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====== Mid early March work ======

**2025-03-16**

Only some updates to the lDOS kernel, and supporting tools. [[https://hg.pushbx.org/ecm/ldebug/rev/8b825d9ad3bd|One changeset from last week]] uploaded to the lDebug repo.


===== kernwrap =====

Add an option [[https://hg.pushbx.org/ecm/kernwrap/rev/533ec867cd80|to disable building]] of the version.com utility. This is needed to include the COM loader into ldos.com, which requires building version.com before this point.


===== tractest =====

Continuing the good tradition of including the kitchen sink of tools in this repo, I [[https://hg.pushbx.org/ecm/tractest/rev/4048acf0b339|added the provisionally named listvars.pl]]. It can list all code, proc, or data variables detected in a trace listing (.tls) file, including their section or group. It can also check that all immediate near or short branches seem to go into the same segment/group.

A second changeset [[https://hg.pushbx.org/ecm/tractest/rev/4a2b2d1910c9|fixes an error in the iscode function]]. Lacking the caret it could match instructions in the comment following a data directive, such as the comment on the ''MEDIA_SET_FOR_FORMAT'' variable that read "1 IF WE HAVE DONE AN INT 13 SET MEDIA" in which presumably "INT" was mismatched.

The plan is to re-introduce ASSUME directives into the lDOS kernel sources and use this script to check that the variable accesses agree with the assumptions.


===== lDOS kernel =====

  * Fill the COMPAT=ALTAH memory block [[https://hg.pushbx.org/ecm/msdos4/rev/2c1d19050aec|with a CCh byte pattern]].
  * Shrink the COMPAT=ALTAH block late in init [[https://hg.pushbx.org/ecm/msdos4/rev/2f8be91d41a9|to just the one needed paragraph]]. This re-uses msdos/msinit.nas's transfer_sysinitseg_to_doscode, and calls the memory.asm functions SplitMCB and ClearMCB,  which incidentally do not need their SS to point to the DOSDATA segment.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/84e2a1decd1f|Change 16-byte reservation]] in msbio2.nas to alignment.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/aafe1a6c025d|Move transfer_real13 to before DISKSECTOR]] in DOSENTRY section.
  * Shuffle some interrupt entries and [[https://hg.pushbx.org/ecm/msdos4/rev/dc1799704f1b|re-use the odd mmacro for anti-aligning]] to an odd byte boundary.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/c49704424901|Add entry to allocate_relocate_block]] that only succeeds if an UMB could be allocated, returns error otherwise.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/1418dbd5ef65|Delete commented out lDOS SFT and CDS relocation]].
  * [[https://hg.pushbx.org/ecm/msdos4/rev/30977998107d|Use lDOS extended allocation strategy]] rather than changing the UMB link status.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/fc87a9ff7ae8|Extract the function relocate_dosdata]].
  * Update relocate_dosdata [[https://hg.pushbx.org/ecm/msdos4/rev/ec07cfb1759a|to allow repeated call]] and entry that only relocates if an UMB is available. Also re-use allocate_relocate_block (both entries).
  * [[https://hg.pushbx.org/ecm/msdos4/rev/abbef079db77|Drop outdated comment]] on relocate_dosdata, it now preserves the memory allocation strategy.
  * In DOSREINIT updaate the [[https://hg.pushbx.org/ecm/msdos4/rev/15eea5f2aa0f|sysinit's dosinfo]] and [[https://hg.pushbx.org/ecm/msdos4/rev/487b16c92c39|SYSI_Country variables]], needed for early DOSDATA relocation before the last uses of these.
  * In sysinit1.nas [[https://hg.pushbx.org/ecm/msdos4/rev/93ec3c387de7|disable the checksumming of SYSINIT]] after INSTALL= returns.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/9a41a05b7a20|Implement]] COMPAT=DOSDATAFIRST (immediately relocate after COMPAT=ALTAH allocation, before any further configuration processing and particularly before any DEVICE= directives), and COMPAT=DOSDATAEARLY (relocate to the UMA after any DEVICE= directive that makes available a sufficient UMB, if no UMB found then relocate after INSTALL= as before).
  * In init.asm [[https://hg.pushbx.org/ecm/msdos4/rev/8024373ec624|call the early relocate_dosdata after linking in new UMBs]], so DOSDATA gets the very first UMB allocation rather than the second.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/5efaf4a96c9c|Split the ENTRY_POINT variable]] from FINAL_DOS_LOCATION, and [[https://hg.pushbx.org/ecm/msdos4/rev/6d7f4fefd330|rename the latter to behind_dosentry_segment]] as it is now the position of the free MCB, not that of the DOS (data) segment.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/e5588a83ab22|Delete dos_size variable]].
  * [[https://hg.pushbx.org/ecm/msdos4/rev/038703842099|Relocate SFT owners]] before relocate_psp_late's process termination. Includes comments on the abort.nas "Scan" loop that differs in MS-DOS v5. This change fixes deallocation of the CON handles during the PSP relocation.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/3c92531e613f|Support INSTALLLAST= config directive]].
  * [[https://hg.pushbx.org/ecm/msdos4/rev/33f8c6bb5de0|Add makinst.sh]] from [[https://hg.pushbx.org/ecm/msdos4/rev/8b825d9ad3bd|lDebug]].
  * [[https://hg.pushbx.org/ecm/msdos4/rev/c0bb96da7c3c|Enable building]] instsect.com
  * If mak.sh called from update dl script, [[https://hg.pushbx.org/ecm/msdos4/rev/3de73453890b|call makinst.sh and itself]].
  * Rename second payload of ldos.com [[https://hg.pushbx.org/ecm/msdos4/rev/e5b6fcdb7ea4|to payload2.com]]
  * [[https://hg.pushbx.org/ecm/msdos4/rev/91015c34098d|Build instsect first]] in mak.sh update dl script path.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/bed354ee9d9b|Add comload.asm]] from [[https://hg.pushbx.org/ecm/ldos/rev/4091fac59e21|old lDOS repo]].
  * Adapt COM loader [[https://hg.pushbx.org/ecm/msdos4/rev/cdd11ee3d7ca|for use as second payload executable]].
  * In COM loader [[https://hg.pushbx.org/ecm/msdos4/rev/993866d2cc8a|run VERSION command program]] if empty command line given (compatible to old ldos.com / edrdos.com).
  * [[https://hg.pushbx.org/ecm/msdos4/rev/25c1533dce7b|Do not display the COM loader header]] for VERSION command.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/7222dbcff067|Initial commit]] of the lDOS kernel manual.
  * In msioctl.nas [[https://hg.pushbx.org/ecm/msdos4/rev/0b18a7b9b46d|address the DISKSECTOR]] using DOSENTRY segment.
  * In msbio/msdisk.nas [[https://hg.pushbx.org/ecm/msdos4/rev/e5b64c9aa390|bounce HMA access]] through the DOSENTRY disk sector.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/44fe51e6ad11|Make HMA bouncing configurable]] using COMPAT= options.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/6fcd065a4b71|Document HMA bouncing options]].
  * Implement [[https://hg.pushbx.org/ecm/msdos4/rev/bf419cf2682f|HMA bouncing auto detection]] on nonremovable DOS-internal drives. This requires use of a buffer in the HMA that exactly maps to the disk sector buffer in DOSENTRY if addressed with A20 off. To avoid allocating this buffer permanently, it is used directly after allocating the HMA from the XMS driver, before DOSCODE is installed into it.
  * In exec.nas [[https://hg.pushbx.org/ecm/msdos4/rev/8e6c44f4ab24|do not free the memory block at segment 8]] on program memory block allocation failure. Further description and a test script in the changeset message.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/90bc9452be48|Shrink config block]] after ORGANIZE call.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/34179a8a0d9d|Extract get_config_size function]].
  * [[https://hg.pushbx.org/ecm/msdos4/rev/abc58058432a|Relocate config block]] (two steps each) before INSTALL= and INSTALLLAST= directives are run.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/fe1d4092f38d|Extend parts covered by InDOS flag in i21 handler]]. This helps the debugger if run without its "Force InDOS" mode. This led to returning error 2 on exec rather than the expected error 8.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/923db94d0090|Document auto bounce detection]] options.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/79465478435d|Avoid an empty TEXT section]] in msbio1.nas
  * [[https://hg.pushbx.org/ecm/msdos4/rev/8d36a20f69fe|Delete the CODE section]].
  * [[https://hg.pushbx.org/ecm/msdos4/rev/75069bd9d8ca|Add a group called DOSENTRYGROUP]] for the DOSENTRY section.
  * Rename some functions to avoid clashes with functions in other files:
    * [[https://hg.pushbx.org/ecm/msdos4/rev/6f91515e185a|sysinit_DiddleBack]]
    * [[https://hg.pushbx.org/ecm/msdos4/rev/3fccf3ec1cc6|init2 MCB functions]]
    * [[https://hg.pushbx.org/ecm/msdos4/rev/6577234ef2b9|Several more]]
  * [[https://hg.pushbx.org/ecm/msdos4/rev/577ed9a05837|Fix a typo in a label name]] in ctrlc.nas
  * [[https://hg.pushbx.org/ecm/msdos4/rev/dab4d4cd42c5|Update some assume directives]] to prepare for listvars.pl new functionality.
  * msbio/msdisk.nas: [[https://hg.pushbx.org/ecm/msdos4/rev/254b0694ffec|Address some variables correctly]] using DOSDATA segment (not DOSENTRY).
  * [[https://hg.pushbx.org/ecm/msdos4/rev/5f5d32319965|Update more]] assume directives.
  * In read_sector [[https://hg.pushbx.org/ecm/msdos4/rev/32c153f4dff9|access some more variables using DOSDATA segment]], not DOSENTRY.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/0f207b9768a4|Update yet more]] assume directives.
  * [[https://hg.pushbx.org/ecm/msdos4/rev/f8ff0bc5b0c9|Fix to not push ds before diskio_lba_retry]]. This is not needed because lba_packet_setup already sets up the DS register, and is wrong because the branch back to diskio_lba_retry didn't push DS the same way.
  * In macro2.nas function TransFCB [[https://hg.pushbx.org/ecm/msdos4/rev/26182f82e447|do not misalign the stack]] (round up 15-byte local buffer variable to 16 bytes instead).
  * [[https://hg.pushbx.org/ecm/msdos4/rev/09ef6c2d7c8c|Correct a few assume directives]].
  * Fix in mscon.nas's CHRIN function [[https://hg.pushbx.org/ecm/msdos4/rev/4a79c4d6b1a3|to reset DS first]].


{{tag>ldebug kernwrap tractest listvars.pl ldos bounce}}


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