IP address space of the PCI device

IP address space of the PCI device

There are three address spaces on the PCI device:Pci I/O space, PCI storage space, and PCI configuration space. The CPU can access all the address spaces on the PCI device. The I/O space and storage space are provided to the device driver, and the configuration space is used by the PCI initialization code in the Linux kernel. At startup, the kernel initializes all PCI devices and configures all PCI devices, including the interrupt number and I/O base address, and list all the PCI devices found in the file/proc/PCI, as well as the parameters and properties of these devices.