88 lines
2.8 KiB
ArmAsm
88 lines
2.8 KiB
ArmAsm
/****************************************************************************
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* arch/arm/src/armv7-a/arm_fpuconfig.S
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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/****************************************************************************
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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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.file "arm_fpuconfig.S"
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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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.syntax unified
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.arm
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arm_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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