66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
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/*******************************************************************************
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// Copyright (c) 2003-2015 Cadence Design Systems, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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--------------------------------------------------------------------------------
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XTENSA INITIALIZATION ROUTINES CODED IN C
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This file contains miscellaneous Xtensa RTOS-generic initialization functions
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that are implemented in C.
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*******************************************************************************/
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#ifdef XT_BOARD
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#include <xtensa/xtbsp.h>
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#endif
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#include "xtensa_rtos.h"
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#ifdef XT_RTOS_TIMER_INT
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unsigned _xt_tick_divisor = 0; /* cached number of cycles per tick */
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/*
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Compute and initialize at run-time the tick divisor (the number of
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processor clock cycles in an RTOS tick, used to set the tick timer).
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Called when the processor clock frequency is not known at compile-time.
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*/
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void _xt_tick_divisor_init(void)
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{
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#ifdef XT_CLOCK_FREQ
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_xt_tick_divisor = (XT_CLOCK_FREQ / XT_TICK_PER_SEC);
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#else
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#ifdef XT_BOARD
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_xt_tick_divisor = xtbsp_clock_freq_hz() / XT_TICK_PER_SEC;
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#else
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#error "No way to obtain processor clock frequency"
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#endif /* XT_BOARD */
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#endif /* XT_CLOCK_FREQ */
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}
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#endif /* XT_RTOS_TIMER_INT */
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