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MS-DOS v2.0 Release
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Rich Turner
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v2.0/source/MSHEAD.ASM
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v2.0/source/MSHEAD.ASM
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; TITLE MSHEAD.ASM -- MS-DOS DEFINITIONS
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PAGE
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; MS-DOS High-performance operating system for the 8086 version 1.28
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; by Microsoft MSDOS development group:
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; Tim Paterson (Ret.)
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; Aaron Reynolds
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; Nancy Panners (Parenting)
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; Mark Zbikowski
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; Chris Peters (BIOS) (ret.)
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; ****************** Revision History *************************
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; >> EVERY change must noted below!! <<
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;
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; 0.34 12/29/80 General release, updating all past customers
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; 0.42 02/25/81 32-byte directory entries added
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; 0.56 03/23/81 Variable record and sector sizes
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; 0.60 03/27/81 Ctrl-C exit changes, including register save on user stack
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; 0.74 04/15/81 Recognize I/O devices with file names
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; 0.75 04/17/81 Improve and correct buffer handling
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; 0.76 04/23/81 Correct directory size when not 2^N entries
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; 0.80 04/27/81 Add console input without echo, Functions 7 & 8
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; 1.00 04/28/81 Renumber for general release
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; 1.01 05/12/81 Fix bug in `STORE'
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; 1.10 07/21/81 Fatal error trapping, NUL device, hidden files, date & time,
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; RENAME fix, general cleanup
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; 1.11 09/03/81 Don't set CURRENT BLOCK to 0 on open; fix SET FILE SIZE
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; 1.12 10/09/81 Zero high half of CURRENT BLOCK after all (CP/M programs don't)
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; 1.13 10/29/81 Fix classic "no write-through" error in buffer handling
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; 1.20 12/31/81 Add time to FCB; separate FAT from DPT; Kill SMALLDIR; Add
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; FLUSH and MAPDEV calls; allow disk mapping in DSKCHG; Lots
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; of smaller improvements
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; 1.21 01/06/82 HIGHMEM switch to run DOS in high memory
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; 1.22 01/12/82 Add VERIFY system call to enable/disable verify after write
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; 1.23 02/11/82 Add defaulting to parser; use variable escape character Don't
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; zero extent field in IBM version (back to 1.01!)
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; 1.24 03/01/82 Restore fcn. 27 to 1.0 level; add fcn. 28
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; 1.25 03/03/82 Put marker (00) at end of directory to speed searches
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; 1.26 03/03/82 Directory buffers searched as a circular queue, current buffer
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; is searched first when possible to minimize I/O
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; 03/03/82 STORE routine optimized to tack on partial sector tail as
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; full sector write when file is growing
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; 03/09/82 Multiple I/O buffers
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; 03/29/82 Two bugs: Delete all case resets search to start at beginning
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; of directory (infinite loop possible otherwise), DSKRESET
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; must invalidate all buffers (disk and directory).
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; 1.27 03/31/82 Installable device drivers
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; Function call 47 - Get pointer to device table list
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; Function call 48 - Assign CON AUX LIST
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; 04/01/82 Spooler interrupt (INT 28) added.
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; 1.28 04/15/82 DOS retructured to use ASSUMEs and PROC labels around system
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; call entries. Most CS relative references changed to SS
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; relative with an eye toward putting a portion of the DOS in
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; ROM. DOS source also broken into header, data and code pieces
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; 04/15/82 GETDMA and GETVECT calls added as 24 and 32. These calls
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; return the current values.
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; 04/15/82 INDOS flag implemented for interrupt processing along with
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; call to return flag location (call 29)
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; 04/15/82 Volume ID attribute added
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; 04/17/82 Changed ABORT return to user to a long ret from a long jump to
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; avoid a CS relative reference.
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; 04/17/82 Put call to STATCHK in dispatcher to catch ^C more often
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; 04/20/82 Added INT int_upooler into loop ^S wait
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; 04/22/82 Dynamic disk I/O buffer allocation and call to manage them
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; call 49.
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; 04/23/82 Added GETDSKPTDL as call 50, similar to GETFATPT(DL), returns
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; address of DPB
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; 04/29/82 Mod to WRTDEV to look for ^C or ^S at console input when
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; writting to console device via file I/O. Added a console
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; output attribute to devices.
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; 04/30/82 Call to en/dis able ^C check in dispatcher Call 51
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; 04/30/82 Code to allow assignment of func 1-12 to disk files as well
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; as devices.... pipes, redirection now possible
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; 04/30/82 Expanded GETLIST call to 2.0 standard
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; 05/04/82 Change to INT int_fatal_abort callout int HARDERR. DOS SS
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; (data segment) stashed in ES, INT int_fatal_abort routines must
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; preserve ES. This mod so HARDERR can be ROMed.
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; 1.29 06/01/82 Installable block and character devices as per 2.0 spec
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; 06/04/82 Fixed Bug in CLOSE regarding call to CHKFATWRT. It got left
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; out back about 1.27 or so (oops). ARR
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; 1.30 06/07/82 Directory sector buffering added to main DOS buffer queue
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; 1.40 06/15/82 Tree structured directories. XENIX Path Parser MKDIR CHDIR
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; RMDIR Xenix calls
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; 1.41 06/13/82 Made GETBUFFR call PLACEBUF
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; 1.50 06/17/82 FATs cached in buffer pool, get FAT pointer calls disappear
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; Frees up lots of memory.
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; 1.51 06/24/82 BREAKDOWN modified to do EXACT one sector read/write through
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; system buffers
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; 1.52 06/30/82 OPEN, CLOSE, READ, WRITE, DUP, DUP2, LSEEK implemented
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; 1.53 07/01/82 OPEN CLOSE mod for Xenix calls, saves and gets remote dir
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; 1.54 07/11/82 Function calls 1-12 make use of new 2.0 PDB. Init code
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; changed to set file handle environment.
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; 2.00 08/01/82 Number for IBM release
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; 01/19/83 No environ bug in EXEC
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; 01/19/83 MS-DOS OEM INT 21 extensions (SET_OEM_HANDLER)
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; 01/19/83 Performance bug fix in cooked write to NUL
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; 01/27/83 Growcnt fixed for 32-bits
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; 01/27/83 Find-first problem after create
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; 2.01 02/17/83 International DOS
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; 2.11 08/12/83 Dos split into several more modules for assembly on
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; an IBM PC
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;
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; *************************************************************
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SUBTTL EQUATES
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PAGE
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; Interrupt Entry Points:
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; INTBASE: ABORT
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; INTBASE+4: COMMAND
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; INTBASE+8: BASE EXIT ADDRESS
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; INTBASE+C: CONTROL-C ABORT
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; INTBASE+10H: FATAL ERROR ABORT
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; INTBASE+14H: BIOS DISK READ
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; INTBASE+18H: BIOS DISK WRITE
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; INTBASE+1CH: END BUT STAY RESIDENT (NOT SET BY DOS)
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; INTBASE+20H: SPOOLER INTERRUPT
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; INTBASE+40H: Long jump to CALL entry point
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ENTRYPOINTSEG EQU 0CH
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MAXDIF EQU 0FFFH
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SAVEXIT EQU 10
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INCLUDE DOSSYM.ASM
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INCLUDE DEVSYM.ASM
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SUBTTL ^C, terminate/abort/exit and Hard error actions
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PAGE
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;
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; There are three kinds of context resets that can occur during normal DOS
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; functioning: ^C trap, terminate/abort/exit, and Hard-disk error. These must
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; be handles in a clean fashion that allows nested executions along with the
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; ability to trap one's own errors.
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;
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; ^C trap - A process may elect to catch his own ^Cs. This is achieved by
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; using the $GET_INTERRUPT_VECTOR and $SET_INTERRUPT_VECTOR as
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; follows:
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;
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; $GET_INTERRUPT_VECTOR for INT int_ctrl_c
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; Save it in static memory.
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; $SET_INTERRUPT_VECTOR for INT int_ctrl_c
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;
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; The interrupt service routine must preserve all registers and
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; return carry set iff the operation is to be aborted (via abort
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; system call), otherwise, carry is reset and the operation is
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; restarted. ANY DEVIATION FROM THIS WILL LEAD TO UNRELIABLE
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; RESULTS.
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;
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; To restore original ^C processing (done on terminate/abort/exit),
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; restore INT int_ctrl_c from the saved vector.
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;
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; Hard-disk error -- The interrupt service routine for INT int_fatal_abort must
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; also preserve registers and return one of three values in AL: 0 and
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; 1 imply retry and ignore (???) and 2 indicates an abort. The user
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; himself is not to issue the abort, rather, the dos will do it for
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; him by simulating a normal abort/exit system call. ANY DEVIATION
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; FROM THIS WILL LEAD TO UNRELIABLE RESULTS.
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;
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; terminate/abort/exit -- The user may not, under any circumstances trap an
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; abort call. This is reserved for knowledgeable system programs.
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; ANY DEVIATION FROM THIS WILL LEAD TO UNRELIABLE RESULTS.
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SUBTTL SEGMENT DECLARATIONS
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PAGE
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; The following are all of the segments used. They are declared in the order
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; that they should be placed in the executable
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;
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; segment ordering for MSDOS
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;
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START SEGMENT BYTE PUBLIC 'START'
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START ENDS
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CONSTANTS SEGMENT BYTE PUBLIC 'CONST'
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CONSTANTS ENDS
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DATA SEGMENT WORD PUBLIC 'DATA'
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DATA ENDS
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CODE SEGMENT BYTE PUBLIC 'CODE'
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CODE ENDS
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LAST SEGMENT BYTE PUBLIC 'LAST'
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LAST ENDS
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DOSGROUP GROUP CODE,CONSTANTS,DATA,LAST
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; The following segment is defined such that the data/const classes appear
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; before the code class for ROMification
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START SEGMENT BYTE PUBLIC 'START'
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ASSUME CS:DOSGROUP,DS:NOTHING,ES:NOTHING,SS:NOTHING
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JMP DOSINIT
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START ENDS
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