261 lines
8.5 KiB
PHP
261 lines
8.5 KiB
PHP
; mdequ.inc -- MagicDrv general equate file
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;/*
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; * Microsoft Confidential
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; * Copyright (C) Microsoft Corporation 1992
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; * All Rights Reserved.
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; */
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; History:
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;
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; 20-Jul-1992 chuckst initial version
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;
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;CODE_CSUM_SNAP equ 0ffffh ; defined: save image of code on csum err
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; Now that CSUM is the default, the build won't work without
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; POPUP being true. However, I'm leaving the POPUP conditionals
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; in to help identify that code, just in case we ever want to
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; remove it and let CSUM faults simply hang.
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POPUP = 0ffffh
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ifdef DEBUG
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POPUP = 0ffffh ; POPUPs mandatory for DEBUG build
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endif
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; Define the following variable to generate the standalone
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; version of DBLSPACE.BIN, which loads as a device driver under
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; MS-DOS 5.0 or greater.
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;
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;STANDALONE equ 0ffffh
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switch_n equ 0001h
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switch_f equ 0002h
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fatal_error_0 equ 0 ; re-entered at strat
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fatal_error_1 equ 1 ; irpt without 1 strat
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fatal_error_2 equ 2 ; 2 irpts per strat
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fatal_error_3 equ 3 ; get_sqztor, number too low
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fatal_error_4 equ 4 ; put_sqztor, number too low
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fatal_error_5 equ 5 ; get_sqztor, number too high
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fatal_error_6 equ 6 ; put_sqztor, number too high
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fatal_error_7 equ 7 ; DOS system I/O too high
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fatal_error_8 equ 8 ; DOS system I/O too low
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fatal_error_9 equ 9 ; HEAP I/O too high
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fatal_error_10 equ 10 ; HEAP I/O too low
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fatal_error_11 equ 11 ; BITFAT I/O too high
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fatal_error_12 equ 12 ; BITFAT I/O too low
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fatal_error_13 equ 13 ; MDFAT I/O too high
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fatal_error_14 equ 14 ; MDFAT I/O too low
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fatal_error_15 equ 15 ; Bad signature check on CVF fragment list
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fatal_error_16 equ 16 ; Invalid int2f subfn (for forcing popup)
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fatal_error_17 equ 17 ; free to free sqztor
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fatal_error_18 equ 18 ; unfree to used sqztor
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fatal_error_19 equ 19 ; bitfat memory corrupt
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fatal_error_20 equ 20 ; mdfat memory corrupt
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fatal_error_21 equ 21 ; file fragment list corrupt
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fatal_error_22 equ 22 ; code block corrupt
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fatal_error_23 equ 23 ; write to invalid BitFAT page (0f0h)
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fatal_error_24 equ 24 ; DBLSPACE.BIN stack overrun
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CSUM_CODE equ 1
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CSUM_FFLIST equ 2
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CSUM_BFAT_USE equ 4
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CSUM_BFAT_WRITE equ 8
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CSUM_BFAT equ CSUM_BFAT_USE+CSUM_BFAT_WRITE
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CSUM_MDFAT_USE equ 16
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CSUM_MDFAT_WRITE equ 32
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CSUM_MDFAT equ CSUM_MDFAT_USE+CSUM_MDFAT_WRITE
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CSUM_STACK_CHK equ 64 ; Set => check for stack overrun
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CSUM_ALL equ CSUM_CODE+CSUM_FFLIST+CSUM_BFAT+CSUM_MDFAT+CSUM_STACK_CHK
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CSUM_XOR equ 4fd0h ; this value is XOR'd with all internal
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; ; data structure words before the checksum
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; ; is performed. This is because of the
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; ; fact that 0ffffh is minus 0 in one's
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; ; complement, and thus the checksum would
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; ; not detect 0s changing to 0ffffhs, and
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; ; vice versa. By doing this XOR, we map
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; ; the two 'identical' values to 4fd0h and
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; ; 0b02fh, which are much less likely to
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; ; occur. Only a trashing bug which did
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; ; a properly aligned NOT function on one
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; ; of these two words would not be detected.
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CODE_CSUM_INTERVAL equ 10 ; checksum code one out of this many
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; ; times driver is entered.
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;;
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;; Equates
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;;
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multMagicdrv equ 4a11h ; Int2f multiplex number
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DRVMAP_CPR_BIT equ 80h ; bit indicating mounted CVF in drv_map array
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cr = 13
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lf = 10
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tab = 9
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ctrlz = 1ah
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CVF_SEQ_SWAP equ 0 ; Sequence number which implies SWAP
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CVF_SEQ_MAX equ 255 ; Maximum allowable sequence number
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MAX_ACTIVATES equ 24 ; 26 drive letters, less two floppies
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BIG_CLUSTER equ 8192 ;Size of BIG cluster (8K)
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SMALL_CLUSTER equ 4096 ;Size of SMALL cluster (4K)
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BPTR equ BYTE PTR
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MAX_FULL equ 32 ;;64;Minimum of free sectors b4 we declare this disk as full
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MAX_WARN equ 256 ;Minimum free sectors to generate an 'almost full' warning
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;; temp_buf_list values
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ORIGINAL_DATA equ 1 ;This sector has an original data
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NEW_DATA equ 2 ;This sector contains new data
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MAX_DEMO_HIWORD_SIZE equ 48 ;Maximum high word for demo file
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MAX_SECTOR_SIZE equ 2048 ;Maximum host sector size (2K)
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IO_PART_SPACE equ 2048 ;Page size for sqztor table
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PART_CLUSTER_SIZE_POW2 equ 9 ;How many clusters per one page (DWORD per cluster)
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BIT_FAT_SPACE equ 2048 ;Page size of sec_list table (free space)
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SECTORS_PER_BIT_FAT_POW2 equ 14 ;In power 2 if sectors
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SECTORS_PER_BIT_FAT equ 16384 ;Number of bits (sectors) in one page
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DBL_SIGN equ 0 ;Where the 'DBL' signature can be located
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VOL_STAMP equ 6 ;Where unique vol stamp is found
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RETRACT_SIGNATURE equ 1 ; signature is last full sector, ie:
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; ; end of file (rounded down to sector)
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; ; minus 1
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RH equ ds:[bx] ;Addressability to Request Header structure
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MAX_DISK_UNITS equ 15 ;Maximumm of extended disk we can handle
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cMINFILEFRAGMENTS equ 50 ;Minimum file fragment heap size
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cDEFFILEFRAGMENTS equ 700 ;Default " " " "
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cMAXFILEFRAGMENTS equ 10000 ;Maximum " " " "
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; cluster_to_Sqztor equates. See globals definition
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NO_FLAGS_MASK equ 001FH ;Just the entry, without flags
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RESERVED1_MASK equ 0020H ;Reserved bit just after 21-bit sector#
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PHYSICAL_SIZE_MASK equ 03C0H ;Only the physical size bits
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PHYSICAL_SIZE_OFFSET equ 6 ;THe physical size bits offset
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PLAINTEXT_MASK equ 3C00H ;Only the plaintext size bits
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PLAINTEXT_OFFSET equ 10 ;Plaintext size bits offset
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UNCODED_CLUSTER_MASK equ 4000H ;Uncompress cluster bit
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USED_CLUSTER_MASK equ 8000H ;Used cluster bit
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PARA_SIZE_POW2 equ 4 ;Number of bytes in one 8088 paragraph
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STACK_SIZE equ 768 ;Size of our stack
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; Device driver equates
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READ_DISK_CMD equ 4
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WRITE_DISK_CMD equ 8
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WRITE_VERIFY_CMD equ 9
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STAT_WRITP equ 8000H ;Write protect violation
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STAT_DFULL equ 8027h ;Disk full error
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STAT_NRDY equ 8002H ;Device not ready
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STAT_NOCOM equ 8003H ;Unkown command
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STAT_CRC equ 8004H ;CRC error
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STAT_SNF equ 8008H ;sector not found error
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STAT_SEEK equ 8006H ;Seek error
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STAT_WRITE equ 800AH ;Write FAULT
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STAT_READ equ 800BH ;Read fault
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STAT_GEN equ 800CH ;General failore
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DOS EQU 21H ;DOS request INT
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DOS_PCHR EQU 02H ;print character function
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;Constants for compression/Decompression alg.
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MAX_BITS equ 12 ;Maximum bits (2048 entries)
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TABLESIZE equ 2048 ;Hash table size
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SPECIAL_EOS equ 4415 ;End of Sector code
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;Generic IOCTL return codes
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NO_ERROR equ 0 ;No error
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LETTER_BOUNDRY_ERROR equ 1 ;Letter out of bounds
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UNIT_USED_ERROR equ 2 ;Unit already used
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NO_FREE_SLOT_ERROR equ 3 ;No reserved slot available
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STAMP_ERROR equ 4 ;Stamp error on extended disk
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;Cluster signature
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;Compressed clusters has the signature:
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; 44 53 00 00 - Cluster compressed real time
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; 44 53 00 01 - Cluster SuperCompressed offline
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; 44 53 00 02 - Cluster XCompressed real time
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;
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; NOTE: If you load these signature as words, they look like:
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;
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; low word = 5344h
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; high word = 0000h or 0100h
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; XCMP defines a different REAL_TIME_COMPRESSED signature so a XCMP and
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; non XCMP driver can be used on the same CVF and not get confused trying
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; to UpdateCompress a XCMP block (XCMP does not support UpdateCompress).
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SIG_SIZE equ 4 ; 4 byte signature
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STANDARD_COMPRESSED equ 0000h ; High word of stamp
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SUPER_COMPRESSED equ 0100h ; High word of stamp
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X_COMPRESSED equ 0200h ; High word of stamp
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REAL_TIME_COMPRESSED equ X_COMPRESSED ; Stamp used for real-time compress
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;;
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;; We always keep at least 64k of extra sqztors around so a
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;; file overwrite won't expand to more sqztors that are available.
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;; Of course this is a raw heuristic since these should also
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;; be contingous. For more info, see dospatch.asm and
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;; low_dlb.asm referenece to FUDGESTOR
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FUDGESTOR equ 128
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; eXperimental compression code uses a lookup table to find past
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; occurances of individual characters. The table is currently
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; 256 rows (1 for each possible byte value) X N (tracks N occurances
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; of each character).
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cltROWS EQU 256 ; lookup table 256 rows x
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cltCOLS EQU 8 ; N columns
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ifdef POPUP
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PUP_FILE_SIZE equ 20*1024
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MAX_PUP_FRAGLIST equ 6*(1+PUP_FILE_SIZE/1024) ; support >=1K clusters
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PUP_QUEUE_SIZE equ 4096
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endif
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; mcsNONE indicates there is no saved Media Check status. This value
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; must not be equated to a valid media check result (-1, 0, 1).
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mcsNONE equ 80h
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; cAM_HOOKS is the number of block device drivers that can be hooked
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; by the automount code. Each hook adds approx 30 bytes, so keeping
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; this value low is significant. A MS-DOS 6 system that does not
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; load additional block device driver in config.sys uses 1 hook (A:,
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; B:, C:, ... are all serviced by one device driver).
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cAM_HOOKS equ 5
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para_adjust equ -16 ; we'll add this to certain vars
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; ; in the automount device headers
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; ; and related variables when we
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; ; access them with low_stub_seg+1,
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; ; to work around a Norton SpeeDrv bug.
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STACK_GUARD_VALUE equ 1234h ; unlikely value to use when checking
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; for stack overrun
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