From f337eb3972afcccabe86fe663202a758337d0ab8 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Tue, 25 Feb 2014 22:40:01 +0100
Subject: [PATCH] MdeModulePkg: TerminalDxe: set xterm resolution on mode
 change (RH only)

The

  CSI Ps ; Ps ; Ps t

escape sequence serves for window manipulation. We can use the

  CSI 8 ; <rows> ; <columns> t

sequence to adapt eg. the xterm window size to the selected console mode.

Notes about the 20160608b-988715a -> 20170228-c325e41585e3 rebase:

- refresh commit 519b9751573e against various context changes

Notes about the 20170228-c325e41585e3 -> 20171011-92d07e48907f rebase:

- Refresh downstream-only commit 2909e025db68 against "MdeModulePkg.dec"
  context change from upstream commits e043f7895b83 ("MdeModulePkg: Add
  PCD PcdPteMemoryEncryptionAddressOrMask", 2017-02-27) and 76081dfcc5b2
  ("MdeModulePkg: Add PROMPT&HELP string of pcd to UNI file", 2017-03-03).

Reference: <http://rtfm.etla.org/xterm/ctlseq.html>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit 2909e025db6878723b49644a8a0cf160d07e6444)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 MdeModulePkg/MdeModulePkg.dec                 |  4 +++
 .../Console/TerminalDxe/TerminalConOut.c      | 30 +++++++++++++++++++
 .../Console/TerminalDxe/TerminalDxe.inf       |  2 ++
 3 files changed, 36 insertions(+)

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 6a6d9660ed..2dc1cf94e2 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -1936,6 +1936,10 @@
   # @Prompt The address mask when memory encryption is enabled.
   gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask|0x0|UINT64|0x30001047
 
+  ## Controls whether TerminalDxe outputs an XTerm resize sequence on terminal
+  #  mode change.
+  gEfiMdeModulePkgTokenSpaceGuid.PcdResizeXterm|FALSE|BOOLEAN|0x00010080
+
 [PcdsPatchableInModule]
   ## Specify memory size with page number for PEI code when
   #  Loading Module at Fixed Address feature is enabled.
diff --git a/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConOut.c b/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConOut.c
index 4d7218e415..295e7641a5 100644
--- a/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConOut.c
+++ b/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConOut.c
@@ -13,6 +13,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 **/
 
+#include <Library/PrintLib.h>
+
 #include "Terminal.h"
 
 //
@@ -86,6 +88,16 @@ CHAR16 mSetCursorPositionString[]  = { ESC, '[', '0', '0', ';', '0', '0', 'H', 0
 CHAR16 mCursorForwardString[]      = { ESC, '[', '0', '0', 'C', 0 };
 CHAR16 mCursorBackwardString[]     = { ESC, '[', '0', '0', 'D', 0 };
 
+//
+// Note that this is an ASCII format string, taking two INT32 arguments:
+// rows, columns.
+//
+// A %d (INT32) format specification can expand to at most 11 characters.
+//
+CHAR8 mResizeTextAreaFormatString[] = "\x1B[8;%d;%dt";
+#define RESIZE_SEQ_SIZE (sizeof mResizeTextAreaFormatString + 2 * (11 - 2))
+
+
 //
 // Body of the ConOut functions
 //
@@ -508,6 +520,24 @@ TerminalConOutSetMode (
     return EFI_DEVICE_ERROR;
   }
 
+  if (PcdGetBool (PcdResizeXterm)) {
+    CHAR16 ResizeSequence[RESIZE_SEQ_SIZE];
+
+    UnicodeSPrintAsciiFormat (
+      ResizeSequence,
+      sizeof ResizeSequence,
+      mResizeTextAreaFormatString,
+      (INT32) TerminalDevice->TerminalConsoleModeData[ModeNumber].Rows,
+      (INT32) TerminalDevice->TerminalConsoleModeData[ModeNumber].Columns
+      );
+    TerminalDevice->OutputEscChar = TRUE;
+    Status                        = This->OutputString (This, ResizeSequence);
+    TerminalDevice->OutputEscChar = FALSE;
+    if (EFI_ERROR (Status)) {
+      return EFI_DEVICE_ERROR;
+    }
+  }
+
   This->Mode->Mode  = (INT32) ModeNumber;
 
   Status            = This->ClearScreen (This);
diff --git a/MdeModulePkg/Universal/Console/TerminalDxe/TerminalDxe.inf b/MdeModulePkg/Universal/Console/TerminalDxe/TerminalDxe.inf
index 0780296798..bd2ba828a6 100644
--- a/MdeModulePkg/Universal/Console/TerminalDxe/TerminalDxe.inf
+++ b/MdeModulePkg/Universal/Console/TerminalDxe/TerminalDxe.inf
@@ -60,6 +60,7 @@
   DebugLib
   PcdLib
   BaseLib
+  PrintLib
 
 [Guids]
   ## SOMETIMES_PRODUCES ## Variable:L"ConInDev"
@@ -88,6 +89,7 @@
 [Pcd]
   gEfiMdePkgTokenSpaceGuid.PcdDefaultTerminalType           ## SOMETIMES_CONSUMES
   gEfiMdeModulePkgTokenSpaceGuid.PcdErrorCodeSetVariable    ## CONSUMES
+  gEfiMdeModulePkgTokenSpaceGuid.PcdResizeXterm             ## CONSUMES
 
 # [Event]
 # # Relative timer event set by UnicodeToEfiKey(), used to be one 2 seconds input timeout.