Re: union/struct representations for MAS Registers

On Aug 10, 2011, at 12:25 PM, David Laight wrote:

quoted

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.

I'm ok with the masking stuff.
However, I'm actually surprised this is true given the maturity of our ABIs.

-JX

Their use to map anything physical is doomed to portabilily issues.

	David