so far, and should probably be able to be made to work for the alpha
without too much trouble once it's connected up and my assumptions tested.
I think (but have not tested) it will also load "old" ELF kernels that
were not linked with DYNAMIC headers.
The module glue is yet to come. (oh fun.. :-)
It does not explicitly load symbols [yet]. The _DYNAMIC data contains a
runtime symbol set that ddb can use via ddb/db_kld.c. It'll be missing
some detail that stabs normally provides (eg: number of args to a function,
line numbers, etc). On the other hand, those minimal symbols will always
be available even on a stripped kernel.
This is mostly stolen from load_aout.c with some ideas from
alpha/libalpha/elf_freebsd.c.
- Use format-independant module allocator.
- Conditionalise ISA PnP support.
- Simplify PnP enumerator interface.
- Improve module/object searching.
- Add missing depend/install targets in BTX makefiles.
- Pass the kernel environment and module data in extended bootinfo fields.
- Add a pointer to the end of the kernel + modules in bootinfo.
- Fix parsing of old-style kernel arguments.
- Implement a new copyin/readin interface for loading modules.
This allows the module loaders to become MI, reducing code duplication.
- Simplify the search for an image activator for the loaded kernel.
- Use the common module management code for all module metadata.
- Add an 'unload' command that throws everything away.
- Move the a.out module loader to MI code, add support for a.out
kld modules.
Submitted by: Alpha changes fixed by Doug Rabson <dfr@freebsd.org>
'three-stage' bootstrap.
There are a number of caveats with the code in its current state:
- The i386 bootstrap only supports booting from a floppy.
- The kernel and kld do not yet know how to deal with the extended
information and module summary passed in.
- PnP-based autodetection and demand loading of modules is not implemented.
- i386 ELF kernel loading is not ready yet.
- The i386 bootstrap is loaded via an ugly blockmap.
On the alpha, both net- and disk-booting (SRM console machines only) is
supported. No blockmaps are used by this code.
Obtained from: Parts from the NetBSD/i386 standalone bootstrap.
