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opnsense-src/sys
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Poul-Henning Kamp dad3b6c6fd Back in the good old days, PC's had random pieces of rock for 
frequency generation and what frequency the generated was anyones
guess.

In general the 32.768kHz RTC clock x-tal was the best, because that
was a regular wrist-watch Xtal, whereas the X-tal generating the
ISA bus frequency was much lower quality, often costing as much as
several cents a piece, so it made good sense to check the ISA bus
frequency against the RTC clock.

The other relevant property of those machines, is that they
typically had no more than 16MB RAM.

These days, CPU chips croak if their clocks are not tightly within
specs and all necessary frequencies are derived from the master
crystal by means if PLL's.

Considering that it takes on average 1.5 second to calibrate the
frequency of the i8254 counter, that more likely than not, we will
not actually use the result of the calibration, and as the final
clincher, we seldom use the i8254 for anything besides BEL in
syscons anyway, it has become time to drop the calibration code.

If you need to tell the system what frequency your i8254 runs,
you can do so from the loader using hw.i8254.freq or using the
sysctl kern.timecounter.tc.i8254.frequency.
2008-03-26 22:12:00 +00:00
..
amd64 Back in the good old days, PC's had random pieces of rock for 2008-03-26 22:12:00 +00:00
arm We need to prototype _start() as well, as we use it to test if we're running 2008-03-22 20:34:07 +00:00
boot Fix some "in in" typos in comments. 2008-03-26 07:32:08 +00:00
bsm Merge OpenBSM 1.0 changes to src/sys/bsm: 2007-10-29 18:47:25 +00:00
cam Locking in the ses_ioctl handler doesn't have to be so strict because 2008-03-17 17:18:16 +00:00
cddl Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00
compat Regen. 2008-03-26 15:24:02 +00:00
conf Back in the good old days, PC's had random pieces of rock for 2008-03-26 22:12:00 +00:00
contrib Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00
crypto Make test00 compilable again. 2008-01-15 18:34:47 +00:00
ddb enable dynamic addition of "show all" commands 2008-03-25 20:36:32 +00:00
dev Make speaker a pseudo device driver instead of attaching to a PnP id. 2008-03-26 21:33:41 +00:00
fs Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00
gdb Commit SYSINIT() ;-adding patch missed in previous pass. 2008-03-16 13:02:04 +00:00
geom Redefine G_PART_SCHEME_DECLARE() from populating a private linker set 2008-03-23 01:31:59 +00:00
gnu Fix a nit with the 'nofoo' options where 'foo' is mapped to 'nonofoo' 2008-03-26 20:48:07 +00:00
i4b Spelling fix for interupt -> interrupt 2007-10-12 06:03:46 +00:00
i386 Back in the good old days, PC's had random pieces of rock for 2008-03-26 22:12:00 +00:00
ia64 The "free-lance" timer in the i8254 is only used for the speaker 2008-03-26 20:09:21 +00:00
isa Back in the good old days, PC's had random pieces of rock for 2008-03-26 22:12:00 +00:00
kern The "free-lance" timer in the i8254 is only used for the speaker 2008-03-26 20:09:21 +00:00
libkern Add prototype for __cmpd2(). 2008-02-23 22:40:05 +00:00
modules Add support for Marvell Libertas 88W8335 based PCI network adapters. 2008-03-25 06:32:33 +00:00
net Add a comment explaining that we initialize the 'a' buffer for 2008-03-26 21:29:13 +00:00
net80211 Fix adhoc mode to scan all available channels for a bss to join 2008-02-29 04:07:07 +00:00
netatalk Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
netatm Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
netgraph Some minor code and math optimizations. 2008-03-26 21:19:03 +00:00
netinet Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
netinet6 Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
netipsec Fix a bug that when getting/dumping the soft lifetime we reported 2008-03-24 15:01:20 +00:00
netipx Make tcpstates[] static, and make sure TCPSTATES is defined before 2007-07-30 11:06:42 +00:00
netnatm s/destory/destroy/ (except for the code in contrib/). 2007-04-16 12:31:35 +00:00
netncp Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
netsmb Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
nfs Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
nfs4client Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00
nfsclient Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00
nfsserver Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
nlm Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00
opencrypto Make ftruncate a 'struct file' operation rather than a vnode operation. 2008-01-07 20:05:19 +00:00
pc98 Back in the good old days, PC's had random pieces of rock for 2008-03-26 22:12:00 +00:00
pccard
pci Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
powerpc The "free-lance" timer in the i8254 is only used for the speaker 2008-03-26 20:09:21 +00:00
rpc Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00
security In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
sparc64 The "free-lance" timer in the i8254 is only used for the speaker 2008-03-26 20:09:21 +00:00
sun4v Remove two variables which are handled MI now. 2008-03-26 20:28:52 +00:00
sys The "free-lance" timer in the i8254 is only used for the speaker 2008-03-26 20:09:21 +00:00
tools Introduce a standalone shell script for embedding MFS image. 2008-02-05 10:46:30 +00:00
ufs Fix a nit with the 'nofoo' options where 'foo' is mapped to 'nonofoo' 2008-03-26 20:48:07 +00:00
vm Do not dereference cdev->si_cdevsw, use the dev_refthread() to properly 2008-03-20 16:08:42 +00:00
xdr Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00
Makefile o Add boot, gdb, nfsserver and opencrypto dirs to CSCOPEDIRS; sort. 2008-01-23 08:50:34 +00:00