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A hardware abstraction layer (HAL) is an abstraction layer, implemented in software, between the physical hardware of a computer and the software that runs on that computer. . Its function is to hide differences in hardware from most of the operating system kernel, so that most of the kernel-mode code does not need to be changed to run on systems with different hardwa
An operating system abstraction layer (OSAL) provides an application programming interface (API) to an abstract operating system making it easier and quicker to develop code for multiple software or hardware platforms. It can make an application less dependent on any one specific operating system.
HAL (Hardware Abstraction Layer or rather Hardware Annotation Library) is a software subsystem for UNIX-like operating systems providing hardware abstraction. HAL is now deprecated on most Linux distributions and on FreeBSD. Functionality is being merged into udev on Linux as of 2008–2010 and devd on FreeBSD.
The Windows NT hardware abstraction layer (HAL) is a layer between the physical hardware of the computer and the rest of the operating system. It was designed to hide differences in hardware and provide a consistent platform on which the kernel is run.
Strictly speaking, an operating system (and thus, a kernel) is not required to run a computer. Programs can be directly loaded and executed on the "bare metal" machine, provided that the authors of those programs are willing to work without any hardware abstraction or operating system support. Most early computers operated this way during the ...
Firmware may include only low-level software, but can also include all software, including an operating system and applications. The software layers can be further divided into hardware abstraction layers, physical and logical device drivers, repositories such as filesystems, operating system kernels, middleware, applications, and others.
For a more complex device, firmware may provide relatively low-level control as well as hardware abstraction services to higher-level software such as an operating system. Firmware is found in a wide range of computing devices including personal computers , smartphones , home appliances , vehicles , computer peripherals and in many of the ...
Adeos (Adaptive Domain Environment for Operating Systems) is a nanokernel hardware abstraction layer , or hypervisor, that operates between computer hardware and the operating system (OS) that runs on it. [1] [2] It is distinct from other nanokernels in that it is not only a low level layer for an outer kernel.