diff options
Diffstat (limited to 'src/stmf0/ao_boot_chain.c')
| -rw-r--r-- | src/stmf0/ao_boot_chain.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/stmf0/ao_boot_chain.c b/src/stmf0/ao_boot_chain.c new file mode 100644 index 00000000..83a543a0 --- /dev/null +++ b/src/stmf0/ao_boot_chain.c @@ -0,0 +1,67 @@ +/* + * 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(); +} |