Author: jhibbits
Date: Wed Apr 24 02:51:58 2019
New Revision: 346619
URL: https://svnweb.freebsd.org/changeset/base/346619
Log:
powerpc: Add a couple missing isyncs
mtmsr and mtsr require context synchronizing instructions to follow. Without
a CSI, there's a chance for a machine check exception. This reportedly does
occur on a MPC750 (PowerMac G3).
Reported by: Mark Millard
Modified:
head/sys/powerpc/aim/trap_subr32.S
Modified: head/sys/powerpc/aim/trap_subr32.S
==============================================================================
--- head/sys/powerpc/aim/trap_subr32.S Wed Apr 24 01:11:50 2019
(r346618)
+++ head/sys/powerpc/aim/trap_subr32.S Wed Apr 24 02:51:58 2019
(r346619)
@@ -68,7 +68,7 @@
lwzu sr,PM_SR(pmap); \
RESTORE_SRS(pmap,sr) \
/* Restore SR 12 */ \
- lwz sr,12*4(pmap); mtsr 12,sr
+ lwz sr,12*4(pmap); mtsr 12,sr; isync
/*
* Kernel SRs are loaded directly from kernel_pmap_
@@ -799,6 +799,7 @@ CNAME(trapexit):
mfmsr %r3
andi. %r3,%r3,~PSL_EE@l
mtmsr %r3
+ isync
/* Test AST pending: */
lwz %r5,FRAME_SRR1+8(%r1)
mtcr %r5
_______________________________________________
svn-src-head@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
