk
|
||
;
|
||
;Input: C = #06
|
||
; HL:IX = Logical Block (sector)
|
||
; DE = Address
|
||
; B = Sector count
|
||
;
|
||
;Output: None
|
||
;[]===========================================================[6]
|
||
|
||
;[]===========================================================[7]
|
||
;Procedure: Removable
|
||
;
|
||
;Function: Checking change line
|
||
;
|
||
;Input: C = #07
|
||
; A = Drive
|
||
;
|
||
;Output: A = #00 Removable
|
||
; A = #FF Non-removable
|
||
;[]===========================================================[7]
|
||
|
||
;[]===========================================================[8]
|
||
;Procedure: Generic IOCTL
|
||
;
|
||
;Function: Generic Input Output Control
|
||
;
|
||
;Input: C = #08
|
||
; B = Subcommand
|
||
; DE = #55AA Magic Number
|
||
;
|
||
;Subcommands: #00 - Get Device Parameters
|
||
; #01 - Read track
|
||
; #02 - Test track
|
||
; #80 - Set Device Parameters
|
||
; #81 - Write track
|
||
; #82 - Format track
|
||
;Output:
|
||
;[]===========================================================[8]
|
||
|
||
;[]===========================================================[9]
|
||
;Procedure: Read Long
|
||
;
|
||
;Function: Reading sectors from disk
|
||
;
|
||
;Input: C = #0A
|
||
; HL:IX = Logical Block (sector)
|
||
; DE = Address
|
||
; B = Sector count
|
||
; A' = Page
|
||
;
|
||
;Output: A' = Next Page
|
||
; HL:IX = Next Logical Block (sector)
|
||
; DE = Next Address
|
||
;[]===========================================================[9]
|
||
|
||
;[]===========================================================[10]
|
||
;Procedure: Write Long
|
||
;
|
||
;Function: Writing sectors to disk
|
||
;
|
||
;Input: C = #0B
|
||
; HL:IX = Logical Block (sector)
|
||
; DE = Address
|
||
; B = Sector count
|
||
; A' = Page
|
||
;
|
||
;Output: A' = Next Page
|
||
; HL:IX = Next Logical Block (sector)
|
||
; DE = Next Address
|
||
;[]===========================================================[10]
|
||
|
||
;
|
||
; Errors:
|
||
; 0 (#00) - NO ERRORS
|
||
; 1 (#01) - BAD COMMAND
|
||
; 2 (#02) - BAD DRIVE NUMBER
|
||
; 3 (#03) - UNKNOW FORMAT
|
||
; 4 (#04) - NOT READY
|
||
; 5 (#05) - SEEK ERROR
|
||
; 6 (#06) - SECTOR NOT FOUND
|
||
; 7 (#07) - CRC ERROR
|
||
; 8 (#08) - WRITE PROTECT
|
||
; 9 (#09) - READ ERROR
|
||
; 10 (#0A) - WRITE ERROR
|
||
; 11 (#0B) - FAILURE
|
||
; 12 (#0C) - BUSY (DEVICE OPENED)
|
||
; 13 (#0D) - RESERVED
|
||
|
||
; IDE0 EQU #0C1C0
|
||
; IDE1 EQU #0C1C8
|
||
PARTITION_BUFFER _sBOOT_SECTOR = #C000 ; EQU #C000 _sBOOT_SECTOR
|
||
|
||
HDDRIVE INC C
|
||
DEC C
|
||
JP Z,INIT_H ; c=0 Initialization
|
||
DEC C
|
||
JP Z,RESE_H ; c=1 open
|
||
DEC C
|
||
JP Z,STAT_H ; c=2 close
|
||
DEC C
|
||
JP Z,CHEK_H ; c=3 media check (ᬥ ®á¨â¥«ï)
|
||
DEC C
|
||
JP Z,GBPB_H ; c=4 get BPB
|
||
DEC C
|
||
JP Z,READH ; c=5 read (ç⥨¥ ᥪâ®à®¢)
|
||
DEC C
|
||
JP Z,WRITEH ; c=6 write (§ ¯¨áì ᥪâ®à®¢)
|
||
DEC C
|
||
JP Z,REMOV_H ; c=7 Removable
|
||
DEC C
|
||
JP Z,IOCTL_H ; c=8 㧠âì £¥®¬¥âà¨î ¤¨áª Generic IOCTL
|
||
DEC C
|
||
JP Z,RESR_H ; c=9 Reserved
|
||
DEC C
|
||
JP Z,LREADH ; c=10 Read Long
|
||
DEC C
|
||
JP Z,LWRITEH ; c=11 Write Long
|
||
RESR_H LD A,DSS_Error.drv.INVALID_COMMAND
|
||
SCF
|
||
RET
|
||
|
||
|
||
////////////////////////////////////////////////////////////////////////
|
||
// Commands for restart #18 //
|
||
////////////////////////////////////////////////////////////////////////
|
||
|
||
;--------------------------------------------------------------------[v]
|
||
; c=0 Initialization
|
||
INIT_H: PUSH IY
|
||
;!TEST ;[ ] ¤«ï rescanDRV
|
||
XOR A
|
||
LD (DRVCLC.count),A
|
||
;
|
||
LD HL,LOGDRV
|
||
LD (OFFSECT),HL
|
||
|
||
LD IX,SYS_PAGE.TMP_BUFFER
|
||
LD C,BIOS.DRV_LIST
|
||
RST ToBIOS
|
||
; DRV_LIST:
|
||
; +0 LEN
|
||
; +1 FDD COUNT
|
||
; +2 HDD COUNT
|
||
; +3 CDROM COUNT
|
||
; +4 RESERVED (28)
|
||
;
|
||
IN A,(SLOT3)
|
||
LD C,A
|
||
LD A,SYS_PAGE
|
||
OUT (SLOT3),A
|
||
XOR A
|
||
LD B,(IX+2) ;ª®«¨ç¥á⢮ HDD ¤«ï ¯à®æ¥¤ãàë NX_DVCI
|
||
CP B
|
||
LD A,C
|
||
OUT (SLOT3),A
|
||
JR Z,NO_HARDS
|
||
LD C,#80 ;!HARDCODE - ID ¢¨â ¤«ï ¯à®æ¥¤ãàë BIOS.DRV_DETECT
|
||
|
||
NX_DVCI: PUSH BC
|
||
LD A,C
|
||
LD (DRV_NUM),A
|
||
LD C,BIOS.DRV_DETECT
|
||
RST ToBIOS
|
||
;JR C,.NO_DRIVE
|
||
CALL NC,DEFINE_PARTITIONS.BEGIN
|
||
POP BC
|
||
INC C
|
||
JR C,NX_DVCI
|
||
DJNZ NX_DVCI
|
||
;
|
||
NO_HARDS:
|
||
POP IY
|
||
;!TEST
|
||
; LD HL,(OFFSECT)
|
||
; LD DE,LOGDRV
|
||
; XOR A
|
||
; SBC HL,DE
|
||
; RET Z
|
||
; LD DE,LOGDRV.TBL_Entry
|
||
DRVCLC: ; INC A
|
||
; SBC HL,DE
|
||
; JR NZ,DRVCLC
|
||
;
|
||
.count+1: LD A,0
|
||
;
|
||
AND A
|
||
RET
|
||
;---------------------------------------------------------------------[^]
|
||
|
||
; ;+00 BYTE MASTER/SLAVE PHISICAL DRIVE NUMBER #80/#81/...
|
||
; ;+01 DWORD SECTOR OFFSET
|
||
; ;+05 DWORD SIZE IN SECTORS
|
||
; ;+09 FREE
|
||
; ;+15
|
||
; LOGDRV: BLOCK .TBL_Entry * LD_DSK,0
|
||
; .TBL_Entry EQU 16
|
||
; .Size EQU $-LOGDRV
|
||
|
||
;!TODO § ¬¥¨âì PUSH EXX?
|
||
SELHDD: PUSH DE
|
||
PUSH BC
|
||
PUSH HL
|
||
;
|
||
LD L,A
|
||
LOGDRV_ENTRY_FIND LOGDRV
|
||
; !HARDCODE
|
||
LD C,(IY+1)
|
||
LD B,(IY+2)
|
||
LD E,(IY+3)
|
||
LD D,(IY+4)
|
||
POP HL
|
||
ADD IX,BC
|
||
ADC HL,DE
|
||
LD A,(IY+0) ;DRIVE NUMBER
|
||
POP BC
|
||
POP DE
|
||
RET
|
||
|
||
; 00 - GET DEVICE PARAMETERS
|
||
; 01 - READ TRACK
|
||
; 02 - TEST TRACK
|
||
; 80 - SET DEVICE PARAMETERS
|
||
; 81 - WRITE TRACK
|
||
; 82 - FORMAT TRACK
|
||
IOCTL_H BIT 7,B
|
||
JR NZ,O_CTL_H
|
||
INC B
|
||
DEC B
|
||
JP Z,HGETPRM
|
||
DEC B
|
||
JP Z,HRDTRAC
|
||
DEC B
|
||
JP Z,HCHTRAC
|
||
LD A,DSS_Error.drv.INVALID_COMMAND
|
||
SCF
|
||
RET
|
||
|
||
O_CTL_H RES 7,B
|
||
INC B
|
||
DEC B
|
||
JP Z,HSETPRM
|
||
DEC B
|
||
JP Z,HWRTRAC
|
||
DEC B
|
||
JP Z,HFRTRAC
|
||
LD A,DSS_Error.drv.INVALID_COMMAND
|
||
SCF
|
||
RET
|
||
|
||
HRDTRAC LD A,DSS_Error.drv.GENERAL_FAILURE
|
||
SCF
|
||
RET
|
||
|
||
HCHTRAC LD B,L
|
||
CALL CHECKH
|
||
RET
|
||
|
||
HSETPRM AND A
|
||
RET
|
||
|
||
HWRTRAC LD A,DSS_Error.drv.GENERAL_FAILURE
|
||
SCF
|
||
RET
|
||
|
||
HFRTRAC LD A,DSS_Error.drv.GENERAL_FAILURE
|
||
SCF
|
||
RET
|
||
|
||
; HL:DE - SECTORS ON LOGICAL DISK
|
||
; C - PARTITION RECORD NUMBER IN DRIVE MBR. if #FF - then not supported ;[x] 17.12.2023 § £à㧪 á ªâ¨¢®£® à §¤¥« , ¥ á ¯¥à¢®£®
|
||
; HL' - CYLINDERS ON PHISICAL DISK
|
||
; DE' - HEADS ON PHISICAL DISK
|
||
; BC' - SECTORS PER TRACK ON PHISICAL DISK
|
||
; A' - PHISICAL DRIVE NUMBER
|
||
; A - DRIVE/HEAD REGISTER PHISICAL DISK:
|
||
; bit7 - reserved "1"
|
||
; bit6 - ADDRESSING MODE LBA/CHS
|
||
; bit5 - reserved "1"
|
||
; bit4 - DEVICE MASTER/SLAVE
|
||
; bit3 - reserved "0" (MAY BE OTHER)
|
||
; bit2 - reserved "0" (MAY BE OTHER)
|
||
; bit1 - reserved "0" (MAY BE OTHER)
|
||
; bit0 - Primary/Secondary Chanel
|
||
HGETPRM:
|
||
EX DE,HL
|
||
LD BC,#55AA
|
||
AND A
|
||
SBC HL,BC
|
||
LD L,A
|
||
LD A,DSS_Error.drv.GENERAL_FAILURE
|
||
SCF
|
||
RET NZ
|
||
;
|
||
PUSH IX
|
||
PUSH IY
|
||
;
|
||
LOGDRV_ENTRY_FIND LOGDRV
|
||
;
|
||
LD A,(IY+LOGDRV.PHISICAL_DRV_NUMBER) ;MASTER/SLAVE PHISICAL DRIVE NUMBER #80/#81/...
|
||
PUSH IY
|
||
LD C,BIOS.DRV_GET_PAR
|
||
RST ToBIOS
|
||
POP IY
|
||
LD A,DSS_Error.drv.INVALID_DRIVE
|
||
JR C,.error
|
||
; ¯¥à¥â ᮢª ॣ¨áâ஢ á १ã«ìâ ⮬ ®â BIOS
|
||
EX DE,HL
|
||
LD C,E
|
||
LD E,D
|
||
LD D,0
|
||
LD A,B
|
||
LD B,D
|
||
EXX
|
||
; SECTORS ON LOGICAL DISK
|
||
LD E,(IY+LOGDRV.SIZE_IN_SECTORS+0)
|
||
LD D,(IY+LOGDRV.SIZE_IN_SECTORS+1)
|
||
LD L,(IY+LOGDRV.SIZE_IN_SECTORS+2)
|
||
LD H,(IY+LOGDRV.SIZE_IN_SECTORS+3)
|
||
;
|
||
;[x] 17.12.2023 § £à㧪 á ªâ¨¢®£® à §¤¥« , ¥ á ¯¥à¢®£®
|
||
LD C,(IY+LOGDRV.PARTITION_RECORD_NUM) ; ®¬¥à ¯ àâ¨æ¨¨ ¢ MBR ¤¨áª
|
||
;
|
||
EX AF,AF'
|
||
LD A,(IY+LOGDRV.PHISICAL_DRV_NUMBER) ;MASTER/SLAVE PHISICAL DRIVE NUMBER #80/#81/...
|
||
EX AF,AF'
|
||
;
|
||
AND A
|
||
.error: POP IY
|
||
POP IX
|
||
RET
|
||
|
||
REMOV_H:
|
||
LD A,1
|
||
AND A
|
||
RET
|
||
|
||
|
||
|
||
RESE_H: XOR A
|
||
RET
|
||
|
||
STAT_H: XOR A
|
||
RET
|
||
|
||
CHEK_H: ;LD A,#FF
|
||
XOR A
|
||
;AND A
|
||
RET
|
||
|
||
|
||
; DE - ADDRESS
|
||
; A - DRIVE
|
||
GBPB_H: PUSH IY
|
||
PUSH DE
|
||
LD L,A
|
||
;
|
||
LOGDRV_ENTRY_FIND LOGDRV
|
||
; !HARDCODE
|
||
LD E,(IY+1)
|
||
LD D,(IY+2)
|
||
LD L,(IY+3)
|
||
LD H,(IY+4)
|
||
LD XL,E
|
||
LD XH,D
|
||
LD A,(IY+0)
|
||
POP DE
|
||
POP IY
|
||
LD BC,1*256 + BIOS.DRV_READ
|
||
JP ToBIOS
|
||
|
||
|
||
;HL:IX - SECTOR
|
||
; DE - ADDRESS
|
||
; B - COUNTER
|
||
; A'- PAGE
|
||
; A - HDD LOG NUMBER
|
||
;READ SECTOR
|
||
LREADH: PUSH IY
|
||
CALL SELHDD
|
||
LD C,BIOS.DRV_READ_LONG
|
||
RST ToBIOS
|
||
POP IY
|
||
RET
|
||
|
||
;HL:IX - SECTOR
|
||
; DE - ADDRESS
|
||
; B - COUNTER
|
||
; A'- PAGE
|
||
; A - HDD LOG NUMBER
|
||
;WRITE SECTOR
|
||
LWRITEH:
|
||
PUSH IY
|
||
CALL SELHDD
|
||
LD C,BIOS.DRV_WRITE_LONG
|
||
RST ToBIOS
|
||
POP IY
|
||
RET
|
||
|
||
;HL:IX - SECTOR
|
||
; DE - ADDRESS
|
||
; B - COUNTER
|
||
; A - HDD LOG NUMBER
|
||
;WRITE SECTOR
|
||
WRITEH: PUSH IY
|
||
CALL SELHDD
|
||
LD C,BIOS.DRV_WRITE
|
||
RST ToBIOS
|
||
POP IY
|
||
RET
|
||
|
||
;HL:IX - SECTOR
|
||
; DE - ADDRESS
|
||
; B - COUNTER
|
||
; A - HDD LOG NUMBER
|
||
;READ SECTOR
|
||
READH: PUSH IY
|
||
CALL SELHDD
|
||
LD C,BIOS.DRV_READ
|
||
RST ToBIOS
|
||
POP IY
|
||
RET
|
||
|
||
;HL:IX - SECTOR
|
||
; DE - ADDRESS
|
||
; B - COUNTER
|
||
; A - HDD LOG NUMBER
|
||
;CHECK SECTOR
|
||
CHECKH: PUSH IY
|
||
CALL SELHDD
|
||
LD C,BIOS.DRV_VERIFY
|
||
RST ToBIOS
|
||
POP IY
|
||
RET
|
||
|
||
;------------------------------[ PARTIT ]------------------------------;
|
||
DEFINE_PARTITIONS:
|
||
.FAT32_DOS:
|
||
.EASYDOS:
|
||
.MEDIDOS:
|
||
.HIGHDOS:
|
||
LD E,(IY + _sMBR_PARTITION_RECORD.Start_LBA + 0)
|
||
LD D,(IY + _sMBR_PARTITION_RECORD.Start_LBA + 1)
|
||
LD L,(IY + _sMBR_PARTITION_RECORD.Start_LBA + 2)
|
||
LD H,(IY + _sMBR_PARTITION_RECORD.Start_LBA + 3)
|
||
LD IX,(CURRENT_SECTOR_L)
|
||
ADD IX,DE
|
||
LD DE,(CURRENT_SECTOR_H)
|
||
ADC HL,DE
|
||
LD D,XH
|
||
LD E,XL
|
||
;BPB SECTOR
|
||
LD IX,(OFFSECT)
|
||
LD (IX + LOGDRV.SECTOR_OFFSET + 0),E
|
||
LD (IX + LOGDRV.SECTOR_OFFSET + 1),D
|
||
LD (IX + LOGDRV.SECTOR_OFFSET + 2),L
|
||
LD (IX + LOGDRV.SECTOR_OFFSET + 3),H
|
||
LD E,(IY + _sMBR_PARTITION_RECORD.Size_LBA + 0)
|
||
LD D,(IY + _sMBR_PARTITION_RECORD.Size_LBA + 1)
|
||
LD L,(IY + _sMBR_PARTITION_RECORD.Size_LBA + 2)
|
||
LD H,(IY + _sMBR_PARTITION_RECORD.Size_LBA + 3)
|
||
;SIZE DISK
|
||
LD (IX + LOGDRV.SIZE_IN_SECTORS + 0),E
|
||
LD (IX + LOGDRV.SIZE_IN_SECTORS + 1),D
|
||
LD (IX + LOGDRV.SIZE_IN_SECTORS + 2),L
|
||
LD (IX + LOGDRV.SIZE_IN_SECTORS + 3),H
|
||
;[x] 17.12.2023 § £à㧪 á ªâ¨¢®£® à §¤¥« , ¥ á ¯¥à¢®£®
|
||
.ExtendedPartitionFlag+1:
|
||
LD A,0
|
||
OR A ; !TODO § £à㧪 á à áè¨à¥®£® à §¤¥« ¥ ¯®¤¤¥à¦¨¢ ¥âáï
|
||
LD A,#FF
|
||
JR NZ,.not_supported ; ¥á«¨ à áè¨à¥ë© à §¤¥«, â® ®¡«®¬
|
||
;
|
||
POP BC
|
||
PUSH BC
|
||
LD A,+(_sMBR_PARTITION_TABLE / _sMBR_PARTITION_RECORD) ; Number of entries in the partition table
|
||
SUB B
|
||
.not_supported:
|
||
LD (IX + LOGDRV.PARTITION_RECORD_NUM),A
|
||
;
|
||
;!TEST <09>®¤áâà 客ª ®â ¯¥à¥¯®«¥¨ï â ¡«¨æë LOGDRV
|
||
LD A,(DRVCLC.count)
|
||
INC A
|
||
CP DSS_MAX_DRIVES_AMOUNT+1
|
||
RET NC
|
||
LD (DRVCLC.count),A
|
||
;
|
||
LD A,(DRV_NUM)
|
||
LD (IX + LOGDRV.PHISICAL_DRV_NUMBER),A
|
||
LD DE,LOGDRV.TBL_Entry ;DSKITEM
|
||
ADD IX,DE
|
||
LD (OFFSECT),IX
|
||
JP .NextPartition
|
||
;
|
||
.NotExtended:
|
||
CP PartitionSysTypes.FAT16
|
||
JR Z,.HIGHDOS
|
||
CP PartitionSysTypes.FAT16_LBA
|
||
JR Z,.HIGHDOS
|
||
CP PartitionSysTypes.FAT16_32Mb
|
||
JR Z,.MEDIDOS
|
||
CP PartitionSysTypes.FAT12
|
||
JR Z,.EASYDOS
|
||
;[ ] fat32
|
||
CP PartitionSysTypes.FAT32
|
||
JP Z,.FAT32_DOS
|
||
CP PartitionSysTypes.FAT32_LBA
|
||
JP Z,.FAT32_DOS
|
||
;
|
||
CP PartitionSysTypes.Win_Ext_LBA
|
||
JR Z,.SubLevel
|
||
;[x] 17/12/23 ¯à®¯ãáª à §¤¥«®¢ á ¥¨§¢¥áâ묨 ”‘, ®¯â¨¬¨§ æ¨ï ¤¥â¥ªâ
|
||
;OR A ;PartitionSysTypes.Empty
|
||
;JR NZ,NXTPART
|
||
JR .NextPartition ; à §¤¥« ¥ ¯®¤¤¥à¦¨¢ ¥âáï
|
||
;POP BC ; ¡ « á á⥪
|
||
;RET
|
||
;POP BC
|
||
;OR A
|
||
;RET Z
|
||
;NODEFIN:
|
||
;SCF
|
||
;RET
|
||
;
|
||
.BEGIN: IN A,(SLOT3)
|
||
PUSH AF
|
||
LD A,SHARED_PAGE
|
||
OUT (SLOT3),A
|
||
CALL .Start
|
||
POP AF
|
||
OUT (SLOT3),A
|
||
RET
|
||
.Start: LD IX,0
|
||
LD DE,0
|
||
LD (EXTDOSL),DE ;R01
|
||
LD (EXTDOSH),IX ;R01
|
||
;
|
||
.LOOP: LD (CURRENT_SECTOR_L),DE
|
||
LD (CURRENT_SECTOR_H),IX
|
||
CALL .LOAD_SECTOR
|
||
;
|
||
LD HL,(PARTITION_BUFFER.MBR_SIGNATURE)
|
||
LD DE,#AA55
|
||
AND A
|
||
SBC HL,DE
|
||
;[x] 17/12/23 ¯à®¯ãáª à §¤¥«®¢ á ¥¨§¢¥áâ묨 ”‘, ®¯â¨¬¨§ æ¨ï ¯¥à¥¡®à à §¤¥«®¢
|
||
;JR NZ,NODEFIN
|
||
SCF
|
||
RET NZ
|
||
;
|
||
LD IY,PARTITION_BUFFER.PARTITION_TABLE ; Offset of partition table in the MBR
|
||
LD B,+(_sMBR_PARTITION_TABLE / _sMBR_PARTITION_RECORD) ; Number of entries in the partition table
|
||
.DOSAGA:
|
||
PUSH BC
|
||
LD A,(IY+_sMBR_PARTITION_RECORD.FS_ID)
|
||
CP PartitionSysTypes.Extended
|
||
JR NZ,.NotExtended
|
||
.SubLevel:
|
||
PUSH IY
|
||
LD DE,(CURRENT_SECTOR_L)
|
||
LD IX,(CURRENT_SECTOR_H)
|
||
PUSH DE
|
||
PUSH IX
|
||
;[x] 17/12/23 ¯à®¯ãáª à §¤¥«®¢ á ¥¨§¢¥áâ묨 ”‘, ®¯â¨¬¨§ æ¨ï ¯¥à¥¡®à à §¤¥«®¢
|
||
LD A,(.ExtendedPartitionFlag)
|
||
INC A
|
||
LD (.ExtendedPartitionFlag),A ; !TODO § £à㧪 á à áè¨à¥®£® à §¤¥« ¥ ¯®¤¤¥à¦¨¢ ¥âáï
|
||
;
|
||
CALL .ParseExtended
|
||
;[x] 17/12/23 ¯à®¯ãáª à §¤¥«®¢ á ¥¨§¢¥áâ묨 ”‘, ®¯â¨¬¨§ æ¨ï ¯¥à¥¡®à à §¤¥«®¢
|
||
LD A,(.ExtendedPartitionFlag)
|
||
DEC A
|
||
LD (.ExtendedPartitionFlag),A ; !TODO § £à㧪 á à áè¨à¥®£® à §¤¥« ¥ ¯®¤¤¥à¦¨¢ ¥âáï
|
||
;
|
||
POP IX
|
||
POP DE
|
||
LD (CURRENT_SECTOR_L),DE
|
||
LD (CURRENT_SECTOR_H),IX
|
||
CALL .LOAD_SECTOR
|
||
POP IY
|
||
.NextPartition:
|
||
LD DE,_sMBR_PARTITION_RECORD ;Size of a partition table entry
|
||
ADD IY,DE
|
||
POP BC
|
||
DJNZ .DOSAGA
|
||
AND A
|
||
RET
|
||
.ParseExtended:
|
||
LD HL,(EXTDOSL)
|
||
LD DE,(EXTDOSH)
|
||
LD A,L
|
||
OR H
|
||
OR E
|
||
OR D
|
||
LD E,(IY + _sMBR_PARTITION_RECORD.Start_LBA + 0)
|
||
LD D,(IY + _sMBR_PARTITION_RECORD.Start_LBA + 1)
|
||
LD L,(IY + _sMBR_PARTITION_RECORD.Start_LBA + 2)
|
||
LD H,(IY + _sMBR_PARTITION_RECORD.Start_LBA + 3)
|
||
JP NZ,.EXTDOS2
|
||
LD (EXTDOSL),DE
|
||
LD (EXTDOSH),HL
|
||
LD IX,(EXTDOSH)
|
||
.EXTDOS2:
|
||
LD IX,(EXTDOSL)
|
||
ADD IX,DE
|
||
PUSH IX
|
||
LD DE,(EXTDOSH)
|
||
ADC HL,DE
|
||
PUSH HL
|
||
POP IX
|
||
POP DE
|
||
JP .LOOP
|
||
;
|
||
.LOAD_SECTOR:
|
||
PUSH IY
|
||
LD IX,(CURRENT_SECTOR_L)
|
||
LD HL,(CURRENT_SECTOR_H)
|
||
LD DE,PARTITION_BUFFER
|
||
LD A,(DRV_NUM)
|
||
LD BC,1*256 + BIOS.DRV_READ
|
||
RST ToBIOS
|
||
POP IY
|
||
RET
|
||
;----------------------------------------------------------------------;
|
||
;
|
||
|
||
;=======================================================================
|
||
; PHISICAL DRIVE NUMBER
|
||
; #80/#81 - primary ¬ áâ¥à/á«¥©¢, #82/#83 - secondary ¬ áâ¥à/á«¥©¢
|
||
DRV_NUM: DB #00
|
||
CURRENT_SECTOR_L: DW #0000
|
||
CURRENT_SECTOR_H: DW #0000
|
||
EXTDOSL: DW #0000 ;CURRENT PARTITION TABLE
|
||
EXTDOSH: DW #0000
|
||
OFFSECT: DW LOGDRV ;POINTER ON CURRENT DISK RECORD
|
||
;======================================================================= |