Author: raj
Date: Fri Apr 24 08:57:54 2009
New Revision: 191455
URL: http://svn.freebsd.org/changeset/base/191455
Log:
Zero PCB during early AIM PowerPC init.
When memory is not zero'ed by firmware, uninitialized PCB can have bogus
contents, which appear as a saved onfault condition, Altivec context to
restore etc. and lead to corruption/crashes. This commit fixes such issues.
Submitted by: Michal Mazur arg ! semihalf dot com
Tested by: Andreas Tobler andreast-list ! fgznet dot ch
Modified:
head/sys/powerpc/aim/machdep.c
Modified: head/sys/powerpc/aim/machdep.c
==============================================================================
--- head/sys/powerpc/aim/machdep.c Fri Apr 24 06:44:58 2009
(r191454)
+++ head/sys/powerpc/aim/machdep.c Fri Apr 24 08:57:54 2009
(r191455)
@@ -505,6 +505,7 @@ powerpc_init(u_int startkernel, u_int en
thread0.td_pcb = (struct pcb *)
((thread0.td_kstack + thread0.td_kstack_pages * PAGE_SIZE -
sizeof(struct pcb)) & ~15);
+ bzero((void *)thread0.td_pcb, sizeof(struct pcb));
pc->pc_curpcb = thread0.td_pcb;
/* Initialise the message buffer. */
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