Commit Graph

29 Commits

Author SHA1 Message Date
Robert Nordier
1165e4c9a4 Fix column alignment (whitespace-only change). 2000-12-19 00:17:36 +00:00
Robert Nordier
1ec5afb81e Add a magic number, for easier identification of boot0. At present,
this is used only by libdisk.
2000-12-12 17:27:35 +00:00
Robert Nordier
8c964b9bca Go back to occupying just a single sector, reverting r1.17 - r1.20.
Taking over the sector following the MBR causes problems on some
machines, and the actual gains are fairly small in terms of how
the space is presently used.

Since we need a number of further features (eg. handling extended
partitions) that can't be readily accommodated in the basic boot0
design anyway, rather choose to implement the additional stuff
separately and concentrate on compatibility rather than features
here.
2000-10-02 17:30:22 +00:00
Robert Nordier
ce6a6a0f90 Set MAINTAINER. 2000-10-02 17:23:16 +00:00
Robert Nordier
3348fae50d Correct BSD/OS slice type.
PR:           21099
Submitted by: Alan Clegg <abc@bsdi.com>
2000-09-09 18:05:22 +00:00
Robert Nordier
ff7ed3a234 Typo/spelling fixes. 2000-08-08 07:20:25 +00:00
John Baldwin
ab9e9f9d2d Argh! Fix a brainfart of mine. In the old boot0, we relocated ourself
to 0x600 via a 'rep movsw'.  Once that was done, %cx was zero, so we could
simply use 'movb' to update the lower byte of %cx in preparation for
zeroing out the fake partition entry used to boot to other drives via F5.
Well, in the new boot0, we don't actually relocate ourselves, instead it
is easier to create the fake partition entry first and then just use it to
get the BIOS to load all of boot0 into memory at 0x600.  However, since we
aren't doing the relocate code anymore, we don't know that %cx == 0 when
we hit the 'movb' to setup %cx for clearning the fake partition entry.
Thus, if %ch != 0 when the BIOS started boot0, then it would end up zeroing
a lot more memory than just 8 words.  The solution is to do a word move of
$8 into %cx.

Debugging help from:	David Wolfskill <dhw@whistle.com>
2000-08-04 22:37:21 +00:00
John Baldwin
4ae4202e70 Cleanup warnings. Most of these are signed/unsigned warnings, as well as
some added const's.
2000-08-03 09:14:02 +00:00
John Baldwin
f15da231c5 Oops. Remove some debugging code used to display a hexdump of the sector
we just loaded from the disk.  The code to call it was commented out, and
it easily fit into the extra sector, but remove it anyway as it is
unneeded.
2000-07-17 19:39:50 +00:00
John Baldwin
1dce5cb37f The new and improved boot0, v1.1. This version adds the following:
- Autodetection and support of the BIOS EDD extensions to work around the
  1024 cylinder limit on all but really ancient BIOS's.
- To work around some BIOS's which break when EDD is used with older drives,
  we only attempt to use EDD if the cylinder is > 1023.
- Since this new code required more space than we had left, expand boot0 to
  2 sectors (1024 bytes) in length.
- Add support for boot0 being multiple sectors using predefined constants.
  If boot0 needs to be extended in the future, all that is required is
  bumping the NUM_SECTORS constant.
- Now that we have more room to work with, add a few more fs type
  descriptions while making others more verbose.
2000-07-12 18:11:54 +00:00
John Baldwin
638bac9fc0 Clean up all of the 16-bit assembly code in the x86 bootstrap to work
with the new binutils.  Now that we have a decent assembler, all the old
m4 macros are no longer needed.  Instead, straight assembly can be used
since as(1) now understands 16-bit addressing, branches, etc.  Also,
several bugs have been fixed in as(1), allowing boot0.s to be further
cleaned up.
2000-05-23 12:18:49 +00:00
John Baldwin
773065b3b8 Switch to using the .code16 as(1) directive and using 16-bit assembly
code instead of using 32-bit code and having to just "know" that it's
really 16-bit instructions when things run.  This also allows the code
to use fewer macros and more actual assembly statements, which eases
maintenance.  Unfortunately, due to as(1) brokenness, we still use m4
macros for all 16-bit addresses, and all short jumps (i.e., 8-bit
relative addresses in the jump instruction) must be wrapped in .code32
directives to avoid useless bloat by as(1).  This also fixes a few
problems that were preventing boot0 from compiling with the latest
and greatest version of as(1).
2000-05-05 13:22:10 +00:00
Julian Elischer
d721abf23c Remove accidental cut&paste garbage in a comment. 1999-09-03 01:38:29 +00:00
Julian Elischer
14c457c23f Comment the boot manager. So I don't have to work it all out again :-)
Reviewed by:	rnordier@freebsd.org
1999-09-03 01:35:06 +00:00
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Robert Nordier
fad2f0e686 Recognise NetBSD slices.
Submitted by : Lars Koeller <lkoeller@cc.fh-lippe.de>
PR           : 12772
1999-07-24 17:40:40 +00:00
Robert Nordier
fc2ff140c2 Provide for enabling/disabling each slice individually. 1999-06-19 21:40:55 +00:00
Robert Nordier
97a62e386d Change active flag handling; sanity check passed drive number; pass
partition pointer to bootstrap; optimise away 10 bytes; cosmetics.
1999-06-18 21:49:18 +00:00
Robert Nordier
a3c69bbcf8 Save option, rather than slice, selected. This permits unattended
booting from other than drive 0, as the F5 keypress is saved and
"replayed."

Requested (some time ago) by: archie
1999-03-01 02:42:47 +00:00
Robert Nordier
5052aa25a1 Implement "setdrv" option 1999-02-26 14:51:14 +00:00
Robert Nordier
b956ca7ca4 Revise some comments and labels. 1998-12-05 11:58:33 +00:00
Robert Nordier
12c38b04f1 Drop EDD support detection, though retain configurable use of disk
packet interface.  Add booteasy-style F5 support.  Add no-update
option. Implement various space optimizations and consistency fixes.
1998-11-29 14:09:00 +00:00
Robert Nordier
4e108bf052 Make configurable (a) whether to use int 0x13 extensions; (b) timeout
value.  Ignore failure to update mbr sector.  Disable interrupts while
using extended registers.  Default to F1 not F2.
1998-10-19 19:13:53 +00:00
Robert Nordier
f59f5db544 Set BINMODE to 444. 1998-10-17 14:20:25 +00:00
Robert Nordier
8f65b6a695 Don't use an absolute path to objcopy.
Noticed by: Scott Mace <smace@intt.org>
1998-10-13 18:29:18 +00:00
Robert Nordier
0def18d819 Fix a typo.
Output another newline before invoking bootstrap.
1998-10-10 14:03:03 +00:00
Robert Nordier
4025ae9d2a Get this building as a.out or ELF.
With thanks to: jdp
1998-10-09 17:19:51 +00:00
Robert Nordier
09c7ea1cc8 Install in /boot. 1998-10-05 19:20:36 +00:00
Robert Nordier
264ba5c0fe boot0 is a booteasy (boot manager) workalike with EDD support. 1998-10-05 10:08:37 +00:00