freebsd with flexible iflib nic queues
401e7fff61
At the front is btxldr, in the middle is BTX itself (our mini-kernel), and then the 'client' (loader.bin) which is the actual loader itself. boot2 just executes a raw ELF or a.out binary with the only setup provided being that a bootinfo structure is passed on the stack. Now, since loader.bin is a BTX client, the loader needs to be able to locate a BTX kernel for the client to execute in the context. Thus, just like pxelder, btxldr uses the a.out header on the loader binary to find the BTX kernel stored in the loader and set it up. It does _not_ just reuse the BTX kernel that boot2 invoked it with. This is because it can't assume that it will _have_ a "spare" BTX kernel lying around. For example, when cdboot loads the loader there isn't an existing BTX kernel. In fact, cdboot will only work with an a.out loader as well since it also "borrows" the BTX kernel in the loader binary (which it finds by parsing the a.out header) just as pxeldr does. The only difference between cdboot and pxeldr is where they get /boot/loader from. If we wanted to make /boot/loader be an actual ELF binary we would need to change the following utilites to handle that (and they all have to be able to handle locating the BTX kernel inside of an ELF binary somehow): - btxldr - pxeldr - cdboot If we didn't want to require a flag day but make the transition smooth then we need to be able to support both a.out and ELF versions of /boot/loader which isn't exactly trivial since all three of these utilities are written in assembly. Pointy-hat to: peter |
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| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| kerberosIV | ||
| lib | ||
| libexec | ||
| release | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.upgrade | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. kerberosIV KerberosIV (eBones) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html