[vmware] Add VMware logfile console (CONSOLE_VMWARE)

Allow iPXE console output to be sent to the VMware logfile via the
GuestRPC mechanism.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/i386/interface/vmware/vmconsole.c

@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2012 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.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * VMware logfile console
+ *
+ */
+
+#include <string.h>
+#include <ipxe/console.h>
+#include <ipxe/lineconsole.h>
+#include <ipxe/init.h>
+#include <ipxe/guestrpc.h>
+
+/** VMware logfile console buffer size */
+#define VMCONSOLE_BUFSIZE 128
+
+/** VMware logfile console GuestRPC channel */
+static int vmconsole_channel;
+
+/** VMware logfile console line buffer */
+static struct {
+	char prefix[4];
+	char message[VMCONSOLE_BUFSIZE];
+} vmconsole_buffer = {
+	.prefix = "log ",
+};
+
+/** VMware logfile line console */
+static struct line_console vmconsole_line = {
+	.buffer = vmconsole_buffer.message,
+	.len = sizeof ( vmconsole_buffer.message ),
+};
+
+/** VMware logfile console recursion marker */
+static int vmconsole_entered;
+
+/**
+ * Print a character to VMware logfile console
+ *
+ * @v character		Character to be printed
+ */
+static void vmconsole_putchar ( int character ) {
+	int rc;
+
+	/* Ignore if we are already mid-logging */
+	if ( vmconsole_entered )
+		return;
+
+	/* Fill line buffer */
+	if ( line_putchar ( &vmconsole_line, character ) == 0 )
+		return;
+
+	/* Guard against re-entry */
+	vmconsole_entered = 1;
+
+	/* Send log message */
+	if ( ( rc = guestrpc_command ( vmconsole_channel,
+				       vmconsole_buffer.prefix, NULL, 0 ) ) <0){
+		DBG ( "VMware console could not send log message: %s\n",
+		      strerror ( rc ) );
+	}
+
+	/* Clear re-entry flag */
+	vmconsole_entered = 0;
+}
+
+/** VMware logfile console driver */
+struct console_driver vmconsole __console_driver = {
+	.putchar = vmconsole_putchar,
+	.disabled = 1,
+};
+
+/**
+ * Initialise VMware logfile console
+ *
+ */
+static void vmconsole_init ( void ) {
+	int rc;
+
+	/* Attempt to open console */
+	vmconsole_channel = guestrpc_open();
+	if ( vmconsole_channel < 0 ) {
+		rc = vmconsole_channel;
+		DBG ( "VMware console could not be initialised: %s\n",
+		      strerror ( rc ) );
+		return;
+	}
+
+	/* Mark console as available */
+	vmconsole.disabled = 0;
+}
+
+/**
+ * VMware logfile console initialisation function
+ */
+struct init_fn vmconsole_init_fn __init_fn ( INIT_CONSOLE ) = {
+	.initialise = vmconsole_init,
+};

src/config/config.c

@@ -86,6 +86,9 @@ REQUIRE_OBJECT ( efi_console );
 #ifdef CONSOLE_LINUX
 REQUIRE_OBJECT ( linux_console );
 #endif
+#ifdef CONSOLE_VMWARE
+REQUIRE_OBJECT ( vmconsole );
+#endif
 
 /*
  * Drag in all requested network protocols

src/config/console.h

@@ -20,6 +20,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 //#define	CONSOLE_BTEXT		/* Who knows what this does? */
 //#define	CONSOLE_PC_KBD		/* Direct access to PC keyboard */
 //#define	CONSOLE_SYSLOG		/* Syslog console */
+//#define	CONSOLE_VMWARE		/* VMware logfile console */
 
 #define	KEYBOARD_MAP	us