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Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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The QEMU_BIOS parameter was meant to help on old QEMU installations
which did not support the proper fw_dynamic workflow. That being said,
old QEMU versions might also not implement the proper SBI specification,
or it may have other unexpected issues.
Hence, just remove the option and force people to have a sufficiently
recent QEMU version.
Finally, I have updated the SVG showing off a QEMU run.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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GDB actually needs the ELF executable to run a session with symbols
loaded in. Hence, do not remove the `fbos.elf` file after calling
`objcopy`.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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In order to run on real hardware, it's actually easier to re-use
workflows from existing bootloaders than loading things in memory
manually. In order to achieve this two things had to be settled:
1. The image has to have a Linux header as defined in the RISC-V port.
This header will be taken into consideration by bootloaders in order to
know where to jump, the image offset, the endianness of the image, etc.
2. The image cannot just be an ELF executable. Rather, we must translate
it into binary form via `objcopy`.
With all of this at hand, I was able to make the kernel run on a
Starfive VisionFive 2 board, and I have recorded an example so it's
available as documentation.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Instead of manually making a temporary directory, do it through
'mktemp', which feels cleaner.
Moreover, the base directory will now by named 'fbos' instead of the
cryptic 'tmp' one. This is quite relevant when you uncompress the
archive into another machine.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Even if it's tightly coupled with the kernel (e.g. identifying specific
tasks from the kernel), in the end it's a library and so it should be
placed accordingly.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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It was weird enough to have it in the 'kernel' directory, as it's way
more fitting to have it on 'lib'.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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In initrd tests, and in general, we only need to check that the function
did something. As in, that it set the entry addresses somewhere and did
not leave them NULL. This is going to be performed from now on on CI and
regular tests. And, just if you want to go the extra mile, we will run
specific tests that check on memory addresses but that are not
guaranteed to work.
This is to be replaced in the future by having some proper debugging
output. As in, having a message at kernel boot time specifying the
addresses being used among other info. This needs a more complex printk
utility, of course.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Scheduling is easier if there is an init process which does nothing.
This way we don't have to perform hacks in order to idle in S privilege
mode while touching special registers in weird ways.
For now this process is kind of costly since 'wfi' is not accepted in
this context, but this can be further tuned down in the future by
setting TW=1 on 'mstatus', or by handling the exception and allowing it
if it comes from the proper process.
All of that being said, there is still work to be done as things fail
when optimitzations are on.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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When creating the user space binaries I forgot about their proper names,
which is funny on its own. Anyways, let's get them the name they were
intended.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
alksjdlkajd
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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We expect a CPIO archive with the 'newc' format for the initrd. Parse
this archive from the given initrd address and fetch the address for
each ELF executable while also pairing which task correspond to which
ELF.
This commit leaves to do the actual parsing of the ELF file for each
task, while also leaving some string utilities to be refined.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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The binutils used in Ubuntu 24.04 has a crash when trying to link the
end binary, which is avoided when passing `-fno-PIE`. Since this is a
good idea anyways for the kernel in general, let's pass this flag always
and kill two birds with one stone.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Since the library code can now be exchanged between tests and the actual
kernel, there might be a missmatch when launching QEMU after calling
`make all`. Ensure that this cannot happen by calling `clean` on the
`qemu` target.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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The kernel entry has a pointer to the DTB blob as a parameter. From this
pointer we can parse the the DTB blob to find the properties
"chosen->linux,initrd-start" and "chosen->linux,initrd-start". These
properties are guaranteed to have 64-bit addresses which point where the
initrd is in memory, which we need to fetch the binaries to be loaded.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Bootstrap an init task which holds at least the initial stack that is to
be used when setting up the registers (such as `sp` and `tp`).
In order to guarantee that the stack and the rest of the registers are
set up correctly, this commit also provides a raw implementation of a
`printk` function.
Moreover, this commit also adds an argument that must be passed to
`start_kernel`, which is the pointer to the embedded `fdt` blob. This
argument will be used by later work so to fetch, at least, the base
address for the initial ram disk. This was also used to test that the
stack was working as expected.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Fix the following build error on a clean repository:
riscv64-suse-linux-ld: cannot open output file usr/bin/foo: No such file or directory
Fixes: d79436a1170e ("usr: Bootstrap the initramfs for the kernel")
Signed-off-by: Ricardo B. Marliere <rbm@suse.com>
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Introduce a sample `foo` program which already calls the
`write_and_block` system call which is yet to be implemented by this
kernel. Moreover, the same CPIO format is used for the initramfs as with
Linux, so we can pass it with QEMU without worries.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Load the debug symbols into the gdb session by simply passing the
executable file into gdb directly. Moreover, allow users of the gdb
target to provide an extra variable so to pass extra flags to gdb.
Moreover, this commit comes with other small cleanups on the Makefile,
like a proper ABI specifier,
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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This will ensure that the code style is preserved and that commits being
pushed at least build successfully.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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For now the base layout has been defined and we have a binary that is
properly reached through openSBI.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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