rs-dos/tools/qemu.sh, branch qemu

fix(rsdos): organizational changes

2026-07-31T01:22:20Z

interrupts: IDT, PIC remap, PIT timer, PS/2 keyboard IRQ

2026-07-31T00:28:10Z

- IDT with 256 entries, loaded via lidt (CS read from current context) - PIC 8259A remapped to vectors 32-47, timer+keyboard IRQs unmasked - PIT channel 0 at ~100 Hz (mode 2, rate generator) - PS/2 keyboard IRQ (IRQ1 → vector 33): reads port 0x60, pushes byte to lock-free SPSC ring buffer - Timer IRQ (IRQ0 → vector 32): sends EOI, increments tick counter - ps2::poll_key() now reads from ring buffer with cli/sti+hlt for race-free sleep (instead of busy-polling the data port) - build.rs: use idiomatic Result<_, Box> return type - tools/qemu.sh: fix SC2207 shellcheck warning

Initial commit: raisernics toy kernel

2026-07-31T00:18:30Z

- Bare-metal x86_64 UEFI kernel (PE32+, no libc) - GOP framebuffer + 8x16 bitmap font - PS/2 keyboard (polling, scancode set 1) - UART 16550 serial driver (COM1, 115200 8N1) - Bump allocator as #[global_allocator] (alloc::String, Vec, format!) - UEFI memory map capture (static buffer, ADR 0001) - Shell with 7 commands (help, echo, clear, hello, info, mem, halt) - Dual output: GOP framebuffer + serial console - Makefile: run, run-gui, debug, release, image targets - tools/: qemu.sh, boot-image.sh, debug-kernel.py