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222 lines
7.1 KiB
Plaintext
222 lines
7.1 KiB
Plaintext
This repository contains the port of L4Linux/L4Android for Genode.
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L4Linux is a para-virtualized version of Linux running on top of the
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micro-kernel Fiasco.OC. The original code uses the L4RE framework. This package
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contains a small L4Linux support library as well as a patch for L4Linux, that
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replaces L4RE by the Genode framework. Nevertheless, L4Linux stays to be
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dependent on Fiasco.OC, meaning that you can only use it in combination with
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Genode running on top of Fiasco.OC.
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L4Android is a fork of L4Linux which in addition comprises the Android kernel
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patches.
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Quickstart
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==========
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L4Linux on Genode/Fiasco.OC IA32
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----------------------------------
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Prepare this repository:
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! make prepare
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Create a new build-directory:
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! <path_to_genode_repo>/tool/create_builddir foc_x86_32 BUILD_DIR=l4linux
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Edit the 'etc/build.conf' file in your build directory, and uncomment the following
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lines:
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! REPOSITORIES += $(GENODE_DIR)/ports-foc
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! REPOSITORIES += $(GENODE_DIR)/dde_ipxe
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Optionally, add an appropriate '-j' option to the make command in the same file:
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! MAKE += -j4
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Go to your newly created build directory, and execute the run-script for L4Android:
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! make run/l4linux
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L4Android on Genode/Fiasco.OC IA32
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----------------------------------
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Prepare this repository:
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! make prepare TARGET=l4android
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Create a new build-directory:
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! <path_to_genode_repo>/tool/create_builddir foc_x86_32 BUILD_DIR=l4android
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Edit the 'etc/build.conf' file in your build directory, and uncomment the following
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lines:
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! REPOSITORIES += $(GENODE_DIR)/ports-foc
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! REPOSITORIES += $(GENODE_DIR)/dde_gpxe
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Please do not forget to issue 'make prepare' in the 'dde_ipxe' and 'base-foc'
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repositories.
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Optionally, add an appropriate '-j' option to the make command in the same file:
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! MAKE += -j4
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Normally, Genode applications for Fiasco.OC are started without KVM support in
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Qemu as we ran into trouble with KVM/Fiasco.OC in the past. Nevertheless, using
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Android without KVM-support gets sometimes painful with regard to the boot-time,
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so feel to add the following line in 'etc/build.conf':
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! QEMU_OPT = -no-kvm-irqchip
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Go to your newly created build directory, and execute the run-script for L4Android:
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! make run/l4android
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That's it! In addition to using the graphical interface of Android in the framebuffer
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window, provided by Qemu, you can use a Linux shell in the terminal
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that runs the 'make' command, and you can connect to the Fiasco.OC's kernel debugger
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via a serial connection that is established as a pipe in '/tmp/qemu-pipe'.
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Detailed instructions
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=====================
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Fiasco.OC prerequisites
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-----------------------
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If you haven't build Genode for Fiasco.OC yet, please refer to the following
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document:
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:[http://genode.org/community/wiki/GenodeOnFiascoOC - Genode on Fiasco.OC Wiki page]:
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This Wiki page contains the information on how to build and use
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Genode with Fiasco.OC
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Preparing the L4Linux/L4android kernel source code
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--------------------------------------------------
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For building L4Linux for Genode, you first need to checkout and patch the
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original sources. The top-level makefile of this repository automates this
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task. Just issue:
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! make prepare
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If you like to build the L4Android kernel version as well, additionally type:
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! make prepare TARGET=l4android
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Afterwards you need to include the L4Linux repository into the Genode build
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process. Just add the path to this directory to the 'REPOSITORIES' declaration
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of the 'etc/build.conf' file within your build directory.
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Building and running L4Linux/L4android
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--------------------------------------
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Now, you can change to your build directory and issue:
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! make l4linux
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If you want to build the L4Android kernel, instead type:
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! make l4android
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The 'bin/' directory within your build directory should now contain a symbolic
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link to the L4Linux resp. L4Android binary.
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To test your Linux binary, you also need to tweak the config file for init and
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potentially your bootloader script. You will find examples for this in the
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'config/' directory of this repository.
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For a quick test of running L4Linux with Genode you can execute the Genode run
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script 'ports-foc/run/l4linux.run' or 'ports-foc/run/l4android.run' by issuing
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one of the following commands from the Genode build directory:
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! make run/l4linux
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or:
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! make run/l4android
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The run script will build all executables including the L4Linux kernel,
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downloads necessary system images, performs the integration of all components
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into a bootable image, and boot the image in Qemu. To inspect those individual
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steps more closely, please refer to the run script and the Fiasco.OC specific
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run environment implemented in 'base-foc/run/env'.
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Kernel command line
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-------------------
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You can state the Linux kernel command line by using the XML configuration of
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the start entry of your Linux instance, e.g.:
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! <config args="mem=64M l4x_rd=initrd.gz"/>
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Nic session connection
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----------------------
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When you provide a nic service to your L4Linux instance, the kernel will auto-detect
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that, and runs a nic-driver, which will provide the nic-session as ethernet device
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'eth0'. Currently, only one nic-session per instance is supported.
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Terminal session
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----------------
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When providing a terminal-session to your Linux instance, it will automatically
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register an appropriated serial and console driver in the kernel, that is
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available as device 'ttyS0'. Currently, only one such device instance is supported.
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Block session connection
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------------------------
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To use a block session of the underlying Genode system, we provide a special
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block-driver stub in L4Linux. You need to state how much block devices you want
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to use, and their name internally used by Linux, e.g.:
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! <config>
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! <block name="sda"/>
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! <block name="sdb"/>
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! <config/>
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Initramfs
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---------
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If you need to start Linux with an initramfs, you have to provide the name of the
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archive within the kernel command line, such as:
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! "l4x_rd=initrd.gz"
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You can find a working example initramfs for here:
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:[http://genode.org/files/release-11.11/l4lx/initrd-ia32.gz]
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_initramfs for the x86 architecture_
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:[http://genode.org/files/release-11.11/l4lx/initrd-arm.gz]
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_initramfs for the ARM architecture_
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Configuring Linux
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-----------------
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This L4Linux package contains a minimal Linux configuration that should work
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out of the box. Hardware drivers are disabled as Genode doesn't allow Linux
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to directly access device hardware. If you want to enable/disable options in
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Linux, you can do so by using the normal Linux build system. You will find the
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'.config' file Linux is using within the 'l4linux/' directory of your build
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directory. If you don't want to tweak '.config' directly, you can also change
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to the 'l4linux/' directory of your build directory and issue:
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! make menuconfig
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Then you will get the well known ncurses interface.
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When manually changing the Linux configuration for ARM platforms, you need
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to additionally specify the corresponding 'L4ARCH' value at the command line:
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! make menuconfig L4ARCH=arm
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Troubleshooting
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---------------
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If you run into problems when building L4Linux and you want the build process
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to be somehow more verbose, you can build L4Linux this way:
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! VERBOSE_LX_MK=1 make l4linux
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