/****************************************************************************
* arch/arm/src/armv7-a/arm_fpuconfig.S
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include "cp15.h"
.file "arm_fpuconfig.S"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Symbols
****************************************************************************/
.globl arm_fpuconfig
/****************************************************************************
* Assembly Macros
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
.text
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sam_fpuconfig
*
* Description:
* Configure the FPU. Enables access to CP10 and CP11
*
****************************************************************************/
.globl arm_fpuconfig
.type arm_fpuconfig, %function
arm_fpuconfig:
/* Enable access to CP10 and CP11 in CP15.CACR */
mrc CP15_CPACR(r0)
orr r0, r0, #0xf00000
mcr CP15_CPACR(r0)
/* Enable access to CP10 and CP11 in CP15.NSACR */
/* REVISIT: Do we need to do this? */
/* Set FPEXC.EN (B30) */
fmrx r0, fpexc
orr r0, r0, #0x40000000
fmxr fpexc, r0
bx lr
.size arm_fpuconfig, . - arm_fpuconfig
.end