Int 21/AX=4402h

Advanced SCSI Programming Interface (ASPI) - INTERFACE

AX = 4402h
BX = file handle for device "SCSIMGR$"
CX = 0004h or 0005h (refer to notes below)
DS:DX -> buffer for result (see #01452), set to zeros before call

Return:
CF clear if successful
AX = 0004h or 0005h (refer to notes below)
CF set on error
AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)

Notes: The variant of the call requesting five bytes is an UNDOCUMENTED extension supported by Adaptec's ASPI2DOS.SYS, ASPI4DOS.SYS, and ASPI7DOS.SYS; if made of a host manager which does not support the variant, only four bytes will be returned. If the variant is supported, Adaptec's WINASPI.DLL assumes that the host manager is an "advanced" one which operates in either real or protected mode (and thus does not require a DPMI INT 31/AX=0301h call to be invoked from protected mode). Support of the five-byte variant also appears to imply that an advanced ASPI host manager uses no temporary storage space except the SRB (see #01454) and the stack, and that it is fully reentrant.. If called with a standard request for four bytes, even Adaptec's advanced drivers return only the requested four bytes containing the ASPI entry point address. The function address is called with the address of a SCSI Request Block (see #01454) on the stack and the caller must clean up the stack

See Also: AX=440Ch"ASPITAPE" - INT 11/AH=FFh"WD7000"


Format of ASPI IOCTL result:

Offset  Size    Description     (Table 01452)
00h    DWORD   function address
04h    BYTE    number of SCSI host adapters supported by host manager


(Table 01453)
Values for ASPI request number:
00h    "HA_INQ"        host adapter inquiry / extended host adapter inquiry
01h    "GET_TYPE"      get device type
02h    "EXEC_SIO"      execute SCSI I/O
03h    "ABORT_SRB"     abort SRB
04h    "RESET_DEV"     reset SCSI device
05h    "SET_HAPRMS"    set host adapter parameters
06h    get disk drive information
7Fh    (Adaptec) get ASPI manager info?

Note: Request 7Fh is supported by all the Adaptec's DOS ASPI managers: ASPI2DOS.SYS (for AHA-152x), ASPI4DOS.SYS (for AHA-154x/164x), ASPI7DOS.SYS (for AIC-77xx), and ASPI8DOS.SYS (for AIC-78xx)


Format of SCSI Request Block (64 bytes):

Offset  Size    Description     (Table 01454)
00h    BYTE    request number (see #01453)
01h    BYTE    request status (see #01455)
02h    BYTE    host adapter ID
03h    BYTE    request flags (see #01456)
04h    DWORD   reserved (0)
---request 00h---
08h    BYTE    (ret) number of host adapters
09h    BYTE    (ret) target adapter ID
0Ah 16 BYTEs   (ret) SCSI manager ID
1Ah 16 BYTEs   (ret) host adapter ID
2Ah 16 BYTEs   (ret) host adapter-unique parameters (see #90010,#90011)
---extended request 00h---
04h  2 BYTEs   (call) extended request signature 55h AAh
(ret) if extended request supported, reply AAh 55h
06h    WORD    (call) length of extended buffer at offset 3Ah
(ret) number of bytes returned in extended buffer
08h    BYTE    (ret) number of host adapters
09h    BYTE    (ret) target adapter ID
0Ah 16 BYTEs   (ret) SCSI manager ID
1Ah 16 BYTEs   (ret) host adapter ID
2Ah 16 BYTEs   (ret) host adapter-unique parameters
3Ah  N BYTEs   extended buffer
3Ah     WORD    features (see #01457)
3Ch     WORD    maximum scatter/gather list length
3Eh     DWORD   maximum SCIS data transfer size (0 = unlimited)
---request 01h---
08h    BYTE    target ID
09h    BYTE    logical unit number
0Ah    BYTE    (ret) device type (see #01460)
---request 02h---
08h    BYTE    target ID
09h    BYTE    logical unit number
0Ah    DWORD   data allocation length
(ret) residual byte length (if supported and requested)
0Eh    BYTE    sense allocation length
0Fh    DWORD   data buffer pointer
13h    DWORD   next request pointer (for linking)
17h    BYTE    CDB length
18h    BYTE    (ret) host adapter status (see #01454)
19h    BYTE    (ret) target status (see #01459)
1Ah    DWORD   post routine address (see #01466)
1Eh    WORD    real mode Post DS
20h    DWORD   SRB pointer
24h    WORD    reserved
26h    DWORD   SRB physical address
2Ah 22 BYTEs   SCSIMGR$ workspace
40h  N BYTEs   CCB, including sense data (20-24 bytes)
---request 03h---
08h    DWORD   address of SRB to abort
---request 04h---
08h    BYTE    target ID
09h    BYTE    logical unit number
0Ah 14 BYTEs   reserved
18h    BYTE    (ret) host adapter status (see #01458)
19h    BYTE    (ret) target status (see #01459)
1Ah    DWORD   post routine address
1Eh 34 BYTEs   workspace
---request 05h---
08h 16 BYTEs   host adapter-unique parameters
---request 06h---
08h    BYTE    target ID
09h    BYTE    logical unit number
0Ah    BYTE    disk drive flags (see #01461)
0Bh    BYTE    INT 13h drive number
0Ch    BYTE    preferred head number translation
0Dh    BYTE    preferred sector size translation
0Eh 10 BYTEs   reserved
---request 7Fh---
08h    WORD    base I/O port address
0Ah    BYTE    number of I/O ports used
0Bh    BYTE    ??? (01h returned for AHA-152x)
0Ch    BYTE    interrupt level
0Dh    BYTE    DMA channel
0Eh    BYTE    (ASPI7DOS.SYS) EISA slot  number
(ASPI8DOS.SYS) PCI device number
0Fh    BYTE    bits 7-1:
Reserved (0)
bit 0:
(AHA-152x) ???
10h    DWORD   ASPI entry point address
14h    DWORD   previous ASPI entry point address
18h    WORD    offset to "ASPI request dispatcher" procedure
1Ah    WORD    offset to "interrupt handler" procedure
1Ch    WORD    offset to some procedure
1Eh    WORD    offset to some procedure
20h    WORD    offset to host adapter data
22h    BYTE    ??? (apparently always 02h)
23h    BYTE    reserved??? (0)
24h    BYTE    (ASPI8DOS.SYS) PCI bus number?
25h  11 BYTEs  reserved??? (0)

See Also: #01462

(Table 01455) Values for ASPI request status: 00h not done yet 01h completed successfully 02h aborted by host 04h SCSI I/O error 80h invalid 81h no adapter 82h no device attached else status

See Also: #01454

Bitfields for ASPI request flags: Bit(s) Description (Table 01456) 0 posting enabled 1 linking enabled 2 residual byte length reported in Data Allocation Length field 3 transfer from SCSI target to host 4 transfer from host to SCSI target 5 scatter/gather 7-6 reserved

Note: No data is transferred if both bits 3 and 4 are set; if neither is set, the direction is determined by the SCSI command

See Also: #01454

Bitfields for ASPI extended features: Bit(s) Description (Table 01457) 0 scatter/gather supported 1 residual byte length reported 2 Wide SCSI 16 host adapter 3 Wide SCSI 32 host adapter 15-4 reserved

See Also: #01454

(Table 01458) Values for host adapter status: 00h no error detected 11h select timeout 12h data overrun 13h bus error 14h bus failure

(Table 01459) Values for target status: 00h no status 02h sense data stored in SRB 08h target busy 18h reservation error

(Table 01460) Values for device type: 00h disk drive 01h tape drive (streamer) 02h printer 03h processor 04h WORM drive 05h CD-ROM drive 06h scanner 07h optical drive 08h autochanger 09h communications device

(Table 01461) Values for disk drive flags: 00h no INT 13 access 01h INT 13 with DOS access 02h INT 13 without DOS access 03h invalid flags

Format of CCB: Offset Size Description (Table 01462) 00h BYTE command code (see #01463) 01h BYTE flags

bits 4-0:
Vary by function

bits 7-5:
Logical unit number 02h BYTE "adr_1" 03h BYTE "adr_0" 04h BYTE length 05h BYTE control. ... 06h/0Ah 14 BYTEs buffer for sense data (see #01464)

See Also: #01454

(Table 01463) Values for CCB command code: 00h test unit ready 01h rewind 03h request sense data 05h get block size limits 08h Group 0 read 0Ah Group 0 write 10h write file marks 11h SCSI Space (set position?) 12h SCSI Inquire 15h set mode information 16h reserve SCSI device 17h release SCSI device 19h erase 1Ah request mode information 1Bh load/unload media 1Dh request target self-check 24h set window parameters 25h get window parameters 28h Group 1 read 2Ah Group 1 write 31h document feeder control 34h get scan data status ---vendor-specific commands--- D3h get document feeder status D4h set document feeder mode

Format of sense data: Offset Size Description (Table 01464) 00h BYTE error code (bit 7 set if valid) 01h BYTE segment number 02h BYTE sense key

bit 6:
EOM

bit 5:
ILI

bits 0-3:
Sense key (see #01465) 03h 4 BYTEs information bytes 07h BYTE additional sense length (0Ah) 08h 4 BYTEs command-specific information 0Ch BYTE additional sense code 0Dh BYTE additional sense code qualifier 0Eh BYTE field replaceable unit code 0Fh 3 BYTEs sense key specific bytes

(Table 01465) Values for sense key: 00h no sense data 02h SCSI unit not ready 03h media error 04h unrecoverable hardware error 05h illegal parameter in CDB 06h target has been reset 0Bh target aborted command

(Table 01466) Values ASPI post function is called with:.

STACK:
DWORD -> SRB (see #01454) which completed. Interrupts disabled

Return:
EBP, EBX, ESI, EDI must be preserved interrupts disabled

Note: The post function may issue any ASPI function except an abort; it should complete as quickly as possible


Format of ASPI2DOS.SYS v3.65 host adapter unique parameters:

Offset  Size    Description     (Table 90010)
00h    WORD    reserved? (0)
02h    WORD    reserved? (0)
04h    WORD    base I/O port address
06h    BYTE    interrupt level
07h  9 BYTEs   reserved  (0)

See Also: #90011 - #01454

Format of ASPI4DOS.SYS v3.35 host adapter unique parameters: Offset Size Description (Table 90011) 00h WORD offset to "ASPI request dispatcher" procedure 02h WORD offset to "interrupt handler" procedure 04h 12 BYTEs reserved (0)

See Also: #90010 - #01454

Category: Disk I/O Enhancements - Int 21h - A

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