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SubjectRe: [PATCH v4 2/5] arm: add new asm macro update_sctlr
On Mon, Feb 03, 2014 at 04:46:36PM +0000, Leif Lindholm wrote:
> 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.

I was making the assumption that UEFI was going to be v7 only... is this not
true?

Will


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