1 /*
2 * Copyright (c) 2012 Travis Geiselbrecht
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23 #include <debug.h>
24 #include <compiler.h>
25 #include <stdint.h>
26
27 /* externals */
28 extern unsigned int __data_start_rom, __data_start, __data_end;
29 extern unsigned int __bss_start, __bss_end;
30
31 extern void lk_main(void) __NO_RETURN __EXTERNALLY_VISIBLE;
32
_start(void)33 void _start(void)
34 {
35 /* copy data from rom */
36 if (&__data_start != &__data_start_rom) {
37 unsigned int *src = &__data_start_rom;
38 unsigned int *dest = &__data_start;
39
40 while (dest != &__data_end)
41 *dest++ = *src++;
42 }
43
44 /* zero out bss */
45 unsigned int *bss = &__bss_start;
46 while (bss != &__bss_end)
47 *bss++ = 0;
48
49 lk_main();
50 }
51