src/boot/efi/graphics.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /*
   3  * This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the GNU Lesser General Public License as published by
   5  * the Free Software Foundation; either version 2.1 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * Copyright (C) 2012-2013 Kay Sievers <kay@vrfy.org>
  14  * Copyright (C) 2012 Harald Hoyer <harald@redhat.com>
  15  * Copyright (C) 2013 Intel Corporation
  16  *   Authored by Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
  17  */
  18
  19 #include <efi.h>
  20 #include <efilib.h>
  21
  22 #include "graphics.h"
  23 #include "util.h"
  24
  25 EFI_STATUS graphics_mode(BOOLEAN on) {
  26         #define EFI_CONSOLE_CONTROL_PROTOCOL_GUID \
  27                 { 0xf42f7782, 0x12e, 0x4c12, { 0x99, 0x56, 0x49, 0xf9, 0x43, 0x4, 0xf7, 0x21 } };
  28
  29         struct _EFI_CONSOLE_CONTROL_PROTOCOL;
  30
  31         typedef enum {
  32                 EfiConsoleControlScreenText,
  33                 EfiConsoleControlScreenGraphics,
  34                 EfiConsoleControlScreenMaxValue,
  35         } EFI_CONSOLE_CONTROL_SCREEN_MODE;
  36
  37         typedef EFI_STATUS (EFIAPI *EFI_CONSOLE_CONTROL_PROTOCOL_GET_MODE)(
  38                 struct _EFI_CONSOLE_CONTROL_PROTOCOL *This,
  39                 EFI_CONSOLE_CONTROL_SCREEN_MODE *Mode,
  40                 BOOLEAN *UgaExists,
  41                 BOOLEAN *StdInLocked
  42         );
  43
  44         typedef EFI_STATUS (EFIAPI *EFI_CONSOLE_CONTROL_PROTOCOL_SET_MODE)(
  45                 struct _EFI_CONSOLE_CONTROL_PROTOCOL *This,
  46                 EFI_CONSOLE_CONTROL_SCREEN_MODE Mode
  47         );
  48
  49         typedef EFI_STATUS (EFIAPI *EFI_CONSOLE_CONTROL_PROTOCOL_LOCK_STD_IN)(
  50                 struct _EFI_CONSOLE_CONTROL_PROTOCOL *This,
  51                 CHAR16 *Password
  52         );
  53
  54         typedef struct _EFI_CONSOLE_CONTROL_PROTOCOL {
  55                 EFI_CONSOLE_CONTROL_PROTOCOL_GET_MODE GetMode;
  56                 EFI_CONSOLE_CONTROL_PROTOCOL_SET_MODE SetMode;
  57                 EFI_CONSOLE_CONTROL_PROTOCOL_LOCK_STD_IN LockStdIn;
  58         } EFI_CONSOLE_CONTROL_PROTOCOL;
  59
  60         EFI_GUID ConsoleControlProtocolGuid = EFI_CONSOLE_CONTROL_PROTOCOL_GUID;
  61         EFI_CONSOLE_CONTROL_PROTOCOL *ConsoleControl = NULL;
  62         EFI_CONSOLE_CONTROL_SCREEN_MODE new;
  63         EFI_CONSOLE_CONTROL_SCREEN_MODE current;
  64         BOOLEAN uga_exists;
  65         BOOLEAN stdin_locked;
  66         EFI_STATUS err;
  67
  68         err = LibLocateProtocol(&ConsoleControlProtocolGuid, (VOID **)&ConsoleControl);
  69         if (EFI_ERROR(err))
  70                 /* console control protocol is nonstandard and might not exist. */
  71                 return err == EFI_NOT_FOUND ? EFI_SUCCESS : err;
  72
  73         /* check current mode */
  74         err = uefi_call_wrapper(ConsoleControl->GetMode, 4, ConsoleControl, &current, &uga_exists, &stdin_locked);
  75         if (EFI_ERROR(err))
  76                 return err;
  77
  78         /* do not touch the mode */
  79         new  = on ? EfiConsoleControlScreenGraphics : EfiConsoleControlScreenText;
  80         if (new == current)
  81                 return EFI_SUCCESS;
  82
  83         err = uefi_call_wrapper(ConsoleControl->SetMode, 2, ConsoleControl, new);
  84
  85         /* some firmware enables the cursor when switching modes */
  86         uefi_call_wrapper(ST->ConOut->EnableCursor, 2, ST->ConOut, FALSE);
  87
  88         return err;
  89 }