efi_loader: implement InstallProtocolInterface

efi_install_protocol_interface up to now only returned an error code.

The patch implements the UEFI specification for InstallProtocolInterface
with the exception that it will not create new handles.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

include/efi_api.h

@@ -58,7 +58,7 @@ struct efi_boot_services {
 	efi_status_t (EFIAPI *signal_event)(void *event);
 	efi_status_t (EFIAPI *close_event)(void *event);
 	efi_status_t (EFIAPI *check_event)(void *event);
-
+#define EFI_NATIVE_INTERFACE	0x00000000
 	efi_status_t (EFIAPI *install_protocol_interface)(
 			void **handle, efi_guid_t *protocol,
 			int protocol_interface_type, void *protocol_interface);

lib/efi_loader/efi_boottime.c

@@ -303,10 +303,62 @@ static efi_status_t EFIAPI efi_install_protocol_interface(void **handle,
 			efi_guid_t *protocol, int protocol_interface_type,
 			void *protocol_interface)
 {
+	struct list_head *lhandle;
+	int i;
+	efi_status_t r;
+
 	EFI_ENTRY("%p, %p, %d, %p", handle, protocol, protocol_interface_type,
 		  protocol_interface);
-	return EFI_EXIT(EFI_OUT_OF_RESOURCES);
+
+	if (!handle || !protocol ||
+	    protocol_interface_type != EFI_NATIVE_INTERFACE) {
+		r = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	/* Create new handle if requested. */
+	if (!*handle) {
+		r = EFI_OUT_OF_RESOURCES;
+		goto out;
+	}
+	/* Find object. */
+	list_for_each(lhandle, &efi_obj_list) {
+		struct efi_object *efiobj;
+		efiobj = list_entry(lhandle, struct efi_object, link);
+
+		if (efiobj->handle != *handle)
+			continue;
+		/* Check if protocol is already installed on the handle. */
+		for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
+			struct efi_handler *handler = &efiobj->protocols[i];
+
+			if (!handler->guid)
+				continue;
+			if (!guidcmp(handler->guid, protocol)) {
+				r = EFI_INVALID_PARAMETER;
+				goto out;
+			}
+		}
+		/* Install protocol in first empty slot. */
+		for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
+			struct efi_handler *handler = &efiobj->protocols[i];
+
+			if (handler->guid)
+				continue;
+
+			handler->guid = protocol;
+			handler->protocol_interface = protocol_interface;
+			r = EFI_SUCCESS;
+			goto out;
+		}
+		r = EFI_OUT_OF_RESOURCES;
+		goto out;
+	}
+	r = EFI_INVALID_PARAMETER;
+out:
+	return EFI_EXIT(r);
 }
+
 static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle,
 			efi_guid_t *protocol, void *old_interface,
 			void *new_interface)