1 files changed, 43 insertions, 0 deletions
diff --git a/src/boot/efi/graphics.c b/src/boot/efi/graphics.c
new file mode 100644
index 0000000..dc646bc
--- /dev/null
+++ b/src/boot/efi/graphics.c
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright © 2013 Intel Corporation
+ *   Authored by Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
+ */
+
+#include <efi.h>
+#include <efilib.h>
+
+#include "graphics.h"
+#include "missing_efi.h"
+#include "util.h"
+
+EFI_STATUS graphics_mode(bool on) {
+        EFI_CONSOLE_CONTROL_PROTOCOL *ConsoleControl = NULL;
+        EFI_CONSOLE_CONTROL_SCREEN_MODE new;
+        EFI_CONSOLE_CONTROL_SCREEN_MODE current;
+        BOOLEAN uga_exists;
+        BOOLEAN stdin_locked;
+        EFI_STATUS err;
+
+        err = BS->LocateProtocol((EFI_GUID *) EFI_CONSOLE_CONTROL_GUID, NULL, (void **) &ConsoleControl);
+        if (err != EFI_SUCCESS)
+                /* console control protocol is nonstandard and might not exist. */
+                return err == EFI_NOT_FOUND ? EFI_SUCCESS : err;
+
+        /* check current mode */
+        err =ConsoleControl->GetMode(ConsoleControl, &current, &uga_exists, &stdin_locked);
+        if (err != EFI_SUCCESS)
+                return err;
+
+        /* do not touch the mode */
+        new  = on ? EfiConsoleControlScreenGraphics : EfiConsoleControlScreenText;
+        if (new == current)
+                return EFI_SUCCESS;
+
+        err =ConsoleControl->SetMode(ConsoleControl, new);
+
+        /* some firmware enables the cursor when switching modes */
+        ST->ConOut->EnableCursor(ST->ConOut, false);
+
+        return err;
+}