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>
diff --git a/src/lib/imd_cbmem.c b/src/lib/imd_cbmem.c
index be135c2..cbd4b8f 100644
--- a/src/lib/imd_cbmem.c
+++ b/src/lib/imd_cbmem.c
@@ -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) {