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Complete the kernel bootstrap by adding kexec of Linux from Fiwix.

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A tiny bootloader bootstrap has been added to compile the builder-hex0 kernel from hex0 source.
The boot compiler is builder-hex0-x86-stage1.hex0 and builder-hex0-x86-stage1.bin.
The builder-hex0 kernel is now named builder-hex0-x86-stage2.hex0.
The inclusion of a binary seed resolves the problem with the previous strategy which used an
architecture-specific hex0 compiler.

If sysb detects a full disk (i.e. DISK=sda) it now partitions the disk unconditionally because
previously fdisk was reporting existing but empty partitions which resulted in no
parititions being created.

e2fsprogs is now built with --disable-tls because musl was built on Fiwix without full threading
support and mkfs.ext4 was crashing without disabling thread local storage.

kexec-linux writes the linux kernel and initramfs to a RAM drive on Fiwix which ensure
a pre-allocated contiguous memory block. The following is written to the ram drive:
a 32-bit number which is the size of the kernel in bytes, a 32-bit number which is the size
of the initramfs in bytes, followed by the Linux kernel image, followed by the initramfs.

kexec-fiwix invokes a sync syscall to ensure all writes are flushed to
the ram drive and then initiates the kexec by shutting down Fiwix with a reboot syscall.
Fiwix knows whether and how to perform the kexec based on kernel parameters passed to it.
This commit is contained in:
rick-masters 2023-05-10 14:33:42 +00:00
parent e86db47b6e
commit a2fcf1ced9
23 changed files with 633 additions and 277 deletions
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14
sysb/run.sh
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@ -65,15 +65,15 @@ if [ -z "${DISK}" ] || ! [ -e "/dev/${DISK}" ]; then
echo "DISK=${DISK}" >> /usr/src/bootstrap.cfg
fi
# Is it a full disk, and not a partition
# Is it a full disk, and not a partition?
# shellcheck disable=SC2012
if [ $(($(ls -l "/dev/${DISK}" | sed "s/.*, *//" | sed "s/ .*//") % 8)) -eq 0 ]; then
if ! fdisk -l "/dev/${DISK}" | grep -qE "${DISK}p?[0-9]" ; then
echo "Creating partition table and partition"
echo ";" | sfdisk "/dev/${DISK}"
mkfs.ext4 "/dev/${DISK}1"
DISK="${DISK}1"
fi
echo "Creating partition table..."
echo ";" | sfdisk "/dev/${DISK}"
fdisk -l "/dev/${DISK}"
echo "Creating ext4 partition..."
mkfs.ext4 "/dev/${DISK}1"
DISK="${DISK}1"
fi
echo "export DISK=${DISK}" >> /usr/src/bootstrap.cfg