soc/amd/common/block/acpi: Add ACPI HEST table

Adds skeleton code so that the HEST ACPI table is included as part of
the ACPI tables propagated to the OS.

The ACPI table can be included by mainboards by selecting
SOC_AMD_COMMON_BLOCK_ACPI_HEST.

TEST=Select the option, build the mainboard and see the output in Linux:
[    0.282277] HEST: Table parsing has been initialized.

Change-Id: I69886a19764d6974cbe129a8a6bf717f7808fb08
Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88113
Reviewed-by: Benjamin Doron <benjamin.doron00@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anand Vaikar <a.vaikar2021@gmail.com>

src/soc/amd/common/block/acpi/Kconfig

@@ -29,6 +29,10 @@ config SOC_AMD_COMMON_BLOCK_ACPI_CPU_POWER_STATE
 config SOC_AMD_COMMON_BLOCK_ACPI_GPIO
 	bool
 
+config SOC_AMD_COMMON_BLOCK_ACPI_HEST
+	bool
+	select ACPI_HEST
+
 config SOC_AMD_COMMON_BLOCK_ACPI_IVRS
 	bool
 

src/soc/amd/common/block/acpi/Makefile.mk

@@ -7,6 +7,7 @@ smm-y += acpi.c
 ramstage-y += pm_state.c
 ramstage-y += tables.c
 ramstage-$(CONFIG_ACPI_BERT) += bert.c
+ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPI_HEST) += hest.c
 ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPI_ALIB) += alib.c
 ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPI_CPPC) += cppc.c
 ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPI_CPU_POWER_STATE) += cpu_power_state.c

src/soc/amd/common/block/acpi/hest.c

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi_apei.h>
+#include <acpi/acpi_gnvs.h>
+#include <cbmem.h>
+#include <console/console.h>
+
+uintptr_t acpi_soc_fill_hest(acpi_hest_t *hest, uintptr_t current, void *log_mem)
+{
+	hest->error_source_count = 0;
+	return current;
+}