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