path: root/usr/src/cmd/boot/bootadm/bootadm_hyper.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2016 Toomas Soome <tsoome@me.com>
 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <alloca.h>
#include <ctype.h>
#include <sys/types.h>

#include "bootadm.h"

#define	HYPER_KERNEL_DIR		"/platform/i86xpv/kernel"
#define	METAL_KERNEL_DIR		"/platform/i86pc/kernel"

#define	BOOTRC_FILE			"/boot/solaris/bootenv.rc"
#define	ZFS_BOOTSTR			"$ZFS-BOOTFS"

#define	BFLAG				"-B"
#define	DEFAULT_SERIAL			"9600,8,n,1"

#define	TTYXMODE_TO_COMNUM(ttyxmode)	((int)(*((ttyxmode) + 3) - '`'))
#define	COMNAME_TO_COMNUM(comname)	((int)(*((comname) + 3) - '0'))

#define	WHITESPC(x)			(x)

static char *serial_config[2] = { NULL, NULL };
static char *console_dev = NULL;

static char *bootenv_rc_serial[2] = { NULL, NULL };
static char *bootenv_rc_console = NULL;

static unsigned zfs_boot = 0;

/*
 * Append the string pointed to by "str" to the string pointed to by "orig"
 * adding the delimeter "delim" in between.
 *
 * Return a pointer to the new string or NULL, if we were passed a bad string.
 */
static char *
append_str(char *orig, char *str, char *delim)
{
	char *newstr;
	int len;

	if ((str == NULL) || (delim == NULL))
		return (NULL);

	if ((orig == NULL) || (*orig == '\0')) {
		/*
		 * Return a pointer to a copy of the path so a caller can
		 * always rely upon being able to free() a returned pointer.
		 */
		return (s_strdup(str));
	}

	len = strlen(orig) + strlen(str) + strlen(delim) + 1;
	if ((newstr = malloc(len)) == NULL) {
		bam_error(_("could not allocate memory: size = %u\n"), len);
		bam_exit(1);
	}

	(void) snprintf(newstr, len, "%s%s%s", orig, delim, str);
	return (newstr);
}

/*
 * Replace the substring "old_str" in a path with the substring "new_str"
 *
 * Return a pointer to the modified string.
 */
static char *
modify_path(char *path, char *old_str, char *new_str)
{
	char *newpath;
	char *pc;
	int len;

	/*
	 * Return a pointer to a copy of the path so a caller can always rely
	 * upon being able to free() a returned pointer.
	 */
	if ((pc = strstr(path, old_str)) == NULL)
		return (s_strdup(path));

	/*
	 * Allocate space for duplicate of path with name changes and
	 * NULL terminating byte
	 */
	len = strlen(path) - strlen(old_str) + strlen(new_str) + 1;

	if ((newpath = malloc(len)) == NULL) {
		bam_error(_("could not allocate memory: size = %u\n"), len);
		bam_exit(1);
	}

	(void) strlcpy(newpath, path, (pc - path) + 1);
	pc += strlen(old_str);

	(void) strcat(newpath, new_str);
	(void) strcat(newpath, pc);
	return (newpath);
}

/*
 * Set "token" to be the the string starting from the pointer "str" delimited
 * by any character in the string "delim" or the end of the string, but IGNORE
 * any characters between single or double quotes.
 *
 * Return a pointer to the next non-whitespace character after the delimiter
 * or NULL if we hit the end of the string. Also return NULL upon failure to
 * find any characters from the delimeter string or upon failure to allocate
 * memory for the new token string.
 */
static char *
get_token(char **token, char *str, char *delim)
{
	char *dp;
	char *start = str;
	unsigned len;

	*token = NULL;

	if ((str == NULL) || (*str == '\0'))
		return (NULL);

	do {
		if ((*str == '\'') || (*str == '"')) {
			char quote = *str++;

			while ((*str != '\0') && (*str != quote))
				str++;

			/* no matching quote found in string */
			if (*str++ == '\0')
				return (NULL);
		}

		/* look for a character from the delimiter string */
		for (dp = delim; ((*dp != '\0') && (*dp != *str)); dp++)
			;

		if (*dp != '\0') {
			len = str - start + 1;

			/* found a delimiter, so create a token string */
			if ((*token = malloc(len)) == NULL) {
				bam_error(_("could not allocate memory: "
				    "size = %u\n"), len);
				bam_exit(1);
			}

			(void) strlcpy(*token, start, len);

			while (isspace((int)*++str))
				;

			return (str);
		}
	} while (*str++ != '\0');

	/* if we hit the end of the string, the token is the whole string  */
	*token = s_strdup(start);
	return (NULL);
}

/*
 * Convert a metal "console" device name to an equivalent one suitable for
 * use with the hypervisor.
 *
 * Default to "vga" if we can't parse the console device.
 */
static void
console_metal_to_hyper(char *console)
{
	if ((*console == '\'') || (*console == '"'))
		console++;

	if (strncmp(console, "ttya", 4) == 0)
		console_dev = "console=com1";
	else if (strncmp(console, "ttyb", 4) == 0)
		console_dev = "console=com2";
	else
		console_dev = "console=vga";
}

static int
set_serial_rate(int com, char *rate)
{
	char **rp = &serial_config[com - 1];

	if ((com < 1) || (com > 2))
		return (-1);

	/*
	 * If rate is a NULL pointer, erase any existing serial configuration
	 * for this serial port.
	 */
	if (rate == NULL) {
		if (*rp != NULL) {
			free(*rp);
			*rp = NULL;
		}
		return (0);
	}

	*rp = s_realloc(*rp, strlen(rate) + 1);
	(void) strcpy(*rp, rate);
	return (0);
}

/*
 * Convert "metal" serial port parameters to values compatible with the
 * hypervisor.
 *
 * Return 0 on success, otherwise -1.
 */
static int
serial_metal_to_hyper(char *metal_port, char *metal_serial)
{
#define	COM_RATE_LEN	16	/* strlen("com1=115200,8n1") */

	char com_rate[COM_RATE_LEN];

	unsigned com, baud, bits, stop;
	char parity, handshake;

	if ((strcmp(metal_port, "ttya-mode") == 0) ||
	    (strcmp(metal_port, "ttyb-mode") == 0))
		com = TTYXMODE_TO_COMNUM(metal_port);
	else
		return (-1);

	if ((*metal_serial == '\'') || (*metal_serial == '"'))
		metal_serial++;

	/*
	 * Check if it's specified as the default rate; if so it defaults to
	 * "auto" and we need not set it for they hypervisor.
	 */
	if (strncmp(metal_serial, DEFAULT_SERIAL,
	    strlen(DEFAULT_SERIAL)) == 0) {
		(void) set_serial_rate(com, NULL);
		return (0);
	}

	/* read the serial port format as set forth in common/io/asy.c */
	if (sscanf(metal_serial, "%u,%u,%c,%u,%c", &baud, &bits, &parity, &stop,
	    &handshake) != 5)
		return (-1);

	/* validate serial port parameters */
	if (((bits < 5) || (bits > 8)) || (stop > 1) ||
	    ((parity != 'n') && (parity != 'e') && (parity != 'o')) ||
	    ((handshake != '-') && (handshake != 'h') && (handshake != 's')))
		return (-1);

	/* validate baud rate */
	switch (baud) {
		case 150:
		case 300:
		case 600:
		case 1200:
		case 2400:
		case 4800:
		case 9600:
		case 19200:
		case 38400:
		case 57600:
		case 115200:
			break;

		default:
			return (-1);
	}

	/*
	 * The hypervisor has no way to specify a handshake method, so it gets
	 * quietly dropped in the conversion.
	 */
	(void) snprintf(com_rate, COM_RATE_LEN, "com%d=%u,%u%c%u", com, baud,
	    bits, parity, stop);
	(void) set_serial_rate(com, com_rate);
	return (0);
}

/*
 * Convert "name=value" metal options to values suitable for use with the
 * hypervisor.
 *
 * Our main concerns are the console device and serial port settings.
 *
 * Return values:
 *
 *    -1:	Unparseable line
 *    0:	Success
 *    (n > 0):	A property unimportant to us
 */
static int
cvt_metal_option(char *optstr)
{
	char *value;
	unsigned namlen;

	if (strcmp(optstr, ZFS_BOOTSTR) == 0) {
		zfs_boot = 1;
		return (0);
	}

	if ((value = strchr(optstr, '=')) == NULL)
		return (-1);

	namlen = value - optstr;

	if (*++value == '\0')
		return (1);

	if (strncmp(optstr, "console", namlen) == 0) {
		console_metal_to_hyper(value);
		return (0);
	}

	if ((strncmp(optstr, "ttya-mode", namlen) == 0) ||
	    (strncmp(optstr, "ttyb-mode", namlen) == 0)) {
		char *port = strndupa(optstr, namlen);

		return (serial_metal_to_hyper(port, value));
	}

	return (1);
}

/*
 * Convert "name=value" properties for use with a bare metal kernel
 *
 * Our main concerns are the console setting and serial port modes.
 *
 * Return values:
 *
 *    -1:	Unparseable line
 *    0:	Success
 *    (n > 0):	A property unimportant to us
 */
static int
cvt_hyper_option(char *optstr)
{
#define	SER_LEN		15	/* strlen("115200,8,n,1,-") + 1 */

	char ser[SER_LEN];
	char *value;

	unsigned namlen;

	unsigned baud;
	char bits, parity, stop;

	if (strcmp(optstr, ZFS_BOOTSTR) == 0) {
		zfs_boot = 1;
		return (0);
	}

	/*
	 * If there's no "=" in the token, it's likely a standalone
	 * hypervisor token we don't care about (e.g. "noreboot" or
	 * "nosmp") so we ignore it.
	 */
	if ((value = strchr(optstr, '=')) == NULL)
		return (1);

	namlen = value - optstr;

	if (*++value == '\0')
		return (1);

	/*
	 * Note that we use strncmp against the values because the
	 * hypervisor allows setting console parameters for both the
	 * console and debugger via the format:
	 *
	 *   console=cons_dev,debug_dev
	 *
	 * and we only care about "cons_dev."
	 *
	 * This also allows us to extract "comN" from hypervisor constructs
	 * like "com1H" or "com2L," concepts unsupported on bare metal kernels.
	 *
	 * Default the console device to "text" if it was "vga" or was
	 * unparseable.
	 */
	if (strncmp(optstr, "console", namlen) == 0) {
		/* ignore the "console=hypervisor" option */
		if (strcmp(value, "hypervisor") == 0)
			return (0);

		if (strncmp(value, "com1", 4) == 0)
			console_dev = "ttya";
		else if (strncmp(value, "com2", 4) == 0)
			console_dev = "ttyb";
		else
			console_dev = "text";
	}

	/* serial port parameter conversion */

	if ((strncmp(optstr, "com1", namlen) == 0) ||
	    (strncmp(optstr, "com2", namlen) == 0)) {
		unsigned com = COMNAME_TO_COMNUM(optstr);

		/*
		 * Check if it's "auto" - if so, use the default setting
		 * of "9600,8,n,1,-".
		 *
		 * We can't just assume the serial port will default to
		 * "9600,8,n,1" as there could be a directive in bootenv.rc
		 * that would set it to some other value and we want the serial
		 * parameters to be the same as that used by the hypervisor.
		 */
		if (strcmp(value, "auto") == 0) {
			(void) snprintf(ser, SER_LEN, "9600,8,n,1,-");
		} else {
			/*
			 * Extract the "B,PS" setting from the com line; ignore
			 * other settings like io_base or IRQ.
			 */
			if (sscanf(value, "%u,%c%c%c", &baud, &bits, &parity,
			    &stop) != 4)
				return (-1);

			/* validate serial port parameters */
			if (((stop != '0') && (stop != '1')) ||
			    ((bits < '5') && (bits > '8')) ||
			    ((parity != 'n') && (parity != 'e') &&
			    (parity != 'o')))
				return (-1);

			/* validate baud rate */
			switch (baud) {
				case 150:
				case 300:
				case 600:
				case 1200:
				case 2400:
				case 4800:
				case 19200:
				case 38400:
				case 57600:
				case 115200:
					break;

				default:
					return (-1);
			}

			/*
			 * As the hypervisor has no way to denote handshaking
			 * in its serial port settings, emit a metal serial
			 * port configuration with none as well.
			 */
			(void) snprintf(ser, SER_LEN, "%u,%c,%c,%c,-", baud,
			    bits, parity, stop);
		}

		if (set_serial_rate(com, ser) != 0)
			return (-1);

		return (0);
	}

	return (1);
}

/*
 * Parse a hardware kernel's "kernel$" specifier into parameters we can then
 * use to construct an appropriate "module$" line that can be used to specify
 * how to boot the hypervisor's dom0.
 *
 * Return values:
 *
 *	-1: error parsing kernel path
 *	 0: success
 *	 1: kernel already a hypervisor kernel
 */
static int
cvt_metal_kernel(char *kernstr, char **path)
{
	char *token, *parsestr;

	parsestr = get_token(path, kernstr, " \t,");
	if (*path == NULL)
		return (-1);

	/*
	 * If the metal kernel specified contains the name of the hypervisor,
	 * we're probably trying to convert an entry already setup to run the
	 * hypervisor, so error out now.
	 */
	if (strstr(*path, XEN_MENU) != NULL) {
		bam_error(_("default entry already setup for use with the "
		    "hypervisor!\n"));
		free(*path);
		*path = NULL;
		return (1);
	}

	/* if the path was the last item on the line, that's OK. */
	if ((parsestr = get_token(&token, parsestr, " \t,")) == NULL) {
		if (token != NULL)
			free(token);
		return (0);
	}

	/* if the next token is "-B" process boot options */
	if (strncmp(token, BFLAG, strlen(BFLAG)) != 0) {
		free(token);
		return (0);
	}

	free(token);

	while ((parsestr = get_token(&token, parsestr, ",")) != NULL) {
		(void) cvt_metal_option(token);
		free(token);
	}

	if (token != NULL) {
		(void) cvt_metal_option(token);
		free(token);
	}

	return (0);
}

/*
 * Parse a hypervisor's "kernel$" line into parameters that can be used to
 * help build an appropriate "kernel$" line for booting a bare metal kernel.
 *
 * Return 0 on success, non-zero on failure.
 */
static int
cvt_hyper_kernel(char *kernel)
{
	char *token, *parsestr;

	parsestr = get_token(&token, kernel, " \t,");

	if (token == NULL)
		return (-1);

	/*
	 * If the hypervisor kernel specified lives in the metal kernel
	 * directory, we're probably trying to convert an entry already setup
	 * to run on bare metal, so error out now.
	 */
	if (strncmp(token, METAL_KERNEL_DIR, strlen(METAL_KERNEL_DIR)) == 0) {
		bam_error(_("default entry already setup for use with a metal "
		    "kernel!\n"));
		free(token);
		return (-1);
	}

	free(token);

	/* check for kernel options */
	while ((parsestr = get_token(&token, parsestr, " ")) != NULL) {
		(void) cvt_hyper_option(token);
		free(token);
	}

	if (token != NULL) {
		(void) cvt_hyper_option(token);
		free(token);
	}

	return (0);
}

/*
 * Parse a hypervisor's "module$" line into parameters that can be used to
 * help build an appropriate "kernel$" line for booting a bare metal kernel.
 */
static void
cvt_hyper_module(char *modstr, char **path)
{
	char *token = NULL;
	char *parsestr = modstr;

	/*
	 * If multiple pathnames exist on the module$ line, we just want
	 * the last one.
	 */
	while ((parsestr = get_token(path, parsestr, " \t,")) != NULL) {
		if (*parsestr != '/')
			break;
		else
			free(*path);
	}

	/* if the path was the last item on the line, that's OK. */
	if ((parsestr == NULL) ||
	    ((parsestr = get_token(&token, parsestr, " \t,")) == NULL)) {
		if (token != NULL)
			free(token);
		return;
	}

	if (token == NULL)
		return;

	/* check for "-B" option */
	if (strncmp(token, BFLAG, strlen(BFLAG)) != 0) {
		free(token);
		return;
	}

	free(token);

	/* check for kernel options */
	while ((parsestr = get_token(&token, parsestr, ",")) != NULL) {
		(void) cvt_hyper_option(token);
		free(token);
	}

	if (token != NULL) {
		(void) cvt_hyper_option(token);
		free(token);
	}
}

static void
parse_bootenvrc(char *osroot)
{
#define	LINEBUF_SZ	1024

	FILE *fp;
	char *rcpath;
	char line[LINEBUF_SZ];	/* make line buffer large but not ridiculous */
	int len;

	assert(osroot);

	len = strlen(osroot) + strlen(BOOTRC_FILE) + 1;
	rcpath = alloca(len);

	(void) snprintf(rcpath, len, "%s%s", osroot, BOOTRC_FILE);

	/* if we couldn't open the bootenv.rc file, ignore the issue. */
	if ((fp = fopen(rcpath, "r")) == NULL) {
		BAM_DPRINTF(("could not open %s: %s\n", rcpath,
		    strerror(errno)));
		return;
	}

	while (s_fgets(line, LINEBUF_SZ, fp) != NULL) {
		char *parsestr, *token;
		int port = 0;

		/* we're only interested in parsing "setprop" directives. */
		if (strncmp(line, "setprop", 7) != 0)
			continue;

		/* eat initial "setprop" */
		if ((parsestr = get_token(&token, line, " \t")) == NULL) {
			if (token != NULL)
				free(token);

			continue;
		}

		if (strcmp(token, "setprop") != 0) {
			free(token);
			continue;
		}

		free(token);

		/* get property name */
		if ((parsestr = get_token(&token, parsestr, " \t")) == NULL) {
			if (token != NULL)
				free(token);

			continue;
		}

		if (strcmp(token, "console") == 0) {
			free(token);

			/* get console property value */
			parsestr = get_token(&token, parsestr, " \t");
			if (token == NULL)
				continue;

			if (bootenv_rc_console != NULL)
				free(bootenv_rc_console);

			bootenv_rc_console = s_strdup(token);
			continue;
		}

		/* check if it's a serial port setting */
		if (strcmp(token, "ttya-mode") == 0) {
			free(token);
			port = 0;
		} else if (strcmp(token, "ttyb-mode") == 0) {
			free(token);
			port = 1;
		} else {
			/* nope, so check the next line */
			free(token);
			continue;
		}

		/* get serial port setting */
		parsestr = get_token(&token, parsestr, " \t");

		if (token == NULL)
			continue;

		if (bootenv_rc_serial[port] != NULL)
			free(bootenv_rc_serial[port]);

		bootenv_rc_serial[port] = s_strdup(token);
		free(token);
	}

	(void) fclose(fp);
}

error_t
cvt_to_hyper(menu_t *mp, char *osroot, char *extra_args)
{
	const char *fcn = "cvt_to_hyper()";

	line_t *lp;
	entry_t *ent;
	size_t len, zfslen;

	char *newstr;
	char *osdev;

	char *title = NULL;
	char *findroot = NULL;
	char *bootfs = NULL;
	char *kernel = NULL;
	char *mod_kernel = NULL;
	char *module = NULL;

	char *kern_path = NULL;
	char *kern_bargs = NULL;

	int curdef, newdef;
	int kp_allocated = 0;
	int ret = BAM_ERROR;

	assert(osroot);

	BAM_DPRINTF(("%s: entered. args: %s %s\n", fcn, osroot, extra_args));

	/*
	 * First just check to verify osroot is a sane directory.
	 */
	if ((osdev = get_special(osroot)) == NULL) {
		bam_error(_("cant find special file for mount-point %s\n"),
		    osroot);
		return (BAM_ERROR);
	}

	free(osdev);

	/*
	 * While the effect is purely cosmetic, if osroot is "/" don't
	 * bother prepending it to any paths as they are constructed to
	 * begin with "/" anyway.
	 */
	if (strcmp(osroot, "/") == 0)
		osroot = "";

	/*
	 * Found the GRUB signature on the target partitions, so now get the
	 * default GRUB boot entry number from the menu.lst file
	 */
	curdef = atoi(mp->curdefault->arg);

	/* look for the first line of the matching boot entry */
	for (ent = mp->entries; ((ent != NULL) && (ent->entryNum != curdef));
	    ent = ent->next)
		;

	/* couldn't find it, so error out */
	if (ent == NULL) {
		bam_error(_("unable to find default boot entry (%d) in "
		    "menu.lst file.\n"), curdef);
		goto abort;
	}

	/*
	 * We found the proper menu entry, so first we need to process the
	 * bootenv.rc file to look for boot options the hypervisor might need
	 * passed as kernel start options such as the console device and serial
	 * port parameters.
	 *
	 * If there's no bootenv.rc, it's not an issue.
	 */
	parse_bootenvrc(osroot);

	if (bootenv_rc_console != NULL)
		console_metal_to_hyper(bootenv_rc_console);

	if (bootenv_rc_serial[0] != NULL)
		(void) serial_metal_to_hyper("ttya-mode", bootenv_rc_serial[0]);

	if (bootenv_rc_serial[1] != NULL)
		(void) serial_metal_to_hyper("ttyb-mode", bootenv_rc_serial[1]);

	/*
	 * Now process the entry itself.
	 */
	for (lp = ent->start; lp != NULL; lp = lp->next) {
		/*
		 * Process important lines from menu.lst boot entry.
		 */
		if (lp->flags == BAM_TITLE) {
			title = strdupa(lp->arg);
		} else if (lp->cmd != NULL) {
			if (strcmp(lp->cmd, "findroot") == 0) {
				findroot = strdupa(lp->arg);
			} else if (strcmp(lp->cmd, "bootfs") == 0) {
				bootfs = strdupa(lp->arg);
			} else if (strcmp(lp->cmd,
			    menu_cmds[MODULE_DOLLAR_CMD]) == 0) {
				module = strdupa(lp->arg);
			} else if ((strcmp(lp->cmd,
			    menu_cmds[KERNEL_DOLLAR_CMD]) == 0) &&
			    (ret = cvt_metal_kernel(lp->arg,
			    &kern_path)) != 0) {
				if (ret < 0) {
					ret = BAM_ERROR;
					bam_error(_("kernel$ in default boot "
					    "entry (%d) missing or not "
					    "parseable.\n"), curdef);
				} else
					ret = BAM_NOCHANGE;

				goto abort;
			}
		}

		if (lp == ent->end)
			break;
	}

	/*
	 * If findroot, module or kern_path are NULL, the boot entry is
	 * malformed.
	 */
	if (findroot == NULL) {
		bam_error(_("findroot in default boot entry (%d) missing.\n"),
		    curdef);
		goto abort;
	}

	if (module == NULL) {
		bam_error(_("module$ in default boot entry (%d) missing or "
		    "not parseable.\n"), curdef);
		goto abort;
	}

	if (kern_path == NULL) {
		bam_error(_("kernel$ in default boot entry (%d) missing.\n"),
		    curdef);
		goto abort;
	}

	/* assemble new kernel and module arguments from parsed values */
	if (console_dev != NULL) {
		kern_bargs = s_strdup(console_dev);

		if (serial_config[0] != NULL) {
			newstr = append_str(kern_bargs, serial_config[0], " ");
			free(kern_bargs);
			kern_bargs = newstr;
		}

		if (serial_config[1] != NULL) {
			newstr = append_str(kern_bargs, serial_config[1], " ");
			free(kern_bargs);
			kern_bargs = newstr;
		}
	}

	if ((extra_args != NULL) && (*extra_args != '\0')) {
		newstr = append_str(kern_bargs, extra_args, " ");
		free(kern_bargs);
		kern_bargs = newstr;
	}

	len = strlen(osroot) + strlen(XEN_MENU) + strlen(kern_bargs) +
	    WHITESPC(1) + 1;

	kernel = alloca(len);

	if (kern_bargs != NULL) {
		if (*kern_bargs != '\0')
			(void) snprintf(kernel, len, "%s%s %s", osroot,
			    XEN_MENU, kern_bargs);

		free(kern_bargs);
	} else {
		(void) snprintf(kernel, len, "%s%s", osroot, XEN_MENU);
	}

	/*
	 * Change the kernel directory from the metal version to that needed for
	 * the hypervisor.  Convert either "direct boot" path to the default
	 * path.
	 */
	if ((strcmp(kern_path, DIRECT_BOOT_32) == 0) ||
	    (strcmp(kern_path, DIRECT_BOOT_64) == 0)) {
		kern_path = HYPERVISOR_KERNEL;
	} else {
		newstr = modify_path(kern_path, METAL_KERNEL_DIR,
		    HYPER_KERNEL_DIR);
		free(kern_path);
		kern_path = newstr;
		kp_allocated = 1;
	}

	/*
	 * We need to allocate space for the kernel path (twice) plus an
	 * intervening space, possibly the ZFS boot string, and NULL,
	 * of course.
	 */
	len = (strlen(kern_path) * 2) + WHITESPC(1) + 1;
	zfslen = (zfs_boot ? (WHITESPC(1) + strlen(ZFS_BOOT)) : 0);

	mod_kernel = alloca(len + zfslen);
	(void) snprintf(mod_kernel, len, "%s %s", kern_path, kern_path);

	if (kp_allocated)
		free(kern_path);

	if (zfs_boot) {
		char *zfsstr = alloca(zfslen + 1);

		(void) snprintf(zfsstr, zfslen + 1, " %s", ZFS_BOOT);
		(void) strcat(mod_kernel, zfsstr);
	}

	/* shut off warning messages from the entry line parser */
	if (ent->flags & BAM_ENTRY_BOOTADM)
		ent->flags &= ~BAM_ENTRY_BOOTADM;

	BAM_DPRINTF(("%s: converted kernel cmd to %s\n", fcn, kernel));
	BAM_DPRINTF(("%s: converted module cmd to %s\n", fcn, mod_kernel));

	if ((newdef = add_boot_entry(mp, title, findroot, kernel, mod_kernel,
	    module, bootfs)) == BAM_ERROR)
		return (newdef);

	/*
	 * Now try to delete the current default entry from the menu and add
	 * the new hypervisor entry with the parameters we've setup.
	 */
	if (delete_boot_entry(mp, curdef, DBE_QUIET) == BAM_SUCCESS)
		newdef--;
	else
		bam_print(_("unable to modify default entry; creating new "
		    "boot entry for %s\n"), title);

	/*
	 * If we successfully created the new entry, set the default boot
	 * entry to that entry and let the caller know the new menu should
	 * be written out.
	 */
	return (set_global(mp, menu_cmds[DEFAULT_CMD], newdef));

abort:
	if (ret != BAM_NOCHANGE)
		bam_error(_("error converting GRUB menu entry on %s for use "
		    "with the hypervisor.\nAborting.\n"),
		    ((*osroot == '\0') ? "/" : osroot));

	return (ret);
}

/*ARGSUSED*/
error_t
cvt_to_metal(menu_t *mp, char *osroot, char *menu_root)
{
	const char *fcn = "cvt_to_metal()";

	line_t *lp;
	entry_t *ent;
	size_t len, zfslen;

	char *delim = ",";
	char *newstr;
	char *osdev;

	char *title = NULL;
	char *findroot = NULL;
	char *bootfs = NULL;
	char *kernel = NULL;
	char *module = NULL;

	char *barchive_path = DIRECT_BOOT_ARCHIVE;
	char *kern_path = NULL;

	int curdef, newdef;
	int emit_bflag = 1;
	int ret = BAM_ERROR;

	assert(osroot);

	BAM_DPRINTF(("%s: entered. args: %s %s\n", fcn, osroot, ""));

	/*
	 * First just check to verify osroot is a sane directory.
	 */
	if ((osdev = get_special(osroot)) == NULL) {
		bam_error(_("cant find special file for mount-point %s\n"),
		    osroot);
		return (BAM_ERROR);
	}

	free(osdev);

	/*
	 * Found the GRUB signature on the target partitions, so now get the
	 * default GRUB boot entry number from the menu.lst file
	 */
	curdef = atoi(mp->curdefault->arg);

	/* look for the first line of the matching boot entry */
	for (ent = mp->entries; ((ent != NULL) && (ent->entryNum != curdef));
	    ent = ent->next)
		;

	/* couldn't find it, so error out */
	if (ent == NULL) {
		bam_error(_("unable to find default boot entry (%d) in "
		    "menu.lst file.\n"), curdef);
		goto abort;
	}

	/*
	 * Now process the entry itself.
	 */
	for (lp = ent->start; lp != NULL; lp = lp->next) {
		/*
		 * Process important lines from menu.lst boot entry.
		 */
		if (lp->flags == BAM_TITLE) {
			title = strdupa(lp->arg);
		} else if (lp->cmd != NULL) {
			if (strcmp(lp->cmd, "findroot") == 0) {
				findroot = strdupa(lp->arg);
			} else if (strcmp(lp->cmd, "bootfs") == 0) {
				bootfs = strdupa(lp->arg);
			} else if (strcmp(lp->cmd,
			    menu_cmds[MODULE_DOLLAR_CMD]) == 0) {
				if (strstr(lp->arg, "boot_archive") == NULL) {
					module = strdupa(lp->arg);
					cvt_hyper_module(module, &kern_path);
				} else {
					barchive_path = strdupa(lp->arg);
				}
			} else if ((strcmp(lp->cmd,
			    menu_cmds[KERNEL_DOLLAR_CMD]) == 0) &&
			    (cvt_hyper_kernel(lp->arg) < 0)) {
				ret = BAM_NOCHANGE;
				goto abort;
			}
		}

		if (lp == ent->end)
			break;
	}

	/*
	 * If findroot, module or kern_path are NULL, the boot entry is
	 * malformed.
	 */
	if (findroot == NULL) {
		bam_error(_("findroot in default boot entry (%d) missing.\n"),
		    curdef);
		goto abort;
	}

	if (module == NULL) {
		bam_error(_("module$ in default boot entry (%d) missing or "
		    "not parseable.\n"), curdef);
		goto abort;
	}

	if (kern_path == NULL) {
		bam_error(_("kernel$ in default boot entry (%d) missing.\n"),
		    curdef);
		goto abort;
	}

	/*
	 * Assemble new kernel and module arguments from parsed values.
	 *
	 * First, change the kernel directory from the hypervisor version to
	 * that needed for a metal kernel.
	 */
	newstr = modify_path(kern_path, HYPER_KERNEL_DIR, METAL_KERNEL_DIR);
	free(kern_path);
	kern_path = newstr;

	/* allocate initial space for the kernel path */
	len = strlen(kern_path) + 1;
	zfslen = (zfs_boot ? (WHITESPC(1) + strlen(ZFS_BOOT)) : 0);

	if ((kernel = malloc(len + zfslen)) == NULL) {
		free(kern_path);
		bam_error(_("could not allocate memory: size = %u\n"),
		    len + zfslen);
		bam_exit(1);
	}

	(void) snprintf(kernel, len, "%s", kern_path);
	free(kern_path);

	if (zfs_boot) {
		char *zfsstr = alloca(zfslen + 1);

		(void) snprintf(zfsstr, zfslen + 1, " %s", ZFS_BOOT);
		(void) strcat(kernel, zfsstr);
		emit_bflag = 0;
	}

	/*
	 * Process the bootenv.rc file to look for boot options that would be
	 * the same as what the hypervisor had manually set, as we need not set
	 * those explicitly.
	 *
	 * If there's no bootenv.rc, it's not an issue.
	 */
	parse_bootenvrc(osroot);

	/*
	 * Don't emit a console setting if it's the same as what would be
	 * set by bootenv.rc.
	 */
	if ((console_dev != NULL) && (bootenv_rc_console == NULL ||
	    (strcmp(console_dev, bootenv_rc_console) != 0))) {
		if (emit_bflag) {
			newstr = append_str(kernel, BFLAG, " ");
			free(kernel);
			kernel = append_str(newstr, "console=", " ");
			free(newstr);
			newstr = append_str(kernel, console_dev, "");
			free(kernel);
			kernel = newstr;
			emit_bflag = 0;
		} else {
			newstr = append_str(kernel, "console=", ",");
			free(kernel);
			kernel = append_str(newstr, console_dev, "");
			free(newstr);
		}
	}

	/*
	 * We have to do some strange processing here because the hypervisor's
	 * serial ports default to "9600,8,n,1,-" if "comX=auto" is specified,
	 * or to "auto" if nothing is specified.
	 *
	 * This could result in a serial mode setting string being added when
	 * it would otherwise not be needed, but it's better to play it safe.
	 */
	if (emit_bflag) {
		newstr = append_str(kernel, BFLAG, " ");
		free(kernel);
		kernel = newstr;
		delim = " ";
		emit_bflag = 0;
	}

	if ((serial_config[0] != NULL) && (bootenv_rc_serial[0] == NULL ||
	    (strcmp(serial_config[0], bootenv_rc_serial[0]) != 0))) {
		newstr = append_str(kernel, "ttya-mode='", delim);
		free(kernel);

		/*
		 * Pass the serial configuration as the delimiter to
		 * append_str() as it will be inserted between the current
		 * string and the string we're appending, in this case the
		 * closing single quote.
		 */
		kernel = append_str(newstr, "'", serial_config[0]);
		free(newstr);
		delim = ",";
	}

	if ((serial_config[1] != NULL) && (bootenv_rc_serial[1] == NULL ||
	    (strcmp(serial_config[1], bootenv_rc_serial[1]) != 0))) {
		newstr = append_str(kernel, "ttyb-mode='", delim);
		free(kernel);

		/*
		 * Pass the serial configuration as the delimiter to
		 * append_str() as it will be inserted between the current
		 * string and the string we're appending, in this case the
		 * closing single quote.
		 */
		kernel = append_str(newstr, "'", serial_config[1]);
		free(newstr);
		delim = ",";
	}

	/* shut off warning messages from the entry line parser */
	if (ent->flags & BAM_ENTRY_BOOTADM)
		ent->flags &= ~BAM_ENTRY_BOOTADM;

	BAM_DPRINTF(("%s: converted kernel cmd to %s\n", fcn, kernel));
	BAM_DPRINTF(("%s: converted module cmd to %s\n", fcn, module));

	if ((newdef = add_boot_entry(mp, title, findroot, kernel, NULL,
	    barchive_path, bootfs)) == BAM_ERROR) {
		free(kernel);
		return (newdef);
	}

	/*
	 * Now try to delete the current default entry from the menu and add
	 * the new hypervisor entry with the parameters we've setup.
	 */
	if (delete_boot_entry(mp, curdef, DBE_QUIET) == BAM_SUCCESS)
		newdef--;
	else
		bam_print(_("unable to modify default entry; creating new "
		    "boot entry for %s\n"), title);

	free(kernel);

	/*
	 * If we successfully created the new entry, set the default boot
	 * entry to that entry and let the caller know the new menu should
	 * be written out.
	 */
	return (set_global(mp, menu_cmds[DEFAULT_CMD], newdef));

abort:
	if (ret != BAM_NOCHANGE)
		bam_error(_("error converting GRUB menu entry on %s for use "
		    "with a metal kernel.\nAborting.\n"), osroot);

	return (ret);
}