39 lines
743 B
C
39 lines
743 B
C
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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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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