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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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4
sysa/kexec-fiwix/src/kexec-fiwix.c
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@ -77,10 +77,10 @@ int main() {
puts("Preparing multiboot info for kernel...");
char cmdline[256];
sprintf(cmdline, "fiwix console=/dev/ttyS0 root=/dev/ram0 ramdisksize=%d initrd=sysa.ext2", INITRD_MB * 1024);
sprintf(cmdline, "fiwix console=/dev/ttyS0 root=/dev/ram0 ramdisksize=%d initrd=sysa.ext2 kexec_proto=linux kexec_size=67000 kexec_cmdline=\"init=/init console=ttyS0\"", INITRD_MB * 1024);
char * boot_loader_name = "kexec-fiwix";
unsigned int next_avail_mem = 0x8000;
unsigned int next_avail_mem = 0x9800;
multiboot_info_t * pmultiboot_info = (multiboot_info_t *) next_avail_mem;
memset(pmultiboot_info, 0, sizeof(multiboot_info_t));