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coreboot: add caching loaded ramstage interface

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Instead of hard coding the policy for how a relocated ramstage
image is saved add an interface. The interface consists of two
functions.  cache_loaded_ramstage() and load_cached_ramstage()
are the functions to cache and load the relocated ramstage,
respectively. There are default implementations which cache and
load the relocated ramstage just below where the ramstage runs.

Change-Id: I4346e873d8543e7eee4c1cd484847d846f297bb0
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2805
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Aaron Durbin
2013-02-15 23:26:52 -06:00
committed by Ronald G. Minnich
parent 8ce667e506
commit de1f890186
2 changed files with 71 additions and 27 deletions
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21
src/include/cbfs.h
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@@ -83,5 +83,26 @@ int selfboot(struct lb_memory *mem, struct cbfs_payload *payload);
/* Defined in individual arch / board implementation. */
int init_default_cbfs_media(struct cbfs_media *media);
#if CONFIG_RELOCATABLE_RAMSTAGE && defined(__PRE_RAM__)
/* The cache_loaded_ramstage() and load_cached_ramstage() functions are defined
* to be weak so that board and chipset code may override them. Their job is to
* cache and load the ramstage for quick S3 resume. By default a copy of the
* relocated ramstage is saved just below the running ramstage region. These
* functions are only valid during romstage. */
struct romstage_handoff;
/* The implementer of cache_loaded_ramstage() needs to ensure that the
* reserve_* fields in in romstage_handoff reflect the memory footprint of the
* ramstage (including cached region). Note that the handoff variable can be
* NULL. */
void __attribute__((weak))
cache_loaded_ramstage(struct romstage_handoff *handoff, void *ramstage_base,
uint32_t ramstage_size, void *entry_point);
/* Return NULL on error or entry point on success. */
void * __attribute__((weak))
load_cached_ramstage(struct romstage_handoff *handoff);
#endif /* CONFIG_RELOCATABLE_RAMSTAGE */
#endif