cpu/x86/smm: Move relocatable stub params

These stub params need to be synced with the code in smm_stub.S and
are consumed by both the smmloader and smmloader_v2. So it is better
to have the definition located in one place.

Change-Id: Ide3e0cb6dea3359fa9ae660eab627499832817c9
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50761
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/x86/smm/smm_module_loader.c

@@ -26,18 +26,6 @@ __attribute__((aligned(16)));
  * The components are assumed to consist of one consecutive region.
  */
 
-/* These parameters are used by the SMM stub code. A pointer to the params
- * is also passed to the C-base handler. */
-struct smm_stub_params {
-	u32 stack_size;
-	u32 stack_top;
-	u32 c_handler;
-	u32 c_handler_arg;
-	u32 fxsave_area;
-	u32 fxsave_area_size;
-	struct smm_runtime runtime;
-} __packed;
-
 /*
  * The stub is the entry point that sets up protected mode and stacks for each
  * CPU. It then calls into the SMM handler module. It is encoded as an rmodule.

src/cpu/x86/smm/smm_module_loaderv2.c

@@ -27,18 +27,6 @@ __attribute__((aligned(16)));
  * The components are assumed to consist of one consecutive region.
  */
 
-/* These parameters are used by the SMM stub code. A pointer to the params
- * is also passed to the C-base handler. */
-struct smm_stub_params {
-	u32 stack_size;
-	u32 stack_top;
-	u32 c_handler;
-	u32 c_handler_arg;
-	u32 fxsave_area;
-	u32 fxsave_area_size;
-	struct smm_runtime runtime;
-} __packed;
-
 /*
  * The stub is the entry point that sets up protected mode and stacks for each
  * CPU. It then calls into the SMM handler module. It is encoded as an rmodule.

src/include/cpu/x86/smm.h

@@ -81,6 +81,18 @@ struct smm_module_params {
 	const uintptr_t *canary;
 };
 
+/* These parameters are used by the SMM stub code. A pointer to the params
+ * is also passed to the C-base handler. */
+struct smm_stub_params {
+	u32 stack_size;
+	u32 stack_top;
+	u32 c_handler;
+	u32 c_handler_arg;
+	u32 fxsave_area;
+	u32 fxsave_area_size;
+	struct smm_runtime runtime;
+} __packed;
+
 /* smm_handler_t is called with arg of smm_module_params pointer. */
 typedef asmlinkage void (*smm_handler_t)(void *);