soc/amd/genoa: Add Global NVS

Change-Id: I8d64236fc81e848503535db6f52e93328a60404c
Signed-off-by: Varshit Pandya <pandyavarshit@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78391
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>

src/mainboard/amd/onyx/dsdt.asl

@@ -10,4 +10,6 @@ DefinitionBlock (
 	ACPI_TABLE_CREATOR,
 	0x00010001	/* OEM Revision */
 )
+{	/* Start of ASL file */
+	#include <globalnvs.asl>
 } /* End of ASL file */

src/soc/amd/genoa/acpi/globalnvs.asl

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/*
+ * NOTE: The layout of the GNVS structure below must match the layout in
+ * soc/amd/genoa/include/soc/nvs.h !!!
+ */
+
+Field (GNVS, ByteAcc, NoLock, Preserve)
+{
+	/* Miscellaneous */
+	PM1I,	64,	// 0x00 - 0x07 - System Wake Source - PM1 Index
+	GPEI,	64,	// 0x08 - 0x0f - GPE Wake Source
+}

src/soc/amd/genoa/include/soc/nvs.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/* TODO: Check if this is still correct */
+
+/*
+ * NOTE: The layout of the global_nvs structure below must match the layout
+ * in soc/soc/amd/genoa/acpi/globalnvs.asl !!!
+ *
+ */
+
+#ifndef AMD_GENOA_NVS_H
+#define AMD_GENOA_NVS_H
+
+#include <stdint.h>
+
+struct __packed global_nvs {
+	/* Miscellaneous */
+	uint64_t	pm1i; /* 0x00 - 0x07 - System Wake Source - PM1 Index */
+	uint64_t	gpei; /* 0x08 - 0x0f - GPE Wake Source */
+};
+
+#endif /* AMD_GENOA_NVS_H */