tree 7783c666ff16ce70022946c070dd058ae2a74989
parent 395628ef4ea12ff0748099f145363b5e33c69acb
author Alok Kataria <akataria@vmware.com> 1225740688 -0800
committer H. Peter Anvin <hpa@zytor.com> 1225740957 -0800

x86: VMware: Fix vmware_get_tsc code

Impact: Fix possible failure to calibrate the TSC on Vmware near 4 GHz

The current version of the code to get the tsc frequency from
the VMware hypervisor, will be broken on processor with frequency
(4G-1) HZ, because on such processors eax will have UINT_MAX
and that would be legitimate.
We instead check that EBX did change to decide if we were able to
read the frequency from the hypervisor.

Signed-off-by: Alok N Kataria <akataria@vmware.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>