From: Sam Ravnborg <sam@xxxxxxxxxxxx>
Date: Tue, 22 May 2012 22:10:40 +0200
> Use PSR to check if the PCU is LEON and jump to
^^^
"CPU" :-)
> + /* Check if this is a LEON CPU */
> + rd %psr, %g3
> + set PSR_IMPL, %g2
> + and %g2, %g3, %g3
> + srl %g3, PSR_IMPL_SHIFT, %g3
> + cmp %g3, PSR_IMPL_LEON
I would code this like:
rd %psr, %g3
srl %g3, PSR_IMPL_SHIFT, %g3
and %g3, 0xf /* PST_IMPL_WHATEVER_MASK */, %g3
cmp %g3, PSR_IMPL_LEON
> + /* Check for a viking (TI) module. */
> + cmp %g3, PSR_IMPL_TEXAS
> + bne srmmu_not_viking
> nop
PSR_IMPL_TI is probably a better name fo this macro.
> @@ -313,6 +326,29 @@ srmmu_nviking:
> nop ! wheee....
>
>
> +leon_remap:
> + /* Sanity-check, is MMU enabled */
> + lda [%g0] ASI_LEON_MMUREGS, %g1
> + andcc %g1, 1, %g0
> + be halt_sun4_or_sun4c
> + nop
Checking that the MMU is disabled is correct, but branching
to the sun4c-not-supported error message is probably not. :-)
Otherwise looks OK.
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