On 05/15/14 06:45, Nathan Whitehorn wrote:
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
Sorry, I can't do math. Please ignore this email.
-Nathan
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