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61 lines
1.8 KiB
61 lines
1.8 KiB
; SCCSID = @(#)buffer.asm 1.1 85/04/09
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BREAK <Disk I/O Buffer Header>
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;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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; C A V E A T P R O G R A M M E R ;
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; ;
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; Field definition for I/O buffer information
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BUFFINFO STRUC
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buf_link DD ? ; Pointer to next buffer in list
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buf_ID DB ? ; Drive of buffer (bit 7 = 0)
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; SFT table index (bit 7 = 1)
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; = FFH if buffer free
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buf_flags DB ? ; Bit 7 = 1 if Remote file buffer
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; = 0 if Local device buffer
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; Bit 6 = 1 if buffer dirty
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; Bit 5 = Reserved
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; Bit 4 = Search bit (bit 7 = 1)
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; Bit 3 = 1 if buffer is DATA
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; Bit 2 = 1 if buffer is DIR
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; Bit 1 = 1 if buffer is FAT
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; Bit 0 = Reserved
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buf_sector DW ? ; Sector number of buffer (bit 7 = 0)
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; The next two items are often refed as a word (bit 7 = 0)
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buf_wrtcnt DB ? ; For FAT sectors, # times sector written out
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buf_wrtcntinc DB ? ; " " " , # sectors between each write
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buf_DPB DD ? ; Pointer to drive parameters
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buf_fill DW ? ; How full buffer is (bit 7 = 1)
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BUFFINFO ENDS
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buf_offset EQU DWORD PTR buf_sector
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;For bit 7 = 1, this is the byte
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;offset of the start of the buffer in
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;the file pointed to by buf_ID. Thus
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;the buffer starts at location
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;buf_offset in the file and contains
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;buf_fill bytes.
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BUFINSIZ EQU SIZE BUFFINFO
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; Size of structure in bytes
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buf_Free EQU 0FFh ; buf_id of free buffer
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;Flag byte masks
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buf_isnet EQU 10000000B
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buf_dirty EQU 01000000B
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;***
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buf_visit EQU 00100000B
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;***
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buf_snbuf EQU 00010000B
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buf_isDATA EQU 00001000B
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buf_isDIR EQU 00000100B
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buf_isFAT EQU 00000010B
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buf_type_0 EQU 11110001B ; AND sets type to "none"
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buf_NetID EQU BUFINSIZ
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; ;
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; C A V E A T P R O G R A M M E R ;
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;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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