thermosphere: fix ptimer time freezing (again)

thermosphere/src/guest_timers.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "exceptions.h"
+#include "sysreg.h"
+
+static inline u64 computeCntvct(const ExceptionStackFrame *frame)
+{
+    return frame->cntpct_el0 - currentCoreCtx->totalTimeInHypervisor;
+}
+
+static inline void writeEmulatedPhysicalCompareValue(ExceptionStackFrame *frame, u64 val)
+{
+    // We lied about the value of cntpct, so we need to compute the time delta
+    // the guest actually intended to use...
+    u64 vct = computeCntvct(frame);
+    currentCoreCtx->emulPtimerCval = val;
+    SET_SYSREG(cntp_cval_el0, frame->cntpct_el0 + (val - vct));
+}