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lib/cbmem_top: Add a common cbmem_top implementation

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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>
This commit is contained in:
Arthur Heymans
2019-10-23 17:25:58 +02:00
committed by Patrick Georgi
parent 44874482fe
commit 340e4b8090
49 changed files with 86 additions and 46 deletions
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23
src/lib/imd_cbmem.c
View File

@ -13,6 +13,7 @@
* GNU General Public License for more details.
*/
#include <assert.h>
#include <boot/coreboot_tables.h>
#include <bootstate.h>
#include <bootmem.h>
@ -44,6 +45,28 @@
(!CONFIG(ARCH_X86) || ENV_RAMSTAGE || ENV_POSTCAR || \
!CONFIG(CAR_GLOBAL_MIGRATION))
/* The program loader passes on cbmem_top and the program entry point
has to fill in the _cbmem_top_ptr symbol based on the calling arguments. */
uintptr_t _cbmem_top_ptr;
void *cbmem_top(void)
{
if (ENV_ROMSTAGE
|| ((ENV_POSTCAR || ENV_RAMSTAGE)
&& !CONFIG(RAMSTAGE_CBMEM_TOP_ARG))) {
MAYBE_STATIC_BSS void *top = NULL;
if (top)
return top;
top = cbmem_top_chipset();
return top;
}
if ((ENV_POSTCAR || ENV_RAMSTAGE) && CONFIG(RAMSTAGE_CBMEM_TOP_ARG))
return (void *)_cbmem_top_ptr;
dead_code();
}
static inline struct imd *cbmem_get_imd(void)
{
if (CAN_USE_GLOBALS) {