vc/amd/pi/00670F00/binaryPI: cache the AGESA dispatcher

Instead of repeatedly walking cbfs for the AGESA blob and parsing it
cache the resulting dispatcher value. There's only one dispatcher table
so use it. The resulting change is that this work is done one time per
stage.

BUG=b:70401101
TEST=Booted and noted only one lookup per stage.

Change-Id: Iaa4aecc384108d66d7c68fc5fb9ac1c3f40da905
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/22789
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Justin TerAvest <teravest@chromium.org>

2 files changed, 25 insertions, 0 deletions

diff --git a/src/soc/amd/common/agesawrapper.c b/src/soc/amd/common/agesawrapper.c
index b9391836ce..ec76b4d35c 100644
--- a/src/soc/amd/common/agesawrapper.c
+++ b/src/soc/amd/common/agesawrapper.c
@@ -14,6 +14,7 @@
  */
 
 #include "agesawrapper.h"
+#include <arch/early_variables.h>
 #include <cbfs.h>
 #include <cbmem.h>
 #include <delay.h>
@@ -378,3 +379,24 @@ const void *agesawrapper_locate_module (const CHAR8 name[8])
 
 	return module;
 }
+
+static MODULE_ENTRY agesa_dispatcher CAR_GLOBAL;
+
+MODULE_ENTRY agesa_get_dispatcher(void)
+{
+	const AMD_MODULE_HEADER *module;
+	static const CHAR8 id[8] = AGESA_ID;
+	MODULE_ENTRY val = car_get_var(agesa_dispatcher);
+
+	if (val != NULL)
+		return val;
+
+	module = agesawrapper_locate_module(id);
+	if (!module)
+		return NULL;
+
+	val = module->ModuleDispatcher;
+	car_set_var(agesa_dispatcher, val);
+
+	return val;
+}
diff --git a/src/soc/amd/common/agesawrapper.h b/src/soc/amd/common/agesawrapper.h
index 6ddc658981..08ac5968ca 100644
--- a/src/soc/amd/common/agesawrapper.h
+++ b/src/soc/amd/common/agesawrapper.h
@@ -31,6 +31,9 @@ enum {
 	PICK_CRAT,
 };
 
+/* Return current dispatcher or NULL on error. */
+MODULE_ENTRY agesa_get_dispatcher(void);
+
 AGESA_STATUS agesawrapper_amdinitreset(void);
 AGESA_STATUS agesawrapper_amdinitearly(void);
 AGESA_STATUS agesawrapper_amdinitenv(void);