fix(ci): add safe.directory config for container submodule checkout

[MRNIU]

Summary

修复 CI 流水线两个问题：

1. Shallow submodule init exit code 128

使用 container: 运行 job 时，容器以 root 用户运行，但 actions/checkout 创建的工作目录归属于 runner 用户。git submodule update 在子目录中触发 git 的 safe.directory 检查，导致 exit code 128。

Fix: 在两个 build job 的 submodule init 步骤前添加 git config --global --add safe.directory '*'

2. riscv64 system test 无法检测到测试失败

riscv64 的 system test 步骤只检查 cmake 退出码（始终为 0），即使 QEMU 内的测试失败也会报告 passed。

Fix: 与 aarch64 对齐，捕获输出到文件并 grep "Failed: 0" 来判断通过/失败。

Failed runs

• https://github.com/Simple-XX/SimpleKernel/actions/runs/23351172436 (safe.directory)
• riscv64 balance_test FAIL 但 CI 报告 passed (test detection)

[Copilot]

Pull request overview

This PR addresses CI failures during shallow submodule initialization in containerized GitHub Actions jobs by adding a Git safe.directory configuration, and also includes substantial kernel/runtime updates (scheduler balancing, signals, tests) and removal of x86_64 support across build/docs.

Changes:

• Update GitHub Actions workflow to run riscv64/aarch64 builds in a container with shallow submodule init and safe.directory config.
• Add/expand kernel features and correctness fixes: cross-core wakeup, Wait/Exit locking changes, periodic load balancing, basic signal support, and improved memory allocator locking.
• Expand system/unit tests and remove x86_64-related build presets, tooling, and documentation.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tools/x86_64_qemu_virt.its.in	Remove x86_64 QEMU FIT template tooling.
tools/x86_64_boot_scr.txt	Remove x86_64 U-Boot boot script.
tools/README.md	Remove x86_64 tooling references.
tools/Dockerfile	Remove legacy tools Dockerfile.
tools/.pre-commit-config.yaml.in	Adjust commented clang-tidy exclude filters.
tests/unit_test/balance_test.cpp	Add unit tests for RR scheduler “steal” primitive.
tests/unit_test/README.md	Remove x86_64 unit test documentation entry.
tests/unit_test/CMakeLists.txt	Add balance_test.cpp to unit test build.
tests/system_test/yield_test.cpp	Add sys_yield system test.
tests/system_test/wait_system_test.cpp	Fix PID retrieval after move; rename wait entrypoint.
tests/system_test/tick_test.cpp	Add tick/sleep/runtime tracking system tests.
tests/system_test/thread_group_system_test.cpp	Use generated PIDs; rename entrypoint; run subtests sequentially.
tests/system_test/system_test.h	Rename test function declarations; add new test declarations; update QemuExit behavior.
tests/system_test/stress_test.cpp	Add basic stress system tests (many tasks/wait/rapid exit).
tests/system_test/spinlock_test.cpp	Improve barrier loop ordering; change timeout behavior.
tests/system_test/ramfs_system_test.cpp	Rename ramfs test entrypoint and logs/messages.
tests/system_test/main.cpp	Expand test registry; fix PID capture after AddTask; runner reaping logic; add atomic boot guard.
tests/system_test/fork_test.cpp	Add fork-related system tests.
tests/system_test/exit_system_test.cpp	Use local PID counter; rename exit entrypoint; adjust thread/zombie scenarios.
tests/system_test/ctor_dtor_test.cpp	Remove aarch64 FPU setup call from ctor/dtor test.
tests/system_test/clone_system_test.cpp	Capture child PIDs correctly; reap children to avoid runner accounting issues; rename entrypoint.
tests/system_test/balance_test.cpp	Add Balance() behavior system tests (migration + affinity).
tests/system_test/affinity_test.cpp	Add sched_get/setaffinity system tests.
tests/system_test/CMakeLists.txt	Rename system test sources; add many new system test sources; remove x86_64 QEMU flags.
tests/integration_test/aarch64_minimal/main.cpp	Update brief; remove custom FPU setup.
tests/integration_test/CMakeLists.txt	Remove x86_64-specific boot flags/subdirs.
tests/AGENTS.md	Update unit test command docs to build_{arch}.
src/task/wakeup.cpp	Refactor Wakeup to accept CpuSchedData; implement cross-core Wakeup/WakeupOne.
src/task/wait.cpp	Change lock ordering; add atomic block-with-locks to prevent lost wakeups; return ECHILD-like error.
src/task/tick_update.cpp	Call Balance() periodically (every 64 ticks).
src/task/task_manager.cpp	Implement Balance() work-stealing for kNormal tasks.
src/task/sleep.cpp	Check pending signals after sleep returns.
src/task/signal.cpp	Add basic signal mechanisms (pending/mask/actions) and delivery logic.
src/task/schedule.cpp	Introduce kernel_thread_bootstrap; set scheduler_started after taking lock.
src/task/mutex.cpp	Add fast path; prevent lost wakeups by blocking under scheduler lock; WakeupOne on unlock.
src/task/include/task_manager.hpp	Add signal APIs; add overloads for Block/Wakeup with CpuSchedData; add WakeupOne.
src/task/include/task_fsm.hpp	Add cached atomic state id to allow thread-safe state reads.
src/task/include/task_control_block.hpp	Add per-task SignalState storage.
src/task/include/scheduler_base.hpp	Declare kernel_thread_bootstrap for asm entry stubs.
src/task/exit.cpp	Move Wakeup out of scheduler lock; restructure leader reparenting timing.
src/task/block.cpp	Split Block into locked/unlocked variants; enforce capacity check before blocking.
src/task/CMakeLists.txt	Add signal.cpp to build.
src/task/AGENTS.md	Update docs to reflect Balance() implemented.
src/syscall.cpp	Dispatch + implement sys_kill/sys_sigaction/sys_sigprocmask.
src/memory/memory.cpp	Add bmalloc lock implementation for thread-safety.
src/memory/include/virtual_memory.hpp	Update doc to reflect supported arch list.
src/main.cpp	Remove demo tasks; add atomic boot guard for SMP entry.
src/libc/sk_stdlib.c	Remove x86_64/SSE path for strtod.
src/libc/include/sk_stdlib.h	Remove x86_64/SSE path for strtod declarations.
src/include/syscall.hpp	Add syscall numbers and declarations for signal + affinity syscalls; drop x86_64 syscall ids.
src/include/signal.hpp	Add signal types/constants/state helpers/default actions.
src/include/kernel_config.hpp	Increase task/scheduler/map capacities.
src/include/interrupt_base.h	Update docs to remove x86_64/APIC references.
src/include/expected.hpp	Remove APIC error codes; add signal error codes and messages.
src/filesystem/vfs/open.cpp	Call FileOps::Open during VFS open to prepare backend handle.
src/filesystem/vfs/include/vfs_types.hpp	Add default virtual FileOps::Open; comment cleanups.
src/filesystem/fatfs/include/fatfs.hpp	Declare FatFsFileOps::Open override.
src/filesystem/fatfs/fatfs.cpp	Handle FR_EXIST for mkdir; implement FatFS file Open hook.
src/arch/x86_64/timer.cpp	Remove x86_64 timer stub.
src/arch/x86_64/syscall.cpp	Remove x86_64 syscall stub.
src/arch/x86_64/switch.S	Remove x86_64 switch stub.
src/arch/x86_64/macro.S	Remove x86_64 macro stub.
src/arch/x86_64/interrupt_main.cpp	Remove x86_64 interrupt init implementation.
src/arch/x86_64/interrupt.cpp	Remove x86_64 interrupt implementation.
src/arch/x86_64/interrupt.S	Remove x86_64 interrupt asm stub.
src/arch/x86_64/include/sipi.h	Remove SIPI header.
src/arch/x86_64/include/interrupt.h	Remove x86_64 interrupt header.
src/arch/x86_64/early_console.cpp	Remove x86_64 early console.
src/arch/x86_64/boot.S	Remove x86_64 boot code.
src/arch/x86_64/backtrace.cpp	Remove x86_64 backtrace.
src/arch/x86_64/arch_main.cpp	Remove x86_64 arch init.
src/arch/x86_64/apic/io_apic.cpp	Remove x86_64 IO APIC driver.
src/arch/x86_64/apic/include/io_apic.h	Remove x86_64 IO APIC header.
src/arch/x86_64/apic/include/apic.h	Remove x86_64 APIC header.
src/arch/x86_64/apic/apic.cpp	Remove x86_64 APIC implementation.
src/arch/x86_64/apic/README.md	Remove x86_64 APIC docs.
src/arch/x86_64/apic/CMakeLists.txt	Remove APIC subdir build config.
src/arch/riscv64/timer.cpp	Deliver pending signals during timer tick handling.
src/arch/riscv64/switch.S	Route kernel thread entry through kernel_thread_bootstrap.
src/arch/riscv64/macro.S	Reduce saved context footprint (remove FP saves); adjust offsets.
src/arch/riscv64/link.ld	Comment cleanup in linker script.
src/arch/riscv64/interrupt.S	Fix offsets for sstatus.SPP check after context layout change.
src/arch/aarch64/timer.cpp	Deliver pending signals during timer tick handling.
src/arch/aarch64/switch.S	Route kernel thread entry through kernel_thread_bootstrap.
src/arch/aarch64/macro.S	Reduce saved context footprint (remove SIMD/FP saves); adjust offsets.
src/arch/aarch64/link.ld	Comment cleanup in linker script.
src/arch/aarch64/interrupt_main.cpp	Ignore spurious INTIDs (>=1020) early.
src/arch/aarch64/interrupt.cpp	Change EOIR write ordering relative to handler dispatch.
src/arch/aarch64/interrupt.S	Fix offsets used when checking return-to-user and restoring ttbr0_el1.
src/arch/README.md	Update docs to reflect only riscv64/aarch64 supported.
src/arch/CMakeLists.txt	Remove x86_64 arch subdir integration.
src/arch/AGENTS.md	Update docs to remove x86_64 references.
src/CMakeLists.txt	Remove x86_64 QEMU flags.
docs/docker.md	Update examples from x86_64 to riscv64; adjust QEMU/tool notes.
cmake/x86_64-gcc.cmake	Remove x86_64 toolchain file.
cmake/functions.cmake	Ensure /srv/tftp exists before linking artifacts.
cmake/compile_config.cmake	Remove x86_64 compile/link options.
cmake/3rd.cmake	Remove x86_64 U-Boot defconfig.
README_ENG.md	Update docs to remove x86_64 references.
README.md	Update docs to remove x86_64 references.
CMakePresets.json	Remove x86_64 preset; tweak QEMU flags/device; remove debug “int” logging.
AGENTS.md	Update top-level docs to remove x86_64 preset references.
3rd/cpu_io	Update cpu_io submodule revision.
.gitignore	Ignore .claude.
.github/workflows/workflow.yml	Split into riscv64/aarch64 jobs in container; add shallow submodule init and safe.directory config; publish docs via artifact.
.github/workflows/dev-image.yml	Add workflow to build/push devcontainer image to GHCR.
.devcontainer/devcontainer.json	Remove x86_64 assembly extension recommendation.
.devcontainer/Dockerfile	Update tool packages; remove qemu-system-x86 and x86_64 cross toolchain; ensure /srv/tftp exists.

Comments suppressed due to low confidence (2)

tests/system_test/main.cpp:1

• Same issue as in src/main.cpp: test_and_set(memory_order_acquire) doesn't provide release semantics to publish initialization to secondary cores. Use memory_order_acq_rel (or an explicit release/acquire pairing) to avoid subtle SMP startup races in the system test binary.
  src/task/task_manager.cpp:1
• GetQueueSize() is called across cores without holding the corresponding cpu_sched.lock. If the underlying ready queue size is not atomic/thread-safe, this is a data race (UB) even if used heuristically. A safer approach is to either (1) take the per-core lock before reading queue size, or (2) maintain an atomic per-core load counter updated under the lock and read atomically here.

[Copilot]

git config --global --add safe.directory '*' disables Git's ownership safety checks for all directories inside the container, which is overly broad for CI and can mask genuine repo ownership issues. Prefer adding only the workspace + submodule directories (e.g., add $GITHUB_WORKSPACE and each submodule path via git submodule foreach --recursive ...) so the safety bypass is scoped to the checkout.

Suggested change

	git config --global --add safe.directory '*'
	git submodule update --init --recursive --depth 1
	git config --global --add safe.directory "$GITHUB_WORKSPACE"
	git submodule update --init --recursive --depth 1
	git submodule foreach --recursive 'git config --global --add safe.directory "$PWD"'

[Copilot]

The PR title/description focuses on a CI safe.directory fix for submodule checkout, but the diff includes large functional changes (scheduler balancing, signals, VFS open behavior, test expansion, and removal of x86_64 support). This makes the change hard to review/rollback and increases risk; consider splitting into focused PRs (CI-only vs kernel features vs arch support removal).

[Copilot]

EOI is being written before running the handler. On GICv3, signaling EOI early can allow the interrupt to be considered complete while the handler still runs, potentially enabling re-entrancy/priority issues and breaking device protocols. Write EOIR after the handler completes (and if the design requires it, also consider the required DIR write for deactivation, depending on your GIC configuration).

Suggested change

	interrupt_handlers_[cause](cause, context);
	cpu_io::ICC_EOIR1_EL1::Write(cause);