Re-sync with upstream and stripping away none kernel related.

portable/ThirdParty/XCC/Xtensa/xtensa_init.c

@@ -0,0 +1,66 @@
+
+/*
+ * Copyright (c) 2015-2019 Cadence Design Systems, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * XTENSA INITIALIZATION ROUTINES CODED IN C
+ *
+ * This file contains miscellaneous Xtensa RTOS-generic initialization functions
+ * that are implemented in C.
+ */
+
+
+#ifdef XT_BOARD
+#include    <xtensa/xtbsp.h>
+#endif
+
+#include    "xtensa_rtos.h"
+
+#ifdef XT_RTOS_TIMER_INT
+
+unsigned _xt_tick_divisor = 0;  /* cached number of cycles per tick */
+
+/*
+Compute and initialize at run-time the tick divisor (the number of 
+processor clock cycles in an RTOS tick, used to set the tick timer).
+Called when the processor clock frequency is not known at compile-time.
+*/
+void _xt_tick_divisor_init(void)
+{
+#ifdef XT_CLOCK_FREQ
+
+    _xt_tick_divisor = (XT_CLOCK_FREQ / XT_TICK_PER_SEC);
+
+#else
+
+    #ifdef XT_BOARD
+    _xt_tick_divisor = xtbsp_clock_freq_hz() / XT_TICK_PER_SEC;
+    #else
+    #error "No way to obtain processor clock frequency"
+    #endif  /* XT_BOARD */
+
+#endif /* XT_CLOCK_FREQ */
+}
+
+#endif /* XT_RTOS_TIMER_INT */
+