[PATCH] eng: Add register block specification types

[Sebastian Huber]

On 11/09/2021 19:59, Joel Sherrill wrote:
> 
> 
> On Fri, Sep 10, 2021, 9:41 AM Sebastian Huber 
> <sebastian.huber at embedded-brains.de 
> <mailto:sebastian.huber at embedded-brains.de>> wrote:
> 
>     A register block may be used to specify the memory-mapped interface to
>     the hardware.  Register blocks consist of register block members.
>     Register block members are either instances of registers or instances of
>     other register blocks.  Registers consists of bit fields.
> 
> 
> I hope you don't mean C bit fields. They are quite non-portable.

This register block specification is independent of an interface in a 
particular programming language.  It is similar to a machine readable 
manual. From the register block specification you could generate code 
for C, C++, Rust, Ada, Python, and so on. Currently, there is only a C 
header file generator (which doesn't use C bit fields), for example:

https://git.rtems.org/sebh/rtems.git/tree/bsps/include/grlib/gptimer-regs.h?h=qual-35

> 
> And I hope we are avoiding packed in this definition of requirements set.

What do you mean with "packed"?


> Unfortunately it seems there are more things you can get wrong here 
> which leads to negative requirements and negative requirements are bad

Sorry, what do you mean with "negative requirements" here?

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