soc/amd/noncar/memmap.c: factor out FSP-specific SMM region code

Factor out the common FSP-specific code to get the location and size of
the SMM region from the HOB that FSP has put into memory. This moves
FSP-specific code out of the common AMD SoC code into the FSP-specific
common AMD SoC code folder.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ie137bb0f4e7438a1694810ae71592a34f9d8c86e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76760
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>

src/soc/amd/common/block/cpu/noncar/memmap.c

@@ -5,8 +5,6 @@
 #include <console/console.h>
 #include <cbmem.h>
 #include <cpu/x86/smm.h>
-#include <fsp/util.h>
-#include <FspGuids.h>
 #include <memrange.h>
 #include <types.h>
 
@@ -36,25 +34,8 @@ const struct memmap_early_dram *memmap_get_early_dram_usage(void)
 void smm_region(uintptr_t *start, size_t *size)
 {
 	static int once;
-	static uintptr_t smm_start;
-	static size_t smm_size;
 
-	*start = smm_start;
+	fsp_get_smm_region(start, size);
-	*size = smm_size;
-	if (*size && *start)
-		return;
-
-	struct range_entry tseg;
-
-	if (fsp_find_range_hob(&tseg, AMD_FSP_TSEG_HOB_GUID.b) != CB_SUCCESS) {
-		printk(BIOS_ERR, "unable to find TSEG HOB\n");
-		return;
-	}
-
-	smm_start = (uintptr_t)range_entry_base(&tseg);
-	smm_size =  range_entry_size(&tseg);
-	*start = smm_start;
-	*size = smm_size;
 
 	if (!once) {
 		clear_tvalid();

src/soc/amd/common/block/include/amdblocks/memmap.h

@@ -17,4 +17,6 @@ struct memmap_early_dram {
 void memmap_stash_early_dram_usage(void);
 const struct memmap_early_dram *memmap_get_early_dram_usage(void);
 
+void fsp_get_smm_region(uintptr_t *start, size_t *size);
+
 #endif /* AMD_BLOCK_MEMMAP_H */

src/soc/amd/common/fsp/Makefile.inc

@@ -1,7 +1,9 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_PLATFORM_USES_FSP2_0),y)
+romstage-y += fsp_memmap.c
 romstage-y += fsp_reset.c
 romstage-y += fsp_validate.c
+ramstage-y += fsp_memmap.c
 ramstage-y += fsp_report_resources.c
 ramstage-y += fsp_reset.c
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += fsp-acpi.c

src/soc/amd/common/fsp/fsp_memmap.c

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/memmap.h>
+#include <console/console.h>
+#include <fsp/util.h>
+#include <FspGuids.h>
+#include <memrange.h>
+#include <types.h>
+
+void fsp_get_smm_region(uintptr_t *start, size_t *size)
+{
+	static uintptr_t smm_start;
+	static size_t smm_size;
+
+	*start = smm_start;
+	*size = smm_size;
+	if (*size && *start)
+		return;
+
+	struct range_entry tseg;
+
+	if (fsp_find_range_hob(&tseg, AMD_FSP_TSEG_HOB_GUID.b) != CB_SUCCESS) {
+		printk(BIOS_ERR, "unable to find TSEG HOB\n");
+		return;
+	}
+
+	smm_start = (uintptr_t)range_entry_base(&tseg);
+	smm_size =  range_entry_size(&tseg);
+	*start = smm_start;
+	*size = smm_size;
+}