[src/trunk]: src/sys/arch/arm/arm Add some dsb instructions to avoid Cortex A...

[skrll <skrll%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e1b5e67dfc39
branches:  trunk
changeset: 333347:e1b5e67dfc39
user:      skrll <skrll%NetBSD.org@localhost>
date:      Wed Oct 29 23:01:46 2014 +0000

description:
Add some dsb instructions to avoid Cortex A7 errata

diffstat:

 sys/arch/arm/arm/cpufunc_asm_armv7.S |  2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diffs (19 lines):

diff -r 849f7f7fab31 -r e1b5e67dfc39 sys/arch/arm/arm/cpufunc_asm_armv7.S
--- a/sys/arch/arm/arm/cpufunc_asm_armv7.S      Wed Oct 29 22:52:21 2014 +0000
+++ b/sys/arch/arm/arm/cpufunc_asm_armv7.S      Wed Oct 29 23:01:46 2014 +0000
@@ -377,6 +377,7 @@
        b       1b
 
 .Lnext_level_inv:
+       dsb
        mrc     p15, 1, r0, c0, c0, 1   @ read CLIDR
        ubfx    ip, r0, #24, #3         @ narrow to LoC
        add     r3, r3, #2              @ go to next level
@@ -437,6 +438,7 @@
        b       1b
 
 .Lnext_level_wbinv:
+       dsb
        mrc     p15, 1, r0, c0, c0, 1   @ read CLIDR
        ubfx    ip, r0, #24, #3         @ narrow to LoC
        add     r3, r3, #2              @ go to next level