39 lines
743 B
C
39 lines
743 B
C
|
/*
|
||
|
|
* Copyright (c) 2006-2018, RT-Thread Development Team
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: Apache-2.0
|
||
|
|
*
|
||
|
|
* 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
|