src/boot/efi/graphics.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /*
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU Lesser General Public License as published by
   6  * the Free Software Foundation; either version 2.1 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * Copyright (C) 2012-2013 Kay Sievers <kay@vrfy.org>
  15  * Copyright (C) 2012 Harald Hoyer <harald@redhat.com>
  16  * Copyright (C) 2013 Intel Corporation
  17  *   Authored by Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
  18  */
  19
  20 #include <efi.h>
  21 #include <efilib.h>
  22
  23 #include "graphics.h"
  24 #include "util.h"
  25
  26 EFI_STATUS graphics_mode(BOOLEAN on) {
  27         #define EFI_CONSOLE_CONTROL_PROTOCOL_GUID \
  28                 { 0xf42f7782, 0x12e, 0x4c12, { 0x99, 0x56, 0x49, 0xf9, 0x43, 0x4, 0xf7, 0x21 } };
  29
  30         struct _EFI_CONSOLE_CONTROL_PROTOCOL;
  31
  32         typedef enum {
  33                 EfiConsoleControlScreenText,
  34                 EfiConsoleControlScreenGraphics,
  35                 EfiConsoleControlScreenMaxValue,
  36         } EFI_CONSOLE_CONTROL_SCREEN_MODE;
  37
  38         typedef EFI_STATUS (EFIAPI *EFI_CONSOLE_CONTROL_PROTOCOL_GET_MODE)(
  39                 struct _EFI_CONSOLE_CONTROL_PROTOCOL *This,
  40                 EFI_CONSOLE_CONTROL_SCREEN_MODE *Mode,
  41                 BOOLEAN *UgaExists,
  42                 BOOLEAN *StdInLocked
  43         );
  44
  45         typedef EFI_STATUS (EFIAPI *EFI_CONSOLE_CONTROL_PROTOCOL_SET_MODE)(
  46                 struct _EFI_CONSOLE_CONTROL_PROTOCOL *This,
  47                 EFI_CONSOLE_CONTROL_SCREEN_MODE Mode
  48         );
  49
  50         typedef EFI_STATUS (EFIAPI *EFI_CONSOLE_CONTROL_PROTOCOL_LOCK_STD_IN)(
  51                 struct _EFI_CONSOLE_CONTROL_PROTOCOL *This,
  52                 CHAR16 *Password
  53         );
  54
  55         typedef struct _EFI_CONSOLE_CONTROL_PROTOCOL {
  56                 EFI_CONSOLE_CONTROL_PROTOCOL_GET_MODE GetMode;
  57                 EFI_CONSOLE_CONTROL_PROTOCOL_SET_MODE SetMode;
  58                 EFI_CONSOLE_CONTROL_PROTOCOL_LOCK_STD_IN LockStdIn;
  59         } EFI_CONSOLE_CONTROL_PROTOCOL;
  60
  61         EFI_GUID ConsoleControlProtocolGuid = EFI_CONSOLE_CONTROL_PROTOCOL_GUID;
  62         EFI_CONSOLE_CONTROL_PROTOCOL *ConsoleControl = NULL;
  63         EFI_CONSOLE_CONTROL_SCREEN_MODE new;
  64         EFI_CONSOLE_CONTROL_SCREEN_MODE current;
  65         BOOLEAN uga_exists;
  66         BOOLEAN stdin_locked;
  67         EFI_STATUS err;
  68
  69         err = LibLocateProtocol(&ConsoleControlProtocolGuid, (VOID **)&ConsoleControl);
  70         if (EFI_ERROR(err))
  71                 /* console control protocol is nonstandard and might not exist. */
  72                 return err == EFI_NOT_FOUND ? EFI_SUCCESS : err;
  73
  74         /* check current mode */
  75         err = uefi_call_wrapper(ConsoleControl->GetMode, 4, ConsoleControl, &current, &uga_exists, &stdin_locked);
  76         if (EFI_ERROR(err))
  77                 return err;
  78
  79         /* do not touch the mode */
  80         new  = on ? EfiConsoleControlScreenGraphics : EfiConsoleControlScreenText;
  81         if (new == current)
  82                 return EFI_SUCCESS;
  83
  84         err = uefi_call_wrapper(ConsoleControl->SetMode, 2, ConsoleControl, new);
  85
  86         /* some firmware enables the cursor when switching modes */
  87         uefi_call_wrapper(ST->ConOut->EnableCursor, 2, ST->ConOut, FALSE);
  88
  89         return err;
  90 }