libpayload: The initial chunk of code writen by AMD

This is the initial chunk of code written by me and copyrighted
by AMD.  Includes everything but a few files that we pulled from
outside sources.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3170 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 79 insertions, 0 deletions

diff --git a/payloads/libpayload/i386/main.c b/payloads/libpayload/i386/main.c
new file mode 100644
index 0000000000..846d46a426
--- /dev/null
+++ b/payloads/libpayload/i386/main.c
@@ -0,0 +1,79 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
+ */
+
+#include <arch/types.h>
+
+/* This structure seeds the stack.  We provide
+   the return address of our main function, and
+   further down, the address of the function 
+   that we call when we leave and try to restore
+   the original stack.  At the very bottom of the
+   stack we store the orignal stack pointer
+   from the calling application
+*/
+
+static void start_main(void);
+extern void _leave(void);
+
+static struct {
+	uint32_t eip[2];
+	uint32_t raddr[2];
+	uint32_t esp;
+} initial_stack __attribute__((section (".istack"))) = {
+	{ (uint32_t) start_main, 0 },
+	{ (uint32_t) _leave, 0 },
+	(uint32_t) &initial_stack,
+};
+
+void * _istack = &initial_stack;
+
+/* This is our C entry function - set up the system
+   and jump into the payload entry point */
+
+static void start_main(void)
+{
+	extern int main(void);
+
+	/* Set up the consoles */
+	console_init();
+
+	/* Gather system information */
+	lib_get_sysinfo();
+
+	/* Any other system init that has to happen before the
+	   user gets control goes here. */
+
+	/* Go to the entry point */
+
+	/* in the future we may care about the return value */
+	(void) main();
+
+	/* Returning here will go to the _leave function to return
+	   us to the original context */
+}