From 76103215711d268b4b02f62e900f2be3032cf295 Mon Sep 17 00:00:00 2001
From: salmonik <salmonik@tuta.io>
Date: Fri, 31 Jul 2026 02:18:30 +0200
Subject: Initial commit: raisernics toy kernel

- 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
---
 tools/boot-image.sh | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100755 tools/boot-image.sh

(limited to 'tools/boot-image.sh')

diff --git a/tools/boot-image.sh b/tools/boot-image.sh
new file mode 100755
index 0000000..2592afa
--- /dev/null
+++ b/tools/boot-image.sh
@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# =============================================================================
+# tools/boot-image.sh — Create a bootable disk image from the ESP directory
+#
+# Produces a raw disk image (bootable via UEFI) for dd-ing to a USB stick
+# or attaching to QEMU as a hard disk.
+#
+# Usage:
+#   ./tools/boot-image.sh [output.img]
+#
+# Default output: raisernics.img
+# =============================================================================
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$SCRIPT_DIR"
+
+OUTPUT="${1:-raisernics.img}"
+ESP_DIR="${ESP_DIR:-esp}"
+MBR_SZ=1 # 1 MB reserved at start for GPT/pmbr
+SECTOR_SZ=512
+
+# Rebuild ESP if stale
+make all
+
+if [ ! -d "$ESP_DIR" ]; then
+	echo "ERROR: ESP directory '$ESP_DIR' not found. Run 'make all' first."
+	exit 1
+fi
+
+# Calculate required size: ESP contents + MBR gap + some slack
+ESP_SIZE_MB=$(du -sm "$ESP_DIR" 2>/dev/null | cut -f1 || echo 1)
+TOTAL_MB=$((ESP_SIZE_MB + MBR_SZ + 1)) # +1 MB slack
+
+echo "Creating ${TOTAL_MB} MB disk image: ${OUTPUT}"
+
+# Create empty image with MBR gap
+dd if=/dev/zero of="$OUTPUT" bs=1M count="$TOTAL_MB" status=none 2>/dev/null
+
+# Partition table: single GPT partition, type EFI System (C12A7328-F81F-11D2-BA4B-00A0C93EC93B)
+sgdisk --clear \
+	--new=1:${MBR_SZ}M:0 \
+	--typecode=1:C12A7328-F81F-11D2-BA4B-00A0C93EC93B \
+	--change-name=1:"raisernics" \
+	"$OUTPUT" >/dev/null
+
+# Find partition offset
+PART_START=$(sgdisk --info=1 "$OUTPUT" 2>/dev/null | grep "Partition start sector" | awk '{print $NF}')
+if [ -z "$PART_START" ]; then
+	PART_START=$((MBR_SZ * 1024 * 1024 / SECTOR_SZ))
+fi
+
+# Format as FAT32
+mformat -i "$OUTPUT"@$((PART_START * SECTOR_SZ)) -h 32 -s 32 -t "$((TOTAL_MB * 2))" >/dev/null 2>&1 || true
+
+# Copy the ESP contents onto the partition
+mcopy -i "$OUTPUT"@$((PART_START * SECTOR_SZ)) -s "$ESP_DIR"/* ::/ 2>/dev/null
+
+echo "  -> ${OUTPUT}  ($(ls -lh "$OUTPUT" | awk '{print $5}'))"
+echo ""
+echo "To write to USB:     sudo dd if=${OUTPUT} of=/dev/sdX bs=4M status=progress"
+echo "To test with QEMU:   qemu-system-x86_64 -bios <OVMF> -drive file=${OUTPUT},format=raw"
-- 
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