53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/*
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* File : vfp.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Develop Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2014-11-07 weety first version
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include "vfp.h"
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#ifdef RT_USING_VFP
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void vfp_init(void)
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{
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int ret = 0;
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unsigned int value;
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asm volatile ("mrc p15, 0, %0, c1, c0, 2"
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:"=r"(value)
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:);
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value |= 0xf00000;/*enable CP10, CP11 user access*/
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asm volatile("mcr p15, 0, %0, c1, c0, 2"
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:
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:"r"(value));
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asm volatile("fmrx %0, fpexc"
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:"=r"(value));
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value |=(1<<30);
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asm volatile("fmxr fpexc, %0"
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:
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:"r"(value));
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}
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#endif
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