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/****************************************************************************
* arm/arm/src/armv7-m/up_ramvec_initialize.c
*
* 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 <nuttx/arch.h>
#include <nuttx/irq.h>
#include "nvic.h"
#include "ram_vectors.h"
#include "chip.h" /* May redefine VECTAB fields */
#include "up_arch.h"
#include "up_internal.h"
#ifdef CONFIG_ARCH_RAMVECTORS
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* Global Variables
****************************************************************************/
/* If CONFIG_ARCH_RAMVECTORS is defined, then the ARM logic must provide
* ARM-specific implementations of up_ramvec_initialize(), irq_attach(), and
* irq_dispatch. In this case, it is also assumed that the ARM vector
* table resides in RAM, has the name up_ram_vectors, and has been
* properly positioned and aligned in memory by the linker script.
*/
up_vector_t g_ram_vectors[ARMV7M_VECTAB_SIZE]
__attribute__((section(".ram_vectors")));
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_ramvec_initialize
*
* Description:
* Copy vectors to RAM an configure the NVIC to use the RAM vectors.
*
****************************************************************************/
void up_ramvec_initialize(void)
{
const up_vector_t *src;
up_vector_t *dest;
int i;
/* The vector table must be aligned */
DEBUGASSERT(((uint32_t)g_ram_vectors & ~NVIC_VECTAB_TBLOFF_MASK) == 0);
/* Copy the ROM vector table at address zero to RAM vector table.
*
* This must be done BEFORE the MPU is enable if the MPU is being used to
* protect against NULL pointer references.
*/
src = (const CODE up_vector_t *)0;
dest = g_ram_vectors;
for (i = 0; i < ARMV7M_VECTAB_SIZE; i++)
{
*dest++ = *src++;
}
/* Now configure the NVIC to use the new vector table. */
putreg32((uint32_t)g_ram_vectors, NVIC_VECTAB);
}
#endif /* !CONFIG_ARCH_RAMVECTORS */
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