SCO OpenServer

archtobus(D3oddi)

archtobus -- extract bus type from architecture

Synopsis

#include <sys/arch.h>
#include <sys/ci/cidriver.h>

int archtobus(unsigned long arch);

Description

The archtobus function extracts the bus type for the current machine architecture from the value arch set up by the kernel.

Arguments

arch: Kernel value that defines the current machine architecture.

Return values

archtobus returns one of the following, defined in <sys/ci/cidriver.h>:

MP_ATBUS: bus is type AT or EISA (Industry Standard Architecture or Extended Industry Standard Architecture)
MP_MCABUS: bus is type MC (Micro Channel Architecture)
-1: bus is of unknown type

Usage

Context and synchronization

All contexts.

Hardware applicability

All

Version applicability

oddi: 2mp, 3, 3mp, 4, 4mp, 5, 5mp, 6, 6mp

SVR5 DDI compatibility

This function is not supported for DDI drivers. DDI drivers can determine the bus type for the current machine by calling the cm_getval(D3) function to access the CM_BRDBUSTYPE and CM_BUSTYPES parameters documented on the cm_params(D5) manual page.

References

all_io(D3oddi), pci_buspresent(D3oddi)

cm_params(D5)

``ODDI driver interface version for SCO OpenServer 5'' in HDK Technical Reference

Examples

archtobus can be used with all_io(D3oddi) to determine if all processors can perform device I/O, as follows:

   if (all_io(archtobus(arch)))
   	/* device I/O allowed on all processors */
   else
   	/* device I/O not allowed on all processors */