From 80ab2fddfdf30f09f0a0a637654cbb3cd5c7baa6 Mon Sep 17 00:00:00 2001 From: Rich Turner Date: Fri, 12 Aug 1983 17:53:34 -0700 Subject: MS-DOS v2.0 Release --- v2.0/source/MSHEAD.ASM | 198 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 198 insertions(+) create mode 100644 v2.0/source/MSHEAD.ASM (limited to 'v2.0/source/MSHEAD.ASM') diff --git a/v2.0/source/MSHEAD.ASM b/v2.0/source/MSHEAD.ASM new file mode 100644 index 0000000..108197d --- /dev/null +++ b/v2.0/source/MSHEAD.ASM @@ -0,0 +1,198 @@ +; TITLE MSHEAD.ASM -- MS-DOS DEFINITIONS +PAGE +; MS-DOS High-performance operating system for the 8086 version 1.28 +; by Microsoft MSDOS development group: +; Tim Paterson (Ret.) +; Aaron Reynolds +; Nancy Panners (Parenting) +; Mark Zbikowski +; Chris Peters (BIOS) (ret.) + +; ****************** Revision History ************************* +; >> EVERY change must noted below!! << +; +; 0.34 12/29/80 General release, updating all past customers +; 0.42 02/25/81 32-byte directory entries added +; 0.56 03/23/81 Variable record and sector sizes +; 0.60 03/27/81 Ctrl-C exit changes, including register save on user stack +; 0.74 04/15/81 Recognize I/O devices with file names +; 0.75 04/17/81 Improve and correct buffer handling +; 0.76 04/23/81 Correct directory size when not 2^N entries +; 0.80 04/27/81 Add console input without echo, Functions 7 & 8 +; 1.00 04/28/81 Renumber for general release +; 1.01 05/12/81 Fix bug in `STORE' +; 1.10 07/21/81 Fatal error trapping, NUL device, hidden files, date & time, +; RENAME fix, general cleanup +; 1.11 09/03/81 Don't set CURRENT BLOCK to 0 on open; fix SET FILE SIZE +; 1.12 10/09/81 Zero high half of CURRENT BLOCK after all (CP/M programs don't) +; 1.13 10/29/81 Fix classic "no write-through" error in buffer handling +; 1.20 12/31/81 Add time to FCB; separate FAT from DPT; Kill SMALLDIR; Add +; FLUSH and MAPDEV calls; allow disk mapping in DSKCHG; Lots +; of smaller improvements +; 1.21 01/06/82 HIGHMEM switch to run DOS in high memory +; 1.22 01/12/82 Add VERIFY system call to enable/disable verify after write +; 1.23 02/11/82 Add defaulting to parser; use variable escape character Don't +; zero extent field in IBM version (back to 1.01!) +; 1.24 03/01/82 Restore fcn. 27 to 1.0 level; add fcn. 28 +; 1.25 03/03/82 Put marker (00) at end of directory to speed searches +; 1.26 03/03/82 Directory buffers searched as a circular queue, current buffer +; is searched first when possible to minimize I/O +; 03/03/82 STORE routine optimized to tack on partial sector tail as +; full sector write when file is growing +; 03/09/82 Multiple I/O buffers +; 03/29/82 Two bugs: Delete all case resets search to start at beginning +; of directory (infinite loop possible otherwise), DSKRESET +; must invalidate all buffers (disk and directory). +; 1.27 03/31/82 Installable device drivers +; Function call 47 - Get pointer to device table list +; Function call 48 - Assign CON AUX LIST +; 04/01/82 Spooler interrupt (INT 28) added. +; 1.28 04/15/82 DOS retructured to use ASSUMEs and PROC labels around system +; call entries. Most CS relative references changed to SS +; relative with an eye toward putting a portion of the DOS in +; ROM. DOS source also broken into header, data and code pieces +; 04/15/82 GETDMA and GETVECT calls added as 24 and 32. These calls +; return the current values. +; 04/15/82 INDOS flag implemented for interrupt processing along with +; call to return flag location (call 29) +; 04/15/82 Volume ID attribute added +; 04/17/82 Changed ABORT return to user to a long ret from a long jump to +; avoid a CS relative reference. +; 04/17/82 Put call to STATCHK in dispatcher to catch ^C more often +; 04/20/82 Added INT int_upooler into loop ^S wait +; 04/22/82 Dynamic disk I/O buffer allocation and call to manage them +; call 49. +; 04/23/82 Added GETDSKPTDL as call 50, similar to GETFATPT(DL), returns +; address of DPB +; 04/29/82 Mod to WRTDEV to look for ^C or ^S at console input when +; writting to console device via file I/O. Added a console +; output attribute to devices. +; 04/30/82 Call to en/dis able ^C check in dispatcher Call 51 +; 04/30/82 Code to allow assignment of func 1-12 to disk files as well +; as devices.... pipes, redirection now possible +; 04/30/82 Expanded GETLIST call to 2.0 standard +; 05/04/82 Change to INT int_fatal_abort callout int HARDERR. DOS SS +; (data segment) stashed in ES, INT int_fatal_abort routines must +; preserve ES. This mod so HARDERR can be ROMed. +; 1.29 06/01/82 Installable block and character devices as per 2.0 spec +; 06/04/82 Fixed Bug in CLOSE regarding call to CHKFATWRT. It got left +; out back about 1.27 or so (oops). ARR +; 1.30 06/07/82 Directory sector buffering added to main DOS buffer queue +; 1.40 06/15/82 Tree structured directories. XENIX Path Parser MKDIR CHDIR +; RMDIR Xenix calls +; 1.41 06/13/82 Made GETBUFFR call PLACEBUF +; 1.50 06/17/82 FATs cached in buffer pool, get FAT pointer calls disappear +; Frees up lots of memory. +; 1.51 06/24/82 BREAKDOWN modified to do EXACT one sector read/write through +; system buffers +; 1.52 06/30/82 OPEN, CLOSE, READ, WRITE, DUP, DUP2, LSEEK implemented +; 1.53 07/01/82 OPEN CLOSE mod for Xenix calls, saves and gets remote dir +; 1.54 07/11/82 Function calls 1-12 make use of new 2.0 PDB. Init code +; changed to set file handle environment. +; 2.00 08/01/82 Number for IBM release +; 01/19/83 No environ bug in EXEC +; 01/19/83 MS-DOS OEM INT 21 extensions (SET_OEM_HANDLER) +; 01/19/83 Performance bug fix in cooked write to NUL +; 01/27/83 Growcnt fixed for 32-bits +; 01/27/83 Find-first problem after create +; 2.01 02/17/83 International DOS +; 2.11 08/12/83 Dos split into several more modules for assembly on +; an IBM PC +; +; ************************************************************* + + +SUBTTL EQUATES +PAGE +; Interrupt Entry Points: + +; INTBASE: ABORT +; INTBASE+4: COMMAND +; INTBASE+8: BASE EXIT ADDRESS +; INTBASE+C: CONTROL-C ABORT +; INTBASE+10H: FATAL ERROR ABORT +; INTBASE+14H: BIOS DISK READ +; INTBASE+18H: BIOS DISK WRITE +; INTBASE+1CH: END BUT STAY RESIDENT (NOT SET BY DOS) +; INTBASE+20H: SPOOLER INTERRUPT +; INTBASE+40H: Long jump to CALL entry point + +ENTRYPOINTSEG EQU 0CH +MAXDIF EQU 0FFFH +SAVEXIT EQU 10 + + INCLUDE DOSSYM.ASM + INCLUDE DEVSYM.ASM + +SUBTTL ^C, terminate/abort/exit and Hard error actions +PAGE +; +; There are three kinds of context resets that can occur during normal DOS +; functioning: ^C trap, terminate/abort/exit, and Hard-disk error. These must +; be handles in a clean fashion that allows nested executions along with the +; ability to trap one's own errors. +; +; ^C trap - A process may elect to catch his own ^Cs. This is achieved by +; using the $GET_INTERRUPT_VECTOR and $SET_INTERRUPT_VECTOR as +; follows: +; +; $GET_INTERRUPT_VECTOR for INT int_ctrl_c +; Save it in static memory. +; $SET_INTERRUPT_VECTOR for INT int_ctrl_c +; +; The interrupt service routine must preserve all registers and +; return carry set iff the operation is to be aborted (via abort +; system call), otherwise, carry is reset and the operation is +; restarted. ANY DEVIATION FROM THIS WILL LEAD TO UNRELIABLE +; RESULTS. +; +; To restore original ^C processing (done on terminate/abort/exit), +; restore INT int_ctrl_c from the saved vector. +; +; Hard-disk error -- The interrupt service routine for INT int_fatal_abort must +; also preserve registers and return one of three values in AL: 0 and +; 1 imply retry and ignore (???) and 2 indicates an abort. The user +; himself is not to issue the abort, rather, the dos will do it for +; him by simulating a normal abort/exit system call. ANY DEVIATION +; FROM THIS WILL LEAD TO UNRELIABLE RESULTS. +; +; terminate/abort/exit -- The user may not, under any circumstances trap an +; abort call. This is reserved for knowledgeable system programs. +; ANY DEVIATION FROM THIS WILL LEAD TO UNRELIABLE RESULTS. + +SUBTTL SEGMENT DECLARATIONS +PAGE + +; The following are all of the segments used. They are declared in the order +; that they should be placed in the executable + +; +; segment ordering for MSDOS +; + +START SEGMENT BYTE PUBLIC 'START' +START ENDS + +CONSTANTS SEGMENT BYTE PUBLIC 'CONST' +CONSTANTS ENDS + +DATA SEGMENT WORD PUBLIC 'DATA' +DATA ENDS + +CODE SEGMENT BYTE PUBLIC 'CODE' +CODE ENDS + +LAST SEGMENT BYTE PUBLIC 'LAST' +LAST ENDS + +DOSGROUP GROUP CODE,CONSTANTS,DATA,LAST + +; The following segment is defined such that the data/const classes appear +; before the code class for ROMification + +START SEGMENT BYTE PUBLIC 'START' + ASSUME CS:DOSGROUP,DS:NOTHING,ES:NOTHING,SS:NOTHING + JMP DOSINIT +START ENDS + + \ No newline at end of file -- cgit v1.2.3