Lenovo G580 Pci Simple Communications Controller Driver
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PCI devices communicate with the computer using a command set. This command set has a defined set of commands that the PCI device driver can use to communicate with the external device. The commands are described in the industry standard PCI-8086 standard .
PCI has an industry standard for the configuration space of the PCI bus, which allows the operating system to communicate with the device driver and the external device connected to the PCI card.
Typically, the operating system will translate one or more interrupt requests from the device driver into a set of system interrupts, which it then delivers to the device driver. The device driver, in turn, uses the interrupt request to communicate with the external device that was attached to the PCI card.
For instance, a PCI card is connected to a computer's motherboard, and a set of expansion slots in the computer's case. The PCI card has an external connector that is plugged into an expansion slot. When the computer is turned on, the computer's operating system will have to run a device driver that interacts with the PCI card. The device driver's initialization process will also allocate a range of memory for the PCI card to use, and tell the operating system the address of that memory when the operating system attempts to read or write to the PCI card.
The operating system determines when it is appropriate to allocate memory to a device. If the device driver has requested memory, the operating system will allocate that memory to the device driver when it is needed. This memory is allocated by requesting a certain amount of memory from the kernel, which then sends the memory to the device driver. This is known as memory allocation .
The BIOS provides a basic interface between the computer and the devices that provide system input and output. This includes the keyboard and monitor. You can think of the BIOS as a gateway to the system and all of the devices that it controls:
The boot process -
The keyboard and mouse (as well as all other devices that need to be compatible with the BIOS) -
The monitor -
The hard drive
The CD-ROM drive
The floppy drive
And much more...
The PCI standard defines a low-level set of interfaces for each device and a high-level interface that allows the operating system to communicate with all of the devices and not worry about the details.
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