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