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Bruce Evans bed16055e7 Fixed misclassification of npx interrupts caused by npx_probe().
Dividing by 0 in order to check for irq13/exception16 delivery apparently
always causes an irq13 even if we have configured for exception16 (by
setting CR0_NE).  This was expected, but the timing of the irq13 was
unexpected.  Without CR0_NE, the irq13 is delivered synchronously at
least on my test machine, but with CR0_NE it is delivered a little
later (about 250 nsec) in PIC mode and much later (5000-10000 nsec)
in APIC mode.  So especially in APIC mode, the irq13 may arrive after
it is supposed to be shut down.  It should then be masked, but the
shutdown is incomplete, so the irq goes to a null handler that just
reports it as stray.  The fix is to wait a bit after dividing by 0 to
give a good chance of the irq13 being handled by its proper handler.

Removed the hack that was supposed to recover from the incomplete shutdown
of irq13.  The shutdown is now even more incomplete, or perhaps just
incomplete in a different way, but the hack now has no effect because
irq13 is edge triggered and handling of edge triggered interrupts is
now optimized by skipping their masking.  The hack only worked due
to it accidentally not losing races.

The incomplete shutdown of irq13 still allows unprivileged users to
generate a stray irq13 (except on systems where irq13 is actually used)
by unmasking an npx exception and causing one.  The exception gets
handled properly by the exception 16 handler.  A spurious irq13 is
delivered asynchronously but is harmless (as in the probe) because it
is almost perfectly not handled by the null interrupt handler.
Perfectly not handling it involves mainly not resetting the npx busy
latch.  This prevents further irq13's despite them not being masked in
the [A]PIC.
2004-06-06 15:17:44 +00:00
bin Plug file descriptor leak in implementation of -n option. 2004-06-05 02:32:21 +00:00
contrib FreeBSD-ify the manpage. Our inetd does not support bind-address:port syntax 2004-05-27 23:51:05 +00:00
crypto Regenerate. 2004-04-20 09:49:37 +00:00
etc Removed whitespace at BOF, EOL & EOF. 2004-06-06 11:46:29 +00:00
games Consistently credit President Truman as Harry S. Truman. 2004-06-01 09:45:16 +00:00
gnu Have /usr/bin/tar be a symlink to /usr/bin/gtar rather 2004-06-04 00:39:46 +00:00
include Use __isctype() instead of __istype() for iswdigit() and iswxdigit() for 2004-05-31 12:44:50 +00:00
kerberos5 Update version strings for Heimdal: 0.6 -> 0.6.1 2004-04-13 16:41:00 +00:00
lib Add fenv.h, fenv.c, and the associated documentation to the libm 2004-06-06 10:06:57 +00:00
libexec give out a little more information in case of a missing dependency 2004-05-28 00:05:28 +00:00
release mkisofs(8) is now installed by sysutils/cdrtools. 2004-06-02 22:21:15 +00:00
rescue Remove dangling raidctl reference 2004-03-16 13:42:23 +00:00
sbin Reapply traditionally lost fixes, fixed some more. 2004-06-05 20:22:15 +00:00
secure Import the openssl conf for arm. 2004-05-14 12:26:51 +00:00
share Add missing link. 2004-06-06 13:35:37 +00:00
sys Fixed misclassification of npx interrupts caused by npx_probe(). 2004-06-06 15:17:44 +00:00
tools Log the config name in the history file. 2004-06-05 11:09:34 +00:00
usr.bin s/latter/former/ 2004-06-05 09:35:44 +00:00
usr.sbin Markup nits. 2004-06-05 20:27:10 +00:00
COPYRIGHT Update the COPYRIGHT file to include FreeBSD's compilation copyright 2003-12-31 22:35:22 +00:00
installworld_newk Commit the first set of files for changing time_t on freebsd/sparc64 2004-03-03 19:36:20 +00:00
installworld_oldk Commit the first set of files for changing time_t on freebsd/sparc64 2004-03-03 19:36:20 +00:00
MAINTAINERS Add myself as maintainer for geom_nop, geom_stripe and geom(8). 2004-05-20 12:44:23 +00:00
Makefile Add a kernel-toolchain target which only builds the bits required to build 2004-04-13 13:42:01 +00:00
Makefile.inc1 Allow buildworld and friends to complete when make(1) is called 2004-05-17 16:19:51 +00:00
README KerberosIV de-orbit burn continues. Disconnect from "make world". 2003-03-08 10:01:26 +00:00
UPDATING Note the removal of the midi drivers. 2004-06-04 15:24:12 +00:00
UPDATING.64BTT Add a tip for people who are using database-related ports on a sparc64 2004-03-17 01:59:47 +00:00

This is the top level of the FreeBSD source directory.  This file
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For copyright information, please see the file COPYRIGHT in this
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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
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The sample kernel configuration files reside in the sys/<arch>/conf
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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.

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.

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usr.bin		User commands.

usr.sbin	System administration commands.


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  http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html