patch-2.4.12 linux/arch/sparc64/kernel/dtlb_base.S
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- Lines: 58
- Date:
Wed Oct 10 23:42:46 2001
- Orig file:
v2.4.11/linux/arch/sparc64/kernel/dtlb_base.S
- Orig date:
Sun Sep 23 11:40:56 2001
diff -u --recursive --new-file v2.4.11/linux/arch/sparc64/kernel/dtlb_base.S linux/arch/sparc64/kernel/dtlb_base.S
@@ -1,4 +1,4 @@
-/* $Id: dtlb_base.S,v 1.14 2001/09/11 02:20:23 kanoj Exp $
+/* $Id: dtlb_base.S,v 1.16 2001/10/09 04:02:11 davem Exp $
* dtlb_base.S: Front end to DTLB miss replacement strategy.
* This is included directly into the trap table.
*
@@ -65,27 +65,28 @@
/* DTLB ** ICACHE line 1: Quick user TLB misses */
ldxa [%g1 + %g1] ASI_DMMU, %g4 ! Get TAG_ACCESS
andcc %g4, TAG_CONTEXT_BITS, %g0 ! From Nucleus?
+ mov 1, %g5 ! For TL==3 test
from_tl1_trap:
CREATE_VPTE_OFFSET1(%g4, %g6) ! Create VPTE offset
be,pn %xcc, 3f ! Yep, special processing
CREATE_VPTE_OFFSET2(%g4, %g6) ! Create VPTE offset
+ cmp %g5, 3 ! Last trap level?
+ be,a,pn %xcc, 1f ! Yep, use non-faulting load
+ ldxa [%g3 + %g6] ASI_SNF, %g5 ! Load VPTE (no-VPTE-fault)
+
+/* DTLB ** ICACHE line 2: User finish + quick kernel TLB misses */
ldxa [%g3 + %g6] ASI_S, %g5 ! Load VPTE
-1: brlz,pt %g5, 9f ! Valid, load into TLB
+1: brgez,pn %g5, longpath ! Invalid, branch out
nop ! Delay-slot
- ba,a,pt %xcc, longpath ! Invalid, branch out
-
-/* DTLB ** ICACHE line 2: Quick kernel TLB misses */
-3: brlz,pt %g4, 9f ! Kernel virtual map?
- xor %g2, %g4, %g5 ! Finish bit twiddles
- ba,pt %xcc, kvmap ! Yep, go check for obp/vmalloc
- nop
- nop
9: stxa %g5, [%g0] ASI_DTLB_DATA_IN ! Reload TLB
retry ! Trap return
-longpath:
- rdpr %pstate, %g5 ! Move into alternate globals
+3: brlz,pt %g4, 9b ! Kernel virtual map?
+ xor %g2, %g4, %g5 ! Finish bit twiddles
+ ba,a,pt %xcc, kvmap ! Yep, go check for obp/vmalloc
/* DTLB ** ICACHE line 3: winfixups+real_faults */
+longpath:
+ rdpr %pstate, %g5 ! Move into alternate globals
wrpr %g5, PSTATE_AG|PSTATE_MG, %pstate
rdpr %tl, %g4 ! See where we came from.
cmp %g4, 1 ! Is etrap/rtrap window fault?
@@ -93,10 +94,9 @@
ldxa [%g4] ASI_DMMU, %g5 ! Load faulting VA page
be,pt %xcc, sparc64_realfault_common ! Jump to normal fault handling
mov FAULT_CODE_DTLB, %g4 ! It was read from DTLB
- ba,a,pt %xcc, winfix_trampoline ! Call window fixup code
/* DTLB ** ICACHE line 4: Unused... */
- nop
+ ba,a,pt %xcc, winfix_trampoline ! Call window fixup code
nop
nop
nop
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