diff options
| author | Akira Takeuchi <takeuchi.akr@jp.panasonic.com> | 2010-10-27 18:28:48 +0200 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2010-10-27 18:28:48 +0200 |
| commit | 8f19e3daf3fffee9e18a8812067a6a4b538ae6c8 (patch) | |
| tree | 854a50f4fae7f35688171cb20874cfddabda99a4 /arch/mn10300/mm | |
| parent | MN10300: Make the boot wrapper able to use writeback caching (diff) | |
| download | linux-8f19e3daf3fffee9e18a8812067a6a4b538ae6c8.tar.xz linux-8f19e3daf3fffee9e18a8812067a6a4b538ae6c8.zip | |
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/mm')
| -rw-r--r-- | arch/mn10300/mm/tlb-mn10300.S | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/arch/mn10300/mm/tlb-mn10300.S b/arch/mn10300/mm/tlb-mn10300.S index 7095147dcb8b..ccf622999a5b 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 |