diff options
Diffstat (limited to 'arch/x86_64/Kconfig')
| -rw-r--r-- | arch/x86_64/Kconfig | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index 44ee7f6acf7..289f448ac89 100644 --- a/arch/x86_64/Kconfig +++ b/arch/x86_64/Kconfig @@ -303,6 +303,21 @@ config HPET_TIMER as it is off-chip. You can find the HPET spec at <http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>. +config X86_PM_TIMER + bool "PM timer" + depends on ACPI + default y + help + Support the ACPI PM timer for time keeping. This is slow, + but is useful on some chipsets without HPET on systems with more + than one CPU. On a single processor or single socket multi core + system it is normally not required. + When the PM timer is active 64bit vsyscalls are disabled + and should not be enabled (/proc/sys/kernel/vsyscall64 should + not be changed). + The kernel selects the PM timer only as a last resort, so it is + useful to enable just in case. + config HPET_EMULATE_RTC bool "Provide RTC interrupt" depends on HPET_TIMER && RTC=y @@ -407,7 +422,7 @@ config PCI_DIRECT config PCI_MMCONFIG bool "Support mmconfig PCI config space access" - depends on PCI + depends on PCI && ACPI select ACPI_BOOT config UNORDERED_IO |