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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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3
rootfs.py
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@ -35,11 +35,12 @@ def create_configuration_file(args):
config.write(f"CHROOT_ONLY_SYSA={args.bwrap}\n")
config.write(f"UPDATE_CHECKSUMS={args.update_checksums}\n")
config.write(f"JOBS={args.cores}\n")
config.write("DISK=sda1\n")
config.write(f"INTERNAL_CI={args.internal_ci}\n")
if (args.bare_metal or args.qemu) and not args.kernel:
config.write("DISK=sda\n")
config.write("KERNEL_BOOTSTRAP=True\n")
else:
config.write("DISK=sda1\n")
config.write("KERNEL_BOOTSTRAP=False\n")
config.write(f"BUILD_KERNELS={args.update_checksums or args.build_kernels}\n")