svn commit: r266116 - head/sys/powerpc/aim
Nathan Whitehorn
nwhitehorn at freebsd.org
Thu May 15 13:45:26 UTC 2014
On 05/14/14 21:18, Justin Hibbits wrote:
> Author: jhibbits
> Date: Thu May 15 04:18:06 2014
> New Revision: 266116
> URL: http://svnweb.freebsd.org/changeset/base/266116
>
> Log:
> A page mask size is 12-bits, not 11.
>
> MFC after: 1 week
>
> Modified:
> head/sys/powerpc/aim/trap_subr32.S
>
> Modified: head/sys/powerpc/aim/trap_subr32.S
> ==============================================================================
> --- head/sys/powerpc/aim/trap_subr32.S Thu May 15 03:47:52 2014 (r266115)
> +++ head/sys/powerpc/aim/trap_subr32.S Thu May 15 04:18:06 2014 (r266116)
> @@ -677,7 +677,7 @@ disitrap:
> mtcr %r31
> bt 17,realtrap /* branch is user mode */
> mfsprg1 %r31 /* get old SP */
> - clrrwi %r31,%r31,11 /* Round SP down to nearest page */
> + clrrwi %r31,%r31,12 /* Round SP down to nearest page */
> sub. %r30,%r31,%r30 /* SP - DAR */
> bge 1f
> neg %r30,%r30 /* modulo value */
>
Is it? 4096 bytes is 2^12. The mask is 4096-1, which is 11 bits all 1.
-Nathan
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