x86: Move CSRT table to a writer function

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

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

2 files changed, 51 insertions, 0 deletions

diff --git a/lib/acpi/Makefile b/lib/acpi/Makefile
index 552d499fde..f9b504988f 100644
--- a/lib/acpi/Makefile
+++ b/lib/acpi/Makefile
@@ -10,6 +10,7 @@ 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 += csrt.o
 
 # Sandbox does not build a .asl file
 ifndef CONFIG_SANDBOX
diff --git a/lib/acpi/csrt.c b/lib/acpi/csrt.c
new file mode 100644
index 0000000000..7606931841
--- /dev/null
+++ b/lib/acpi/csrt.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Write an ACPI Core System Resource Table (CSRT)
+ *
+ * Copyright 2021 Google LLC
+ */
+
+#define LOG_CATEGORY LOGC_ACPI
+
+#include <common.h>
+#include <mapmem.h>
+#include <tables_csum.h>
+#include <acpi/acpi_table.h>
+#include <dm/acpi.h>
+
+__weak u32 acpi_fill_csrt(u32 current)
+{
+	return 0;
+}
+
+int acpi_write_csrt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
+{
+	struct acpi_table_header *header;
+	struct acpi_csrt *csrt;
+	uint ptr;
+
+	csrt = ctx->current;
+	header = &csrt->header;
+
+	memset(csrt, '\0', sizeof(struct acpi_csrt));
+
+	/* Fill out header fields */
+	acpi_fill_header(header, "CSRT");
+	header->length = sizeof(struct acpi_csrt);
+	header->revision = 0;
+
+	ptr = acpi_fill_csrt(map_to_sysmem(csrt));
+	if (!ptr)
+		return log_msg_ret("fill", -ENOENT);
+
+	/* (Re)calculate length and checksum */
+	header->length = (ulong)ctx->current - (ulong)csrt;
+	header->checksum = table_compute_checksum(csrt, header->length);
+
+	acpi_add_table(ctx, csrt);
+	acpi_inc(ctx, csrt->header.length);
+
+	return 0;
+}
+ACPI_WRITER(5csrt, "CSRT", acpi_write_csrt, 0);