Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / sparc / kernel / dtlb_prot.S

diff --git a/kernel/arch/sparc/kernel/dtlb_prot.S b/kernel/arch/sparc/kernel/dtlb_prot.S
new file mode 100644 (file)
index 0000000..d668ca1
--- /dev/null
+++ b/kernel/arch/sparc/kernel/dtlb_prot.S
@@ -0,0 +1,54 @@
+/*
+ * dtlb_prot.S: DTLB protection trap strategy.
+ *              This is included directly into the trap table.
+ *
+ * Copyright (C) 1996,1998 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1997,1998 Jakub Jelinek   (jj@ultra.linux.cz)
+ */
+
+/* Ways we can get here:
+ *
+ * [TL == 0] 1) User stores to readonly pages.
+ * [TL == 0] 2) Nucleus stores to user readonly pages.
+ * [TL >  0] 3) Nucleus stores to user readonly stack frame.
+ */
+
+/* PROT ** ICACHE line 1: User DTLB protection trap    */
+       mov             TLB_SFSR, %g1
+       stxa            %g0, [%g1] ASI_DMMU             ! Clear FaultValid bit
+       membar          #Sync                           ! Synchronize stores
+       rdpr            %pstate, %g5                    ! Move into alt-globals
+       wrpr            %g5, PSTATE_AG|PSTATE_MG, %pstate
+       rdpr            %tl, %g1                        ! Need a winfixup?
+       cmp             %g1, 1                          ! Trap level >1?
+       mov             TLB_TAG_ACCESS, %g4             ! For reload of vaddr
+
+/* PROT ** ICACHE line 2: More real fault processing */
+       ldxa            [%g4] ASI_DMMU, %g5             ! Put tagaccess in %g5
+       bgu,pn          %xcc, winfix_trampoline         ! Yes, perform winfixup
+        mov            FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
+       ba,pt           %xcc, sparc64_realfault_common  ! Nope, normal fault
+        nop
+       nop
+       nop
+       nop
+
+/* PROT ** ICACHE line 3: Unused...    */
+       nop
+       nop
+       nop
+       nop
+       nop
+       nop
+       nop
+       nop
+
+/* PROT ** ICACHE line 4: Unused...    */
+       nop
+       nop
+       nop
+       nop
+       nop
+       nop
+       nop
+       nop