From c2ceaa887e07a219b16423d8f9c20624785ee4a1 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Tue, 14 Nov 2006 01:29:11 -0500
Subject: [PATCH] Make sure a POR doesn't clobber the value of the hpstate.

--HG--
extra : convert_revision : 4504f08fd94792819bd4419bbd2e0ebd1d7f29e9
---
 src/arch/sparc/faults.cc | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/arch/sparc/faults.cc b/src/arch/sparc/faults.cc
index 4cf411d3b..3ec41ba61 100644
--- a/src/arch/sparc/faults.cc
+++ b/src/arch/sparc/faults.cc
@@ -593,7 +593,16 @@ void PowerOnReset::invoke(ThreadContext * tc)
     tc->setMiscReg(MISCREG_PSTATE, 1 << 4);
 
     //Turn on red and hpriv, set everything else to 0
-    tc->setMiscReg(MISCREG_HPSTATE, (1 << 5) | (1 << 2));
+    MiscReg HPSTATE = tc->readMiscReg(MISCREG_HPSTATE);
+    //HPSTATE.red = 1
+    HPSTATE |= (1 << 5);
+    //HPSTATE.hpriv = 1
+    HPSTATE |= (1 << 2);
+    //HPSTATE.ibe = 0
+    HPSTATE &= ~(1 << 10);
+    //HPSTATE.tlz = 0
+    HPSTATE &= ~(1 << 0);
+    tc->setMiscReg(MISCREG_HPSTATE, HPSTATE);
 
     //The tick register is unreadable by nonprivileged software
     tc->setMiscReg(MISCREG_TICK, 1ULL << 63);