diff options
author | Alejandro Hernandez Samaniego <alejandro@enedino.org> | 2023-01-08 12:15:23 -0700 |
---|---|---|
committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2023-01-12 23:07:39 +0000 |
commit | 1dffd81b2991f90ab95cb36d8ff7626efd21434f (patch) | |
tree | f8a97a6009f7a040749367148443acf7ea4cd034 /meta-skeleton | |
parent | d1a52559670921389a66a4c26d37481d6611042a (diff) | |
download | openembedded-core-contrib-1dffd81b2991f90ab95cb36d8ff7626efd21434f.tar.gz |
baremetal-helloworld: Enable x86 and x86-64 ports
- The qemux86 port for helloworld-baremetal builds in the standard way, however,
it uses NASM syntax for the startup code, hence we include a dependency to
nasm-native, QEMU forces us to use an ELF file rather than a bin file to boot
from this architecture using the -kernel parameter.
- QEMU refuses to boot using the -kernel parameter for files containing an ELF64
header [1], instead, it requires a multiboot2 compatible image.
We could create an image that contains a multiboot2 header by piggybacking
into grub2-native, specifically grub-mkrescue, but it requires some extra
runtime dependencies (xorriso which is currently part of meta-oe), and assumes
a grub installation exists on the host.
Due to host contamination and dependency complications, we dont rely on grub2,
but rather do this process manually instead, the x86-64 port contains a stage1
bootloader, stage2 bootloader and a 64 bit baremetal app (multiboot2
compatible), booting into real (16 bit), protected (32 bit) and long (64 bit)
modes, eventually running the helloworld-baremetal app. This is the reason why
we need the code changes to use a separate Makefile, and create an image
specifically for qemux86-64.
$ runqemu nographic
Booting from ROM..
Hello OpenEmbedded on x86!
$ runqemu nographic
Starting Stage 1 Bootloader
Loading Stage 2 Bootloader
Stage 2 Loaded.
Jumping to Stage2 Bootloader
In Stage 2
Done
Hello OpenEmbedded on x86-64!
[1] https://gitlab.com/qemu-project/qemu/-/blob/v7.2.0/hw/i386/multiboot.c#L199
Signed-off-by: Alejandro Enedino Hernandez Samaniego <alejandro@enedino.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta-skeleton')
-rw-r--r-- | meta-skeleton/recipes-baremetal/baremetal-examples/baremetal-helloworld_git.bb | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/meta-skeleton/recipes-baremetal/baremetal-examples/baremetal-helloworld_git.bb b/meta-skeleton/recipes-baremetal/baremetal-examples/baremetal-helloworld_git.bb index d11e2e530e..fede17b0f0 100644 --- a/meta-skeleton/recipes-baremetal/baremetal-examples/baremetal-helloworld_git.bb +++ b/meta-skeleton/recipes-baremetal/baremetal-examples/baremetal-helloworld_git.bb @@ -4,7 +4,7 @@ DESCRIPTION = "These are introductory examples to showcase the use of QEMU to ru LICENSE = "MIT" LIC_FILES_CHKSUM = "file://LICENSE;md5=39346640a23c701e4f459e05f56f4449" -SRCREV = "31b4e5a337018b4a00a7426b0e5ed83b81df30c7" +SRCREV = "22016ecbb9fb6c5f3a7a06698aea7ff8a701c166" PV = "0.1+git${SRCPV}" SRC_URI = "git://github.com/aehs29/baremetal-helloqemu.git;protocol=https;branch=master" @@ -23,12 +23,15 @@ IMAGE_NAME_SUFFIX ?= "" inherit baremetal-image +# startup code for x86 uses NASM syntax +DEPENDS:qemux86:append = " nasm-native" + # These parameters are app specific for this example # This will be translated automatically to the architecture and # machine that QEMU uses on OE, e.g. -machine virt -cpu cortex-a57 # but the examples can also be run on other architectures/machines # such as vexpress-a15 by overriding the setting on the machine.conf -COMPATIBLE_MACHINE = "qemuarmv5|qemuarm|qemuarm64|qemuriscv64|qemuriscv32" +COMPATIBLE_MACHINE = "qemuarmv5|qemuarm|qemuarm64|qemuriscv64|qemuriscv32|qemux86|qemux86-64" BAREMETAL_QEMUARCH ?= "" BAREMETAL_QEMUARCH:qemuarmv5 = "versatile" @@ -36,9 +39,15 @@ BAREMETAL_QEMUARCH:qemuarm = "arm" BAREMETAL_QEMUARCH:qemuarm64 = "aarch64" BAREMETAL_QEMUARCH:qemuriscv64 = "riscv64" BAREMETAL_QEMUARCH:qemuriscv32 = "riscv32" +BAREMETAL_QEMUARCH:qemux86 = "x86" +BAREMETAL_QEMUARCH:qemux86-64 = "x86-64" EXTRA_OEMAKE:append = " QEMUARCH=${BAREMETAL_QEMUARCH} V=1" +# qemux86-64 uses a different Makefile +do_compile:prepend:qemux86-64(){ + cd x86-64 +} # Install binaries on the proper location for baremetal-image to fetch and deploy do_install(){ @@ -51,3 +60,12 @@ FILES:${PN} += " \ ${base_libdir}/firmware/${BAREMETAL_BINNAME}.bin \ ${base_libdir}/firmware/${BAREMETAL_BINNAME}.elf \ " + +# qemux86-64 boots from iso rather than -kernel, create image to boot from +do_image:append:qemux86-64(){ + dd if=/dev/zero of=${B}/build/img.iso bs=1M count=10 status=none + dd if=${B}/build/stage1.bin of=${B}/build/img.iso bs=512 count=1 conv=notrunc + dd if=${B}/build/stage2.bin of=${B}/build/img.iso bs=512 seek=1 count=64 conv=notrunc + dd if=${B}/build/hello_baremetal_x86-64.bin of=${B}/build/img.iso bs=512 seek=65 conv=notrunc + install ${B}/build/img.iso ${IMGDEPLOYDIR}/${IMAGE_LINK_NAME}.iso +} |