[driver] Add ability to write text to boot splash screen

Signed-off-by: Michael Brown <mbrown@fensystems.co.uk>

src/driver/boottext.c

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ntddk.h>
+#include <ntstrsafe.h>
+#include <stdarg.h>
+#include "sanbootconf.h"
+#include "boottext.h"
+
+/* Maximum length of string to print */
+#define BOOT_TEXT_MAX_LEN 128
+
+/* Boot text colour */
+#define BOOT_TEXT_COLOUR 15 /* White */
+
+/* Boot text area left-hand edge */
+#define BOOT_TEXT_AREA_LEFT 8
+
+/* Boot text area right-hand edge */
+#define BOOT_TEXT_AREA_RIGHT 631
+
+/* Boot text area top edge */
+#define BOOT_TEXT_AREA_TOP 14
+
+/* Boot text area bottom edge */
+#define BOOT_TEXT_AREA_BOTTOM 111
+
+/* Definitions taken from ReactOS' inbvfuncs.h */
+typedef BOOLEAN ( NTAPI * INBV_RESET_DISPLAY_PARAMETERS ) ( ULONG Cols,
+							    ULONG Rows );
+typedef VOID ( NTAPI * INBV_DISPLAY_STRING_FILTER ) ( PCHAR *Str );
+VOID NTAPI InbvAcquireDisplayOwnership ( VOID );
+BOOLEAN NTAPI InbvCheckDisplayOwnership ( VOID );
+VOID NTAPI InbvNotifyDisplayOwnershipLost ( IN INBV_RESET_DISPLAY_PARAMETERS
+					    Callback );
+VOID NTAPI InbvEnableBootDriver ( IN BOOLEAN Enable );
+VOID NTAPI InbvInstallDisplayStringFilter ( IN INBV_DISPLAY_STRING_FILTER
+					    DisplayFilter );
+BOOLEAN NTAPI InbvIsBootDriverInstalled ( VOID );
+BOOLEAN NTAPI InbvDisplayString ( IN PCHAR String );
+BOOLEAN NTAPI InbvEnableDisplayString ( IN BOOLEAN Enable );
+BOOLEAN NTAPI InbvResetDisplay ( VOID );
+VOID NTAPI InbvSetScrollRegion ( IN ULONG Left, IN ULONG Top, IN ULONG Width,
+				 IN ULONG Height );
+VOID NTAPI InbvSetTextColor ( IN ULONG Color );
+VOID NTAPI InbvSolidColorFill ( IN ULONG Left, IN ULONG Top, IN ULONG Width,
+				IN ULONG Height, IN ULONG Color );
+VOID NTAPI InbvSetProgressBarSubset ( IN ULONG Floor, IN ULONG Ceiling );
+
+/**
+ * Print text to boot screen
+ *
+ * @v fmt		Format string
+ * @v ...		Arguments
+ */
+VOID BootPrint ( const char *fmt, ... ) {
+	static BOOLEAN initialised = FALSE;
+	char buf[BOOT_TEXT_MAX_LEN];
+	va_list args;
+
+	/* Generate string to print */
+	va_start ( args, fmt );
+	RtlStringCbVPrintfA ( buf, sizeof ( buf ), fmt, args );
+	va_end ( args );
+
+	/* Log to debugger, if attached */
+	DbgPrint ( "%s", buf );
+
+	/* Configure display */
+	if ( ! InbvCheckDisplayOwnership() )
+		InbvAcquireDisplayOwnership();
+	if ( ! initialised ) {
+		InbvSetScrollRegion ( BOOT_TEXT_AREA_LEFT,
+				      BOOT_TEXT_AREA_TOP,
+				      BOOT_TEXT_AREA_RIGHT,
+				      BOOT_TEXT_AREA_BOTTOM );
+		initialised = TRUE;
+	}
+	InbvSetTextColor ( BOOT_TEXT_COLOUR );
+	InbvEnableDisplayString ( TRUE );
+	/* Avoid switching to the "chkdsk" screen */
+	InbvInstallDisplayStringFilter ( NULL );
+
+	/* Print the string */
+	InbvDisplayString ( buf );
+}

src/driver/boottext.h

@@ -0,0 +1,24 @@
+#ifndef _BOOTTEXT_H
+#define _BOOTTEXT_H
+
+/*
+ * Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+extern VOID BootPrint ( const char *fmt, ... );
+
+#endif /* _BOOTTEXT_H */

src/driver/sources

@@ -8,4 +8,4 @@ TARGETLIBS = $(DDK_LIB_PATH)\ndis.lib $(DDK_LIB_PATH)\ntstrsafe.lib $(DDK_LIB_PA
 
 MSC_WARNING_LEVEL = /W4 /Wp64 /WX
 
-SOURCES = sanbootconf.c registry.c acpi.c nic.c ibft.c abft.c sbft.c
+SOURCES = sanbootconf.c registry.c acpi.c nic.c ibft.c abft.c sbft.c boottext.c