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feat(contrib): Windows kernel-mode library for drivers (zxc_km.lib) - #513

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jeanga:feat/windows-kernel

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@jeanga

@jeanga jeanga commented Oct 13, 2026 •

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Summary

Lets a Windows kernel-mode driver link ZXC's buffer API as a static library, zxc_km.lib, built from the unmodified core sources, with a self-test driver as the reference consumer and a build-only CI job. The Windows counterpart of contrib/linux-kernel.

contrib/windows-kernel/:

  • zxc_deps.h — the kernel replacement for src/lib/zxc_deps.h: executive pool behind ZXC_MALLOC/ZXC_CALLOC/ZXC_FREE, align-by-hand for the cache-line workspaces, a SWAR popcount, static_assert as the keyword. No header shims are needed on Windows.
  • zxc_km_target.props, zxc_km.props — the settings both projects share: the include order, /std:c17 /Zc:preprocessor-, /kernel, the zxc defines, /W4 /WX, /Z7, /Zl, /O2, no /GL, /arch:IA32 on Win32.
  • zxc_km.vcxproj — a static library on the WindowsKernelModeDriver10.0 toolset; a staging target copies the seven core units, the internal headers, the vendored hash and the public headers next to the kernel dependency header, as the Linux Makefile does.
  • zxc_selftest.vcxproj, selftest.c — a WDM driver whose DriverEntry round-trips a block, a frame and an in-place frame at a fast and a dense level and refuses to load on a mismatch, like the Linux module.
  • check-image.ps1 — CI's modinfo: the image imports ntoskrnl.exe only, is Native, of the right machine and subsystem version, and (x86) uses no XMM register.
  • README.md — the consumer contract and the platform rules.

Plus .github/workflows/windows-kernel.yml, pointers in docs/INSTALL.md and docs/API.md, and the design spec and plan under docs/superpowers/.

Nothing under src/lib or include changes.

Targets

  • Default: Windows 10 2004 (ExAllocatePool2), x64 and ARM64, built with the current kit. Baseline SSE2 and NEON are legal in kernel mode and stay on (ZXC_ONLY_DEFAULT, not ZXC_DISABLE_SIMD); AVX never appears.
  • Plan B: /p:TargetVersion=Windows7, x64 and Win32, built with the 22000 kit, the newest whose project system accepts either. Below 2004 the header allocates through the kit's ExAllocatePoolUninitialized wrapper with POOL_NX_OPTIN, and the consumer's DriverEntry calls ExInitializeDriverRuntime(DrvRtPoolNxOptIn). x86 is scalar.

What the toolset does not tell you (all verified by building)

  • With the toolset's own include order, <stdint.h> cannot be included at all: the kit's legacy km\crt headers and the compiler's vcruntime.h redefine each other's macros. The sheet ignores the standard path and names compiler headers, UCRT, km, shared.
  • The CL rule drops the C-standard property, so /std:c17 goes through AdditionalOptions; wdm.h's ARM64 macros need /Zc:preprocessor-.
  • /kernel reaches driver configurations only, not static libraries; the sheet passes it, and the header refuses to build without it.
  • sdkddkver.h cannot be included ahead of ntddk.h; the header requires NTDDI_VERSION and cross-checks its thresholds against the kit.
  • The toolset turns /GL on for ARM64; off, so the archive is not tied to one compiler build.
  • /kernel alone leaves the 32-bit compiler on SSE2 code generation, and x86 kernel mode does not preserve XMM state for drivers: /arch:IA32. The kit's warning.h raises C4242 by pragma past any /wd, so the header disables it on x86.
  • Kits newer than 22000 refuse a Windows 7 target and the Win32 platform in their MSBuild targets while their compilers still build the code.

Verification

Every build with warnings as errors, zero warnings:

Kit Toolset Target Platforms
26100 EWDK MSVC 14.44 Windows 10 2004 x64, ARM64
22000 EWDK MSVC 14.28 Windows 7 x64, Win32

check-image.ps1 passes on all four images and fails on a deliberately wrong expectation. The plan B libraries reference ExDefaultNonPagedPoolType and ExAllocatePoolWithTag; the default library references ExAllocatePool2 only. Plan B on ARM64, and plan B on a machine without the 22000 kit, stop with readable toolset errors and no binary.

Not done: loading the driver. That is a manual step on a test-signed VM under Driver Verifier, documented in the README, as for the Linux module.

CI

library (pull-request path): x64 and ARM64 at the default target with the runner's 26100 kit, then the image check. plan-b (schedule and dispatch only): installs the 22000 kit with winget, builds x64 and Win32 at Windows 7. The plan B job has not run yet; its three possible outcomes and the next move for each are in the plan.

Summary by CodeRabbit

  • New Features
    • Added Windows kernel-mode support for x64 and ARM64, targeting Windows 10 version 2004 or later.
    • Added a kernel-mode self-test for block and frame compression and decompression.
  • Documentation
    • Added guidance for building, integrating, and testing the Windows kernel library, including platform requirements and constraints.
    • Updated porting and vendoring guides to include Windows drivers.

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📝 Walkthrough

Adds a Windows kernel-mode ZXC static library and self-test driver for x64 and ARM64. Adds MSBuild projects, a Windows build workflow, image validation, and documentation for building and using the library.

Changes: Windows Kernel Library

Layer / File(s) Summary
Kernel dependencies and library build
contrib/windows-kernel/zxc_deps.h, contrib/windows-kernel/zxc_km_target.props, contrib/windows-kernel/zxc_km.props, contrib/windows-kernel/zxc_km.vcxproj, contrib/windows-kernel/.gitignore
Adds kernel build checks and allocation, aligned allocation, and popcount helpers. Adds MSBuild settings and a staged static-library project for x64 and ARM64.
Self-test driver and project
contrib/windows-kernel/selftest.c, contrib/windows-kernel/zxc_selftest.vcxproj
Adds a driver that tests block and frame compression and decompression at levels 3 and 7. Adds a project that builds the driver for x64 and ARM64 and references the library.
Windows build workflow and image checks
.github/workflows/kernel-windows.yml, contrib/windows-kernel/check-image.ps1, .github/workflows/README.md
Adds SDK and WDK installation and toolchain discovery, builds the library and driver, and checks the driver image. The image check validates imports, machine type, subsystem, and disassembly.
Windows kernel consumer guidance
contrib/windows-kernel/README.md, docs/API.md, docs/INSTALL.md
Adds Windows kernel build and usage guidance. Updates the porting and vendoring guidance to link to the Windows driver guide.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Workflow as kernel-windows.yml
  participant Runner as windows-2025 runner
  participant Installer as SDK and WDK installers
  participant MSBuild
  participant CheckImage as check-image.ps1
  participant Dumpbin as dumpbin
  Workflow->>Runner: Start x64 or ARM64 job
  Runner->>Installer: Install kits if kernel headers are absent
  Runner->>MSBuild: Build library and self-test driver
  MSBuild-->>Runner: Produce driver image
  Runner->>CheckImage: Check the driver image
  CheckImage->>Dumpbin: Read imports, PE properties, and disassembly
  Dumpbin-->>CheckImage: Return image details
Loading
Merge Risk: 🔵 Low · up to 6df57

The image check can miss some VEX/EVEX instructions, such as KADDB, despite the documented no-AVX guarantee. This is a narrow validation gap; merging with owner awareness is reasonable.

Pre-merge checks: Passed 4 · Failed 1

Failed Failed checks: 1 warning

Check name Status Explanation Resolution
Docstring Coverage Warning Docstring coverage is 36.36% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 2 files. (2 skipped: … Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed Passed checks: 4 passed
Check name Status Explanation
Description Check Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check Passed The title clearly identifies the main change: adding a Windows kernel-mode library for drivers.
Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage

Explanation

Docstring coverage is 36.36% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 2 files. (2 skipped: 2 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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jeanga added 14 commits October 13, 2026 21:22
Records the design of contrib/windows-kernel: a kernel-mode static library
built from the unmodified core on the WDK toolset, a self-test driver as its
reference consumer, a build-only CI job, and the platform rules a consumer
must follow. Grounded in a compile-and-link spike on x64 and ARM64 with the
22621 and 26100 kits.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
The library targets Windows 7 on x64 by default, so one binary runs on every
supported Windows; ARM64 starts at Windows 10. Below Windows 10 2004 the
dependency header allocates through the kit's ExAllocatePoolUninitialized
wrapper with POOL_NX_OPTIN, and the consumer's DriverEntry opts into NX pool
at run time. Verified by building the target on the 22621 and 20348 kits.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
The default build uses ExAllocatePool2 and asks nothing of the consumer's
DriverEntry. Windows 7 stays the floor as a documented alternative build,
selected with TargetVersion=Windows7 on x64 and built by CI on every run.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
Verified by building: the x86 kernel-mode library and self-test compile and
link for Windows 7 and Windows 10 targets, scalar under /arch:IA32, which
/kernel alone does not imply. Kits newer than 22000 refuse the Win32
platform and any non-latest TargetVersion in their MSBuild targets while
their compilers still build the code, so plan B (Windows 7 and x86) is built
with the 22000 kit in a scheduled CI job; the pull-request job keeps x64 and
ARM64 on the runner's 26100 kit.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
Five tasks: the dependency header, property sheets and library project; the
self-test driver and the image check script; plan B on the 22000 kit with
its two expected failures; the README and doc pointers; the CI workflow.
Every file is written out in full, with the build and check commands for
the EWDKs on this machine.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
….lib)

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
Signed-off-by: Jean Gautier <jeanga@hotmail.com>
Signed-off-by: Jean Gautier <jeanga@hotmail.com>
…ule, plan B

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
- zxc_km.props carries the rules only: output directories and the staged
  include path move into the two projects, so a vendoring consumer can
  import the sheet without having its outputs redirected into this tree.
- The self-test project forwards TargetVersion through its project
  reference, and the README says why: a project property does not cross a
  ProjectReference, so a plan B driver would otherwise link a library built
  for Windows 10 2004 and fail to load on Windows 7.
- The self-test reports an allocation failure as STATUS_INSUFFICIENT_RESOURCES
  rather than STATUS_DATA_ERROR, including the library's own ZXC_ERROR_MEMORY.
- Spec touched up where the implementation rightly diverged: two sheets,
  no sdkddkver.h, check-image.ps1 in the tree.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
The windows-2025 image carries the WDK's Visual Studio extension but not the
kit itself, so the first run stopped at the toolchain check. Both jobs now
install their kit with Microsoft's installers (26100.6584 for the library
job, SDK and WDK 22000.1 for plan B) and take MSBuild from the Visual Studio
instance that has the WDK extension rather than the newest instance.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
…al build

The image carries Visual Studio 2022 and 2026, and vswhere picked 2026,
whose MSBuild asks the 26100 kit for task assemblies it only ships for
Visual Studio 2022 (MSB4062). The library job now pins the Visual Studio
2022 instance that has the WDK extension.

The plan B job is dropped: the 22000 kit ships its MSBuild task assemblies
for Visual Studio 2019 only, selected by $(VisualStudioVersion), so its
targets cannot load on this image. Plan B is verified locally against the
22000 EWDK, the fallback the spec names, and the README says so.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
…he toolchain is missing

The Visual Studio 2022 instance with the WDK extension was not found on the
runner, contrary to the image's published inventory. When the locate step
fails it now lists every instance, which ones carry the WDK extension, and
the kit's MSBuild task assemblies, so the next fix rests on facts.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
The runner image carries Visual Studio 2026 only, with the WDK extension,
and a kit's MSBuild task assemblies exist for one Visual Studio version:
the 26100 kit's for 2022, the 28000 kit's for 2026. The job now installs
the 28000 SDK and WDK with Microsoft's installers, pins the Visual Studio
2026 instance and builds with WindowsTargetPlatformVersion 10.0.28000.0.
Verified against the 28000 EWDK (MSVC 14.50): x64 and ARM64 build with
zero warnings and pass the image check.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
@jeanga
jeanga force-pushed the feat/windows-kernel branch from b09da1e to 63da49b Compare October 13, 2026 19:22
@hellobertrand

hellobertrand commented Oct 13, 2026 •

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awesome!

@hellobertrand

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@jeanga you are the original author of this new tree, so you can replace the actual copyright line (Copyright (c) Bertrand Lebonnois and contributors.) in each file by Copyright (c) Jean Gautier and contributors.

The maintainer asked that the new tree carry its original author's name in place of the line copied from the rest of the repository. The plan's embedded copies of the file headers follow.

Signed-off-by: Jean Gautier <jeanga@hotmail.com>
@jeanga

jeanga commented Oct 14, 2026

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Done in 3ecd69c: the copyright line now reads Copyright (c) Jean Gautier and contributors. in each file of the tree. Thanks!

@jeanga
jeanga marked this pull request as ready for review October 14, 2026 10:32
@jeanga
jeanga requested a review from hellobertrand as a code owner October 14, 2026 10:32

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Actionable comments posted: 3

🔇 Additional comments: 3
docs/API.md: 1

78-78: LGTM!

docs/INSTALL.md: 1

6-6: LGTM!

contrib/windows-kernel/README.md-171-171: 1

171-171: 📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

⚠️ Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.

Make the pool tag’s trailing space explicit.

The trailing space inside the zxc code span triggers markdownlint MD038 and makes the tag’s final character hard to see. Use zxc followed by prose that says “with a trailing space.”

Source: Linters/SAST tools


  • 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @contrib/windows-kernel/check-image.ps1:
- Line 44: Check $LASTEXITCODE immediately after the dumpbin invocation that
assigns $xmm, and treat a nonzero exit code as a failed image check so a failed
disassembly cannot proceed to report success.

Review comments at @contrib/windows-kernel/README.md:
- Line 51: Update the CI kit version in the README’s introductory statement from
26100 to 28000, matching the version specified in the later CI setup section.

Review comments at
@docs/superpowers/specs/2026-10-13-windows-kernel-contrib-design.md:
- Around line 17-19: Update the Windows 7 plan B claims in the design overview
and its decisions section to say the target is verified locally, not built by CI
on every run. Make clear that x64 or ARM64 CI passes do not validate the Windows
7 build.

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  • .github/workflows/README.md
  • .github/workflows/windows-kernel.yml
  • contrib/windows-kernel/.gitignore
  • contrib/windows-kernel/README.md
  • contrib/windows-kernel/check-image.ps1
  • contrib/windows-kernel/selftest.c
  • contrib/windows-kernel/zxc_deps.h
  • contrib/windows-kernel/zxc_km.props
  • contrib/windows-kernel/zxc_km.vcxproj
  • contrib/windows-kernel/zxc_km_target.props
  • contrib/windows-kernel/zxc_selftest.vcxproj
  • docs/API.md
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Comment thread contrib/windows-kernel/check-image.ps1 Outdated
Comment thread contrib/windows-kernel/README.md Outdated
Comment thread docs/superpowers/specs/2026-10-13-windows-kernel-contrib-design.md Outdated
Comment thread .github/workflows/windows-kernel.yml
Comment thread .github/workflows/windows-kernel.yml
Comment thread .github/workflows/windows-kernel.yml
Comment thread contrib/windows-kernel/check-image.ps1 Outdated
Comment thread .github/workflows/windows-kernel.yml Outdated
Comment thread contrib/windows-kernel/selftest.c Outdated
Comment thread contrib/windows-kernel/zxc_selftest.vcxproj Outdated
Comment thread docs/superpowers/plans/2026-10-13-windows-kernel-contrib.md Outdated
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Comment thread contrib/windows-kernel/README.md Outdated
@hellobertrand hellobertrand added enhancement New feature or request packaging labels Oct 16, 2026
- Drop plan B (Windows 7, Win32): Windows 10 2004 on x64 and ARM64 is the
  only target; zxc_deps.h refuses an older NTDDI_VERSION or another machine.
- Rename the workflow to kernel-windows.yml.
- Pin the SDK and WDK installers to versioned URLs and check their SHA-256
  and Microsoft Authenticode signature before running them.
- check-image.ps1: fail on a nonzero dumpbin exit code, and reject ymm/zmm
  registers (AVX) on every image.
- README: CI uses the 28000 kit; plan B sections removed.
- Replace the hand-made project GUIDs with generated ones.
- selftest.c: static_assert spelling.
- Remove the design spec and plan under docs/superpowers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Actionable comments posted: 2

🧹 Nitpick comments: 1
contrib/windows-kernel/zxc_deps.h: 1

97-109: 🎯 Functional Correctness | 🔵 Trivial | 💤 Low value

Validate alignment as a power of two.

The mask arithmetic on Line 106 is only correct when alignment is a power of two. alignment + sizeof(void*) on Line 103 can also wrap before RtlSizeTAdd sees it. Current core callers pass ZXC_CACHE_LINE_SIZE, so the issue cannot be triggered today. A guard costs little and matches aligned_alloc semantics.

🛡️ Proposed guard
     if (alignment < sizeof(void*)) alignment = sizeof(void*);
+    if ((alignment & (alignment - 1)) != 0 || alignment > ((size_t)-1) - sizeof(void*)) return NULL;
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Review comment at @contrib/windows-kernel/zxc_deps.h around lines 97 - 109:
Update zxc_km_aligned_alloc to reject alignments that are not powers of two and
prevent overflow when adding sizeof(void*) to alignment, before the mask
arithmetic and size calculation. Preserve the existing minimum-alignment
adjustment and allocation behavior for valid inputs.

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Inline comments:
Review comments at @contrib/windows-kernel/check-image.ps1:
- Around line 56-57: Update the AVX detection used to compute $avx from
Invoke-Dumpbin so it catches AVX instructions such as vzeroupper even when they
have no ymm or zmm operands. Preserve detection of instructions that do use
those registers, and ensure any detected AVX instruction contributes to the
failure count.

Review comments at @contrib/windows-kernel/README.md:
- Line 200: Update the self-test setup instructions around `bcdedit /set
testsigning on` to require suspending BitLocker first if enabled, then disabling
Secure Boot before enabling test signing and rebooting.

---

Nitpick comments:
Review comments at @contrib/windows-kernel/zxc_deps.h:
- Around line 97-109: Update zxc_km_aligned_alloc to reject alignments that are
not powers of two and prevent overflow when adding sizeof(void*) to alignment,
before the mask arithmetic and size calculation. Preserve the existing
minimum-alignment adjustment and allocation behavior for valid inputs.

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Thanks for the updates! 2 small changes left (AVX check, secure boot note) and it's good to merge.

Comment thread contrib/windows-kernel/README.md
Comment thread contrib/windows-kernel/check-image.ps1 Outdated
check-image.ps1 matched register names only, so vzeroupper and VEX
instructions on xmm registers passed. On x64 it now also rejects any v
mnemonic. The README notes that test signing needs Secure Boot off.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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hellobertrand commented Oct 16, 2026 •

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Please you have to signoff all yours commits to pass DCO checks.

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Actionable comments posted: 1


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Inline comments:
Review comments at @contrib/windows-kernel/README.md:
- Around line 192-194: Update the CI description in the README near the
`check-image.ps1` discussion to state that the checker rejects `ymm`/`zmm`
registers and, on x64, mnemonics starting with `v`, but may miss other VEX/EVEX
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Comment thread contrib/windows-kernel/README.md
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@jeanga LGTM ✅ Once it's rebased onto main with signed-off commits (DCO), it's good to merge.

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