This chapter examines parts of
ipmi(4), the Intelligent Platform Management Interface (IPMI) driver. The IPMI specification defines a standard for monitoring and managing system hardware.
For our purposes, this description of IPMI is sufficient, as the point of this chapter is to demonstrate how PCI drivers such as
ipmi(4) employ PMIO and MMIO.
The code base for
ipmi(4) is composed of 10 source files and 1 header file. In this chapter, we’ll walk through one of these files, ipmi_pci.c, which contains code that’s related to the PCI bus.
Example 11-1 provides a ...