Re: [PATCH v4 2/5] arm: add new asm macro update_sctlr

[Leif Lindholm]

On Mon, Feb 03, 2014 at 04:00:51PM +0000, Will Deacon wrote:
> > > > With the two call sites in uefi_phys.S as:
> > > > 
> > > > 	ldr	r5, =(CR_M)
> > > > 	update_sctlr	r12, , r5
> > > > and
> > > > 	ldr	r4, =(CR_I | CR_C | CR_M)
> > > > 	update_sctlr	r12, r4
> > > 
> > > These ldr= could be movs, right?
> > 
> > The first one could.
> > The second one could be movw on armv7+.
> > 
> > > If so, I definitely prefer this to putting an ldr = into the macro itself
> > > (option 2).
> > 
> > And your preference between 1) and 2) is?
> 
> (1), using bic and mov[tw] where possible.

(1): ok, thanks.

bic: sure, that was an oversight.

mov[tw]: why?
Then we end up battling different available immediate fields in A32/T32
instruction sets and v5/v6/v7 architecture versions.

/
    Leif
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/