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MN10300: AM34 erratum requires MMUCTR read and write on exception entry

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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>
This commit is contained in:
Akira Takeuchi 2010-10-27 17:28:48 +01:00 committed by David Howells
parent 633171861a
commit 8f19e3daf3
3 changed files with 37 additions and 6 deletions
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3
arch/mn10300/Kconfig
View File

@ -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

8
arch/mn10300/kernel/entry.S
View File

@ -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

32
arch/mn10300/mm/tlb-mn10300.S
View File

@ -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