[XS] Change in coreboot[master]: arch/arm64: Hook up FADT

[Arthur Heymans (Code Review)]

Attention is currently required from: Julius Werner.

Arthur Heymans has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/76180?usp=email )

Change subject: arch/arm64: Hook up FADT
......................................................................

arch/arm64: Hook up FADT

Arm needs very little of FADT. Just a HW reduced model bit and low power
idle bit set.

Signed-off-by: Arthur Heymans 
Change-Id: I197975f91cd47e418c8583cb0e7b7ea2330363b2
---
M src/arch/arm64/Makefile.inc
A src/arch/arm64/acpi.c
2 files changed, 8 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/80/76180/1

diff --git a/src/arch/arm64/Makefile.inc b/src/arch/arm64/Makefile.inc
index 6b49743..81abe37 100644
--- a/src/arch/arm64/Makefile.inc
+++ b/src/arch/arm64/Makefile.inc
@@ -118,6 +118,7 @@
 ramstage-$(CONFIG_ARM64_USE_ARM_TRUSTED_FIRMWARE) += bl31.c
 ramstage-y += transition.c transition_asm.S
 ramstage-$(CONFIG_PAYLOAD_FIT_SUPPORT) += fit_payload.c
+ramstage-$(CONFIG_HAVE_ACPI_SUPPORT) += acpi.c

rmodules_arm64-y += memset.S
 rmodules_arm64-y += memcpy.S
diff --git a/src/arch/arm64/acpi.c b/src/arch/arm64/acpi.c
new file mode 100644
index 0000000..30ccc30
--- /dev/null
+++ b/src/arch/arm64/acpi.c
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#include <acpi/acpi.h>
+
+void arch_fill_fadt(acpi_fadt_t *fadt)
+{
+	fadt->flags |= ACPI_FADT_HW_REDUCED_ACPI | ACPI_FADT_LOW_PWR_IDLE_S0;
+}