text: /*
   * This file is part of the µOS++ distribution.
   *   (https://github.com/micro-os-plus)
   * Copyright (c) 2014 Liviu Ionescu.
   *
   * Permission is hereby granted, free of charge, to any person
   * obtaining a copy of this software and associated documentation
   * files (the "Software"), to deal in the Software without
   * restriction, including without limitation the rights to use,
   * copy, modify, merge, publish, distribute, sublicense, and/or
   * sell copies of the Software, and to permit persons to whom
   * the Software is furnished to do so, subject to the following
   * conditions:
   *
   * The above copyright notice and this permission notice shall be
   * included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
   * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
   * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
   * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   * OTHER DEALINGS IN THE SOFTWARE.
   */
  
  // ----------------------------------------------------------------------------
  
  #include "cmsis_device.h"
  
  
  // ----------------------------------------------------------------------------
  
  extern unsigned int __vectors_start;
  
  // Forward declarations.
  
  void
  __initialize_hardware_early(void);
  
  void
  __initialize_hardware(void);
  
  // ----------------------------------------------------------------------------
  
  // This is the early hardware initialisation routine, it can be
  // redefined in the application for more complex cases that
  // require early inits (before BSS init).
  //
  // Called early from _start(), right before data & bss init.
  //
  // After Reset the Cortex-M processor is in Thread mode,
  // priority is Privileged, and the Stack is set to Main.
  
  void
  __attribute__((weak))
  __initialize_hardware_early(void)
  {
    // Call the CSMSIS system initialisation routine.
    SystemInit();
  
  #if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
    // Set VTOR to the actual address, provided by the linker script.
    // Override the manual, possibly wrong, SystemInit() setting.
    SCB->VTOR = (uint32_t)(&__vectors_start);
  #endif
  
    // The current version of SystemInit() leaves the value of the clock
    // in a RAM variable (SystemCoreClock), which will be cleared shortly,
    // so it needs to be recomputed after the RAM initialisations
    // are completed.
  
  #if defined(OS_INCLUDE_STARTUP_INIT_FP) || (defined (__VFP_FP__) && !defined (__SOFTFP__))
  
    // Normally FP init is done by SystemInit(). In case this is not done
    // there, it is possible to force its inclusion by defining
    // OS_INCLUDE_STARTUP_INIT_FP.
  
    // Enable the Cortex-M4 FPU only when -mfloat-abi=hard.
    // Code taken from Section 7.1, Cortex-M4 TRM (DDI0439C)
  
    // Set bits 20-23 to enable CP10 and CP11 coprocessor
    SCB->CPACR |= (0xF << 20);
  
  #endif // (__VFP_FP__) && !(__SOFTFP__)
  
  #if defined(OS_DEBUG_SEMIHOSTING_FAULTS)
    SCB->SHCSR |= SCB_SHCSR_USGFAULTENA_Msk;
  #endif
  }
  
  // This is the second hardware initialisation routine, it can be
  // redefined in the application for more complex cases that
  // require custom inits (before constructors), otherwise these can
  // be done in main().
  //
  // Called from _start(), right after data & bss init, before
  // constructors.
  
  void
  __attribute__((weak))
  __initialize_hardware(void)
  {
    // Call the CSMSIS system clock routine to store the clock frequency
    // in the SystemCoreClock global RAM location.
    SystemCoreClockUpdate();
  }
  
  // ----------------------------------------------------------------------------
  