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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 The ChromiumOS Authors. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* This file contains entry/exit functions for each stage during coreboot
* execution (bootblock entry and ramstage exit will depend on external
* loading.
*
* Unlike other files, this one should be compiled with a -m option to
* specify a pre-determined instruction set. This is to ensure consistency
* in the CPU operating mode (ARM or Thumb) when hand-off between stages
* occurs.
*
* Entry points must be placed at the location the previous stage jumps
* to (the lowest address in the stage image). This is done by giving
* stage_entry() its own section in .text and placing it first in the
* linker script.
*/
#include <arch/stages.h>
#include <arch/armv7/include/common.h>
#include <arch/cache.h>
void stage_entry(void)
{
main();
}
/* we had marked 'doit' as 'noreturn'.
* There is no apparent harm in leaving it as something we can return from, and in the one
* case where we call a payload, the payload is allowed to return.
* Hence, leave it as something we can return from.
*/
void stage_exit(void *addr)
{
void (*doit)(void) = addr;
/* make sure any code we installed is written to memory. Not all ARM have
* unified caches.
*/
dcache_clean_invalidate_all();
/* Because most stages copy code to memory, it's a safe and hygienic thing
* to flush the icache here.
*/
icache_invalidate_all();
doit();
}