]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[POWERPC] 8xx: Work around CPU15 erratum.
authorScott Wood <scottwood@freescale.com>
Mon, 25 Jun 2007 19:50:41 +0000 (14:50 -0500)
committerKumar Gala <galak@kernel.crashing.org>
Thu, 4 Oct 2007 01:36:36 +0000 (20:36 -0500)
commit7401685242fbcbf4b0660726372c77a88c4af17d
tree71b814468d705c2c48184161c38a0295c832239d
parent663edbd2640447dc43840568cd5701e6c9878d63
[POWERPC] 8xx: Work around CPU15 erratum.

The CPU15 erratum on MPC8xx chips can cause incorrect code execution
under certain circumstances, where there is a conditional or indirect
branch in the last word of a page, with a target in the last cache line
of the next page.  This patch implements one of the suggested
workarounds, by forcing a TLB miss whenever execution crosses a page
boundary.  This is done by invalidating the pages before and after the
one being loaded into the TLB in the ITLB miss handler.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
arch/powerpc/kernel/head_8xx.S
arch/powerpc/platforms/8xx/Kconfig