x86: Move SSDT 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>
diff --git a/lib/acpi/ssdt.c b/lib/acpi/ssdt.c
new file mode 100644
index 0000000..659c1aa
--- /dev/null
+++ b/lib/acpi/ssdt.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Write an ACPI Secondary System Descriptor Table (SSDT) table
+ *
+ * Copyright 2021 Google LLC
+ */
+
+#define LOG_CATEGORY LOGC_ACPI
+
+#include <common.h>
+#include <acpi/acpi_table.h>
+#include <dm/acpi.h>
+#include <tables_csum.h>
+
+int acpi_write_ssdt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
+{
+ struct acpi_table_header *ssdt;
+ int ret;
+
+ ssdt = ctx->current;
+ memset((void *)ssdt, '\0', sizeof(struct acpi_table_header));
+
+ acpi_fill_header(ssdt, "SSDT");
+ memcpy(ssdt->oem_table_id, OEM_TABLE_ID, sizeof(ssdt->oem_table_id));
+ ssdt->revision = acpi_get_table_revision(ACPITAB_SSDT);
+ ssdt->aslc_revision = 1;
+ ssdt->length = sizeof(struct acpi_table_header);
+
+ acpi_inc(ctx, sizeof(struct acpi_table_header));
+
+ ret = acpi_fill_ssdt(ctx);
+ if (ret) {
+ ctx->current = ssdt;
+ return log_msg_ret("fill", ret);
+ }
+
+ /* (Re)calculate length and checksum */
+ ssdt->length = ctx->current - (void *)ssdt;
+ ssdt->checksum = table_compute_checksum((void *)ssdt, ssdt->length);
+ log_debug("SSDT at %p, length %x\n", ssdt, ssdt->length);
+
+ /* Drop the table if it is empty */
+ if (ssdt->length == sizeof(struct acpi_table_header))
+ return log_msg_ret("fill", -ENOENT);
+ acpi_add_table(ctx, ssdt);
+
+ return 0;
+}
+ACPI_WRITER(6ssdt, "SSDT", acpi_write_ssdt, 0);