diff options
| author | Arthur Heymans <arthur@aheymans.xyz> | 2019-10-23 17:25:58 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-11-01 11:44:51 +0000 |
| commit | 340e4b80904feb6c5c21497fc52966854fa5ee79 (patch) | |
| tree | 4026de0ec0cc41f51dd121a0be76642a8d0a286d /src/include | |
| parent | 44874482fec69a849b06c378aa3eb69e75425256 (diff) | |
lib/cbmem_top: Add a common cbmem_top implementation
This adds a common cbmem_top implementation to all coreboot target.
In romstage a static variable will be used to cache the result of
cbmem_top_romstage.
In ramstage if CONFIG_RAMSTAGE_CBMEM_TOP_ARG is set a global variable
needs to be populated by the stage entry with the value passed via the
calling arguments. if CONFIG_RAMSTAGE_CBMEM_TOP_ARG is not set the
same implementation as will be used as in romstage.
Change-Id: Ie767542ee25483acc9a56785ce20a885e9a63098
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36273
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/cbmem.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/include/cbmem.h b/src/include/cbmem.h index 4005fa205a..a22c420ad3 100644 --- a/src/include/cbmem.h +++ b/src/include/cbmem.h @@ -73,7 +73,18 @@ void cbmem_top_init(void); * below 4GiB for 32bit coreboot builds. On 64bit coreboot builds there's no * upper limit. This should not be called before memory is initialized. */ +/* The assumption is made that the result of cbmem_top_romstage fits in the size + of uintptr_t in the ramstage. */ +extern uintptr_t _cbmem_top_ptr; void *cbmem_top(void); +/* With CONFIG_RAMSTAGE_CBMEM_TOP_ARG set, the result of cbmem_top is passed via + * calling arguments to the next stage and saved in the global _cbmem_top_ptr + * global variable. Only a romstage callback needs to be implemented by the + * platform. It is up to the stages after romstage to save the calling argument + * in the _cbmem_top_ptr symbol. Without CONFIG_RAMSTAGE_CBMEM_TOP_ARG the same + * implementation as used in romstage will be used. + */ +void *cbmem_top_chipset(void); /* Add a cbmem entry of a given size and id. These return NULL on failure. The * add function performs a find first and do not check against the original |