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Utilize GitHub Actions for building and running via QEMU
This commit introduces initial support for compiling the RISC-V target using the LLVM toolchain. Add CI workflow to build and test with QEMU Introduce GitHub Actions-based CI that builds the kernel using the GNU RISC-V toolchain and runs selected apps (e.g., cpubench) in QEMU. Results are extracted and posted to PRs. Toolchain setup, build, and QEMU test logic are modularized into scripts in .ci/. Features: - Support multiple apps per run - CI comments results on PR automatically - Timeout prevents hangs Limitations: - Currently GNU-only (LLVM WIP) - cpubench doesn't exit cleanly due to preemptive mode Fixes: #2 Supersedes: #11 Refactor riscv build.mk toolchain selection logic Add CI workflow for building and testing Improve CI workflow with QEMU, cpubench, timeout I notice that the cpu bench will make qemu into Scheduler mode: Preemptive so the qemu will not stop, add some trick to pass the test(not good) Refactor CI workflow for improved toolchain usage Comment out hello build and run step in CI workflow Update RISC-V toolchain and enable hello build step Add -bios none to QEMU commands in CI workflow Remove hello build and run step from CI workflow Add timeout to QEMU command in CI workflow Add completion message to cpubench CI step Allow QEMU step to pass without stopping CI job ci: refactor QEMU test workflow and extract scripts The workflow now extracts cpubench results from QEMU output and automatically comments the result on pull requests. Improve CI workflow with QEMU, cpubench, timeout I notice that the cpu bench will make qemu into Scheduler mode: Preemptive so the qemu will not stop, add some trick to pass the test(not good) Refactor CI workflow for improved toolchain usage Comment out hello build and run step in CI workflow Update RISC-V toolchain and enable hello build step Add -bios none to QEMU commands in CI workflow Remove hello build and run step from CI workflow Add timeout to QEMU command in CI workflow Add completion message to cpubench CI step Allow QEMU step to pass without stopping CI job Fix merge conflict markers in CI workflow file Use Ubuntu 24.04 in CI workflow Remove merge conflict markers from error.c Remove merge conflict markers from error.h Remove redundant libc.h include from libc.c Delete libc.c Add CI scripts and refactor workflow - Move toolchain setup, build, QEMU run, and result extraction to dedicated scripts in .ci/ - Update ci.yml to use these scripts for improved maintainability Make CI scripts executable Add flexible test sequencing and CI test suites - Replace run-qemu.sh with run-test-sequence.sh for configurable, robust test execution (supports timeouts, app lists, output dirs, continue-on-failure, and verbosity) - Add run-qemu-tests.sh for simple sequential app testing - Add test suite definitions: basic.txt, performance.txt, comprehensive.txt - Overhaul extract-result.sh to aggregate, summarize, and format results for GitHub Actions and artifacts - Update CI workflow to run multiple test suites (basic, performance, comprehensive, custom), upload artifacts, and generate a consolidated summary - Remove obsolete run-qemu.sh script Simplify CI test runner and result extraction Comment PR with benchmark results in CI workflow Run all basic apps in CI and comment results on PRs Remove extract-result.sh and update CI to inline test output Update QEMU tests to run cpubench and test64 only Inline build steps in CI workflow and remove build.sh Add LLVM toolchain support to CI and build system Remove test-summary job from CI workflow Update toolchain URLs and add CI test summary job Remove test64 argument from QEMU test script in CI Refactor toolchain URLs and add LLVM fallback in CI workflow Set CROSS_COMPILE to riscv32-unknown-elf- in CI setup Add AR=llvm-ar to LLVM toolchain environment setup Refactor toolchain URL to use TOOLCHAIN_OS variable Refactor RISC-V toolchain selection and defaults Run CI on all branches and pull requests Add __maybe_unused macro for unused attribute Use GNU ar instead of llvm-ar for LLVM toolchain Update toolchain version to verified Detect Clang toolchain in RISC-V build script
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‎.ci/run-qemu-tests.sh

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#!/bin/bash
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set -e
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# Check if at least one app is provided
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if [ $# -eq 0 ]; then
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echo "Usage: $0 <app1> [app2] [app3] ..."
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echo "Example: $0 hello echo cpubench"
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exit 1
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fi
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APPS="$@"
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TIMEOUT=10
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TOOLCHAIN_TYPE=${TOOLCHAIN_TYPE:-gnu}
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echo "[+] Will run apps: $APPS"
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echo "[+] Using toolchain: $TOOLCHAIN_TYPE"
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echo ""
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# Loop through each app
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for app in $APPS; do
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echo "=== Running $app ($TOOLCHAIN_TYPE) ==="
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# Build the app
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echo "[+] Building $app with $TOOLCHAIN_TYPE toolchain..."
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make clean >/dev/null 2>&1
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if ! make "$app" TOOLCHAIN_TYPE="$TOOLCHAIN_TYPE" >/dev/null 2>&1; then
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echo "[!] Failed to build $app with $TOOLCHAIN_TYPE"
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echo ""
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continue
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fi
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# Run in QEMU with timeout
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echo "[+] Running $app in QEMU (timeout: ${TIMEOUT}s)..."
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set +e
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timeout ${TIMEOUT}s qemu-system-riscv32 -nographic -machine virt -bios none -kernel build/image.elf
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exit_code=$?
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set -e
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# Print result
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if [ $exit_code -eq 124 ]; then
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echo "[!] $app timed out"
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elif [ $exit_code -eq 0 ]; then
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echo "[✓] $app completed successfully"
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else
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echo "[!] $app failed with exit code $exit_code"
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fi
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echo ""
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done
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echo "[+] All apps tested with $TOOLCHAIN_TYPE toolchain"

‎.ci/setup-toolchain.sh

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#!/bin/bash
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set -e
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# Default to GNU if no toolchain specified
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TOOLCHAIN_TYPE=${1:-gnu}
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TOOLCHAIN_REPO=https://github.com/riscv-collab/riscv-gnu-toolchain
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TOOLCHAIN_VERSION=2025.05.30
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TOOLCHAIN_OS=ubuntu-24.04
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setup_gnu_toolchain() {
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echo "[+] Setting up GNU RISC-V toolchain..."
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local URL="${TOOLCHAIN_REPO}/releases/download/${TOOLCHAIN_VERSION}/riscv32-elf-${TOOLCHAIN_OS}-gcc-nightly-${TOOLCHAIN_VERSION}-nightly.tar.xz"
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echo "[+] Downloading RISC-V GNU toolchain..."
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wget -q "$URL"
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tar -xf "$(basename "$URL")"
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echo "[+] Exporting GNU toolchain path..."
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echo "$PWD/riscv/bin" >> "$GITHUB_PATH"
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# Set cross-compile prefix for GNU
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echo "CROSS_COMPILE=riscv32-unknown-elf-" >> "$GITHUB_ENV"
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echo "TOOLCHAIN_TYPE=gnu" >> "$GITHUB_ENV"
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}
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setup_llvm_toolchain() {
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echo "[+] Setting up LLVM RISC-V toolchain..."
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# upstream URL for LLVM toolchainzz2
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local URL="${TOOLCHAIN_REPO}/releases/download/${TOOLCHAIN_VERSION}/riscv32-elf-${TOOLCHAIN_OS}-llvm-nightly-${TOOLCHAIN_VERSION}-nightly.tar.xz"
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echo "[+] Downloading RISC-V LLVM toolchain..."
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wget -q "$URL"
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tar -xf "$(basename "$URL")"
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echo "[+] Exporting LLVM toolchain path..."
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echo "$PWD/riscv/bin" >> "$GITHUB_PATH"
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# Set cross-compile prefix for LLVM
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echo "CROSS_COMPILE=riscv32-unknown-elf-" >> "$GITHUB_ENV"
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echo "TOOLCHAIN_TYPE=llvm" >> "$GITHUB_ENV"
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}
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case "$TOOLCHAIN_TYPE" in
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"gnu")
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setup_gnu_toolchain
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;;
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"llvm")
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setup_llvm_toolchain
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;;
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*)
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echo "Error: Unknown toolchain type '$TOOLCHAIN_TYPE'"
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echo "Usage: $0 [gnu|llvm]"
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exit 1
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;;
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esac
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echo "[+] Toolchain setup complete: $TOOLCHAIN_TYPE"

‎.github/workflows/ci.yml

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name: Linmo CI
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on:
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push:
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pull_request:
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jobs:
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matrix-tests:
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runs-on: ubuntu-24.04
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name: Test on ${{ matrix.toolchain }} toolchain
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strategy:
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fail-fast: false
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matrix:
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toolchain: [gnu, llvm]
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steps:
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- name: Checkout
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uses: actions/checkout@v4
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- name: Install base dependencies
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run: |
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sudo apt-get update
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sudo apt-get install -y build-essential qemu-system-riscv32 wget
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- name: Setup ${{ matrix.toolchain }} toolchain
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run: .ci/setup-toolchain.sh ${{ matrix.toolchain }}
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- name: Verify toolchain installation
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run: |
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if [ "${{ matrix.toolchain }}" = "gnu" ]; then
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riscv32-unknown-elf-gcc --version
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else
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# LLVM toolchain fallback: try system llvm-objdump
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riscv32-unknown-elf-clang --version || clang --version
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riscv32-unknown-elf-llvm-objdump --version || llvm-objdump --version
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fi
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qemu-system-riscv32 --version
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- name: Build Kernel
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run: |
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make clean
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make
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env:
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TOOLCHAIN_TYPE: ${{ matrix.toolchain }}
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- name: Run Basic Apps
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id: test
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run: |
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output=$(.ci/run-qemu-tests.sh cpubench )
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echo "TEST_OUTPUT<<EOF" >> $GITHUB_OUTPUT
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echo "$output" >> $GITHUB_OUTPUT
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echo "EOF" >> $GITHUB_OUTPUT
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env:
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TOOLCHAIN_TYPE: ${{ matrix.toolchain }}
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- name: Comment PR with results
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if: github.event_name == 'pull_request'
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uses: actions/github-script@v7
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with:
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script: |
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const output = `${{ steps.test.outputs.TEST_OUTPUT }}`;
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const toolchain = `${{ matrix.toolchain }}`.toUpperCase();
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github.rest.issues.createComment({
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issue_number: context.issue.number,
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owner: context.repo.owner,
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repo: context.repo.repo,
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body: `## Linmo QEMU App Test Result (${toolchain} Toolchain)\n\n\`\`\`\n${output}\n\`\`\`\n\n_This is an automated report from CI._`
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});
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# Optional: Create a summary job that depends on all matrix jobs
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test-summary:
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runs-on: ubuntu-24.04
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needs: matrix-tests
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if: always()
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steps:
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- name: Check test results
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run: |
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if [ "${{ needs.matrix-tests.result }}" = "success" ]; then
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echo "✅ All toolchain tests passed!"
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else
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echo "❌ Some toolchain tests failed"
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exit 1
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fi

‎arch/riscv/build.mk

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-DF_TIMER=$(F_TICK) \
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-include config.h
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20-
ASFLAGS = -march=rv32imzicsr -mabi=ilp32
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CROSS_COMPILE ?= riscv32-unknown-elf-
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CC = $(CROSS_COMPILE)gcc
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CC_IS_CLANG := $(shell $(CC) --version 2>/dev/null | grep -qi clang && echo 1)
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# Architecture flags
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ARCH_FLAGS = -march=rv32imzicsr -mabi=ilp32
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# Common compiler flags
2128
CFLAGS += -Wall -Wextra -Wshadow -Wno-unused-parameter -Werror
2229
CFLAGS += -O2 -std=gnu99
23-
CFLAGS += -march=rv32imzicsr -mabi=ilp32
30+
CFLAGS += $(ARCH_FLAGS)
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CFLAGS += -mstrict-align -ffreestanding -nostdlib -fomit-frame-pointer
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CFLAGS += $(INC_DIRS) $(DEFINES) -fdata-sections -ffunction-sections
26-
ARFLAGS = r
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28-
# Linker flags
29-
LDFLAGS = -melf32lriscv --gc-sections
30-
LDSCRIPT = $(ARCH_DIR)/riscv32-qemu.ld
34+
ifeq ($(CC_IS_CLANG),1)
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ifeq ($(TOOLCHAIN_TYPE),llvm)
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CC = $(CROSS_COMPILE)clang
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AS = $(CROSS_COMPILE)clang
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LD = $(CROSS_COMPILE)ld.lld
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DUMP = $(CROSS_COMPILE)llvm-objdump -M no-aliases
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READ = $(CROSS_COMPILE)llvm-readelf
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OBJ = $(CROSS_COMPILE)llvm-objcopy
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SIZE = $(CROSS_COMPILE)llvm-size
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AR = $(CROSS_COMPILE)ar
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CFLAGS += --target=riscv32-unknown-elf
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CFLAGS += -Wno-unused-command-line-argument
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ASFLAGS = --target=riscv32-unknown-elf $(ARCH_FLAGS)
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LDFLAGS = -m elf32lriscv --gc-sections
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else
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CC = $(CC_DEFAULT)
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CC = $(CROSS_COMPILE)gcc
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AS = $(CROSS_COMPILE)as
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LD = $(CROSS_COMPILE)ld
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DUMP = $(CROSS_COMPILE)objdump -Mno-aliases
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READ = $(CROSS_COMPILE)readelf
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OBJ = $(CROSS_COMPILE)objcopy
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SIZE = $(CROSS_COMPILE)size
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AR = $(CROSS_COMPILE)ar
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32-
CROSS_COMPILE ?= riscv-none-elf-
33-
CC = $(CROSS_COMPILE)gcc
34-
AS = $(CROSS_COMPILE)as
35-
LD = $(CROSS_COMPILE)ld
36-
DUMP = $(CROSS_COMPILE)objdump -Mno-aliases
37-
READ = $(CROSS_COMPILE)readelf
38-
OBJ = $(CROSS_COMPILE)objcopy
39-
SIZE = $(CROSS_COMPILE)size
40-
AR = $(CROSS_COMPILE)ar
60+
ASFLAGS = $(ARCH_FLAGS)
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LDFLAGS = -melf32lriscv --gc-sections
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endif
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AR = $(CROSS_COMPILE)ar
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ARFLAGS = r
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LDSCRIPT = $(ARCH_DIR)/riscv32-qemu.ld
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HAL_OBJS := boot.o hal.o muldiv.o
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HAL_OBJS := $(addprefix $(BUILD_KERNEL_DIR)/,$(HAL_OBJS))

‎kernel/pipe.c

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#define PIPE_MIN_SIZE 4
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#define PIPE_MAX_SIZE 32768
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12+
#define __maybe_unused __attribute__((__unused__))
13+
1214
/* Enhanced validation with comprehensive integrity checks */
1315
static inline bool pipe_is_valid(const pipe_t *p)
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{
@@ -34,15 +36,15 @@ static inline uint16_t pipe_free_space_internal(const pipe_t *p)
3436
return (p->mask + 1) - p->used;
3537
}
3638

37-
static inline char pipe_get_byte(pipe_t *p)
39+
static inline __attribute__((__unused__)) char pipe_get_byte(pipe_t *p)
3840
{
3941
char val = p->buf[p->head];
4042
p->head = (p->head + 1) & p->mask;
4143
p->used--;
4244
return val;
4345
}
4446

45-
static inline void pipe_put_byte(pipe_t *p, char c)
47+
static inline __attribute__((__unused__)) void pipe_put_byte(pipe_t *p, char c)
4648
{
4749
p->buf[p->tail] = c;
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p->tail = (p->tail + 1) & p->mask;

‎lib/malloc.c

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109109
static void selective_coalesce(void)
110110
{
111111
memblock_t *p = first_free;
112-
uint32_t coalesced = 0;
113112

114113
while (p && p->next) {
115114
/* Merge only when blocks are FREE *and* adjacent in memory */
116115
uint8_t *pend = (uint8_t *) p + sizeof(memblock_t) + GET_SIZE(p);
117116
if (!IS_USED(p) && !IS_USED(p->next) && pend == (uint8_t *) p->next) {
118117
p->size = GET_SIZE(p) + sizeof(memblock_t) + GET_SIZE(p->next);
119118
p->next = p->next->next;
120-
coalesced++;
121119
free_blocks_count--;
122120
} else {
123121
p = p->next;

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