union/struct representations for MAS Registers

[David Laight]

> I have some and use them in some code, they represent ISA 
> 2.06 MAVN=1 (version 2)
> Can I keep them?
> if so, should I put them somewhere useful to others?
> 
> Examples:
> union mas1 {
> 	u32 _val;
> 	struct {
> 		u32 v:1;
> 		u32 iprot:1;
> 		u32 tid:14;
> 		u32 _reserved_1:2;
> 		u32 ind:1;
> 		u32 ts:1;
> 		u32 tsize:4;
> 		u32 _reserved_2:8;
> 	};
> };

Bitfields are rather non-portable, the compiler has a lot of choice
about how to align the bits in memory.
Their use to map anything physical is doomed to portabilily issues.

	David