vasilito
660e3e001d
Sync the kernel fork with 10 upstream commits (context timer-separation with unblock_context/wakeup_context, dtb MMIO/bus-address translation + tests, event read_with_timeout support, proc wakeup paths, dup2 rewrite with rollback, futex Weak context_lock + unblock_context, memory/init ordering, and more). Satisfies the verify-fork-functions gate (11 previously-missing upstream functions now present). Conflicts resolved (5 files; 9 auto-merged): - src/syscall/futex.rs: took upstream's version wholesale (Weak context_lock, upgrade+unblock_context, TimeSpec::to_nanos, get_futex_stat, addr_space strong_count cleanup); re-applied the RB FUTEX_WAIT_MULTIPLE/FUTEX_REQUEUE implementations adapted to the Weak API, with wake-index bookkeeping preserved (Context::futex_wake_index survives in context.rs). - src/event.rs: merged EventQueue with both RB's fd-refcount refs and upstream's timeout_opt (init in new()); kept RB's EventCounter/ eventfd block; added upstream's read_with_timeout + EVENT_TIMEOUT_ID write handling; deduplicated EAGAIN/EINTR imports. - src/scheme/proc.rs: upstream imports minus UnmapVec (RB deleted that machinery from context/memory.rs — import-only dependency); ContextHandle::Start keeps RB's require_zero_offset + upstream's wakeup_context; FORCEKILL region takes upstream's is_dead()/being_sigkilled form. - src/syscall/fs.rs: took upstream's dup2 structure (natural self-dup-with-buf handling — preserves the relibc dup2(ft,ft, "refresh") semantic — plus rollback on insert failure), adapted to the fork's 4-arg duplicate_file and read/token_split conventions. - src/arch/aarch64/start.rs: kept upstream's new PageMapper/ acpi::init_before_mem/memory::init_mm init block. Verified: repo cook kernel --force-rebuild successful; verify-fork-functions.sh --no-fetch kernel passes.
Kernel
Redox OS Microkernel
Requirements
nasmneeds to be available on the PATH at build time.
Building The Documentation
Use this command:
cargo doc --open --target x86_64-unknown-none
Debugging
QEMU
Running QEMU with the -s flag will set up QEMU to listen on port 1234 for a GDB client to connect to it. To debug the redox kernel run.
make qemu gdb=yes
This will start a virtual machine with and listen on port 1234 for a GDB or LLDB client.
GDB
If you are going to use GDB, run these commands to load debug symbols and connect to your running kernel:
(gdb) symbol-file build/kernel.sym
(gdb) target remote localhost:1234
LLDB
If you are going to use LLDB, run these commands to start debugging:
(lldb) target create -s build/kernel.sym build/kernel
(lldb) gdb-remote localhost:1234
After connecting to your kernel you can set some interesting breakpoints and continue
the process. See your debuggers man page for more information on useful commands to run.
Notes
-
Always use
foo.get(n)instead offoo[n]and try to cover for the possibility ofOption::None. Doing the regular way may work fine for applications, but never in the kernel. No possible panics should ever exist in kernel space, because then the whole OS would just stop working. -
If you receive a kernel panic in QEMU, use
pkill qemu-systemto kill the frozen QEMU process.
How To Contribute
To learn how to contribute to this system component you need to read the following document:
Development
To learn how to do development with this system component inside the Redox build system you need to read the Build System and Coding and Building pages.
How To Build
To build this system component you need to download the Redox build system, you can learn how to do it on the Building Redox page.
This is necessary because they only work with cross-compilation to a Redox virtual machine, but you can do some testing from Linux.
Funding - Unix-style Signals and Process Management
This project is funded through NGI Zero Core, a fund established by NLnet with financial support from the European Commission's Next Generation Internet program. Learn more at the NLnet project page.
