alistair23-linux/arch/x86
Linus Torvalds a6a80e1d8c Fix potential fast PIT TSC calibration startup glitch
During bootup, when we reprogram the PIT (programmable interval timer)
to start counting down from 0xffff in order to use it for the fast TSC
calibration, we should also make sure to delay a bit afterwards to allow
the PIT hardware to actually start counting with the new value.

That will happens at the next CLK pulse (1.193182 MHz), so the easiest
way to do that is to just wait at least one microsecond after
programming the new PIT counter value.  We do that by just reading the
counter value back once - which will take about 2us on PC hardware.

Reported-and-tested-by: john stultz <johnstul@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-17 07:58:26 -07:00
..
boot x86 setup: fix asm constraints in vesa_store_edid 2009-01-30 23:55:25 +01:00
configs eeprom: More consistent symbol names 2009-01-26 21:19:57 +01:00
crypto
ia32 x86-64: fix int $0x80 -ENOSYS return 2009-02-06 18:22:29 -08:00
include/asm x86, math-emu: fix init_fpu for task != current 2009-03-04 20:33:16 +01:00
kernel Fix potential fast PIT TSC calibration startup glitch 2009-03-17 07:58:26 -07:00
kvm KVM: VMX: Flush volatile msrs before emulating rdmsr 2009-02-15 02:47:39 +02:00
lguest lguest: fix for CONFIG_SPARSE_IRQ=y 2009-03-09 10:06:29 +10:30
lib x86: use early clobbers in usercopy*.c 2009-01-21 09:43:17 +01:00
mach-default x86: Add IRQF_TIMER to legacy x86 timer interrupt descriptors 2009-02-22 10:27:49 -08:00
mach-generic
mach-rdc321x
mach-voyager x86, Voyager: fix compile by lifting the degeneracy of phys_cpu_present_map 2009-02-24 12:50:11 -08:00
math-emu x86, math-emu: fix init_fpu for task != current 2009-03-04 20:33:16 +01:00
mm x86: work around Fedora-11 x86-32 kernel failures on Intel Atom CPUs 2009-03-11 18:22:03 +01:00
oprofile x86: oprofile: don't set counter width from cpuid on Core2 2009-03-03 12:04:22 +01:00
pci PCI: irq and pci_ids patch for Intel Tigerpoint DeviceIDs 2009-01-27 09:46:08 -08:00
power
vdso
video
xen xen: disable interrupts early, as start_kernel expects 2009-02-25 18:51:57 +01:00
Kconfig x86: enable DMAR by default 2009-02-26 20:59:47 +01:00
Kconfig.cpu x86/Kconfig.cpu: make Kconfig help readable in the console 2009-02-04 22:19:27 +01:00
Kconfig.debug trace: mmiotrace to the tracer menu in Kconfig 2009-02-15 20:03:28 +01:00
Makefile
Makefile_32.cpu