mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
178 lines
6.0 KiB
178 lines
6.0 KiB
; PAGE 80,132
|
|
.xall
|
|
|
|
; Revision History:
|
|
;
|
|
; M003 - added A20OFF_FLAG for MS PASCAL 3.2 compatibility support
|
|
; for DOS5.X running in HMA.
|
|
;
|
|
; M004 - added bit definition SETSSSP for DOS_FLAG for supporting
|
|
; exe files without stack segment.
|
|
; This is no longer needed as we modify SP only. Removing
|
|
; this equate. 9/26/90
|
|
;
|
|
; M009 - addded comments relating to mace mkeyrate ver 1.0 support
|
|
; with DOS in HMA.
|
|
;
|
|
; M025 - Added SWITCHES=/W for suppressing mandatory loading
|
|
; of WINA20.386
|
|
;
|
|
; M027 - Support for copy protected apps. Defined bit 2 of DOS_FLAG
|
|
;
|
|
|
|
TRUE EQU 0FFFFh
|
|
FALSE EQU 0
|
|
|
|
Installed = TRUE
|
|
IFNDEF DEBUG
|
|
DEBUG = FALSE
|
|
ENDIF
|
|
|
|
include dbcs.sw
|
|
include dosmac.INC
|
|
include VERSIONA.INC
|
|
include VERSION.INC
|
|
|
|
|
|
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>
|
|
|
|
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 ? ; 00 hex offsets to
|
|
user_BX DW ? ; 02 facilitate debugging
|
|
user_CX DW ? ; 04
|
|
user_DX DW ? ; 06
|
|
user_SI DW ? ; 08
|
|
user_DI DW ? ; 0A
|
|
user_BP DW ? ; 0C
|
|
user_DS DW ? ; 0E
|
|
user_ES DW ? ; 10
|
|
user_IP DW ? ; 12
|
|
user_CS DW ? ; 14
|
|
user_F DW ? ; 16
|
|
user_environ ENDS
|
|
|
|
|
|
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).
|
|
|
|
|
|
|
|
|
|
;** Character Type Flags
|
|
;
|
|
; These flags are used in a lookup table indexed by the character code.
|
|
; They're used to quickly classify characters when parsing paths.
|
|
; I think that these are only used to parse FCBs - jgl
|
|
|
|
FCHK equ 1 ; I think this means "normal name char, no chks needed" -jgl
|
|
FDELIM equ 2 ; is a delimiter
|
|
FSPCHK equ 4 ; set if character is not a space or equivalent
|
|
FFCB equ 8 ; is valid in an FCB
|
|
|
|
|
|
include error.INC
|
|
|
|
;** Bit definitions for DOS_FLAG
|
|
;
|
|
; Bit 0 - this is set when a $open call is made from $exec. This is used in
|
|
; $open to indicate to the redirector that this open is being made
|
|
; by an exec call.
|
|
;
|
|
; Bit 2
|
|
;
|
|
; M003, M027:
|
|
;
|
|
; The start up code of MS PASCAL 3.2 programs depend on the 1M address wrap
|
|
; if they load below 64K. This is a likely possiblity in DOS 5.x with DOS in
|
|
; the HMA. By default DOS will turn A20 OFF before Xferring control to the
|
|
; user program in the case of an Exec call. The next call to DOS will turn
|
|
; A20 line ON. It has been observed that MS PASCAL 3.2 start up does an int
|
|
; 21 ah=25h call before executing the faulty code. This will turn A20 On.
|
|
; In order to support this we will set Bit 2 of this flag in the DOS exec
|
|
; call (msproc.asm) if DOS is running in the HMA. In $set_interrupt_vector in
|
|
; getset.asm A20OFF_COUNT is set to 1 if bit 2 of DOS_FLAG was previously set
|
|
; by a call to exec and if A20OFF_COUNT is 0. In msdisp.asm, if A20OFF_COUNT
|
|
; is non zero then A20 will be turned OFF before returning to the user.
|
|
; Bit 2 will be unconditionally cleared here.
|
|
;
|
|
; M009, M027:
|
|
;
|
|
; Mace utilities MKEYRATE.COM version 1.0 copyright 1987 is an execpacked
|
|
; program converted to a com file. Therefore if DOS is loaded high and if
|
|
; this program is loaded below 64K it will blurt out "packed file is corrupt".
|
|
; This program does an int 21 ah=49h before executing the buggy execpacked
|
|
; code. This int21 call turns a20 on and hence the problem. In $dealloc
|
|
; alloc.asm A20OFF_COUNT is set to 1 if bit 2 of DOS_FLAG was previously set
|
|
; by a call to exec and if A20OFF_COUNT is 0. In msdisp.asm, if A20OFF_COUNT
|
|
; is non zero then A20 will be turned OFF before returning to the user.
|
|
; Bit 2 will be unconditionally cleared here.
|
|
;
|
|
;
|
|
;
|
|
|
|
EXECOPEN EQU 00000001b ; bit 0 of DOS_FLAG
|
|
SUPPRESS_WINA20 EQU 00000010b ; M025
|
|
EXECA20OFF EQU 00000100b ; bit 2 of DOS_FLAG
|
|
|
|
|
|
|