feat: add initial impl of efi-stub and kernel

tools/build_img.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+set -e
+
+IMG=disk.img
+SIZE=256M
+MNT=/tmp/$(tr -dc 'A-Za-z0-9' </dev/urandom | head -c 16)
+LIMINE_DIR=$HOME/Limine
+KERNEL=./yukiImage
+
+echo "[*] Creating disk image..."
+rm -f "$IMG"
+truncate -s "$SIZE" "$IMG"
+
+echo "[*] Creating GPT..."
+sgdisk -o "$IMG"
+
+echo "[*] Creating EFI System Partition..."
+sgdisk -n 1:2048:0 -t 1:ef00 -c 1:"EFI System Partition" "$IMG"
+partprobe
+echo "[*] Attaching loop device..."
+LOOP=$(sudo losetup --find --partscan --show "$IMG")
+sudo udevadm settle
+EFI_PART="${LOOP}p1"
+
+echo "[*] Formatting FAT32 ESP..."
+sudo mkfs.fat -F32 "$EFI_PART"
+
+echo "[*] Mounting..."
+mkdir -p "$MNT"
+sudo mount "$EFI_PART" "$MNT"
+
+echo "[*] Creating directory structure..."
+sudo mkdir -p "$MNT/EFI/BOOT"
+sudo mkdir -p "$MNT/boot"
+
+echo "[*] Installing Limine UEFI..."
+sudo cp "$LIMINE_DIR/BOOTX64.EFI" "$MNT/EFI/BOOT/BOOTX64.EFI"
+echo "[*] Copying kernel..."
+sudo cp "$KERNEL" "$MNT/boot/yukiImage"
+
+echo "[*] Writing limine.conf..."
+sudo tee "$MNT/boot/limine.conf" > /dev/null << 'EOF'
+timeout: 1
+
+/Yuki OS
+    protocol: efi
+    path: boot():/boot/yukiImage
+EOF
+
+echo "[*] Syncing..."
+sync
+
+echo "[*] Unmounting..."
+sudo umount "$MNT"
+sudo losetup -d "$LOOP"
+
+echo "[+] Done: $IMG created successfully"