64-bit Intel CPU
64-bit Intel CPU
- Subject: 64-bit Intel CPU
- From: SK <email@hidden>
- Date: Tue, 27 Feb 2007 09:24:11 -0800 (PST)
Hi
I bought a new MAC Pro with MAC OS X 10.4.8. Outside
the box in which system was bought, it says QuadCore
64-bit workstation. The System profiler shows - Dual
Core Intel Xeon, 2GHz, 2 Processors, 4 Cores.
Wrote a small program to execute CPUID and read an
MSR. The CPUID instruction with (EAX = 0x80000001)
indicates that EM64T is available (bit 29 of EDX).
But, the IA32_EFER MSR (0xC0000080) shows IA32e mode
is not enabled (bit 10 is 0).
Does this indicate CPU never switches to IA32e mode
(or 64-bit mode). So, how are the 64-bit applications
handled? For example, an application trying to read
register rax or r10, how is that handled?
Does MAC OS X, use the 64-bit mode of CPU?
Thanks
Santhosh
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