66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/*
|
|
* Software License Agreement (BSD License)
|
|
*
|
|
* Copyright (c) 2010, Roel Verdult
|
|
* All rights reserved.
|
|
*
|
|
* 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 of the copyright holders 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 ''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 HOLDERS 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.
|
|
*
|
|
*/
|
|
|
|
// These are defined and created by the linker, locating them in memory
|
|
extern unsigned char _etext;
|
|
extern unsigned char _data;
|
|
extern unsigned char _edata;
|
|
extern unsigned char _bss;
|
|
extern unsigned char _ebss;
|
|
|
|
// Prototype the required startup functions
|
|
extern void main(void);
|
|
|
|
// The entry point of the application, prepare segments,
|
|
// initialize the cpu and execute main()
|
|
void boot_entry(void)
|
|
{
|
|
register unsigned char *src, *dst;
|
|
|
|
// Get physical data address and copy it to sram
|
|
src = &_etext;
|
|
dst = &_data;
|
|
while(dst < &_edata) {
|
|
*dst++ = *src++;
|
|
}
|
|
|
|
// Clear the bss segment
|
|
dst = &_bss;
|
|
while(dst < &_ebss) {
|
|
*dst++ = 0;
|
|
}
|
|
|
|
// Execute the code at the program entry point
|
|
main();
|
|
|
|
// Do nothing when returned from main, just keep looping
|
|
while(1);
|
|
}
|