shared/start/bspidle.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*
0004  *  Moved to libbsp/powerpc/shared by Joel Sherrill (9 Sept 09).
0005  */
0006
0007 /*
0008  *  The MPC860 specific stuff was written by Jay Monkman (jmonkman@frasca.com)
0009  *
0010  *  Modified for the MPC8260ADS board by Andy Dachs <a.dachs@sstl.co.uk>
0011  *  Surrey Satellite Technology Limited, 2001
0012  *
0013  *  COPYRIGHT (c) 1989-2009.
0014  *  On-Line Applications Research Corporation (OAR).
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #include <bsp.h>
0039
0040 /**
0041  * @brief BSP Idle thread body.
0042  *
0043  *  The MSR[POW] bit is set to put the CPU into the low power mode
0044  *  defined in HID0.  HID0 is set during starup in start.S.
0045  */
0046 void *bsp_idle_thread( uintptr_t ignored )
0047 {
0048   for( ; ; ) {
0049     __asm__ volatile(
0050       "mfmsr 3; oris 3,3,4; sync; mtmsr 3; isync; ori 3,3,0; ori 3,3,0"
0051     );
0052   }
0053
0054   return 0; /* to remove warning */
0055 }