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authorAkira Takeuchi <takeuchi.akr@jp.panasonic.com>2010-10-27 17:28:48 +0100
committerDavid Howells <dhowells@redhat.com>2010-10-27 17:28:48 +0100
commit8f19e3daf3fffee9e18a8812067a6a4b538ae6c8 (patch)
tree854a50f4fae7f35688171cb20874cfddabda99a4 /arch/mn10300/kernel/entry.S
parent633171861a3120af011bb1ee8dd40069951dfeac (diff)
MN10300: AM34 erratum requires MMUCTR read and write on exception entry
An AM34 erratum requires MMUCTR read and write on entry to certain exceptions, prior to EPSW.NMID being cleared to allow NMIs to happen. Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com> Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'arch/mn10300/kernel/entry.S')
-rw-r--r--arch/mn10300/kernel/entry.S8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index b82ce7b47fcb..355f68176771 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -251,6 +251,10 @@ double_fault_loop:
ENTRY(raw_bus_error)
add -4,sp
mov d0,(sp)
+#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
+ mov (MMUCTR),d0
+ mov d0,(MMUCTR)
+#endif
mov (BCBERR),d0 # what
btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error
beq __common_exception_aux # it wasn't
@@ -282,6 +286,10 @@ ENTRY(nmi_handler)
ENTRY(__common_exception)
add -4,sp
mov d0,(sp)
+#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
+ mov (MMUCTR),d0
+ mov d0,(MMUCTR)
+#endif
__common_exception_aux:
mov (TBR),d0