forked from xuos/xiuos
97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
//*****************************************************************************
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//
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// startup_gcc.c - Startup code for use with GNU tools.
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//
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// Copyright (c) 2013 Texas Instruments Incorporated. All rights reserved.
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// Software License Agreement
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// This is part of revision 10636 of the Stellaris Firmware Development Package.
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//
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//*****************************************************************************
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/**
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* @file boot.c
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* @brief derived from Stellaris Firmware Development Package
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* @version 1.0
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* @author AIIT XUOS Lab
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* @date 2021-05-13
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*/
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/*************************************************
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File name: boot.c
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Description: Reset and init function
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Others:
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History:
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1. Date: 2021-05-13
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Author: AIIT XUOS Lab
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Modification:
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1. take startup_gcc.c from revision 10636 of the Stellaris Firmware Development Package for XiZi kernel
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*************************************************/
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extern unsigned long _sidata;
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extern unsigned long _sdata;
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extern unsigned long _edata;
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extern unsigned long _sbss;
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extern unsigned long _ebss;
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extern int entry(void);
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void
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Reset_Handler(void)
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{
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unsigned long *pulSrc, *pulDest;
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//
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// Copy the data segment initializers from flash to SRAM.
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//
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pulSrc = &_sidata;
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for(pulDest = &_sdata; pulDest < &_edata; )
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{
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*pulDest++ = *pulSrc++;
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}
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//
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// Zero fill the bss segment.
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//
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__asm(" ldr r0, =_sbss\n"
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" ldr r1, =_ebss\n"
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" mov r2, #0\n"
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" .thumb_func\n"
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"zero_loop:\n"
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" cmp r0, r1\n"
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" it lt\n"
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" strlt r2, [r0], #4\n"
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" blt zero_loop");
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//
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// Call the application's entry point.
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//
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entry();
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} |