thermosphere: add hypervisor timer code

thermosphere/src/timer.c

@@ -0,0 +1,38 @@
+/*
+ * 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/>.
+ */
+
+#include "timer.h"
+#include "irq.h"
+
+u64 g_timerFreq = 0;
+
+void timerInit(void)
+{
+    timerSetInterruptStatus(false, false);
+    if (currentCoreCtx->isBootCore) {
+        g_timerFreq = GET_SYSREG(cntfrq_el0);
+    }
+}
+
+void timerInterruptHandler(void)
+{
+    // Disable timer interrupts until reprogrammed
+    timerSetInterruptStatus(false, false);
+
+    // For fun
+    DEBUG("EL2 [core %d]: Timer interrupt at %lums\n", (int)currentCoreCtx->coreId, timerGetSystemTimeMs());
+    timerSetTimeoutMs(1000);
+}