| config X86 |
| select 64BIT |
| def_bool y |
| |
| config X86_64 |
| def_bool 64BIT |
| |
| menu "x86 Options" |
| |
| config PCI_VERBOSE |
| bool "Verbose PCI Output" |
| default n |
| help |
| Will print out extra information related to PCI. |
| |
| config NOFASTCALL_FSBASE |
| depends on X86_64 |
| bool "Disable fastcall to set FS base" |
| default n |
| help |
| Disable the fast path syscall to set FS base. If your hardware allows |
| setting FS base from userspace, you can say y to disable the fastcall |
| for a slight improvement for all syscalls. If unsure, say n. |
| |
| endmenu |
| |
| menu "x86 Hacks" |
| |
| config LOUSY_LAPIC_TIMER |
| bool "Lousy Local APIC Timer" |
| default n |
| help |
| This turns our one-shot APIC timer into a periodic timer. If your |
| system seems to lock up until you hit the keyboard, say 'Y' here and |
| report the results. |
| |
| Qemu without KVM had issues firing a one-shot LAPIC timer (the timer IRQ |
| would only go off when some other IRQ fired), but it worked with a |
| periodic tick. Since we aggressively disarm the timer, this config |
| shouldn't be a performance hit. |
| |
| config NOMTRRS |
| bool "Disable MTRRs" |
| default y |
| help |
| Old debug option from when we were having issues with MTRRs. If your |
| machine won't boot, try turning this on. |
| |
| config KB_CORE0_ONLY |
| bool "Keyboard from core0 only" |
| default n |
| help |
| Say 'n' unless you are using a buggy x86 machine that can't handle |
| polling the keyboard PIO from cores other than core 0. |
| |
| config X86_DISABLE_KEYBOARD |
| bool "Disable Keyboard" |
| default n |
| help |
| x86 machines with a legacy USB keyboard often implement the USB stack |
| in SMM mode. When doing anything with the keyboard, including polling |
| the keyboard from the kernel monitor, SMM mode can dramatically |
| interfere with other cores (like a 10-15x performance impact on some |
| benchmarks). |
| |
| Say 'y' if you have such a machine and do not need the keyboard. |
| |
| config ENABLE_LEGACY_USB |
| bool "Enable Legacy USB" |
| default n |
| help |
| Say 'y' if you want to use a USB keyboard. Given that we do not have a |
| USB stack, disabling legacy USB means USB keyboards will not work. We |
| disable legacy USB by default, since our primary console communication |
| is serial, and legacy USB support results in SMM interference that |
| affects all cores. |
| |
| endmenu |
