[PATCH 1/2] efi_loader: support for Ctrl() device path node

[Heinrich Schuchardt]

* Add the definitions for Ctrl() device path nodes.
* Implement Ctrl() nodes in the device path to text protocol.

Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
---
 include/efi_api.h                        | 6 ++++++
 lib/efi_loader/efi_device_path_to_text.c | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/include/efi_api.h b/include/efi_api.h
index 2d18d25a71..c57868abbd 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -570,6 +570,7 @@ struct efi_mac_addr {
 #define DEVICE_PATH_TYPE_HARDWARE_DEVICE       0x01
 #  define DEVICE_PATH_SUB_TYPE_MEMORY          0x03
 #  define DEVICE_PATH_SUB_TYPE_VENDOR          0x04
+#  define DEVICE_PATH_SUB_TYPE_CONTROLLER      0x05
 
 struct efi_device_path_memory {
        struct efi_device_path dp;
@@ -584,6 +585,11 @@ struct efi_device_path_vendor {
        u8 vendor_data[];
 } __packed;
 
+struct efi_device_path_controller {
+       struct efi_device_path dp;
+       u32 controller_number;
+} __packed;
+
 #define DEVICE_PATH_TYPE_ACPI_DEVICE           0x02
 #  define DEVICE_PATH_SUB_TYPE_ACPI_DEVICE     0x01
 
diff --git a/lib/efi_loader/efi_device_path_to_text.c 
b/lib/efi_loader/efi_device_path_to_text.c
index 9062058ac2..9c0b39311a 100644
--- a/lib/efi_loader/efi_device_path_to_text.c
+++ b/lib/efi_loader/efi_device_path_to_text.c
@@ -77,6 +77,13 @@ static char *dp_hardware(char *s, struct efi_device_path *dp)
                s += sprintf(s, ")");
                break;
        }
+       case DEVICE_PATH_SUB_TYPE_CONTROLLER: {
+               struct efi_device_path_controller *cdp =
+                       (struct efi_device_path_controller *)dp;
+
+               s += sprintf(s, "Ctrl(0x%0x)", cdp->controller_number);
+               break;
+       }
        default:
                s = dp_unknown(s, dp);
                break;
-- 
2.39.2