freebsd-dev/sys/x86
Konstantin Belousov ce3bf75015 Do not access ISA timer if BIOS reports that there is no legacy
devices present.

On at least one machine where it would matter since the ISA timer is
power gated when booted in the UEFI mode, BIOS still reports that the
legacy devices are present.  That is, user still have to manually
disable TSC calibration on such machines.  Hopefully it will be more
useful in the future.

Discussed with:	Ben Widawsky <benjamin.widawsky@intel.com>
Reviewed by:	royger
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D16004
MFC after:	1 week
2018-06-25 11:24:26 +00:00
..
acpica add support for console resuming, implement it for uart, use on x86 2018-05-29 16:16:24 +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 Provide a helper function acpi_get_fadt_bootflags() to fetch the FADT 2018-06-25 11:01:12 +00:00
iommu Don't include DMAR map entry zone items in kernel dumps. 2018-02-18 16:03:50 +00:00
isa Provide a helper function acpi_get_fadt_bootflags() to fetch the FADT 2018-06-25 11:01:12 +00:00
pci Add ISA PNP tables to ISA drivers. Fix a few incidental comments. 2018-01-29 00:22:30 +00:00
x86 Do not access ISA timer if BIOS reports that there is no legacy 2018-06-25 11:24:26 +00:00
xen xen/pvh: allocate dbg_stack 2018-05-24 10:22:57 +00:00