ACPI: Add and fill gnvs_ptr for smm_runtime

Change-Id: I823d04a4851437b4267a60886e5ab205bb2e1b10
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42464
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/cpu/x86/smm/smm_module_loader.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <string.h>
+#include <acpi/acpi_gnvs.h>
 #include <rmodule.h>
 #include <cpu/x86/smm.h>
 #include <commonlib/helpers.h>
@@ -261,6 +262,7 @@ static int smm_module_setup_stub(void *smbase, size_t smm_size,
 	stub_params->runtime.smm_size = smm_size;
 	stub_params->runtime.save_state_size = params->per_cpu_save_state_size;
 	stub_params->runtime.num_cpus = params->num_concurrent_stacks;
+	stub_params->runtime.gnvs_ptr = (uintptr_t)acpi_get_gnvs();
 
 	/* Initialize the APIC id to CPU number table to be 1:1 */
 	for (i = 0; i < params->num_concurrent_stacks; i++)

src/cpu/x86/smm/smm_stub.S

@@ -36,6 +36,8 @@ save_state_size:
 .long 0
 num_cpus:
 .long 0
+gnvs_ptr:
+.long 0
 /* allows the STM to bring up SMM in 32-bit mode */
 start32_offset:
 .long smm_trampoline32 - _start

src/include/cpu/x86/smm.h

@@ -61,6 +61,7 @@ struct smm_runtime {
 	u32 smm_size;
 	u32 save_state_size;
 	u32 num_cpus;
+	u32 gnvs_ptr;
 	/* STM's 32bit entry into SMI handler */
 	u32 start32_offset;
 	/* The apic_id_to_cpu provides a mapping from APIC id to CPU number.