freebsd-dev/sys/x86
John Baldwin 7f7f6f85a1 Add a custom implementation of cpu_lock_delay() for x86.
Avoid using DELAY() since it can try to use spin locks on CPUs without
a P-state invariant TSC.  For cpu_lock_delay(), always use the TSC if
it exists (even if it is not P-state invariant) to delay for a
microsecond.  If the TSC does not exist, read from I/O port 0x84 to
delay instead.

PR:		228768
Reported by:	Roger Hammerstein <cheeky.m@live.com>
Reviewed by:	kib
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D17851
2018-11-05 22:54:03 +00:00
..
acpica Make it possible to disable NUMA support with a tunable. 2018-10-22 20:13:51 +00:00
bios sys/x86: further adoption of SPDX licensing ID tags. 2017-11-27 15:11:47 +00:00
cpufreq cpufreq: Remove error-prone table terminators in favor of automatic sizing 2018-04-14 03:15:05 +00:00
include Consolidate identical ELF auxargs type defintions. 2018-10-22 22:24:32 +00:00
iommu Add malloc_domainset(9) and _domainset variants to other allocator KPIs. 2018-10-30 18:26:34 +00:00
isa Fix a regression in r338360 when booting an x86 machine without APIC. 2018-09-17 17:18:54 +00:00
pci Add pci_early function to detect Intel stolen memory. 2018-10-31 23:17:00 +00:00
x86 Add a custom implementation of cpu_lock_delay() for x86. 2018-11-05 22:54:03 +00:00
xen Provide string functions for use before ifuncs get resolved. 2018-10-11 23:28:04 +00:00