[SPARC64]: Sanitize %pstate writes for sun4v.
If we're just switching between different alternate global
sets, nop it out on sun4v. Also, get rid of all of the
alternate global save/restore in the OBP CIF trampoline code.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/ktlb.S b/arch/sparc64/kernel/ktlb.S
index 9b415ab..c133543 100644
--- a/arch/sparc64/kernel/ktlb.S
+++ b/arch/sparc64/kernel/ktlb.S
@@ -60,8 +60,15 @@
retry
kvmap_itlb_longpath:
- rdpr %pstate, %g5
+
+661: rdpr %pstate, %g5
wrpr %g5, PSTATE_AG | PSTATE_MG, %pstate
+ .section .gl_2insn_patch, "ax"
+ .word 661b
+ nop
+ nop
+ .previous
+
rdpr %tpc, %g5
ba,pt %xcc, sparc64_realfault_common
mov FAULT_CODE_ITLB, %g4
@@ -161,8 +168,15 @@
nop
kvmap_dtlb_longpath:
- rdpr %pstate, %g5
+
+661: rdpr %pstate, %g5
wrpr %g5, PSTATE_AG | PSTATE_MG, %pstate
+ .section .gl_2insn_patch, "ax"
+ .word 661b
+ nop
+ nop
+ .previous
+
rdpr %tl, %g4
cmp %g4, 1
mov TLB_TAG_ACCESS, %g4
