From a11602f5e2ef930be5b693ddfd0c789a1bd4c60c Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Tue, 25 Feb 2014 22:40:01 +0100
Subject: MdeModulePkg: TerminalDxe: set xterm resolution on mode change (RH
 only)

Notes about the RHEL-8.1/20190308-89910a39dcfd [edk2-stable201903] ->
RHEL-8.2/20190904-37eef91017ad [edk2-stable201908] rebase:

- Conflict in "MdeModulePkg/MdeModulePkg.dec" due to upstream commits
  - 1103ba946aee ("MdeModulePkg: Add Capsule On Disk related definition.",
    2019-06-26),
  - 1c7b3eb84631 ("MdeModulePkg/DxeIpl: Introduce PCD
    PcdUse5LevelPageTable", 2019-08-09),
  with easy manual resolution.

Notes about the RHEL-8.0/20180508-ee3198e672e2 ->
RHEL-8.1/20190308-89910a39dcfd rebase:

- no change

Notes about the RHEL-7.6/ovmf-20180508-2.gitee3198e672e2.el7 ->
RHEL-8.0/20180508-ee3198e672e2 rebase:

- reorder the rebase changelog in the commit message so that it reads like
  a blog: place more recent entries near the top
- no changes to the patch body

Notes about the 20171011-92d07e48907f -> 20180508-ee3198e672e2 rebase:

- no change

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).

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

- refresh commit 519b9751573e against various context changes

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.

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)
(cherry picked from commit b9c5c901f25e48d68eef6e78a4abca00e153f574)
(cherry picked from commit b7f6115b745de8cbc5214b6ede33c9a8558beb90)
(cherry picked from commit 67415982afdc77922aa37496c981adeb4351acdb)
(cherry picked from commit cfccb98d13e955beb0b93b4a75a973f30c273ffc)
---
 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 19935c88fa..5690bbd8b3 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -2002,6 +2002,10 @@
   # @Prompt Capsule On Disk relocation device path.
   gEfiMdeModulePkgTokenSpaceGuid.PcdCodRelocationDevPath|{0xFF}|VOID*|0x0000002f
 
+  ## 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 7ef655cca5..1113252df2 100644
--- a/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConOut.c
+++ b/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConOut.c
@@ -7,6 +7,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
 
+#include <Library/PrintLib.h>
+
 #include "Terminal.h"
 
 //
@@ -80,6 +82,16 @@ 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
 //
@@ -502,6 +514,24 @@ 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 24e164ef4d..d1160ed1c7 100644
--- a/MdeModulePkg/Universal/Console/TerminalDxe/TerminalDxe.inf
+++ b/MdeModulePkg/Universal/Console/TerminalDxe/TerminalDxe.inf
@@ -55,6 +55,7 @@
   DebugLib
   PcdLib
   BaseLib
+  PrintLib
 
 [Guids]
   ## SOMETIMES_PRODUCES ## Variable:L"ConInDev"
@@ -83,6 +84,7 @@
 [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.
-- 
2.18.1