osf1 man page for cpu

cpu(9v) 																   cpu(9v)

NAME
       cpu - Global Variable: Provides a unique logical processor-type family identifier

SYNOPSIS
       extern int cpu;

DESCRIPTION
       The  cpu  global  variable provides a unique logical family identifier of the processor type of the running system. The logical system name
       can represent a single processor or a family of processor types.  For example, the constant DEC_3000_500 represents the	DEC 3000 Model 500
       Alpha Workstation. The defined processor names appear in the following file: /usr/sys/include/arch/alpha/hal/cpuconf.h.

       You  use the cpu global variable to conditionally execute processor-specific code. For example, the following code fragment calls a system-
       specific initialization interface for the DEC 3000 Model 500 Alpha Workstation:
	.
	.
	.  if (cpu == DEC_3000_500) {
	       init_3000_500(); }
	.
	.
	.

																	   cpu(9v)