[Buildroot] [PATCHv2 6/7] configs: add new qemu defconfig 'x86_multilib'

[Thomas De Schampheleire <patrickdepinguin@gmail.com>]

From: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>

Add a new qemu defconfig for an x86_64 target that will run an x86_64 kernel
but userspace in 32-bit (x86) mode, using BR2_KERNEL_ARCH_OVERRIDE.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
---

Note that the defconfig refers to a toolchain at
autobuild.buildroot.org, but is not yet present at that location.
I uploaded the toolchain temporarily to:
http://patrickdepinguin.com/ctng-6737cfaa8ce6-x86_multilib-glibc-gcc11.tar.xz
md5sum:b085c0d8f137c078f8f09d116d8364f8
sha256sum 2a5241d9274239532e44d37c65509931fbc120db5991412f946eb38176db4dc2



 board/qemu/x86_multilib/linux.config  | 57 +++++++++++++++++++++++++++
 board/qemu/x86_multilib/post-build.sh | 11 ++++++
 board/qemu/x86_multilib/readme.txt    |  7 ++++
 configs/qemu_x86_multilib_defconfig   | 26 ++++++++++++
 4 files changed, 101 insertions(+)
 create mode 100644 board/qemu/x86_multilib/linux.config
 create mode 100755 board/qemu/x86_multilib/post-build.sh
 create mode 100644 board/qemu/x86_multilib/readme.txt
 create mode 100644 configs/qemu_x86_multilib_defconfig

diff --git a/board/qemu/x86_multilib/linux.config b/board/qemu/x86_multilib/linux.config
new file mode 100644
index 0000000000..0ea9e53a06
--- /dev/null
+++ b/board/qemu/x86_multilib/linux.config
@@ -0,0 +1,57 @@
+CONFIG_SYSVIPC=y
+# CONFIG_USELIB is not set
+CONFIG_CGROUPS=y
+CONFIG_SMP=y
+CONFIG_HYPERVISOR_GUEST=y
+CONFIG_PARAVIRT=y
+CONFIG_IA32_EMULATION=y
+# CONFIG_COMPAT_32BIT_TIME is not set
+# CONFIG_GCC_PLUGINS is not set
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+# CONFIG_WIRELESS is not set
+CONFIG_PCI=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_SCSI_VIRTIO=y
+CONFIG_ATA=y
+CONFIG_ATA_PIIX=y
+CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_NET=y
+CONFIG_NE2K_PCI=y
+CONFIG_8139CP=y
+# CONFIG_WLAN is not set
+CONFIG_INPUT_EVDEV=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_HW_RANDOM_VIRTIO=m
+CONFIG_DRM=y
+CONFIG_DRM_QXL=y
+CONFIG_DRM_VIRTIO_GPU=y
+CONFIG_DRM_BOCHS=y
+CONFIG_SOUND=y
+CONFIG_SND=y
+CONFIG_SND_HDA_INTEL=y
+CONFIG_SND_HDA_GENERIC=y
+CONFIG_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_UHCI_HCD=y
+CONFIG_USB_STORAGE=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_BALLOON=y
+CONFIG_VIRTIO_INPUT=y
+CONFIG_VIRTIO_MMIO=y
+CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
+CONFIG_EXT4_FS=y
+CONFIG_AUTOFS4_FS=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_UNWINDER_FRAME_POINTER=y
diff --git a/board/qemu/x86_multilib/post-build.sh b/board/qemu/x86_multilib/post-build.sh
new file mode 100755
index 0000000000..bf83a002c2
--- /dev/null
+++ b/board/qemu/x86_multilib/post-build.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -u
+set -e
+
+# Add a console on tty1
+if [ -e ${TARGET_DIR}/etc/inittab ]; then
+    grep -qE '^tty1::' ${TARGET_DIR}/etc/inittab || \
+	sed -i '/GENERIC_SERIAL/a\
+tty1::respawn:/sbin/getty -L  tty1 0 vt100 # QEMU graphical window' ${TARGET_DIR}/etc/inittab
+fi
diff --git a/board/qemu/x86_multilib/readme.txt b/board/qemu/x86_multilib/readme.txt
new file mode 100644
index 0000000000..fbc8ae9a6a
--- /dev/null
+++ b/board/qemu/x86_multilib/readme.txt
@@ -0,0 +1,7 @@
+Run the emulation with:
+
+  qemu-system-x86_64 -M pc -kernel output/images/bzImage -drive file=output/images/rootfs.ext2,if=virtio,format=raw -append "rootwait root=/dev/vda console=tty1 console=ttyS0" -serial stdio -net nic,model=virtio -net user # qemu_x86_multilib_defconfig
+
+Optionally add -smp N to emulate a SMP system with N CPUs.
+
+The login prompt will appear in the graphical window.
diff --git a/configs/qemu_x86_multilib_defconfig b/configs/qemu_x86_multilib_defconfig
new file mode 100644
index 0000000000..1c3a8179c1
--- /dev/null
+++ b/configs/qemu_x86_multilib_defconfig
@@ -0,0 +1,26 @@
+BR2_KERNEL_ARCH_OVERRIDE="x86_64"
+BR2_x86_core2=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
+BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
+BR2_TOOLCHAIN_EXTERNAL_URL="http://autobuild.buildroot.org/toolchains/tarballs/ctng-6737cfaa8ce6-x86_multilib-glibc-gcc11.tar.xz"
+BR2_TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX="x86_64-multilib-linux-gnu"
+BR2_TOOLCHAIN_EXTERNAL_HEADERS_5_15=y
+BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y
+# BR2_TOOLCHAIN_EXTERNAL_INET_RPC is not set
+BR2_TOOLCHAIN_EXTERNAL_CXX=y
+BR2_TARGET_OPTIMIZATION="-m32"
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/qemu/x86_multilib/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/qemu/post-image.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_DEFCONFIG)"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15"
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86_multilib/linux.config"
+BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF=y
+BR2_TARGET_ROOTFS_EXT2=y
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_PACKAGE_HOST_QEMU=y
+BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
-- 
2.32.0

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