text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  #include <assert.h>
  #include <stddef.h>
  #include <inttypes.h>
  #include <mcu/cortex_m7.h>
  
  /**
   * Boots the image described by the supplied image header.
   *
   * @param hdr                   The header for the image to boot.
   */
  void
  hal_system_start(void *img_start)
  {
      typedef void jump_fn(void);
  
      uint32_t base0entry;
      uint32_t jump_addr;
      jump_fn *fn;
  
      /* First word contains initial MSP value. */
      __set_MSP(*(uint32_t *)img_start);
  
      /* Second word contains address of entry point (Reset_Handler). */
      base0entry = *(uint32_t *)(img_start + 4);
      jump_addr = base0entry;
      fn = (jump_fn *)jump_addr;
  
      /* Remap memory such that flash gets mapped to the code region. */
      SYSCFG->MEMRMP = 0;
      SCB_InvalidateICache();
      __DSB();
  
      /* Jump to image. */
      fn();
  }
  
  