Gabriel Kaszewski
38f20cc3c4
Complete microkernel boot pipeline: adapter loads only init + storage + display from disk. Init bootstraps all other servers by reading binaries from the storage server via IPC, parsing ELF, creating processes, mapping pages, and spawning threads. New syscalls: - CreateEndpoint: userspace endpoint creation with full capability grant - DebugPutchar: debug output to UART from userspace - MapPage: cross-process page mapping (init loads binaries into children) - SpawnThreadIn: spawn thread in another process via capability Key fixes: - Per-process L1 page tables for VPN[2]=0 (prevents cross-process corruption) - Separate kernel_pt from page_tables[0] (init pid=0 overwrote kernel PT ref) - Thread Running state set in switch_to_next (syscalls rejected without it) - Pending IPC results applied during context switch - SIE disabled during boot (timer can't preempt into unready processes) - User heap VA starts at 0x40000 (avoids shared buffer at 0x30000) - RequestPages maps at user VAs via per-process heap allocator VirtIO GPU: - Adapter probes for GPU device, initializes resource/scanout/backing - Display server writes to mapped framebuffer, flushes via GPU virtqueue - 640x480 BGRA framebuffer with transfer-to-host and resource-flush Storage server: - Userspace VirtIO block driver using pre-mapped MMIO and DMA pages - FAT16 filesystem reader serving file-read requests via IPC - Shared buffer protocol: init writes filename, storage writes file data Echo app for IPC testing (adapter-loaded echo proved the pipeline end-to-end).
38 lines
965 B
Bash
Executable File
38 lines
965 B
Bash
Executable File
#!/bin/bash
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set -euo pipefail
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IMG="boot.img"
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IMG_SIZE_KB=4096
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TARGET="riscv64gc-unknown-none-elf"
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BUILD_DIR="target/${TARGET}/release"
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echo "=== Creating k-os boot disk image ==="
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dd if=/dev/zero of="${IMG}" bs=1K count=${IMG_SIZE_KB} 2>/dev/null
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mformat -i "${IMG}" -t 8 -h 2 -s 32 -r 16 -c 1 -M 512 ::
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echo "Created and formatted ${IMG} (${IMG_SIZE_KB}KB, FAT16)"
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# Copy with 8.3 names (no long filenames, no tilde mangling)
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copy() {
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local src="$1" dst="$2"
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if [ -f "${BUILD_DIR}/${src}" ]; then
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mcopy -i "${IMG}" "${BUILD_DIR}/${src}" "::${dst}"
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echo " ${dst}"
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fi
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}
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copy init "init.elf"
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copy echo "echo.elf"
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copy snake "snake.elf"
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copy display-server "display.elf"
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copy input-server "input.elf"
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copy log-server "log.elf"
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copy permission-manager "permis.elf"
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copy storage-server "storage.elf"
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copy session-server "session.elf"
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echo ""
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echo "Disk contents:"
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mdir -i "${IMG}" ::
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echo "=== Done: ${IMG} ==="
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