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Diffstat (limited to 'qemu/roms/SLOF/clients/net-snk/kernel/timer.c')
-rw-r--r--qemu/roms/SLOF/clients/net-snk/kernel/timer.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/qemu/roms/SLOF/clients/net-snk/kernel/timer.c b/qemu/roms/SLOF/clients/net-snk/kernel/timer.c
new file mode 100644
index 000000000..2d8705895
--- /dev/null
+++ b/qemu/roms/SLOF/clients/net-snk/kernel/timer.c
@@ -0,0 +1,39 @@
+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ * IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#include <stdint.h>
+#include "kernel.h"
+
+//*******************************************************************
+// variable "tb_freq" contains the frequency in Hz
+// and is read from the device tree (setup by LLFW) in "init.c"
+uint64_t tb_freq;
+
+//-------------------------------------------------------------------
+// Read the current timebase
+uint64_t get_time(void)
+{
+ uint64_t act;
+
+ __asm__ __volatile__(
+ "0: mftbu %0 ;\
+ mftbl %%r0 ; \
+ mftbu %%r4 ; \
+ cmpw %0,%%r4 ; \
+ bne 0b; \
+ sldi %0,%0,32; \
+ or %0,%0,%%r0"
+ : "=r"(act)
+ : /* no inputs */
+ : "r0", "r4");
+ return act;
+}