crashtest-r0ket/lpc1xxx/LPC1xxx_startup.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);
}