2 * This file is part of the libpayload project.
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <libpayload.h>
33 * This structure seeds the stack. We provide the return address of our main
34 * function, and further down, the address of the function that we call when
35 * we leave and try to restore the original stack. At the very bottom of the
36 * stack we store the orignal stack pointer from the calling application.
39 static void start_main(void);
40 extern void _leave(void);
46 } initial_stack __attribute__ ((section(".istack"))) = {
47 { (uint32_t) start_main, 0 },
48 { (uint32_t) _leave, 0 },
49 (uint32_t) & initial_stack,
52 void *_istack = &initial_stack;
55 * This is our C entry function - set up the system
56 * and jump into the payload entry point.
58 static void start_main(void)
60 extern int main(void);
62 /* Set up the consoles. */
65 /* Gather system information. */
69 * Any other system init that has to happen before the
70 * user gets control goes here.
73 /* Go to the entry point. */
75 /* In the future we may care about the return value. */
79 * Returning here will go to the _leave function to return
80 * us to the original context.