1 files changed, 35 insertions, 0 deletions
diff --git a/lib/acpi/facs.c b/lib/acpi/facs.c
new file mode 100644
index 00000000000..86c28120c7e
--- /dev/null
+++ b/lib/acpi/facs.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Write an ACPI Firmware ACPI Control Structure (FACS) table
+ *
+ * Copyright 2021 Google LLC
+ */
+
+#define LOG_CATEGORY LOGC_ACPI
+
+#include <acpi/acpi_table.h>
+#include <dm/acpi.h>
+#include <linux/string.h>
+
+int acpi_write_facs(struct acpi_ctx *ctx, const struct acpi_writer *entry)
+{
+	struct acpi_facs *facs = ctx->current;
+
+	memset((void *)facs, '\0', sizeof(struct acpi_facs));
+
+	memcpy(facs->signature, "FACS", 4);
+	facs->length = sizeof(struct acpi_facs);
+	facs->hardware_signature = 0;
+	facs->firmware_waking_vector = 0;
+	facs->global_lock = 0;
+	facs->flags = 0;
+	facs->x_firmware_waking_vector_l = 0;
+	facs->x_firmware_waking_vector_h = 0;
+	facs->version = 1;
+
+	ctx->facs = facs;
+	acpi_inc(ctx, sizeof(struct acpi_facs));
+
+	return 0;
+}
+ACPI_WRITER(1facs, "FACS", acpi_write_facs, 0);