135 lines
4.5 KiB
Bash
135 lines
4.5 KiB
Bash
#!/bin/bash
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#
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# Build Linux 6.6 LTS bzImage for UTSM dual-kernel guest.
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#
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# Prerequisites:
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# - Linux build environment (WSL, native Linux, or Docker)
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# - gcc, make, bc, flex, bison, libelf-dev, libssl-dev
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# - ~3GB free disk space
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#
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# Usage:
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# cd CODE/linux
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# ./build.sh
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#
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# Output:
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# - SYSTEM/boot/linux-bzImage (kernel image)
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# - SYSTEM/boot/linux-initrd.img (minimal initramfs, if initramfs/ exists)
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set -e
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SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
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PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
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LINUX_SRC="${LINUX_SRC:-$SCRIPT_DIR/src}"
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OUTPUT_DIR="$PROJECT_ROOT/SYSTEM/boot"
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CONFIG_FILE="$SCRIPT_DIR/configs/utsm_x86_64_defconfig"
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INITRAMFS_DIR="$SCRIPT_DIR/initramfs"
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echo "[build] Linux kernel build for UTSM"
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echo "[build] Project root: $PROJECT_ROOT"
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echo "[build] Linux source: $LINUX_SRC"
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# 1. Clone Linux 6.6 LTS if not present
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if [ ! -d "$LINUX_SRC" ]; then
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echo "[build] Cloning Linux 6.6 LTS..."
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git clone --depth 1 --branch v6.6 \
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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git \
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"$LINUX_SRC"
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fi
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cd "$LINUX_SRC"
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# 2. Apply UTSM patches if any
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PATCH_DIR="$SCRIPT_DIR/patches"
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if [ -d "$PATCH_DIR" ] && [ "$(ls -A $PATCH_DIR 2>/dev/null)" ]; then
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echo "[build] Applying UTSM patches..."
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# 2a. Apply .patch files (if any)
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for patch in "$PATCH_DIR"/*.patch; do
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if [ -f "$patch" ]; then
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echo "[build] applying $(basename $patch)"
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git apply --check "$patch" 2>/dev/null && git apply "$patch" || \
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echo "[build] WARNING: $patch already applied or failed"
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fi
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done
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# 2b. Install UTSM driver source files into drivers/utsm/
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UTSM_DRV_DIR="$LINUX_SRC/drivers/utsm"
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echo "[build] installing UTSM driver into drivers/utsm/"
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mkdir -p "$UTSM_DRV_DIR/include"
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# Copy driver source, Kconfig, and Makefile
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cp "$PATCH_DIR/utsm_hcall.c" "$UTSM_DRV_DIR/utsm_hcall.c"
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cp "$PATCH_DIR/utsm_Kconfig" "$UTSM_DRV_DIR/Kconfig"
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cp "$PATCH_DIR/utsm_Makefile" "$UTSM_DRV_DIR/Makefile"
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# Copy shared IPC protocol header (included by both UTSM and Linux)
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cp "$PROJECT_ROOT/CODE/utsm-ipc/ipc_proto.h" "$UTSM_DRV_DIR/include/ipc_proto.h"
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# Add UTSM to drivers/Kconfig (if not already present)
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if ! grep -q "drivers/utsm/Kconfig" "$LINUX_SRC/drivers/Kconfig"; then
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echo '[build] adding source "drivers/utsm/Kconfig" to drivers/Kconfig'
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echo 'source "drivers/utsm/Kconfig"' >> "$LINUX_SRC/drivers/Kconfig"
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fi
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# Add UTSM to drivers/Makefile (if not already present)
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if ! grep -q "CONFIG_UTSM_HCALL" "$LINUX_SRC/drivers/Makefile"; then
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echo '[build] adding obj-$(CONFIG_UTSM_HCALL) += utsm/ to drivers/Makefile'
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echo 'obj-$(CONFIG_UTSM_HCALL) += utsm/' >> "$LINUX_SRC/drivers/Makefile"
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fi
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echo "[build] UTSM driver installed:"
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echo "[build] $UTSM_DRV_DIR/utsm_hcall.c"
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echo "[build] $UTSM_DRV_DIR/Kconfig"
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echo "[build] $UTSM_DRV_DIR/Makefile"
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echo "[build] $UTSM_DRV_DIR/include/ipc_proto.h"
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fi
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# 3. Configure
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echo "[build] Configuring kernel..."
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cp "$CONFIG_FILE" .config
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make olddefconfig
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# 4. Build bzImage
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echo "[build] Building bzImage (this may take 10-30 minutes)..."
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make -j"$(nproc)" bzImage
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# 5. Copy bzImage to SYSTEM/boot/
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mkdir -p "$OUTPUT_DIR"
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cp arch/x86/boot/bzImage "$OUTPUT_DIR/linux-bzImage"
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echo "[build] bzImage: $OUTPUT_DIR/linux-bzImage ($(du -h $OUTPUT_DIR/linux-bzImage | cut -f1))"
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# 6. Build initramfs if initramfs/ directory exists
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if [ -d "$INITRAMFS_DIR" ]; then
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echo "[build] Building initramfs..."
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# Create a minimal initramfs with busybox or a simple init
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INITRAMFS_TMP="$SCRIPT_DIR/initramfs.tmp"
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rm -rf "$INITRAMFS_TMP"
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mkdir -p "$INITRAMFS_TMP"
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# Copy initramfs contents
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cp -a "$INITRAMFS_DIR"/* "$INITRAMFS_TMP"/
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# Create init script if not present
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if [ ! -f "$INITRAMFS_TMP/init" ]; then
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cat > "$INITRAMFS_TMP/init" <<'INITEOF'
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#!/bin/sh
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mount -t proc none /proc
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mount -t sysfs none /sys
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mount -t devtmpfs none /dev
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echo "[utsm-linux] Boot complete"
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echo "[utsm-linux] Console ready on /dev/hvc0 (virtio-console)"
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exec /bin/sh
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INITEOF
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chmod +x "$INITRAMFS_TMP/init"
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fi
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# Pack initramfs
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cd "$INITRAMFS_TMP"
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find . | cpio -H newc -o | gzip -9 > "$OUTPUT_DIR/linux-initrd.img"
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echo "[build] initrd: $OUTPUT_DIR/linux-initrd.img ($(du -h $OUTPUT_DIR/linux-initrd.img | cut -f1))"
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cd "$LINUX_SRC"
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fi
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echo "[build] Done. Copy linux-bzImage (and linux-initrd.img) to your FAT32 image."
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echo "[build] Limine will load them as boot modules for UTSM."
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