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-rw-r--r--arch/mn10300/Kconfig3
-rw-r--r--arch/mn10300/kernel/entry.S8
-rw-r--r--arch/mn10300/mm/tlb-mn10300.S32
3 files changed, 37 insertions, 6 deletions
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 21e2a53..dd7b570 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -20,6 +20,9 @@ config AM34_2
select MN10300_HAS_ATOMIC_OPS_UNIT
select MN10300_HAS_CACHE_SNOOP
+config ERRATUM_NEED_TO_RELOAD_MMUCTR
+ def_bool y if AM33_3 || AM34_2
+
config MMU
def_bool y
diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index b82ce7b..355f681 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
diff --git a/arch/mn10300/mm/tlb-mn10300.S b/arch/mn10300/mm/tlb-mn10300.S
index 7095147..ccf6229 100644
--- a/arch/mn10300/mm/tlb-mn10300.S
+++ b/arch/mn10300/mm/tlb-mn10300.S
@@ -27,7 +27,6 @@
###############################################################################
.type itlb_miss,@function
ENTRY(itlb_miss)
- and ~EPSW_NMID,epsw
#ifdef CONFIG_GDBSTUB
movm [d2,d3,a2],(sp)
#else
@@ -38,6 +37,12 @@ ENTRY(itlb_miss)
nop
#endif
+#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
+ mov (MMUCTR),d2
+ mov d2,(MMUCTR)
+#endif
+
+ and ~EPSW_NMID,epsw
mov (IPTEU),d3
mov (PTBR),a2
mov d3,d2
@@ -79,7 +84,6 @@ itlb_miss_fault:
###############################################################################
.type dtlb_miss,@function
ENTRY(dtlb_miss)
- and ~EPSW_NMID,epsw
#ifdef CONFIG_GDBSTUB
movm [d2,d3,a2],(sp)
#else
@@ -90,6 +94,12 @@ ENTRY(dtlb_miss)
nop
#endif
+#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
+ mov (MMUCTR),d2
+ mov d2,(MMUCTR)
+#endif
+
+ and ~EPSW_NMID,epsw
mov (DPTEU),d3
mov (PTBR),a2
mov d3,d2
@@ -130,9 +140,15 @@ dtlb_miss_fault:
###############################################################################
.type itlb_aerror,@function
ENTRY(itlb_aerror)
- and ~EPSW_NMID,epsw
add -4,sp
SAVE_ALL
+
+#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
+ mov (MMUCTR),d1
+ mov d1,(MMUCTR)
+#endif
+
+ and ~EPSW_NMID,epsw
add -4,sp # need to pass three params
# calculate the fault code
@@ -148,7 +164,6 @@ ENTRY(itlb_aerror)
clr d0
mov d0,(IPTEL)
- and ~EPSW_NMID,epsw
or EPSW_IE,epsw
mov fp,d0
call do_page_fault[],0 # do_page_fault(regs,code,addr
@@ -163,10 +178,16 @@ ENTRY(itlb_aerror)
###############################################################################
.type dtlb_aerror,@function
ENTRY(dtlb_aerror)
- and ~EPSW_NMID,epsw
add -4,sp
SAVE_ALL
+
+#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
+ mov (MMUCTR),d1
+ mov d1,(MMUCTR)
+#endif
+
add -4,sp # need to pass three params
+ and ~EPSW_NMID,epsw
# calculate the fault code
movhu (MMUFCR_DFC),d1
@@ -180,7 +201,6 @@ ENTRY(dtlb_aerror)
clr d0
mov d0,(DPTEL)
- and ~EPSW_NMID,epsw
or EPSW_IE,epsw
mov fp,d0
call do_page_fault[],0 # do_page_fault(regs,code,addr
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