How does bios communicate

Suspend-to-disk is implemented in the OS most of the time as the OS can restore its state faster only the kernel state is reloaded, and program state swapped in when required, which is significantly faster than reloading the entire RAM , but the feature remains in the specification. For suspend, this is generally implemented so that executing one of the hardware writes then triggers an interrupt, which transfers control to the BIOS. The first is a series of services known as the UEFI runtime services.

The third is ACPI. ACPI provides configuration, power management and hardware data and code used by the OS to augment what the OS drivers can find out using an industry standard or device driver. For example, is there a special signal to control the hard drive power, or is there a special way to talk to the battery that isn't covered by a standard.

On top of what has been noted above, Intel is starting to swing the other way and build more in by providing out of band access to the hardware via Active Management Technology built into the bios and motherboard which can be controlled independently of the OS.

With these boards you can actually do a fair bit. Whether you consider it inbuilt or a second OS is another thing but as it has hardware on board and components in the bios, i'm sticking with inbuilt. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Learn more. What are the functions of the BIOS while the operating system is running?

Ask Question. Asked 9 years, 3 months ago. Active 5 years, 1 month ago. Viewed 14k times. Its two major procedures are determining what peripheral devices keyboard, mouse, disk drives, printers, video cards, etc. Bootstrap Loader — Process of locating the operating system. By itself, the BIOS is not an operating system. Skip to content Android Windows Linux Apple. We may revise this Privacy Notice through an updated posting.

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Sharing and Disclosure Pearson may disclose personal information, as follows: As required by law. Some of the other common tasks that the BIOS performs include:. The BIOS is special software that interfaces the major hardware components of your computer with the operating system.

It is usually stored on a Flash memory chip on the motherboard , but sometimes the chip is another type of ROM. The CMOS Setup provides detailed information particular to your system and can be altered as your system changes. The BIOS uses this information to modify or supplement its default programming as needed.

We will talk more about these settings later. Interrupt handlers are small pieces of software that act as translators between the hardware components and the operating system.