From 3b413c99f3a5087710f4932b4ba61c2646ae84b9 Mon Sep 17 00:00:00 2001

From: Laszlo Ersek <lersek@redhat.com>

Date: Tue, 25 Feb 2014 18:40:35 +0100

Subject: [PATCH] MdeModulePkg: TerminalDxe: add other text resolutions

When the console output is multiplexed to several devices by

ConSplitterDxe, then ConSplitterDxe builds an intersection of text modes

supported by all console output devices.

Two notable output devices are provided by:

(1) MdeModulePkg/Universal/Console/GraphicsConsoleDxe,

(2) MdeModulePkg/Universal/Console/TerminalDxe.

GraphicsConsoleDxe supports four modes at most -- see

InitializeGraphicsConsoleTextMode() and "mGraphicsConsoleModeData":

(1a) 80x25 (required by the UEFI spec as mode 0),

(1b) 80x50 (not necessarily supported, but if it is, then the UEFI spec

     requires the driver to provide it as mode 1),

(1c) 100x31 (corresponding to graphics resolution 800x600, which the UEFI

     spec requires from all plug-in graphics devices),

(1d) "full screen" resolution, derived form the underlying GOP's

     horizontal and vertical resolutions with division by EFI_GLYPH_WIDTH

     (8) and EFI_GLYPH_HEIGHT (19), respectively.

The automatic "full screen resolution" makes GraphicsConsoleDxe's

character console very flexible. However, TerminalDxe (which runs on

serial ports) only provides the following fixed resolutions -- see

InitializeTerminalConsoleTextMode() and "mTerminalConsoleModeData":

(2a) 80x25 (required by the UEFI spec as mode 0),

(2b) 80x50 (since the character resolution of a serial device cannot be

     interrogated easily, this is added unconditionally as mode 1),

(2c) 100x31 (since the character resolution of a serial device cannot be

     interrogated easily, this is added unconditionally as mode 2).

When ConSplitterDxe combines (1) and (2), multiplexing console output to

both video output and serial terminal, the list of commonly supported text

modes (ie. the "intersection") comprises:

(3a) 80x25, unconditionally, from (1a) and (2a),

(3b) 80x50, if the graphics console provides at least 640x950 pixel

     resolution, from (1b) and (2b)

(3c) 100x31, if the graphics device is a plug-in one (because in that case

     800x600 is a mandated pixel resolution), from (1c) and (2c).

Unfortunately, the "full screen resolution" (1d) of the GOP-based text

console is not available in general.

Mitigate this problem by extending "mTerminalConsoleModeData" with a

handful of text resolutions that are derived from widespread maximal pixel

resolutions. This way TerminalDxe won't cause ConSplitterDxe to filter out

the most frequent (1d) values from the intersection, and eg. the MODE

command in the UEFI shell will offer the "best" (ie. full screen)

resolution too.

Upstream status: three calendar months (with on-and-off discussion and

patches) have not been enough to find a solution to this problem that

would please all stakeholders.

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

- adapt commit 0bc77c63de03 (code and commit message) to upstream commit

  390b95a49c14 ("MdeModulePkg/TerminalDxe: Refine

  InitializeTerminalConsoleTextMode", 2017-01-10).

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

- no changes

Signed-off-by: Laszlo Ersek <lersek@redhat.com>

(cherry picked from commit 99dc3720ac86059f60156197328cc433603c536e)

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

---

 .../Universal/Console/TerminalDxe/Terminal.c  | 41 +++++++++++++++++--

 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/MdeModulePkg/Universal/Console/TerminalDxe/Terminal.c b/MdeModulePkg/Universal/Console/TerminalDxe/Terminal.c

index a98b690c8b..ded5513c74 100644

--- a/MdeModulePkg/Universal/Console/TerminalDxe/Terminal.c

+++ b/MdeModulePkg/Universal/Console/TerminalDxe/Terminal.c

@@ -115,9 +115,44 @@ TERMINAL_DEV  mTerminalDevTemplate = {

 };

 TERMINAL_CONSOLE_MODE_DATA mTerminalConsoleModeData[] = {

-  {80,  25},

-  {80,  50},

-  {100, 31},

+  {   80,  25 }, // from graphics resolution  640 x  480

+  {   80,  50 }, // from graphics resolution  640 x  960

+  {  100,  25 }, // from graphics resolution  800 x  480

+  {  100,  31 }, // from graphics resolution  800 x  600

+  {  104,  32 }, // from graphics resolution  832 x  624

+  {  120,  33 }, // from graphics resolution  960 x  640

+  {  128,  31 }, // from graphics resolution 1024 x  600

+  {  128,  40 }, // from graphics resolution 1024 x  768

+  {  144,  45 }, // from graphics resolution 1152 x  864

+  {  144,  45 }, // from graphics resolution 1152 x  870

+  {  160,  37 }, // from graphics resolution 1280 x  720

+  {  160,  40 }, // from graphics resolution 1280 x  760

+  {  160,  40 }, // from graphics resolution 1280 x  768

+  {  160,  42 }, // from graphics resolution 1280 x  800

+  {  160,  50 }, // from graphics resolution 1280 x  960

+  {  160,  53 }, // from graphics resolution 1280 x 1024

+  {  170,  40 }, // from graphics resolution 1360 x  768

+  {  170,  40 }, // from graphics resolution 1366 x  768

+  {  175,  55 }, // from graphics resolution 1400 x 1050

+  {  180,  47 }, // from graphics resolution 1440 x  900

+  {  200,  47 }, // from graphics resolution 1600 x  900

+  {  200,  63 }, // from graphics resolution 1600 x 1200

+  {  210,  55 }, // from graphics resolution 1680 x 1050

+  {  240,  56 }, // from graphics resolution 1920 x 1080

+  {  240,  63 }, // from graphics resolution 1920 x 1200

+  {  240,  75 }, // from graphics resolution 1920 x 1440

+  {  250, 105 }, // from graphics resolution 2000 x 2000

+  {  256,  80 }, // from graphics resolution 2048 x 1536

+  {  256, 107 }, // from graphics resolution 2048 x 2048

+  {  320,  75 }, // from graphics resolution 2560 x 1440

+  {  320,  84 }, // from graphics resolution 2560 x 1600

+  {  320, 107 }, // from graphics resolution 2560 x 2048

+  {  350, 110 }, // from graphics resolution 2800 x 2100

+  {  400, 126 }, // from graphics resolution 3200 x 2400

+  {  480, 113 }, // from graphics resolution 3840 x 2160

+  {  512, 113 }, // from graphics resolution 4096 x 2160

+  {  960, 227 }, // from graphics resolution 7680 x 4320

+  { 1024, 227 }, // from graphics resolution 8192 x 4320

   //

   // New modes can be added here.

   //