| /** | |
| * \file | |
| * | |
| * \brief FPU support for SAM. | |
| * | |
| * Copyright (c) 2013 Atmel Corporation. All rights reserved. | |
| * | |
| * \asf_license_start | |
| * | |
| * \page License | |
| * | |
| * 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. The name of Atmel may not be used to endorse or promote products derived | |
| * from this software without specific prior written permission. | |
| * | |
| * 4. This software may only be redistributed and used in connection with an | |
| * Atmel microcontroller product. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED | |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE | |
| * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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. | |
| * | |
| * \asf_license_stop | |
| * | |
| */ | |
| #ifndef _FPU_H_INCLUDED_ | |
| #define _FPU_H_INCLUDED_ | |
| #include <compiler.h> | |
| /** Address for ARM CPACR */ | |
| #define ADDR_CPACR 0xE000ED88 | |
| /** CPACR Register */ | |
| #define REG_CPACR (*((volatile uint32_t *)ADDR_CPACR)) | |
| /** | |
| * Enable FPU | |
| */ | |
| __always_inline static void fpu_enable(void) | |
| { | |
| irqflags_t flags; | |
| flags = cpu_irq_save(); | |
| REG_CPACR |= (0xFu << 20); | |
| __DSB(); | |
| __ISB(); | |
| cpu_irq_restore(flags); | |
| } | |
| /** | |
| * Disable FPU | |
| */ | |
| __always_inline static void fpu_disable(void) | |
| { | |
| irqflags_t flags; | |
| flags = cpu_irq_save(); | |
| REG_CPACR &= ~(0xFu << 20); | |
| __DSB(); | |
| __ISB(); | |
| cpu_irq_restore(flags); | |
| } | |
| /** | |
| * Check if FPU is enabled | |
| */ | |
| __always_inline static bool fpu_is_enabled(void) | |
| { | |
| return (REG_CPACR & (0xFu << 20)); | |
| } | |
| #endif /* _FPU_H_INCLUDED_ */ |