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