[cmdline] Add "pciscan" command to allow iteration over PCI devices

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

src/config/config.c

@@ -260,6 +260,9 @@ REQUIRE_OBJECT ( sync_cmd );
 #ifdef NSLOOKUP_CMD
 REQUIRE_OBJECT ( nslookup_cmd );
 #endif
+#ifdef PCI_CMD
+REQUIRE_OBJECT ( pci_cmd );
+#endif
 
 /*
  * Drag in miscellaneous objects

src/config/general.h

@@ -129,6 +129,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 //#define REBOOT_CMD		/* Reboot command */
 //#define POWEROFF_CMD		/* Power off command */
 //#define IMAGE_TRUST_CMD	/* Image trust management commands */
+//#define PCI_CMD		/* PCI commands */
 
 /*
  * ROM-specific options

src/hci/commands/pci_cmd.c

@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2013 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <stdio.h>
+#include <getopt.h>
+#include <ipxe/pci.h>
+#include <ipxe/command.h>
+#include <ipxe/parseopt.h>
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * PCI commands
+ *
+ */
+
+/** "pciscan" options */
+struct pciscan_options {};
+
+/** "pciscan" option list */
+static struct option_descriptor pciscan_opts[] = {};
+
+/** "pciscan" command descriptor */
+static struct command_descriptor pciscan_cmd =
+	COMMAND_DESC ( struct pciscan_options, pciscan_opts, 1, 1,
+		       "<setting>" );
+
+/**
+ * "pciscan" command
+ *
+ * @v argc		Argument count
+ * @v argv		Argument list
+ * @ret rc		Return status code
+ */
+static int pciscan_exec ( int argc, char **argv ) {
+	struct pciscan_options opts;
+	struct named_setting setting;
+	struct pci_device pci;
+	unsigned long prev;
+	int next;
+	int len;
+	int rc;
+
+	/* Parse options */
+	if ( ( rc = parse_options ( argc, argv, &pciscan_cmd, &opts ) ) != 0 )
+		goto err_parse_options;
+
+	/* Parse setting name */
+	if ( ( rc = parse_autovivified_setting ( argv[optind],
+						 &setting ) ) != 0 )
+		goto err_parse_setting;
+
+	/* Determine starting bus:dev.fn address */
+	if ( ( len = fetch_uint_setting ( setting.settings, &setting.setting,
+					  &prev ) ) < 0 ) {
+		/* Setting not yet defined: start searching from 00:00.0 */
+		prev = 0;
+	} else {
+		/* Setting is defined: start searching from next location */
+		prev++;
+	}
+
+	/* Find next existent PCI device */
+	if ( ( next = pci_find_next ( &pci, prev ) ) < 0 ) {
+		rc = next;
+		goto err_find_next;
+	}
+
+	/* Apply default type if necessary.  Use ":uint16" rather than
+	 * ":busdevfn" to allow for easy inclusion within a
+	 * "${pci/${location}.x.y}" constructed setting.
+	 */
+	if ( ! setting.setting.type )
+		setting.setting.type = &setting_type_uint16;
+
+	/* Store setting */
+	if ( ( rc = storen_setting ( setting.settings, &setting.setting,
+				     next ) ) != 0 ) {
+		printf ( "Could not store \"%s\": %s\n",
+			 setting.setting.name, strerror ( rc ) );
+		goto err_store;
+	}
+
+ err_store:
+ err_find_next:
+ err_parse_setting:
+ err_parse_options:
+	return rc;
+}
+
+/** PCI commands */
+struct command pci_commands[] __command = {
+	{
+		.name = "pciscan",
+		.exec = pciscan_exec,
+	},
+};