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Diffstat (limited to 'src/arch/arm/stages.c')
-rw-r--r-- | src/arch/arm/stages.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/arch/arm/stages.c b/src/arch/arm/stages.c new file mode 100644 index 000000000000..38d1b1928a76 --- /dev/null +++ b/src/arch/arm/stages.c @@ -0,0 +1,61 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2012 Google Inc. + * + * 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/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_all(); + /* Because most stages copy code to memory, it's a safe and hygienic thing + * to flush the icache here. + */ + icache_invalidate_all(); + doit(); +} |