From 10aaf7e24e94ed2533c57433506a13258bb91aa8 Mon Sep 17 00:00:00 2001
From: Rafal Kupiec <belliash@codingworkshop.eu.org>
Date: Sat, 23 Dec 2023 10:01:28 +0100
Subject: [PATCH] Implement BlClearConsoleLine() routine

---
 sdk/xtdk/bltypes.h        |  2 ++
 xtldr2/console.c          | 28 ++++++++++++++++++++++++++++
 xtldr2/includes/bootman.h |  4 ++++
 xtldr2/protocol.c         |  1 +
 4 files changed, 35 insertions(+)

diff --git a/sdk/xtdk/bltypes.h b/sdk/xtdk/bltypes.h
index f28f763..7cdf24a 100644
--- a/sdk/xtdk/bltypes.h
+++ b/sdk/xtdk/bltypes.h
@@ -47,6 +47,7 @@ typedef EFI_STATUS (*PBL_ALLOCATE_PAGES)(IN UINT64 Size, OUT PEFI_PHYSICAL_ADDRE
 typedef EFI_STATUS (*PBL_ALLOCATE_POOL)(IN UINT_PTR Size, OUT PVOID *Memory);
 typedef VOID (*PBL_BOOTMENU_INITIALIZE_OS_LIST)(OUT PXTBL_BOOTMENU_ITEM MenuEntries, OUT PULONG EntriesCount, OUT PULONG DefaultId);
 typedef EFI_STATUS (*PBL_CLOSE_VOLUME)(IN PEFI_HANDLE VolumeHandle);
+typedef VOID (*PBL_CLEAR_CONSOLE_LINE)(IN ULONGLONG LineNo);
 typedef VOID (*PBL_CONSOLE_CLEAR_SCREEN)();
 typedef VOID (*PBL_CONSOLE_DISABLE_CURSOR)();
 typedef VOID (*PBL_CONSOLE_ENABLE_CURSOR)();
@@ -114,6 +115,7 @@ typedef struct _XTBL_LOADER_PROTOCOL
 {
     struct
     {
+        PBL_CLEAR_CONSOLE_LINE ClearLine;
         PBL_CONSOLE_CLEAR_SCREEN ClearScreen;
         PBL_CONSOLE_DISABLE_CURSOR DisableCursor;
         PBL_CONSOLE_ENABLE_CURSOR EnableCursor;
diff --git a/xtldr2/console.c b/xtldr2/console.c
index 0703d8a..e41b8ce 100644
--- a/xtldr2/console.c
+++ b/xtldr2/console.c
@@ -9,6 +9,34 @@
 #include <xtldr.h>
 
 
+/**
+ * Clears a specified line on the UEFI text console.
+ *
+ * @param LineNo
+ *        Supplies a line number to clear.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+VOID
+BlClearConsoleLine(IN ULONGLONG LineNo)
+{
+    UINT_PTR Index, ResX, ResY;
+
+    /* Query console mode */
+    BlQueryConsoleMode(&ResX, &ResY);
+
+    /* Set cursor position and clear line */
+    BlSetCursorPosition(0, LineNo);
+    for(Index = 0; Index < ResX; Index++)
+    {
+        /* Clear line */
+        BlConsoleWrite(L" ");
+    }
+}
+
 /**
  * This routine clears the UEFI console screen.
  *
diff --git a/xtldr2/includes/bootman.h b/xtldr2/includes/bootman.h
index e81566a..6655df5 100644
--- a/xtldr2/includes/bootman.h
+++ b/xtldr2/includes/bootman.h
@@ -16,6 +16,10 @@
 typedef VOID (BMPRINTCHAR)(IN USHORT Character);
 
 /* XTLDR routines forward references */
+XTCDECL
+VOID
+BlClearConsoleLine(IN ULONGLONG LineNo);
+
 XTCDECL
 VOID
 BlClearConsoleScreen();
diff --git a/xtldr2/protocol.c b/xtldr2/protocol.c
index e7f133e..8b1b5fd 100644
--- a/xtldr2/protocol.c
+++ b/xtldr2/protocol.c
@@ -90,6 +90,7 @@ BlpRegisterXtLoaderProtocol()
     EFI_HANDLE Handle = NULL;
 
     /* Set all routines available via loader protocol */
+    LdrProtocol.Console.ClearLine = BlClearConsoleLine;
     LdrProtocol.Console.ClearScreen = BlClearConsoleScreen;
     LdrProtocol.Console.DisableCursor = BlDisableConsoleCursor;
     LdrProtocol.Console.EnableCursor = BlEnableConsoleCursor;