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dev: growing this into the Zone OS project

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The scope of this project is growing, mostly for fun. I doubt
I'll ever get to the point where I can actually use it on a real
Z80 system, but who knows. Mostly this is a good way to learn
about vasm and refresh my Z80 assembly knowledge.
This commit is contained in:
A.M. Rowsell 2025-12-20 17:58:51 -05:00
commit 94d6f474cd
Signed by: amr
GPG key ID: E0879EDBDB0CA7B1
7 changed files with 412 additions and 8 deletions
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346
LICENSE Normal file
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@ -0,0 +1,346 @@
Mozilla Public License Version 2.0
==================================
1. Definitions
--------------
1.1. "Contributor"
means each individual or legal entity that creates, contributes to
the creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used
by a Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached
the notice in Exhibit A, the Executable Form of such Source Code
Form, and Modifications of such Source Code Form, in each case
including portions thereof.
1.5. "Incompatible With Secondary Licenses"
means
(a) that the initial Contributor has attached the notice described
in Exhibit B to the Covered Software; or
(b) that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the
terms of a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in
a separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible,
whether at the time of the initial grant or subsequently, any and
all of the rights conveyed by this License.
1.10. "Modifications"
means any of the following:
(a) any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered
Software; or
(b) any new file in Source Code Form that contains any Covered
Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the
License, by the making, using, selling, offering for sale, having
made, import, or transfer of either its Contributions or its
Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU
Lesser General Public License, Version 2.1, the GNU Affero General
Public License, Version 3.0, or any later versions of those
licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that
controls, is controlled by, or is under common control with You. For
purposes of this definition, "control" means (a) the power, direct
or indirect, to cause the direction or management of such entity,
whether by contract or otherwise, or (b) ownership of more than
fifty percent (50%) of the outstanding shares or beneficial
ownership of such entity.
2. License Grants and Conditions
--------------------------------
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
(a) under intellectual property rights (other than patent or
trademark) Licensable by such Contributor to use, reproduce,
make available, modify, display, perform, distribute, and
otherwise exploit its Contributions, either on an unmodified
basis, with Modifications, or as part of a Larger Work; and
(b) under Patent Claims of such Contributor to make, use, sell,
offer for sale, have made, import, and otherwise transfer either
its Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor
first distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted
under this License. No additional rights or licenses will be implied
from the distribution or licensing of Covered Software under this
License. Notwithstanding Section 2.1(b) above, no patent license is
granted by a Contributor:
(a) for any code that a Contributor has removed from Covered
Software; or
(b) for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of
its Contributions with other software (except as part of its
Contributor Version); or
(c) under Patent Claims infringed by Covered Software in the absence
of its Contributions.
This License does not grant any rights in the trademarks, service
marks, or logos of any Contributor (except as may be necessary to
comply with the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License
(if permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient
rights to grant the rights to its Contributions conveyed by this
License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses
granted in Section 2.1.
3. Responsibilities
-------------------
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including
any Modifications that You create or to which You contribute, must
be under the terms of this License. You must inform recipients that
the Source Code Form of the Covered Software is governed by the
terms of this License, and how they can obtain a copy of this
License. You may not attempt to alter or restrict the recipients'
rights in the Source Code Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
(a) such Covered Software must also be made available in Source Code
Form, as described in Section 3.1, and You must inform recipients
of the Executable Form how they can obtain a copy of such Source
Code Form by reasonable means in a timely manner, at a charge no
more than the cost of distribution to the recipient; and
(b) You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that
the license for the Executable Form does not attempt to limit or
alter the recipients' rights in the Source Code Form under this
License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your
choice, provided that You also comply with the requirements of this
License for the Covered Software. If the Larger Work is a
combination of Covered Software with a work governed by one or more
Secondary Licenses, and the Covered Software is not Incompatible
With Secondary Licenses, this License permits You to additionally
distribute such Covered Software under the terms of such Secondary
License(s), so that the recipient of the Larger Work may, at their
option, further distribute the Covered Software under the terms of
either this License or such Secondary License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of
warranty, or limitations of liability) contained within the Source
Code Form of the Covered Software, except that You may alter any
license notices to the extent required to remedy known factual
inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of
Covered Software. However, You may do so only on Your own behalf,
and not on behalf of any Contributor. You must make it absolutely
clear that any such warranty, support, indemnity, or liability
obligation is offered by You alone, and You hereby agree to
indemnify every Contributor for any liability incurred by such
Contributor as a result of warranty, support, indemnity, or
liability terms You offer.
4. Inability to Comply Due to Statute or Regulation
---------------------------------------------------
If it is impossible for You to comply with any of the terms of this
License with respect to some or all of the Covered Software due to
statute, judicial order, or regulation then You must: (a) comply
with the terms of this License to the maximum extent possible; and
(b) describe the limitations and the code they affect. Such
description must be placed in a text file included with all
distributions of the Covered Software under this License. Except to
the extent prohibited by statute or regulation, such description
must be sufficiently detailed for a recipient of ordinary skill to
be able to understand it.
5. Termination
--------------
5.1. The rights granted under this License will terminate automatically
if You fail to comply with any of its terms. However, if You become
compliant, then the rights granted under this License from a
particular Contributor are reinstated (a) provisionally, unless and
until such Contributor explicitly and finally terminates Your
grants, and (b) on an ongoing basis, if such Contributor fails to
notify You of the non-compliance by some reasonable means prior to
60 days after You have come back into compliance. Moreover, Your
grants from a particular Contributor are reinstated on an ongoing
basis if such Contributor notifies You of the non-compliance by some
reasonable means, this is the first time You have received notice of
non-compliance with this License from such Contributor, and You
become compliant prior to 30 days after Your receipt of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor
Version directly or indirectly infringes any patent, then the rights
granted to You by any and all Contributors for the Covered Software
under Section 2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all
end user license agreements (excluding distributors and resellers)
which have been validly granted by You or Your distributors under
this License prior to termination shall survive termination.
6. Disclaimer of Warranty
-------------------------
Covered Software is provided under this License on an "as is"
basis, without warranty of any kind, either expressed, implied, or
statutory, including, without limitation, warranties that the
Covered Software is free of defects, merchantable, fit for a
particular purpose or non-infringing. The entire risk as to the
quality and performance of the Covered Software is with You. Should
any Covered Software prove defective in any respect, You (not any
Contributor) assume the cost of any necessary servicing, repair, or
correction. This disclaimer of warranty constitutes an essential
part of this License. No use of any Covered Software is authorized
under this License except under this disclaimer.
7. Limitation of Liability
--------------------------
Under no circumstances and under no legal theory, whether tort
(including negligence), contract, or otherwise, shall any
Contributor, or anyone who distributes Covered Software as permitted
above, be liable to You for any direct, indirect, special,
incidental, or consequential damages of any character including,
without limitation, damages for lost profits, loss of goodwill, work
stoppage, computer failure or malfunction, or any and all other
commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of
liability shall not apply to liability for death or personal injury
resulting from such party's negligence to the extent applicable
law prohibits such limitation. Some jurisdictions do not allow the
exclusion or limitation of incidental or consequential damages, so
this exclusion and limitation may not apply to You.
8. Litigation
-------------
Any litigation relating to this License may be brought only in the
courts of a jurisdiction where the defendant maintains its principal
place of business and such litigation shall be governed by laws of
that jurisdiction, without reference to its conflict-of-law
provisions. Nothing in this Section shall prevent a party's ability
to bring cross-claims or counter-claims.
9. Miscellaneous
----------------
This License represents the complete agreement concerning the
subject matter hereof. If any provision of this License is held to
be unenforceable, such provision shall be reformed only to the
extent necessary to make it enforceable.
Any law or regulation which provides that the language of a contract
shall be construed against the drafter shall not be used to construe
this License against a Contributor.
10. Versions of the License
---------------------------
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in
Section 10.3, no one other than the license steward has the right
to modify or publish new versions of this License. Each version
will be given a distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the
version of the License under which You originally received the
Covered Software, or under the terms of any subsequent version
published by the license steward.
10.3. Modified Versions
If you create software governed by this License, you may create a
new license version by modifying this License and renaming it. You
may distribute your modified version of the License with your
software. The modified license may not be called the Mozilla Public
License.
10.4. Distributing Source Code Form That Is Incompatible With Secondary
Licenses
If You choose to distribute Source Code Form that is Incompatible
With Secondary Licenses under the terms of this version of the
License, the notice described in Exhibit B of this License must be
attached.
Exhibit A - Source Code Form License Notice
-------------------------------------------
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at https://mozilla.org/MPL/2.0/.
Exhibit B - "Incompatible With Secondary Licenses" Notice
---------------------------------------------------------
This Source Code Form is "Incompatible With Secondary Licenses", as
defined by the Mozilla Public License, v. 2.0.

13
Makefile
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@ -1,3 +1,4 @@
# SPDX-License-Identifier: MPL-2.0
ASM=vasm_z80_std
LINK=vlink
@ -12,10 +13,16 @@ float.o: float.asm
printChar.o: printChar.asm
$(ASM) $(ASMFLAGS) -o $@ $<
float.hex: float.o printChar.o linker.cmd
$(LINK) $(LINKFLAGS) -o $@ float.o printChar.o
vectorTable.o: vectorTable.asm
$(ASM) $(ASMFLAGS) -o $@ $<
zone.o: zone.asm
$(ASM) $(ASMFLAGS) -o $@ $<
float.hex: float.o printChar.o vectorTable.o zone.o linker.cmd
$(LINK) $(LINKFLAGS) -o $@ float.o printChar.o vectorTable.o zone.o
clean:
rm -f float.o printChar.o float.hex
rm -f float.o printChar.o vectorTable.o zone.o float.hex
.PHONY: all clean

6
float.asm
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@ -1,3 +1,5 @@
; SPDX-License-Identifier: MPL-2.0
; SPDX-FileCopyrightText: (c) 2025 A.M. Rowsell
; ============================================================
; Z80 Soft Float Library (4-byte) + Print + Parse (vasm syntax)
; ============================================================
@ -38,7 +40,7 @@
; ============================================================
; CODE
; ============================================================
.text
.section float
; ------------------------------------------------------------
; External routine you provide:
; printChar: prints ASCII character in A
@ -1613,7 +1615,7 @@ DIGLEN: .space 1
; 100000.0 = 143 43 50 00
; 1000000.0= 146 74 24 00
; ============================================================
.text
.section float
pow10_table:
.byte 127, 0x00, 0x00, 0x00 ; 10^0 = 1
.byte 130, 0x20, 0x00, 0x00 ; 10^1 = 10

10
linker.cmd
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@ -1,6 +1,10 @@
# SPDX-License-Identifier: MPL-2.0
SECTIONS
{
.text 0xE000 : { *(.text) }
.data 0x7000 : { *(.data) }
.bss : { *(.bss) }
.zone 0xA000 : { *(.zone) *(zone) }
.text 0xE000 : { *(.text) }
.float 0xE000 : { *(.float) *(float) }
.vectors 0xF000 : { *(.vectors) }
.data 0x7000 : { *(.data) }
.bss : { *(.bss) }
}

2
printChar.asm
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@ -1,3 +1,5 @@
; SPDX-License-Identifier: MPL-2.0
; SPDX-FileCopyrightText: (c) 2025 A.M. Rowsell
; Stub printChar: does nothing
.global printChar
printChar:

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vectorTable.asm Normal file
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; SPDX-License-Identifier: MPL-2.0
; SPDX-FileCopyrightText: (c) 2025 A.M. Rowsell
; ============================================================
; OS Vector Table (128 x 2-byte addresses) at 0xF000-0xF1FF
; ============================================================
.equ OS_VEC_BASE,0xF000
; .vectors is pinned to 0xF000 via linker.cmd
.section .vectors
.global os_vectors
os_vectors:
.word os_print_vec
.word os_getch_vec
.word os_outbyte_vec
.word os_inbyte_vec
.zero 248

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zone.asm Normal file
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; SPDX-License-Identifier: MPL-2.0
; SPDX-FileCopyrightText: (c) 2025 A.M. Rowsell
; ============================================================
; ZONE OS main section
; ============================================================
.section zone
.global zone_start
.global os_print_vec
.global os_getch_vec
.global os_outbyte_vec
.global os_inbyte_vec
zone_start:
ret
os_print_vec:
ret
os_getch_vec:
ret
os_outbyte_vec:
ret
os_inbyte_vec:
ret