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HP StorageWorks 1000 - Modular Smart Array Technologie-Brief

Operating modes

AMD Opteron processors use three different operating modes: 64-bit long mode, 64-bit

compatibility mode, and 32-bit legacy mode. The 64-bit long mode requires a 64-bit OS and an

application recompiled to use the 64-bit registers. In other words, the full capabilities of the

expanded register set are available only when both the OS and the application support 64 bits.

The 64-bit compatibility mode requires a 64-bit OS, but can use a 32-bit application. The

additional registers are available to the OS, but not to the 32-bit application, because it cannot

make use of them. When running in legacy mode, the processor acts just like a 32-bit processor,

and the extra registers are not available (Table 2).

Table 2. Operating modes for AMD Opteron processors

Mode

OS required

64-bit long mode

64-bit OS

64-bit compatibility

64-bit OS

mode

32-bit legacy mode

32-bit OS

Memory addressability

The AMD Opteron registers are at least 64-bits wide. When operating in 64-bit long mode, the

AMD Opteron processors support up to 48 bits (256 Terabytes) for physical memory and use 64

bits for virtual memory

Naming conventions

First-generation single-core AMD Opteron processors (Socket 940 and Socket 939) have three-digit

model numbers in the form XZZ, and third-generation Quad-Core AMD Opteron processors (Socket

F and Socket AM2) have four-digit model numbers XYZZ. AMD Opteron processor "generations"

are called Revisions.

For all AMD Opteron processors, the first digit "X" specifies the number of CPUs on the target

machine:

• 1000 Series - Single-processor systems

• 2000 Series - Dual-processor systems

• 8000 Series - Systems with up to 8 processors

The second digit, Y, indicates socket generation, where "2" indicates Socket AM2 or Socket F

(1207). Series 12ZZ processors are based on Socket AM2; Series 22ZZ and 82ZZ processors are

based on Socket F (1207). If the second digit is "3," it stands for third-generation AMD Opteron

processors for Socket AM2 and Socket F (1207). If the second digit is "4," it indicates Six-Core

AMD Opteron processors.

From the document titled "AMD64 Architecture Programmer's Manual, Vol. 1: Application Programming,"

available at

www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/24592.pdf

Application

recompile required?

available?

Yes

Yes – to OS

No – to application

GPR width

(bits)