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Adds the task module (process control block, PROCESS_TABLE,
round-robin scheduler, and iretq-based Ring 3 entry) and wires
set_syscall_kernel_stack into the scheduler so SYSCALL uses the
current process's kernel stack.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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syscall/mod.rs:
- Configure STAR (kernel CS=0x08, user base=0x10), LSTAR, SFMASK (clear IF),
EFER.SCE to enable the SYSCALL/SYSRET instruction pair
- Naked assembly entry stub: swapgs, save/restore user RSP via per-CPU static,
remap r10→rcx for Linux arg4 convention, call Rust syscall_handler, sysretq
- validate_user_ptr(): bounds check for all user pointers (0..USER_ADDR_MAX)
- set_syscall_kernel_stack(): for scheduler to update per-CPU kernel RSP
syscall/dispatch.rs:
- dispatch(): routes syscall numbers; unknown → -ENOSYS (never panics)
- sys_write(fd, buf, count): fd 1/2 → serial; validates user ptr; read_volatile
loop avoids Rust aliasing assumptions on untrusted memory
- sys_exit(): serial log + hlt_loop() placeholder; Phase 2.5 adds scheduling
lib.rs: register syscall::init() + syscall::init_kernel_stack() in strix_os::init()
All existing integration tests pass.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- Restructure GDT to add kernel_data/user_data/user_code in the order
required for SYSCALL/SYSRET ABI:
0x08 kernel code, 0x10 kernel data, 0x18 user data, 0x20 user code, 0x28 TSS
STAR MSR values: STAR[47:32]=0x08, STAR[63:48]=0x10
- Add TSS.privilege_stack_table[0] (RSP0) with 8 KiB static initial stack
for Ring3→Ring0 hardware interrupt transitions
- Expose GDT static and all Selectors fields as pub (needed by syscall module)
- Add set_kernel_stack(VirtAddr) for scheduler to update RSP0 per-process
- Grow HEAP_SIZE 100 KiB → 4 MiB to support process table + kernel stacks
- Fix pre-existing lifetime elision lint in allocator.rs
- Update flake.nix: add cpio, busybox, gdb, binutils, e2fsprogs
- Update NOTES.md with decisions and next steps
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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PLAN.md: Full 7-phase development roadmap with progress tracker, per-phase
tasks, integration test specs, security baseline, and dependency list.
NOTES.md: Running developer log for context recovery after session resets.
Documents key architecture decisions (GDT segment order, filesystem strategy,
heap sizing, syscall ABI).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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