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I understand that it stands for Hardware Abstraction Layer but what exactly does it do ? Is it designed for high level languages like VB to communicate with the hardware ? What about the IN/OUT instructions do these instructions call into a HAL routine or do they communicate directly with the hardware’s device driver via the I/O manager ?
Thanks in advance
It’s essentially the “non-portable” part of the NT kernel, provided as a seperate module so that NT could be ported to multiple processor architectures. Example: interrupt routing.
No. It is meant as support routines for the NT kernel. If you are coding in user mode (as you would be as in high level languages like VB) you have no need to know it exists.
When you use the the
inandoutinstructions, this is talking directly to the CPU. This is entirely unrelated to the NT kernel topics you are discussing. There is no HAL there. There is no NT I/O manager. These instructions are what the x86 instruction set provides for talking to devices through an I/O address.