x86: Move FACS table to a writer function

Move this table over to use a writer function, moving the code from the
x86 implementation.

Add a pointer to the DSDT in struct acpi_ctx so we can reference it later.

Signed-off-by: Simon Glass <sjg@chromium.org>

2 files changed, 34 insertions, 0 deletions

diff --git a/lib/acpi/Makefile b/lib/acpi/Makefile
index 4674a92..9f70fe6 100644
--- a/lib/acpi/Makefile
+++ b/lib/acpi/Makefile
@@ -10,4 +10,5 @@ obj-y += acpi_writer.o
 # With QEMU the ACPI tables come from there, not from U-Boot
 ifndef CONFIG_QEMU
 obj-y += base.o
+obj-y += facs.o
 endif
diff --git a/lib/acpi/facs.c b/lib/acpi/facs.c
new file mode 100644
index 0000000..8a1568f
--- /dev/null
+++ b/lib/acpi/facs.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Write an ACPI Firmware ACPI Control Structure (FACS) table
+ *
+ * Copyright 2021 Google LLC
+ */
+
+#include <common.h>
+#include <acpi/acpi_table.h>
+#include <dm/acpi.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);