77 lines
2.2 KiB
PHP
77 lines
2.2 KiB
PHP
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BREAK <Disk I/O Buffer Header>
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;** BUFFER.INC
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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_next DW ? ; Pointer to next buffer in list
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buf_prev DW ? ; Pointer to prev 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 DD ? ; 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 DW ? ; " " " , # 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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buf_reserved DB ? ; make DWORD boundary for 386
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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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; Buffer Hash Entry Structure
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;
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;BUFFER_HASH_ENTRY STRUC ; DOS 4.00
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;EMS_PAGE_NUM DW -1 ; logical page number for EMS handle
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;BUFFER_BUCKET DD ? ; pointer to buffers
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;DIRTY_COUNT DB 0 ; number of dirty buffers
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;BUFFER_RESERVED DB 0 ; reserved
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;BUFFER_HASH_ENTRY ENDS
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;
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;MaxBuffinBucket EQU 15 ; Max number of buffers per bucket
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;MaxBucketinPage EQU 2 ; Max number of buckets per 16kb page
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;
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;
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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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