1 files changed, 61 insertions, 0 deletions
diff --git a/lib/efi_loader/efi_acpi.c b/lib/efi_loader/efi_acpi.c
new file mode 100644
index 00000000000..4422b31ac6a
--- /dev/null
+++ b/lib/efi_loader/efi_acpi.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  EFI application ACPI tables support
+ *
+ *  Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#define LOG_CATEGORY LOGC_EFI
+
+#include <efi_loader.h>
+#include <log.h>
+#include <mapmem.h>
+#include <acpi/acpi_table.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_GUID;
+
+/*
+ * Install the ACPI table as a configuration table.
+ *
+ * Return:	status code
+ */
+efi_status_t efi_acpi_register(void)
+{
+	ulong addr, start, end;
+	efi_status_t ret;
+
+	/*
+	 * The bloblist is already marked reserved. For now, we don't bother
+	 * marking it with EFI_ACPI_RECLAIM_MEMORY since we would need to cut a
+	 * hole in the EFI_BOOT_SERVICES_CODE region added by
+	 * add_u_boot_and_runtime(). At some point that function could create a
+	 * more detailed map.
+	 */
+	if (IS_ENABLED(CONFIG_BLOBLIST_TABLES))
+		return EFI_SUCCESS;
+
+	/* Mark space used for tables */
+	start = ALIGN_DOWN(gd->arch.table_start, EFI_PAGE_MASK);
+	end = ALIGN(gd->arch.table_end, EFI_PAGE_MASK);
+	ret = efi_add_memory_map(start, end - start, EFI_ACPI_RECLAIM_MEMORY);
+	if (ret != EFI_SUCCESS)
+		return ret;
+	if (gd->arch.table_start_high) {
+		start = ALIGN_DOWN(gd->arch.table_start_high, EFI_PAGE_MASK);
+		end = ALIGN(gd->arch.table_end_high, EFI_PAGE_MASK);
+		ret = efi_add_memory_map(start, end - start,
+					 EFI_ACPI_RECLAIM_MEMORY);
+		if (ret != EFI_SUCCESS)
+			return ret;
+	}
+
+	addr = gd_acpi_start();
+	log_debug("EFI using ACPI tables at %lx\n", addr);
+
+	/* And expose them to our EFI payload */
+	return efi_install_configuration_table(&acpi_guid,
+					       (void *)(ulong)addr);
+}