162 lines
4.5 KiB
PHP
162 lines
4.5 KiB
PHP
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; SCCSID = @(#)dossym.asm 1.1 85/04/10
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; SCCSID = @(#)dossym.asm 1.1 85/04/10
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ERROR - who uses this? Not DOS and kernel. Whoever uses this
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should use DOSSYM instead. See JGL if there's a problem
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; PAGE 80,132
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TRUE EQU 0FFFFh
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FALSE EQU 0
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Installed = TRUE
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IFNDEF DEBUG
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DEBUG = FALSE
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ENDIF
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include dosmac.INC
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INCLUDE VERSIONA.INC ;DEFINE THE MAJOR AND MINOR VERSION NUMBERS
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IF2
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; %OUT DOSSYM in Pass 2
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ENDIF
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BREAK <Control character definitions>
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c_DEL EQU 7Fh ; ASCII rubout or delete previous char
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c_BS EQU 08h ; ^H ASCII backspace
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c_CR EQU 0Dh ; ^M ASCII carriage return
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c_LF EQU 0Ah ; ^J ASCII linefeed
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c_ETB EQU 17h ; ^W ASCII end of transmission
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c_NAK EQU 15h ; ^U ASCII negative acknowledge
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c_ETX EQU 03h ; ^C ASCII end of text
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c_HT EQU 09h ; ^I ASCII tab
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BREAK <Read This and Weep>
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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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; Certain structures, constants and system calls below are private to ;
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; the DOS and are extremely version-dependent. They may change at any ;
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; time at the implementors' whim. As a result, they must not be ;
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; documented to the general public. If an extreme case arises, they ;
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; must be documented with this warning. ;
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; ;
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; Those structures and constants that are subject to the above will be ;
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; marked and bracketed with the flag: ;
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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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;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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include bpb.INC
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include buffer.INC
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BREAK <User stack inside of system call and SysVars>
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; Location of user registers relative user stack pointer
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user_environ STRUC
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user_AX DW ?
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user_BX DW ?
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user_CX DW ?
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user_DX DW ?
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user_SI DW ?
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user_DI DW ?
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user_BP DW ?
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user_DS DW ?
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user_ES DW ?
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user_IP DW ?
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user_CS DW ?
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user_F DW ?
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user_environ ENDS
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include sysvar.INC
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include vector.INC
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;include mult.INC
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BREAK <Disk map>
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; MSDOS partitions the disk into 4 sections:
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;
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; phys sector 0: +-------------------+
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; | | boot/reserved |
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; | +-------------------+
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; | | File allocation |
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; v | table(s) |
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; | (multiple copies |
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; | are kept) |
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; +-------------------+
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; | Directory |
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; +-------------------+
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; | File space |
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; +-------------------+
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; | Unaddressable |
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; | (to end of disk) |
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; +-------------------+
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;
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; All partition boundaries are sector boundaries. The size of the FAT is
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; adjusted to maximize the file space addressable.
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include dirent.INC
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BREAK <File allocation Table information>
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;
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; The File Allocation Table uses a 12-bit entry for each allocation unit on
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; the disk. These entries are packed, two for every three bytes. The contents
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; of entry number N is found by 1) multiplying N by 1.5; 2) adding the result
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; to the base address of the Allocation Table; 3) fetching the 16-bit word
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; at this address; 4) If N was odd (so that N*1.5 was not an integer), shift
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; the word right four bits; 5) mask to 12 bits (AND with 0FFF hex). Entry
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; number zero is used as an end-of-file trap in the OS and is passed to the
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; BIOS to help determine disk format. Entry 1 is reserved for future use.
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; The first available allocation unit is assigned entry number two, and even
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; though it is the first, is called cluster 2. Entries greater than 0FF8H
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; (12-bit fats) or 0FFF8H (16-bit fats) are end of file marks; entries of zero
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; are unallocated. Otherwise, the contents of a FAT entry is the number of
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; the next cluster in the file.
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;
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; Clusters with bad sectors are tagged with FF7H. Any non-zero number would
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; do because these clusters show as allocated, but are not part of any
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; allocation chain and thus will never be allocated to a file. A particular
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; number is selected so that disk checking programs know what to do (ie. a
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; cluster with entry FF7H which is not in a chain is not an error).
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include dpb.INC
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include curdir.INC
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;include cpmfcb.INC
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;include find.INC
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include pdb.INC
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include exe.INC
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include sf.INC
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include arena.INC
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include intnat.INC
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include mi.INC
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fChk equ 1
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fDelim equ 2
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fSpChk equ 4
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fFCB equ 8
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;include filemode.INC
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;include error.INC
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include syscall.INC
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include doscntry.inc ;J.K. 5/26/86
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SUBTTL
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