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/*
* Copyright © 2013 Keith Packard <keithp@keithp.com>
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#include <ao_boot.h>
void
ao_boot_chain(uint32_t *base)
{
uint32_t sp;
uint32_t pc;
sp = base[0];
pc = base[1];
if (0x08000100 <= pc && pc <= 0x08200000 && (pc & 1) == 1) {
asm ("mov sp, %0" : : "r" (sp));
asm ("mov lr, %0" : : "r" (pc));
asm ("bx lr");
}
}
#define AO_BOOT_SIGNAL 0x5a5aa5a5
#define AO_BOOT_CHECK 0xc3c33c3c
struct ao_boot {
uint32_t *base;
uint32_t signal;
uint32_t check;
};
static struct ao_boot __attribute__ ((section(".boot"))) ao_boot;
int
ao_boot_check_chain(void)
{
if (ao_boot.signal == AO_BOOT_SIGNAL && ao_boot.check == AO_BOOT_CHECK) {
ao_boot.signal = 0;
ao_boot.check = 0;
if (ao_boot.base == AO_BOOT_FORCE_LOADER)
return 0;
ao_boot_chain(ao_boot.base);
}
return 1;
}
void
ao_boot_reboot(uint32_t *base)
{
ao_boot.base = base;
ao_boot.signal = AO_BOOT_SIGNAL;
ao_boot.check = AO_BOOT_CHECK;
ao_arch_reboot();
}
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