tree dc42c285ca15dc1901ef7f6ae268d583521300d5
parent d9f4bb27dbff2e40ec2e36eb8017c9dedce77f30
author Andre Przywara <andre.przywara@amd.com> 1253313049 +0200
committer Aurelien Jarno <aurelien@aurel32.net> 1254660394 +0200

target-i386: add RDTSCP support

RDTSCP reads the time stamp counter and atomically also the content
of a 32-bit MSR, which can be freely set by the OS. This allows CPU
local data to be queried by userspace.
Linux uses this to allow a fast implementation of the getcpu()
syscall, which uses the vsyscall page to avoid a context switch.
AMD CPUs since K8RevF and Intel CPUs since Nehalem support this
instruction.
RDTSCP is guarded by the RDTSCP CPUID bit (Fn8000_0001:EDX[27]).

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>