66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
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/*
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* Software License Agreement (BSD License)
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*
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* Copyright (c) 2010, Roel Verdult
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* All rights reserved.
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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 are met:
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* 1. 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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* 2. 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 distribution.
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* 3. Neither the name of the copyright holders nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY 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 OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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// These are defined and created by the linker, locating them in memory
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extern unsigned char _etext;
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extern unsigned char _data;
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extern unsigned char _edata;
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extern unsigned char _bss;
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extern unsigned char _ebss;
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// Prototype the required startup functions
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extern void main(void);
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// The entry point of the application, prepare segments,
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// initialize the cpu and execute main()
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void boot_entry(void)
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{
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register unsigned char *src, *dst;
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// Get physical data address and copy it to sram
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src = &_etext;
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dst = &_data;
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while(dst < &_edata) {
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*dst++ = *src++;
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}
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// Clear the bss segment
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dst = &_bss;
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while(dst < &_ebss) {
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*dst++ = 0;
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}
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// Execute the code at the program entry point
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main();
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// Do nothing when returned from main, just keep looping
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while(1);
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}
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