mirror of https://github.com/microsoft/MS-DOS.git
59 lines
2.6 KiB
NASM
59 lines
2.6 KiB
NASM
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SUBTTL DEVICE TABLE AND SRH DEFINITION
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PAGE
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; The device table list has the form:
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SYSDEV STRUC
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SDEVNEXT DD ? ;Pointer to next device header
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SDEVATT DW ? ;Attributes of the device
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SDEVSTRAT DW ? ;Strategy entry point
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SDEVINT DW ? ;Interrupt entry point
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SDEVNAME DB 8 DUP (?) ;Name of device (only first byte used for block)
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SYSDEV ENDS
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;Attribute bit masks
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DEVTYP EQU 8000H ;Bit 15 - 1 if Char, 0 if block
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DEVIOCTL EQU 4000H ;Bit 14 - CONTROL mode bit
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ISFATBYDEV EQU 2000H ;Bit 13 - Device uses FAT ID bytes, comp media.
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ISCIN EQU 0001H ;Bit 0 - This device is the console input.
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ISCOUT EQU 0002H ;Bit 1 - This device is the console output.
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ISNULL EQU 0004H ;Bit 2 - This device is the null device.
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ISCLOCK EQU 0008H ;Bit 3 - This device is the clock device.
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ISIBM EQU 0010H ;Bit 4 - This device is special
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;Static Reguest Header
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SRHEAD STRUC
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REQLEN DB ? ;Length in bytes of request block
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REQUNIT DB ? ;Device unit number
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REQFUNC DB ? ;Type of request
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REQSTAT DW ? ;Status Word
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DB 8 DUP(?) ;Reserved for queue links
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SRHEAD ENDS
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;Status word masks
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STERR EQU 8000H ;Bit 15 - Error
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STBUI EQU 0200H ;Bit 9 - Buisy
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STDON EQU 0100H ;Bit 8 - Done
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STECODE EQU 00FFH ;Error code
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WRECODE EQU 0
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;Function codes
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DEVINIT EQU 0 ;Initialization
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DINITHL EQU 26 ;Size of init header
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DEVMDCH EQU 1 ;Media check
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DMEDHL EQU 15 ;Size of media check header
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DEVBPB EQU 2 ;Get BPB
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DEVRDIOCTL EQU 3 ;IOCTL read
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DBPBHL EQU 22 ;Size of Get BPB header
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DEVRD EQU 4 ;Read
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DRDWRHL EQU 22 ;Size of RD/WR header
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DEVRDND EQU 5 ;Non destructive read no wait (character devs)
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DRDNDHL EQU 14 ;Size of non destructive read header
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DEVIST EQU 6 ;Input status
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DSTATHL EQU 13 ;Size of status header
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DEVIFL EQU 7 ;Input flush
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DFLSHL EQU 15 ;Size of flush header
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DEVWRT EQU 8 ;Write
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DEVWRTV EQU 9 ;Write with verify
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DEVOST EQU 10 ;Output status
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DEVOFL EQU 11 ;Output flush
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DEVWRIOCTL EQU 12 ;IOCTL write
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