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65e80d25ca
freebsd-skq/sys
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rpaulo 65e80d25ca HPET: create /dev/hpetN as a way to access HPET from userland. 
In some cases, TSC is broken and special applications might benefit
from memory mapping HPET and reading the registers to count time.
Most often the main HPET counter is 32-bit only[1], so this only gives
the application a 300 second window based on the default HPET
interval.
Other applications, such as Intel's DPDK, expect /dev/hpet to be
present and use it to count time as well.

Although we have an almost userland version of gettimeofday() which
uses rdtsc in userland, it's not always possible to use it, depending
on how broken the multi-socket hardware is.

Install the acpi_hpet.h so that applications can use the HPET register
definitions.

[1] I haven't found a system where HPET's main counter uses more than
32 bit.  There seems to be a discrepancy in the Intel documentation
(claiming it's a 64-bit counter) and the actual implementation (a
32-bit counter in a 64-bit memory area).

MFC after:	1 week
Relnotes:	yes
2014-10-24 18:39:15 +00:00
..
amd64 amd64: make uiomove_fromphys functional for pages not mapped by the DMAP 2014-10-24 09:48:58 +00:00
arm Accept the documented FDT compatible string for the PL310 cache controller 2014-10-24 15:44:29 +00:00
boot Provide a character device allowing us to access BERI memory regions. 2014-10-22 11:30:03 +00:00
bsm
cam Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
cddl Whitespace 2014-10-24 03:34:21 +00:00
compat Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
conf xen: implement the privcmd user-space device 2014-10-22 17:07:20 +00:00
contrib Update the OFED Linux compatibility layer and 2014-10-15 13:40:29 +00:00
crypto Put the aesni_cipher_setup() and aesni_cipher_process() functions into 2014-06-24 06:55:49 +00:00
ddb ddb: ANSI-fy function declarations. 2014-10-12 18:01:52 +00:00
dev HPET: create /dev/hpetN as a way to access HPET from userland. 2014-10-24 18:39:15 +00:00
fs Clip the settings for the NFS rsize, wsize mount options 2014-10-22 22:27:51 +00:00
gdb Add support for gdb's memory searching capabilities to our in-kernel gdb 2014-09-05 16:40:47 +00:00
geom Populate the GELI passphrase cache with the kern.geom.eli.passphrase 2014-10-22 23:41:15 +00:00
gnu reiserfs: Use signed i_nlink 2014-09-25 19:10:32 +00:00
i386 Under PAE ULONG is insufficient for representing the physical memory size. Use QUAD 2014-10-23 21:02:40 +00:00
isa
kern In all cases except CTLTYPE_STRING, penv is NULL here, so passing it 2014-10-23 22:42:56 +00:00
kgssapi
libkern Add a complete implementation of MurmurHash3. Tweak both implementations 2014-10-18 22:15:11 +00:00
mips Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
modules Add VirtIO console driver 2014-10-23 04:47:32 +00:00
net Remove redundant check and m_pullup() call. 2014-10-24 13:34:22 +00:00
net80211 Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
netgraph Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
netinet Remove redundant check and m_pullup() call. 2014-10-24 13:34:22 +00:00
netinet6 Remove redundant check and m_pullup() call. 2014-10-24 13:34:22 +00:00
netipsec Use a static callout to drive key_timehandler() instead of timeout(). 2014-10-23 20:43:16 +00:00
netnatm
netpfil Bump default dynamic limit to 16k entries. 2014-10-24 13:57:15 +00:00
netsmb
nfs Follow up to r225617. In order to maximize the re-usability of kernel code 2014-10-16 18:04:43 +00:00
nfsclient Follow up to r225617. In order to maximize the re-usability of kernel code 2014-10-16 18:04:43 +00:00
nfsserver Change NFS readdir() to only ignore cookies preceding the given offset for 2014-07-01 20:00:35 +00:00
nlm
ofed Update the network interface baudrate integer according to the actual 2014-10-24 16:39:01 +00:00
opencrypto Fix build for kernels without COMPAT_FREEBSD32. 2014-09-22 17:32:27 +00:00
pc98 Merge pc98's machdep.c into i386/i386/machdep.c. 2014-10-04 06:01:30 +00:00
powerpc Use the UAUTO SYSCTL type for exporting the bounce zone alignment, 2014-10-21 21:04:44 +00:00
rpc Merge the NFSv4.1 server code in projects/nfsv4.1-server over 2014-07-01 20:47:16 +00:00
security Replace dev_clone with cdevpriv(9) KPI in audit_pipe code. 2014-08-20 16:04:30 +00:00
sparc64 Follow up to r225617. In order to maximize the re-usability of kernel code 2014-10-16 18:04:43 +00:00
sys vt(4): Add PIO_VFONT_DEFAULT ioctl to restore the default builtin font 2014-10-23 12:38:05 +00:00
teken
tools Allow the make_dtb script to work outside of a "make buildkernel" context 2014-08-30 22:39:15 +00:00
ufs Provide vfs suspension support only for filesystems which need it, take 2014-10-20 18:00:50 +00:00
vm Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
x86 xen: implement the privcmd user-space device 2014-10-22 17:07:20 +00:00
xdr
xen xen: implement the privcmd user-space device 2014-10-22 17:07:20 +00:00
Makefile Remove "pci" from CSCOPEDIRS. 2014-09-23 06:32:19 +00:00