24 files changed, 3243 insertions, 0 deletions

diff --git a/stand/userboot/Makefile b/stand/userboot/Makefile
new file mode 100644
index 000000000000..0a53a217dc15
--- /dev/null
+++ b/stand/userboot/Makefile
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+.include <bsd.own.mk>
+
+SUBDIR=		test userboot
+
+.include <bsd.subdir.mk>
+
diff --git a/stand/userboot/Makefile.inc b/stand/userboot/Makefile.inc
new file mode 100644
index 000000000000..265f86d1ed55
--- /dev/null
+++ b/stand/userboot/Makefile.inc
@@ -0,0 +1,3 @@
+# $FreeBSD$
+
+.include "../Makefile.inc"
diff --git a/stand/userboot/test/Makefile b/stand/userboot/test/Makefile
new file mode 100644
index 000000000000..1bc66798aac8
--- /dev/null
+++ b/stand/userboot/test/Makefile
@@ -0,0 +1,14 @@
+# $FreeBSD$
+
+
+MAN=
+
+.include <bsd.init.mk>
+MK_SSP=		no
+
+PROG=		test
+INTERNALPROG=
+
+CFLAGS+=	-I${BOOTSRC}/userboot
+
+.include <bsd.prog.mk>
diff --git a/stand/userboot/test/Makefile.depend b/stand/userboot/test/Makefile.depend
new file mode 100644
index 000000000000..6cfaab1c3644
--- /dev/null
+++ b/stand/userboot/test/Makefile.depend
@@ -0,0 +1,17 @@
+# $FreeBSD$
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+	gnu/lib/csu \
+	include \
+	include/xlocale \
+	lib/${CSU_DIR} \
+	lib/libc \
+	lib/libcompiler_rt \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif
diff --git a/stand/userboot/test/test.c b/stand/userboot/test/test.c
new file mode 100644
index 000000000000..bacde565ec3b
--- /dev/null
+++ b/stand/userboot/test/test.c
@@ -0,0 +1,475 @@
+/*-
+ * Copyright (c) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/disk.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <dlfcn.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include <userboot.h>
+
+char *host_base = NULL;
+struct termios term, oldterm;
+char *image;
+size_t image_size;
+int disk_fd = -1;
+
+uint64_t regs[16];
+uint64_t pc;
+
+void test_exit(void *arg, int v);
+
+/*
+ * Console i/o
+ */
+
+void
+test_putc(void *arg, int ch)
+{
+	char c = ch;
+
+	write(1, &c, 1);
+}
+
+int
+test_getc(void *arg)
+{
+	char c;
+
+	if (read(0, &c, 1) == 1)
+		return c;
+	return -1;
+}
+
+int
+test_poll(void *arg)
+{
+	int n;
+
+	if (ioctl(0, FIONREAD, &n) >= 0)
+		return (n > 0);
+	return (0);
+}
+
+/*
+ * Host filesystem i/o
+ */
+
+struct test_file {
+	int tf_isdir;
+	size_t tf_size;
+	struct stat tf_stat;
+	union {
+		int fd;
+		DIR *dir;
+	} tf_u;
+};
+
+int
+test_open(void *arg, const char *filename, void **h_return)
+{
+	struct stat st;
+	struct test_file *tf;
+	char path[PATH_MAX];
+
+	if (!host_base)
+		return (ENOENT);
+
+	strlcpy(path, host_base, PATH_MAX);
+	if (path[strlen(path) - 1] == '/')
+		path[strlen(path) - 1] = 0;
+	strlcat(path, filename, PATH_MAX);
+	tf = malloc(sizeof(struct test_file));
+	if (stat(path, &tf->tf_stat) < 0) {
+		free(tf);
+		return (errno);
+	}
+
+	tf->tf_size = st.st_size;
+	if (S_ISDIR(tf->tf_stat.st_mode)) {
+		tf->tf_isdir = 1;
+		tf->tf_u.dir = opendir(path);
+		if (!tf->tf_u.dir)
+			goto out;
+                *h_return = tf;
+		return (0);
+	}
+	if (S_ISREG(tf->tf_stat.st_mode)) {
+		tf->tf_isdir = 0;
+		tf->tf_u.fd = open(path, O_RDONLY);
+		if (tf->tf_u.fd < 0)
+			goto out;
+                *h_return = tf;
+		return (0);
+	}
+
+out:
+	free(tf);
+	return (EINVAL);
+}
+
+int
+test_close(void *arg, void *h)
+{
+	struct test_file *tf = h;
+
+	if (tf->tf_isdir)
+		closedir(tf->tf_u.dir);
+	else
+		close(tf->tf_u.fd);
+	free(tf);
+
+	return (0);
+}
+
+int
+test_isdir(void *arg, void *h)
+{
+	struct test_file *tf = h;
+
+	return (tf->tf_isdir);
+}
+
+int
+test_read(void *arg, void *h, void *dst, size_t size, size_t *resid_return)
+{
+	struct test_file *tf = h;
+	ssize_t sz;
+
+	if (tf->tf_isdir)
+		return (EINVAL);
+	sz = read(tf->tf_u.fd, dst, size);
+	if (sz < 0)
+		return (EINVAL);
+	*resid_return = size - sz;
+	return (0);
+}
+
+int
+test_readdir(void *arg, void *h, uint32_t *fileno_return, uint8_t *type_return,
+    size_t *namelen_return, char *name)
+{
+	struct test_file *tf = h;
+	struct dirent *dp;
+
+	if (!tf->tf_isdir)
+		return (EINVAL);
+
+	dp = readdir(tf->tf_u.dir);
+	if (!dp)
+		return (ENOENT);
+
+	/*
+	 * Note: d_namlen is in the range 0..255 and therefore less
+	 * than PATH_MAX so we don't need to test before copying.
+	 */
+	*fileno_return = dp->d_fileno;
+	*type_return = dp->d_type;
+	*namelen_return = dp->d_namlen;
+	memcpy(name, dp->d_name, dp->d_namlen);
+	name[dp->d_namlen] = 0;
+
+	return (0);
+}
+
+int
+test_seek(void *arg, void *h, uint64_t offset, int whence)
+{
+	struct test_file *tf = h;
+
+	if (tf->tf_isdir)
+		return (EINVAL);
+	if (lseek(tf->tf_u.fd, offset, whence) < 0)
+		return (errno);
+	return (0);
+}
+
+int
+test_stat(void *arg, void *h, int *mode_return, int *uid_return, int *gid_return,
+    uint64_t *size_return)
+{
+	struct test_file *tf = h;
+
+	*mode_return = tf->tf_stat.st_mode;
+	*uid_return = tf->tf_stat.st_uid;
+	*gid_return = tf->tf_stat.st_gid;
+	*size_return = tf->tf_stat.st_size;
+	return (0);
+}
+
+/*
+ * Disk image i/o
+ */
+
+int
+test_diskread(void *arg, int unit, uint64_t offset, void *dst, size_t size,
+    size_t *resid_return)
+{
+	ssize_t n;
+
+	if (unit != 0 || disk_fd == -1)
+		return (EIO);
+	n = pread(disk_fd, dst, size, offset);
+	if (n < 0)
+		return (errno);
+	*resid_return = size - n;
+	return (0);
+}
+
+int
+test_diskioctl(void *arg, int unit, u_long cmd, void *data)
+{
+	struct stat sb;
+
+	if (unit != 0 || disk_fd == -1)
+		return (EBADF);
+	switch (cmd) {
+	case DIOCGSECTORSIZE:
+		*(u_int *)data = 512;
+		break;
+	case DIOCGMEDIASIZE:
+		if (fstat(disk_fd, &sb) == 0)
+			*(off_t *)data = sb.st_size;
+		else
+			return (ENOTTY);
+		break;
+	default:
+		return (ENOTTY);
+	}
+	return (0);
+}
+
+/*
+ * Guest virtual machine i/o
+ *
+ * Note: guest addresses are kernel virtual
+ */
+
+int
+test_copyin(void *arg, const void *from, uint64_t to, size_t size)
+{
+
+	to &= 0x7fffffff;
+	if (to > image_size)
+		return (EFAULT);
+	if (to + size > image_size)
+		size = image_size - to;
+	memcpy(&image[to], from, size);
+	return(0);
+}
+
+int
+test_copyout(void *arg, uint64_t from, void *to, size_t size)
+{
+
+	from &= 0x7fffffff;
+	if (from > image_size)
+		return (EFAULT);
+	if (from + size > image_size)
+		size = image_size - from;
+	memcpy(to, &image[from], size);
+	return(0);
+}
+
+void
+test_setreg(void *arg, int r, uint64_t v)
+{
+
+	if (r < 0 || r >= 16)
+		return;
+	regs[r] = v;
+}
+
+void
+test_setmsr(void *arg, int r, uint64_t v)
+{
+}
+
+void
+test_setcr(void *arg, int r, uint64_t v)
+{
+}
+
+void
+test_setgdt(void *arg, uint64_t v, size_t sz)
+{
+}
+
+void
+test_exec(void *arg, uint64_t pc)
+{
+	printf("Execute at 0x%"PRIu64"\n", pc);
+	test_exit(arg, 0);
+}
+
+/*
+ * Misc
+ */
+
+void
+test_delay(void *arg, int usec)
+{
+
+	usleep(usec);
+}
+
+void
+test_exit(void *arg, int v)
+{
+
+	tcsetattr(0, TCSAFLUSH, &oldterm);
+	exit(v);
+}
+
+void
+test_getmem(void *arg, uint64_t *lowmem, uint64_t *highmem)
+{
+
+        *lowmem = 128*1024*1024;
+        *highmem = 0;
+}
+
+const char *
+test_getenv(void *arg, int idx)
+{
+	static const char *vars[] = {
+		"foo=bar",
+		"bar=barbar",
+		NULL
+	};
+
+	return (vars[idx]);
+}
+
+struct loader_callbacks cb = {
+	.putc = test_putc,
+	.getc = test_getc,
+	.poll = test_poll,
+
+	.open = test_open,
+	.close = test_close,
+	.isdir = test_isdir,
+	.read = test_read,
+	.readdir = test_readdir,
+	.seek = test_seek,
+	.stat = test_stat,
+
+	.diskread = test_diskread,
+	.diskioctl = test_diskioctl,
+
+	.copyin = test_copyin,
+	.copyout = test_copyout,
+	.setreg = test_setreg,
+	.setmsr = test_setmsr,
+	.setcr = test_setcr,
+        .setgdt = test_setgdt,
+	.exec = test_exec,
+
+	.delay = test_delay,
+	.exit = test_exit,
+        .getmem = test_getmem,
+
+	.getenv = test_getenv,
+};
+
+void
+usage()
+{
+
+	printf("usage: [-b <userboot shared object>] [-d <disk image path>] [-h <host filesystem path>\n");
+	exit(1);
+}
+
+int
+main(int argc, char** argv)
+{
+	void *h;
+	void (*func)(struct loader_callbacks *, void *, int, int);
+	int opt;
+	char *disk_image = NULL;
+	const char *userboot_obj = "/boot/userboot.so";
+
+	while ((opt = getopt(argc, argv, "b:d:h:")) != -1) {
+		switch (opt) {
+		case 'b':
+			userboot_obj = optarg;
+			break;
+
+		case 'd':
+			disk_image = optarg;
+			break;
+
+		case 'h':
+			host_base = optarg;
+			break;
+
+		case '?':
+			usage();
+		}
+	}
+
+	h = dlopen(userboot_obj, RTLD_LOCAL);
+	if (!h) {
+		printf("%s\n", dlerror());
+		return (1);
+	}
+	func = dlsym(h, "loader_main");
+	if (!func) {
+		printf("%s\n", dlerror());
+		return (1);
+	}
+
+	image_size = 128*1024*1024;
+	image = malloc(image_size);
+	if (disk_image) {
+		disk_fd = open(disk_image, O_RDONLY);
+		if (disk_fd < 0)
+			err(1, "Can't open disk image '%s'", disk_image);
+	}
+
+	tcgetattr(0, &term);
+	oldterm = term;
+	term.c_iflag &= ~(ICRNL);
+	term.c_lflag &= ~(ICANON|ECHO);
+	tcsetattr(0, TCSAFLUSH, &term);
+
+	func(&cb, NULL, USERBOOT_VERSION_3, disk_fd >= 0);
+}
diff --git a/stand/userboot/userboot.h b/stand/userboot/userboot.h
new file mode 100644
index 000000000000..7ffb06f652aa
--- /dev/null
+++ b/stand/userboot/userboot.h
@@ -0,0 +1,213 @@
+/*-
+ * Copyright (c) 2011 Doug Rabson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * USERBOOT interface versions
+ */
+#define	USERBOOT_VERSION_1      1
+#define	USERBOOT_VERSION_2      2
+#define	USERBOOT_VERSION_3      3
+
+/*
+ * Version 4 added more generic callbacks for setting up
+ * registers and descriptors. The callback structure is
+ * backward compatible (new callbacks have been added at
+ * the tail end).
+ */
+#define	USERBOOT_VERSION_4      4
+
+/*
+ * Exit codes from the loader
+ */
+#define	USERBOOT_EXIT_QUIT      1
+#define	USERBOOT_EXIT_REBOOT    2
+
+struct loader_callbacks {
+	/*
+	 * Console i/o
+	 */
+
+        /*
+         * Wait until a key is pressed on the console and then return it
+         */
+	int		(*getc)(void *arg);
+
+        /*
+         * Write the character ch to the console
+         */
+	void		(*putc)(void *arg, int ch);
+
+        /*
+         * Return non-zero if a key can be read from the console
+         */
+	int		(*poll)(void *arg);
+
+	/*
+	 * Host filesystem i/o
+	 */
+
+        /*
+         * Open a file in the host filesystem
+         */
+	int		(*open)(void *arg, const char *filename, void **h_return);
+
+        /*
+         * Close a file
+         */
+	int		(*close)(void *arg, void *h);
+
+        /*
+         * Return non-zero if the file is a directory
+         */
+	int		(*isdir)(void *arg, void *h);
+
+        /*
+         * Read size bytes from a file. The number of bytes remaining
+         * in dst after reading is returned in *resid_return
+         */
+	int		(*read)(void *arg, void *h, void *dst, size_t size,
+            size_t *resid_return);
+
+        /*
+         * Read an entry from a directory. The entry's inode number is
+         * returned in *fileno_return, its type in *type_return and
+         * the name length in *namelen_return. The name itself is
+         * copied to the buffer name which must be at least PATH_MAX
+         * in size.
+         */
+	int		(*readdir)(void *arg, void *h, uint32_t *fileno_return,
+            uint8_t *type_return, size_t *namelen_return, char *name);
+
+        /*
+         * Seek to a location within an open file
+         */
+	int		(*seek)(void *arg, void *h, uint64_t offset,
+            int whence);
+
+        /*
+         * Return some stat(2) related information about the file
+         */
+	int		(*stat)(void *arg, void *h, int *mode_return,
+            int *uid_return, int *gid_return, uint64_t *size_return);
+
+	/*
+	 * Disk image i/o
+	 */
+
+        /*
+         * Read from a disk image at the given offset
+         */
+	int		(*diskread)(void *arg, int unit, uint64_t offset,
+            void *dst, size_t size, size_t *resid_return);
+
+	/*
+	 * Guest virtual machine i/o
+	 */
+
+        /*
+         * Copy to the guest address space
+         */
+	int		(*copyin)(void *arg, const void *from,
+            uint64_t to, size_t size);
+
+        /*
+         * Copy from the guest address space
+         */
+	int		(*copyout)(void *arg, uint64_t from,
+            void *to, size_t size);
+
+        /*
+         * Set a guest register value
+         */
+	void		(*setreg)(void *arg, int, uint64_t);
+
+        /*
+         * Set a guest MSR value
+         */
+	void		(*setmsr)(void *arg, int, uint64_t);
+
+        /*
+         * Set a guest CR value
+         */
+	void		(*setcr)(void *arg, int, uint64_t);
+
+        /*
+         * Set the guest GDT address
+         */
+        void            (*setgdt)(void *arg, uint64_t, size_t);
+
+        /*
+         * Transfer control to the guest at the given address
+         */
+	void		(*exec)(void *arg, uint64_t pc);
+
+	/*
+	 * Misc
+	 */
+
+        /*
+         * Sleep for usec microseconds
+         */
+	void		(*delay)(void *arg, int usec);
+
+        /*
+         * Exit with the given exit code
+         */
+	void		(*exit)(void *arg, int v);
+
+        /*
+         * Return guest physical memory map details
+         */
+	void		(*getmem)(void *arg, uint64_t *lowmem,
+            uint64_t *highmem);
+
+	/*
+	 * ioctl interface to the disk device
+	 */
+	int		(*diskioctl)(void *arg, int unit, u_long cmd,
+	    void *data);
+
+	/*
+	 * Returns an environment variable in the form "name=value".
+	 *
+	 * If there are no more variables that need to be set in the
+	 * loader environment then return NULL.
+	 *
+	 * 'num' is used as a handle for the callback to identify which
+	 * environment variable to return next. It will begin at 0 and
+	 * each invocation will add 1 to the previous value of 'num'.
+	 */
+	const char *	(*getenv)(void *arg, int num);
+
+	/*
+	 * Version 4 additions.
+	 */
+	int	(*vm_set_register)(void *arg, int vcpu, int reg, uint64_t val);
+	int	(*vm_set_desc)(void *arg, int vcpu, int reg, uint64_t base,
+	    u_int limit, u_int access);
+};
diff --git a/stand/userboot/userboot/Makefile b/stand/userboot/userboot/Makefile
new file mode 100644
index 000000000000..cbada8227ba0
--- /dev/null
+++ b/stand/userboot/userboot/Makefile
@@ -0,0 +1,59 @@
+# $FreeBSD$
+
+MAN=
+
+LOADER_MSDOS_SUPPORT?=	yes
+LOADER_UFS_SUPPORT?=	yes
+LOADER_CD9660_SUPPORT?=	no
+LOADER_EXT2FS_SUPPORT?=	no
+
+.include <bsd.init.mk>
+
+MK_SSP=		no
+
+SHLIB_NAME=	userboot.so
+MK_CTF=		no
+STRIP=
+LIBDIR=		/boot
+
+SRCS=		autoload.c
+SRCS+=		bcache.c
+SRCS+=		biossmap.c
+SRCS+=		bootinfo.c
+SRCS+=		bootinfo32.c
+SRCS+=		bootinfo64.c
+SRCS+=		conf.c
+SRCS+=		console.c
+SRCS+=		copy.c
+SRCS+=		devicename.c
+SRCS+=		elf32_freebsd.c
+SRCS+=		elf64_freebsd.c
+SRCS+=		host.c
+SRCS+=		main.c
+SRCS+=		userboot_cons.c
+SRCS+=		userboot_disk.c
+SRCS+=		vers.c
+
+CFLAGS+=	-Wall
+CFLAGS+=	-I${BOOTSRC}/userboot
+CFLAGS+=	-ffreestanding
+
+CWARNFLAGS.main.c += -Wno-implicit-function-declaration
+
+LDFLAGS+=	-nostdlib -Wl,-Bsymbolic
+
+NEWVERSWHAT=	"User boot" ${MACHINE_CPUARCH}
+
+.if ${MK_ZFS} != "no"
+CFLAGS+=	-DUSERBOOT_ZFS_SUPPORT
+LIBZFSBOOT=	${BOOTOBJ}/zfs/libzfsboot.a
+.endif
+
+# Always add MI sources 
+HELP_FILES=	# Disable
+.include	"${BOOTSRC}/loader.mk"
+CFLAGS+=	-I.
+DPADD+=		${LIBFICL} ${LIBZFSBOOT} ${LIBSA} 
+LDADD+=		${LIBFICL} ${LIBZFSBOOT} ${LIBSA}
+
+.include <bsd.lib.mk>
diff --git a/stand/userboot/userboot/Makefile.depend b/stand/userboot/userboot/Makefile.depend
new file mode 100644
index 000000000000..87e0acc0f3b5
--- /dev/null
+++ b/stand/userboot/userboot/Makefile.depend
@@ -0,0 +1,16 @@
+# $FreeBSD$
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+	include \
+	include/xlocale \
+	stand/ficl \
+	stand/libsa \
+	stand/zfs \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif
diff --git a/stand/userboot/userboot/autoload.c b/stand/userboot/userboot/autoload.c
new file mode 100644
index 000000000000..a86afcfa2b4b
--- /dev/null
+++ b/stand/userboot/userboot/autoload.c
@@ -0,0 +1,35 @@
+/*-
+ * Copyright (c) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+int
+userboot_autoload(void)
+{
+
+	return (0);
+}
diff --git a/stand/userboot/userboot/biossmap.c b/stand/userboot/userboot/biossmap.c
new file mode 100644
index 000000000000..9e556be373cc
--- /dev/null
+++ b/stand/userboot/userboot/biossmap.c
@@ -0,0 +1,74 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <sys/param.h>
+#include <sys/reboot.h>
+#include <sys/linker.h>
+#include <machine/pc/bios.h>
+#include <machine/metadata.h>
+
+#include "bootstrap.h"
+#include "libuserboot.h"
+
+#define GB (1024UL * 1024 * 1024)
+
+void
+bios_addsmapdata(struct preloaded_file *kfp)
+{
+	uint64_t lowmem, highmem;
+	int smapnum, len;
+	struct bios_smap smap[3], *sm;
+
+	CALLBACK(getmem, &lowmem, &highmem);
+
+	sm = &smap[0];
+
+	sm->base = 0;				/* base memory */
+	sm->length = 640 * 1024;
+	sm->type = SMAP_TYPE_MEMORY;
+	sm++;
+
+	sm->base = 0x100000;			/* extended memory */
+	sm->length = lowmem - 0x100000;
+	sm->type = SMAP_TYPE_MEMORY;
+	sm++;
+
+	smapnum = 2;
+
+        if (highmem != 0) {
+                sm->base = 4 * GB;
+                sm->length = highmem;
+                sm->type = SMAP_TYPE_MEMORY;
+		smapnum++;
+        }
+
+        len = smapnum * sizeof(struct bios_smap);
+        file_addmetadata(kfp, MODINFOMD_SMAP, len, &smap[0]);
+}
diff --git a/stand/userboot/userboot/bootinfo.c b/stand/userboot/userboot/bootinfo.c
new file mode 100644
index 000000000000..289ca071fe89
--- /dev/null
+++ b/stand/userboot/userboot/bootinfo.c
@@ -0,0 +1,170 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <sys/param.h>
+#include <sys/reboot.h>
+#include <sys/linker.h>
+#include <sys/boot.h>
+
+#include "bootstrap.h"
+#include "libuserboot.h"
+
+int
+bi_getboothowto(char *kargs)
+{
+    char	*cp;
+    char	*curpos, *next, *string;
+    int		howto;
+    int		active;
+    int		i;
+    int		vidconsole;
+
+    /* Parse kargs */
+    howto = 0;
+    if (kargs  != NULL) {
+	cp = kargs;
+	active = 0;
+	while (*cp != 0) {
+	    if (!active && (*cp == '-')) {
+		active = 1;
+	    } else if (active)
+		switch (*cp) {
+		case 'a':
+		    howto |= RB_ASKNAME;
+		    break;
+		case 'C':
+		    howto |= RB_CDROM;
+		    break;
+		case 'd':
+		    howto |= RB_KDB;
+		    break;
+		case 'D':
+		    howto |= RB_MULTIPLE;
+		    break;
+		case 'm':
+		    howto |= RB_MUTE;
+		    break;
+		case 'g':
+		    howto |= RB_GDB;
+		    break;
+		case 'h':
+		    howto |= RB_SERIAL;
+		    break;
+		case 'p':
+		    howto |= RB_PAUSE;
+		    break;
+		case 'r':
+		    howto |= RB_DFLTROOT;
+		    break;
+		case 's':
+		    howto |= RB_SINGLE;
+		    break;
+		case 'v':
+		    howto |= RB_VERBOSE;
+		    break;
+		default:
+		    active = 0;
+		    break;
+		}
+	    cp++;
+	}
+    }
+    /* get equivalents from the environment */
+    for (i = 0; howto_names[i].ev != NULL; i++)
+	if (getenv(howto_names[i].ev) != NULL)
+	    howto |= howto_names[i].mask;
+
+    /* Enable selected consoles */
+    string = next = strdup(getenv("console"));
+    vidconsole = 0;
+    while (next != NULL) {
+	curpos = strsep(&next, " ,");
+	if (*curpos == '\0')
+		continue;
+	if (!strcmp(curpos, "vidconsole"))
+	    vidconsole = 1;
+	else if (!strcmp(curpos, "comconsole"))
+	    howto |= RB_SERIAL;
+	else if (!strcmp(curpos, "nullconsole"))
+	    howto |= RB_MUTE;
+    }
+
+    if (vidconsole && (howto & RB_SERIAL))
+	howto |= RB_MULTIPLE;
+
+    /*
+     * XXX: Note that until the kernel is ready to respect multiple consoles
+     * for the boot messages, the first named console is the primary console
+     */
+    if (!strcmp(string, "vidconsole"))
+	howto &= ~RB_SERIAL;
+
+    free(string);
+
+    return(howto);
+}
+
+void
+bi_setboothowto(int howto)
+{
+    int		i;
+
+    for (i = 0; howto_names[i].ev != NULL; i++)
+	if (howto & howto_names[i].mask)
+	    setenv(howto_names[i].ev, "YES", 1);
+}
+
+/*
+ * Copy the environment into the load area starting at (addr).
+ * Each variable is formatted as <name>=<value>, with a single nul
+ * separating each variable, and a double nul terminating the environment.
+ */
+vm_offset_t
+bi_copyenv(vm_offset_t addr)
+{
+    struct env_var	*ep;
+    
+    /* traverse the environment */
+    for (ep = environ; ep != NULL; ep = ep->ev_next) {
+        CALLBACK(copyin, ep->ev_name, addr, strlen(ep->ev_name));
+	addr += strlen(ep->ev_name);
+	CALLBACK(copyin, "=", addr, 1);
+	addr++;
+	if (ep->ev_value != NULL) {
+            CALLBACK(copyin, ep->ev_value, addr, strlen(ep->ev_value));
+	    addr += strlen(ep->ev_value);
+	}
+	CALLBACK(copyin, "", addr, 1);
+	addr++;
+    }
+    CALLBACK(copyin, "", addr, 1);
+    addr++;
+    return(addr);
+}
diff --git a/stand/userboot/userboot/bootinfo32.c b/stand/userboot/userboot/bootinfo32.c
new file mode 100644
index 000000000000..6498461a740a
--- /dev/null
+++ b/stand/userboot/userboot/bootinfo32.c
@@ -0,0 +1,262 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <sys/param.h>
+#include <sys/reboot.h>
+#include <sys/linker.h>
+#include <i386/include/bootinfo.h>
+
+#include "bootstrap.h"
+#include "libuserboot.h"
+
+static struct bootinfo  bi;
+
+/*
+ * Copy module-related data into the load area, where it can be
+ * used as a directory for loaded modules.
+ *
+ * Module data is presented in a self-describing format.  Each datum
+ * is preceded by a 32-bit identifier and a 32-bit size field.
+ *
+ * Currently, the following data are saved:
+ *
+ * MOD_NAME	(variable)		module name (string)
+ * MOD_TYPE	(variable)		module type (string)
+ * MOD_ARGS	(variable)		module parameters (string)
+ * MOD_ADDR	sizeof(vm_offset_t)	module load address
+ * MOD_SIZE	sizeof(size_t)		module size
+ * MOD_METADATA	(variable)		type-specific metadata
+ */
+#define COPY32(v, a, c) {			\
+    u_int32_t	x = (v);			\
+    if (c)					\
+        CALLBACK(copyin, &x, a, sizeof(x));	\
+    a += sizeof(x);				\
+}
+
+#define MOD_STR(t, a, s, c) {			\
+    COPY32(t, a, c);				\
+    COPY32(strlen(s) + 1, a, c);		\
+    if (c)					\
+        CALLBACK(copyin, s, a, strlen(s) + 1);  \
+    a += roundup(strlen(s) + 1, sizeof(uint32_t));\
+}
+
+#define MOD_NAME(a, s, c)	MOD_STR(MODINFO_NAME, a, s, c)
+#define MOD_TYPE(a, s, c)	MOD_STR(MODINFO_TYPE, a, s, c)
+#define MOD_ARGS(a, s, c)	MOD_STR(MODINFO_ARGS, a, s, c)
+
+#define MOD_VAR(t, a, s, c) {			\
+    COPY32(t, a, c);				\
+    COPY32(sizeof(s), a, c);			\
+    if (c)					\
+        CALLBACK(copyin, &s, a, sizeof(s));	\
+    a += roundup(sizeof(s), sizeof(uint32_t));	\
+}
+
+#define MOD_ADDR(a, s, c)	MOD_VAR(MODINFO_ADDR, a, s, c)
+#define MOD_SIZE(a, s, c)	MOD_VAR(MODINFO_SIZE, a, s, c)
+
+#define MOD_METADATA(a, mm, c) {		\
+    COPY32(MODINFO_METADATA | mm->md_type, a, c); \
+    COPY32(mm->md_size, a, c);			\
+    if (c)					\
+        CALLBACK(copyin, mm->md_data, a, mm->md_size);    \
+    a += roundup(mm->md_size, sizeof(uint32_t));\
+}
+
+#define MOD_END(a, c) {				\
+    COPY32(MODINFO_END, a, c);			\
+    COPY32(0, a, c);				\
+}
+
+static vm_offset_t
+bi_copymodules32(vm_offset_t addr)
+{
+    struct preloaded_file	*fp;
+    struct file_metadata	*md;
+    int				c;
+
+    c = addr != 0;
+    /* start with the first module on the list, should be the kernel */
+    for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
+
+	MOD_NAME(addr, fp->f_name, c);	/* this field must come first */
+	MOD_TYPE(addr, fp->f_type, c);
+	if (fp->f_args)
+	    MOD_ARGS(addr, fp->f_args, c);
+	MOD_ADDR(addr, fp->f_addr, c);
+	MOD_SIZE(addr, fp->f_size, c);
+	for (md = fp->f_metadata; md != NULL; md = md->md_next)
+	    if (!(md->md_type & MODINFOMD_NOCOPY))
+		MOD_METADATA(addr, md, c);
+    }
+    MOD_END(addr, c);
+    return(addr);
+}
+
+/*
+ * Load the information expected by an i386 kernel.
+ *
+ * - The 'boothowto' argument is constructed
+ * - The 'bootdev' argument is constructed
+ * - The 'bootinfo' struct is constructed, and copied into the kernel space.
+ * - The kernel environment is copied into kernel space.
+ * - Module metadata are formatted and placed in kernel space.
+ */
+int
+bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp)
+{
+    struct preloaded_file	*xp, *kfp;
+    struct i386_devdesc		*rootdev;
+    struct file_metadata	*md;
+    vm_offset_t			addr;
+    vm_offset_t			kernend;
+    vm_offset_t			envp;
+    vm_offset_t			size;
+    vm_offset_t			ssym, esym;
+    char			*rootdevname;
+    int				bootdevnr, howto;
+    char			*kernelname;
+    const char			*kernelpath;
+    uint64_t			lowmem, highmem;
+
+    howto = bi_getboothowto(args);
+
+    /* 
+     * Allow the environment variable 'rootdev' to override the supplied device 
+     * This should perhaps go to MI code and/or have $rootdev tested/set by
+     * MI code before launching the kernel.
+     */
+    rootdevname = getenv("rootdev");
+    userboot_getdev((void **)(&rootdev), rootdevname, NULL);
+    if (rootdev == NULL) {		/* bad $rootdev/$currdev */
+	printf("can't determine root device\n");
+	return(EINVAL);
+    }
+
+    /* Try reading the /etc/fstab file to select the root device */
+    getrootmount(userboot_fmtdev((void *)rootdev));
+
+    bootdevnr = 0;
+#if 0
+    if (bootdevnr == -1) {
+	printf("root device %s invalid\n", i386_fmtdev(rootdev));
+	return (EINVAL);
+    }
+#endif
+    free(rootdev);
+
+    /* find the last module in the chain */
+    addr = 0;
+    for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
+	if (addr < (xp->f_addr + xp->f_size))
+	    addr = xp->f_addr + xp->f_size;
+    }
+    /* pad to a page boundary */
+    addr = roundup(addr, PAGE_SIZE);
+
+    /* copy our environment */
+    envp = addr;
+    addr = bi_copyenv(addr);
+
+    /* pad to a page boundary */
+    addr = roundup(addr, PAGE_SIZE);
+
+    kfp = file_findfile(NULL, "elf kernel");
+    if (kfp == NULL)
+      kfp = file_findfile(NULL, "elf32 kernel");
+    if (kfp == NULL)
+	panic("can't find kernel file");
+    kernend = 0;	/* fill it in later */
+    file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
+    file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
+    file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
+    bios_addsmapdata(kfp);
+
+    /* Figure out the size and location of the metadata */
+    *modulep = addr;
+    size = bi_copymodules32(0);
+    kernend = roundup(addr + size, PAGE_SIZE);
+    *kernendp = kernend;
+
+    /* patch MODINFOMD_KERNEND */
+    md = file_findmetadata(kfp, MODINFOMD_KERNEND);
+    bcopy(&kernend, md->md_data, sizeof kernend);
+
+    /* copy module list and metadata */
+    (void)bi_copymodules32(addr);
+
+    ssym = esym = 0;
+    md = file_findmetadata(kfp, MODINFOMD_SSYM);
+    if (md != NULL)
+	ssym = *((vm_offset_t *)&(md->md_data));
+    md = file_findmetadata(kfp, MODINFOMD_ESYM);
+    if (md != NULL)
+	esym = *((vm_offset_t *)&(md->md_data));
+    if (ssym == 0 || esym == 0)
+	ssym = esym = 0;		/* sanity */
+
+    /* legacy bootinfo structure */
+    kernelname = getenv("kernelname");
+    userboot_getdev(NULL, kernelname, &kernelpath);
+    bi.bi_version = BOOTINFO_VERSION;
+    bi.bi_kernelname = 0;		/* XXX char * -> kernel name */
+    bi.bi_nfs_diskless = 0;		/* struct nfs_diskless * */
+    bi.bi_n_bios_used = 0;		/* XXX would have to hook biosdisk driver for these */
+#if 0
+    for (i = 0; i < N_BIOS_GEOM; i++)
+        bi.bi_bios_geom[i] = bd_getbigeom(i);
+#endif
+    bi.bi_size = sizeof(bi);
+    CALLBACK(getmem, &lowmem, &highmem);
+    bi.bi_memsizes_valid = 1;
+    bi.bi_basemem = 640;
+    bi.bi_extmem = (lowmem - 0x100000) / 1024;
+    bi.bi_envp = envp;
+    bi.bi_modulep = *modulep;
+    bi.bi_kernend = kernend;
+    bi.bi_symtab = ssym;       /* XXX this is only the primary kernel symtab */
+    bi.bi_esymtab = esym;
+
+    /*
+     * Copy the legacy bootinfo and kernel name to the guest at 0x2000
+     */
+    bi.bi_kernelname = 0x2000 + sizeof(bi);
+    CALLBACK(copyin, &bi, 0x2000, sizeof(bi));
+    CALLBACK(copyin, kernelname, 0x2000 + sizeof(bi), strlen(kernelname) + 1);
+
+    /* legacy boot arguments */
+    *howtop = howto | RB_BOOTINFO;
+    *bootdevp = bootdevnr;
+    *bip = 0x2000;
+
+    return(0);
+}
diff --git a/stand/userboot/userboot/bootinfo64.c b/stand/userboot/userboot/bootinfo64.c
new file mode 100644
index 000000000000..10ff133ce54c
--- /dev/null
+++ b/stand/userboot/userboot/bootinfo64.c
@@ -0,0 +1,257 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <sys/param.h>
+#include <sys/reboot.h>
+#include <sys/linker.h>
+#include <i386/include/bootinfo.h>
+#include <machine/cpufunc.h>
+#include <machine/psl.h>
+#include <machine/specialreg.h>
+
+#include "bootstrap.h"
+#include "libuserboot.h"
+
+/*
+ * Copy module-related data into the load area, where it can be
+ * used as a directory for loaded modules.
+ *
+ * Module data is presented in a self-describing format.  Each datum
+ * is preceded by a 32-bit identifier and a 32-bit size field.
+ *
+ * Currently, the following data are saved:
+ *
+ * MOD_NAME	(variable)		module name (string)
+ * MOD_TYPE	(variable)		module type (string)
+ * MOD_ARGS	(variable)		module parameters (string)
+ * MOD_ADDR	sizeof(vm_offset_t)	module load address
+ * MOD_SIZE	sizeof(size_t)		module size
+ * MOD_METADATA	(variable)		type-specific metadata
+ */
+#define COPY32(v, a, c) {			\
+    u_int32_t	x = (v);			\
+    if (c)					\
+        CALLBACK(copyin, &x, a, sizeof(x));	\
+    a += sizeof(x);				\
+}
+
+#define MOD_STR(t, a, s, c) {			\
+    COPY32(t, a, c);				\
+    COPY32(strlen(s) + 1, a, c);		\
+    if (c)					\
+        CALLBACK(copyin, s, a, strlen(s) + 1);  \
+    a += roundup(strlen(s) + 1, sizeof(u_int64_t));\
+}
+
+#define MOD_NAME(a, s, c)	MOD_STR(MODINFO_NAME, a, s, c)
+#define MOD_TYPE(a, s, c)	MOD_STR(MODINFO_TYPE, a, s, c)
+#define MOD_ARGS(a, s, c)	MOD_STR(MODINFO_ARGS, a, s, c)
+
+#define MOD_VAR(t, a, s, c) {			\
+    COPY32(t, a, c);				\
+    COPY32(sizeof(s), a, c);			\
+    if (c)					\
+        CALLBACK(copyin, &s, a, sizeof(s));	\
+    a += roundup(sizeof(s), sizeof(u_int64_t));	\
+}
+
+#define MOD_ADDR(a, s, c)	MOD_VAR(MODINFO_ADDR, a, s, c)
+#define MOD_SIZE(a, s, c)	MOD_VAR(MODINFO_SIZE, a, s, c)
+
+#define MOD_METADATA(a, mm, c) {		\
+    COPY32(MODINFO_METADATA | mm->md_type, a, c); \
+    COPY32(mm->md_size, a, c);			\
+    if (c)					\
+        CALLBACK(copyin, mm->md_data, a, mm->md_size);    \
+    a += roundup(mm->md_size, sizeof(u_int64_t));\
+}
+
+#define MOD_END(a, c) {				\
+    COPY32(MODINFO_END, a, c);			\
+    COPY32(0, a, c);				\
+}
+
+static vm_offset_t
+bi_copymodules64(vm_offset_t addr)
+{
+    struct preloaded_file	*fp;
+    struct file_metadata	*md;
+    int				c;
+    u_int64_t			v;
+
+    c = addr != 0;
+    /* start with the first module on the list, should be the kernel */
+    for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
+
+	MOD_NAME(addr, fp->f_name, c);	/* this field must come first */
+	MOD_TYPE(addr, fp->f_type, c);
+	if (fp->f_args)
+	    MOD_ARGS(addr, fp->f_args, c);
+	v = fp->f_addr;
+	MOD_ADDR(addr, v, c);
+	v = fp->f_size;
+	MOD_SIZE(addr, v, c);
+	for (md = fp->f_metadata; md != NULL; md = md->md_next)
+	    if (!(md->md_type & MODINFOMD_NOCOPY))
+		MOD_METADATA(addr, md, c);
+    }
+    MOD_END(addr, c);
+    return(addr);
+}
+
+/*
+ * Check to see if this CPU supports long mode.
+ */
+static int
+bi_checkcpu(void)
+{
+#if 0
+    char *cpu_vendor;
+    int vendor[3];
+    int eflags, regs[4];
+
+    /* Check for presence of "cpuid". */
+    eflags = read_eflags();
+    write_eflags(eflags ^ PSL_ID);
+    if (!((eflags ^ read_eflags()) & PSL_ID))
+	return (0);
+
+    /* Fetch the vendor string. */
+    do_cpuid(0, regs);
+    vendor[0] = regs[1];
+    vendor[1] = regs[3];
+    vendor[2] = regs[2];
+    cpu_vendor = (char *)vendor;
+
+    /* Check for vendors that support AMD features. */
+    if (strncmp(cpu_vendor, INTEL_VENDOR_ID, 12) != 0 &&
+	strncmp(cpu_vendor, AMD_VENDOR_ID, 12) != 0 &&
+	strncmp(cpu_vendor, CENTAUR_VENDOR_ID, 12) != 0)
+	return (0);
+
+    /* Has to support AMD features. */
+    do_cpuid(0x80000000, regs);
+    if (!(regs[0] >= 0x80000001))
+	return (0);
+
+    /* Check for long mode. */
+    do_cpuid(0x80000001, regs);
+    return (regs[3] & AMDID_LM);
+#else
+	return (1);
+#endif
+}
+
+/*
+ * Load the information expected by an amd64 kernel.
+ *
+ * - The 'boothowto' argument is constructed
+ * - The 'bootdev' argument is constructed
+ * - The 'bootinfo' struct is constructed, and copied into the kernel space.
+ * - The kernel environment is copied into kernel space.
+ * - Module metadata are formatted and placed in kernel space.
+ */
+int
+bi_load64(char *args, vm_offset_t *modulep, vm_offset_t *kernendp)
+{
+    struct preloaded_file	*xp, *kfp;
+    struct userboot_devdesc	*rootdev;
+    struct file_metadata	*md;
+    vm_offset_t			addr;
+    u_int64_t			kernend;
+    u_int64_t			envp;
+    vm_offset_t			size;
+    char			*rootdevname;
+    int				howto;
+
+    if (!bi_checkcpu()) {
+	printf("CPU doesn't support long mode\n");
+	return (EINVAL);
+    }
+
+    howto = bi_getboothowto(args);
+
+    /* 
+     * Allow the environment variable 'rootdev' to override the supplied device 
+     * This should perhaps go to MI code and/or have $rootdev tested/set by
+     * MI code before launching the kernel.
+     */
+    rootdevname = getenv("rootdev");
+    userboot_getdev((void **)(&rootdev), rootdevname, NULL);
+    if (rootdev == NULL) {		/* bad $rootdev/$currdev */
+	printf("can't determine root device\n");
+	return(EINVAL);
+    }
+
+    /* Try reading the /etc/fstab file to select the root device */
+    getrootmount(userboot_fmtdev((void *)rootdev));
+
+    /* find the last module in the chain */
+    addr = 0;
+    for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
+	if (addr < (xp->f_addr + xp->f_size))
+	    addr = xp->f_addr + xp->f_size;
+    }
+    /* pad to a page boundary */
+    addr = roundup(addr, PAGE_SIZE);
+
+    /* copy our environment */
+    envp = addr;
+    addr = bi_copyenv(addr);
+
+    /* pad to a page boundary */
+    addr = roundup(addr, PAGE_SIZE);
+
+    kfp = file_findfile(NULL, "elf kernel");
+    if (kfp == NULL)
+      kfp = file_findfile(NULL, "elf64 kernel");
+    if (kfp == NULL)
+	panic("can't find kernel file");
+    kernend = 0;	/* fill it in later */
+    file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
+    file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
+    file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
+    bios_addsmapdata(kfp);
+
+    /* Figure out the size and location of the metadata */
+    *modulep = addr;
+    size = bi_copymodules64(0);
+    kernend = roundup(addr + size, PAGE_SIZE);
+    *kernendp = kernend;
+
+    /* patch MODINFOMD_KERNEND */
+    md = file_findmetadata(kfp, MODINFOMD_KERNEND);
+    bcopy(&kernend, md->md_data, sizeof kernend);
+
+    /* copy module list and metadata */
+    (void)bi_copymodules64(addr);
+
+    return(0);
+}
diff --git a/stand/userboot/userboot/conf.c b/stand/userboot/userboot/conf.c
new file mode 100644
index 000000000000..b8daa7396ca3
--- /dev/null
+++ b/stand/userboot/userboot/conf.c
@@ -0,0 +1,107 @@
+/*-
+ * Copyright (c) 1997
+ *	Matthias Drochner.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed for the NetBSD Project
+ *	by Matthias Drochner.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	$NetBSD: conf.c,v 1.2 1997/03/22 09:03:29 thorpej Exp $	 
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+
+#include "libuserboot.h"
+
+#if defined(USERBOOT_ZFS_SUPPORT)
+#include "../zfs/libzfs.h"
+#endif
+
+/*
+ * We could use linker sets for some or all of these, but
+ * then we would have to control what ended up linked into
+ * the bootstrap.  So it's easier to conditionalise things
+ * here.
+ *
+ * XXX rename these arrays to be consistent and less namespace-hostile
+ */
+
+/* Exported for libstand */
+struct devsw *devsw[] = {
+	&host_dev,
+	&userboot_disk,
+#if defined(USERBOOT_ZFS_SUPPORT)
+	&zfs_dev,
+#endif
+	NULL
+};
+
+struct fs_ops *file_system[] = {
+	&host_fsops,
+	&ufs_fsops,
+	&cd9660_fsops,
+#if defined(USERBOOT_ZFS_SUPPORT)
+	&zfs_fsops,
+#endif
+	&gzipfs_fsops,
+	&bzipfs_fsops,
+	NULL
+};
+
+/* Exported for i386 only */
+/* 
+ * Sort formats so that those that can detect based on arguments
+ * rather than reading the file go first.
+ */
+extern struct file_format	i386_elf;
+extern struct file_format	i386_elf_obj;
+extern struct file_format	amd64_elf;
+extern struct file_format	amd64_elf_obj;
+
+struct file_format *file_formats[] = {
+    &i386_elf,
+    &i386_elf_obj,
+    &amd64_elf,
+    &amd64_elf_obj,
+    NULL
+};
+
+/* 
+ * Consoles 
+ *
+ * We don't prototype these in libuserboot.h because they require
+ * data structures from bootstrap.h as well.
+ */
+extern struct console userboot_console;
+extern struct console userboot_comconsole;
+
+struct console *consoles[] = {
+	&userboot_console,
+	&userboot_comconsole,
+	NULL
+};
diff --git a/stand/userboot/userboot/copy.c b/stand/userboot/userboot/copy.c
new file mode 100644
index 000000000000..f8763e9b526a
--- /dev/null
+++ b/stand/userboot/userboot/copy.c
@@ -0,0 +1,73 @@
+/*-
+ * Copyright (c) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+
+#include "libuserboot.h"
+
+ssize_t
+userboot_copyin(const void *src, vm_offset_t va, size_t len)
+{
+
+        CALLBACK(copyin, src, va, len);
+	return (len);
+}
+
+ssize_t
+userboot_copyout(vm_offset_t va, void *dst, size_t len)
+{
+
+	CALLBACK(copyout, va, dst, len);
+	return (len);
+}
+
+ssize_t
+userboot_readin(int fd, vm_offset_t va, size_t len)
+{
+	ssize_t res, s;
+	size_t sz;
+	char buf[4096];
+
+	res = 0;
+	while (len > 0) {
+		sz = len;
+		if (sz > sizeof(buf))
+			sz = sizeof(buf);
+		s = read(fd, buf, sz);
+		if (s == 0)
+			break;
+		if (s < 0)
+			return (s);
+		CALLBACK(copyin, buf, va, s);
+		len -= s;
+		res += s;
+		va += s;
+	}
+	return (res);
+}
diff --git a/stand/userboot/userboot/devicename.c b/stand/userboot/userboot/devicename.c
new file mode 100644
index 000000000000..efa5634e541e
--- /dev/null
+++ b/stand/userboot/userboot/devicename.c
@@ -0,0 +1,224 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <string.h>
+
+#include "bootstrap.h"
+#include "disk.h"
+#include "libuserboot.h"
+
+#if defined(USERBOOT_ZFS_SUPPORT)
+#include "../zfs/libzfs.h"
+#endif
+
+static int	userboot_parsedev(struct disk_devdesc **dev, const char *devspec, const char **path);
+
+/* 
+ * Point (dev) at an allocated device specifier for the device matching the
+ * path in (devspec). If it contains an explicit device specification,
+ * use that.  If not, use the default device.
+ */
+int
+userboot_getdev(void **vdev, const char *devspec, const char **path)
+{
+    struct disk_devdesc **dev = (struct disk_devdesc **)vdev;
+    int				rv;
+    
+    /*
+     * If it looks like this is just a path and no
+     * device, go with the current device.
+     */
+    if ((devspec == NULL) || 
+	(devspec[0] == '/') || 
+	(strchr(devspec, ':') == NULL)) {
+
+	if (((rv = userboot_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
+	    (path != NULL))
+		*path = devspec;
+	return(rv);
+    }
+    
+    /*
+     * Try to parse the device name off the beginning of the devspec
+     */
+    return(userboot_parsedev(dev, devspec, path));
+}
+
+/*
+ * Point (dev) at an allocated device specifier matching the string version
+ * at the beginning of (devspec).  Return a pointer to the remaining
+ * text in (path).
+ *
+ * In all cases, the beginning of (devspec) is compared to the names
+ * of known devices in the device switch, and then any following text
+ * is parsed according to the rules applied to the device type.
+ *
+ * For disk-type devices, the syntax is:
+ *
+ * disk<unit>[s<slice>][<partition>]:
+ * 
+ */
+static int
+userboot_parsedev(struct disk_devdesc **dev, const char *devspec, const char **path)
+{
+    struct disk_devdesc *idev;
+    struct devsw	*dv;
+    int			i, unit, err;
+    const char		*cp;
+    const char		*np;
+
+    /* minimum length check */
+    if (strlen(devspec) < 2)
+	return(EINVAL);
+
+    /* look for a device that matches */
+    for (i = 0, dv = NULL; devsw[i] != NULL; i++) {
+	if (!strncmp(devspec, devsw[i]->dv_name, strlen(devsw[i]->dv_name))) {
+	    dv = devsw[i];
+	    break;
+	}
+    }
+    if (dv == NULL)
+	return(ENOENT);
+    idev = malloc(sizeof(struct disk_devdesc));
+    err = 0;
+    np = (devspec + strlen(dv->dv_name));
+        
+    switch(dv->dv_type) {
+    case DEVT_NONE:			/* XXX what to do here?  Do we care? */
+	break;
+
+    case DEVT_DISK:
+	err = disk_parsedev(idev, np, path);
+	if (err != 0)
+	    goto fail;
+	break;
+
+    case DEVT_CD:
+    case DEVT_NET:
+	unit = 0;
+
+	if (*np && (*np != ':')) {
+	    unit = strtol(np, (char **)&cp, 0);	/* get unit number if present */
+	    if (cp == np) {
+		err = EUNIT;
+		goto fail;
+	    }
+	} else {
+		cp = np;
+	}
+	if (*cp && (*cp != ':')) {
+	    err = EINVAL;
+	    goto fail;
+	}
+
+	idev->d_unit = unit;
+	if (path != NULL)
+	    *path = (*cp == 0) ? cp : cp + 1;
+	break;
+
+    case DEVT_ZFS:
+#if defined(USERBOOT_ZFS_SUPPORT)
+	    err = zfs_parsedev((struct zfs_devdesc *)idev, np, path);
+	    if (err != 0)
+		    goto fail;
+	    break;
+#else
+	    /* FALLTHROUGH */
+#endif
+
+    default:
+	err = EINVAL;
+	goto fail;
+    }
+    idev->d_dev = dv;
+    idev->d_type = dv->dv_type;
+    if (dev == NULL) {
+	free(idev);
+    } else {
+	*dev = idev;
+    }
+    return(0);
+
+ fail:
+    free(idev);
+    return(err);
+}
+
+
+char *
+userboot_fmtdev(void *vdev)
+{
+    struct disk_devdesc	*dev = (struct disk_devdesc *)vdev;
+    static char		buf[128];	/* XXX device length constant? */
+
+    switch(dev->d_type) {
+    case DEVT_NONE:
+	strcpy(buf, "(no device)");
+	break;
+
+    case DEVT_CD:
+	sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit);
+	break;
+
+    case DEVT_DISK:
+	return (disk_fmtdev(vdev));
+
+    case DEVT_NET:
+	sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit);
+	break;
+
+    case DEVT_ZFS:
+#if defined(USERBOOT_ZFS_SUPPORT)
+	return (zfs_fmtdev(vdev));
+#else
+	sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit);
+#endif
+	break;
+    }
+    return(buf);
+}
+
+
+/*
+ * Set currdev to suit the value being supplied in (value)
+ */
+int
+userboot_setcurrdev(struct env_var *ev, int flags, const void *value)
+{
+    struct disk_devdesc	*ncurr;
+    int			rv;
+
+    if ((rv = userboot_parsedev(&ncurr, value, NULL)) != 0)
+	return(rv);
+    free(ncurr);
+    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
+    return(0);
+}
diff --git a/stand/userboot/userboot/elf32_freebsd.c b/stand/userboot/userboot/elf32_freebsd.c
new file mode 100644
index 000000000000..d8ccc3375cfd
--- /dev/null
+++ b/stand/userboot/userboot/elf32_freebsd.c
@@ -0,0 +1,114 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/exec.h>
+#include <sys/linker.h>
+#include <string.h>
+#define	_MACHINE_ELF_WANT_32BIT
+#include <i386/include/bootinfo.h>
+#include <i386/include/elf.h>
+#include <stand.h>
+
+#include "bootstrap.h"
+#include "libuserboot.h"
+
+static int	elf32_exec(struct preloaded_file *amp);
+static int	elf32_obj_exec(struct preloaded_file *amp);
+
+struct file_format i386_elf = { elf32_loadfile, elf32_exec };
+struct file_format i386_elf_obj = { elf32_obj_loadfile, elf32_obj_exec };
+
+#define	GUEST_STACK	0x1000		/* Initial stack base */
+#define	GUEST_GDT	0x3000		/* Address of initial GDT */
+
+/*
+ * There is an ELF kernel and one or more ELF modules loaded.  
+ * We wish to start executing the kernel image, so make such 
+ * preparations as are required, and do so.
+ */
+static int
+elf32_exec(struct preloaded_file *fp)
+{
+	struct file_metadata	*md;
+	Elf_Ehdr 		*ehdr;
+	vm_offset_t		entry, bootinfop, modulep, kernend;
+	int			boothowto, err, bootdev;
+	uint32_t		stack[1024], *sp;
+
+
+	if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
+		return(EFTYPE);
+	ehdr = (Elf_Ehdr *)&(md->md_data);
+
+	err = bi_load32(fp->f_args, &boothowto, &bootdev, &bootinfop, &modulep, &kernend);
+	if (err != 0)
+		return(err);
+	entry = ehdr->e_entry & 0xffffff;
+
+#ifdef DEBUG
+	printf("Start @ 0x%lx ...\n", entry);
+#endif
+
+	dev_cleanup();
+
+	/*
+	 * Build a scratch stack at physical 0x1000
+	 */
+	memset(stack, 0, sizeof(stack));
+	sp = (uint32_t *)((char *)stack + sizeof(stack));
+	*--sp = kernend;
+	*--sp = modulep;
+	*--sp = bootinfop;
+	*--sp = 0;
+	*--sp = 0;
+	*--sp = 0;
+	*--sp = bootdev;
+	*--sp = boothowto;
+
+	/*
+	 * Fake return address to mimic "new" boot blocks.  For more
+	 * details see recover_bootinfo in locore.S.
+	 */
+	*--sp = 0xbeefface;
+	CALLBACK(copyin, stack, GUEST_STACK, sizeof(stack));
+	CALLBACK(setreg, 4, (char *)sp - (char *)stack + GUEST_STACK);
+
+	CALLBACK(setgdt, GUEST_GDT, 8 * 4 - 1);
+
+        CALLBACK(exec, entry);
+
+	panic("exec returned");
+}
+
+static int
+elf32_obj_exec(struct preloaded_file *fp)
+{
+	return (EFTYPE);
+}
diff --git a/stand/userboot/userboot/elf64_freebsd.c b/stand/userboot/userboot/elf64_freebsd.c
new file mode 100644
index 000000000000..19d369d6d548
--- /dev/null
+++ b/stand/userboot/userboot/elf64_freebsd.c
@@ -0,0 +1,172 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#define __ELF_WORD_SIZE 64
+#include <sys/param.h>
+#include <sys/exec.h>
+#include <sys/linker.h>
+#include <string.h>
+#include <i386/include/bootinfo.h>
+#include <machine/elf.h>
+#include <stand.h>
+
+#include "bootstrap.h"
+#include "libuserboot.h"
+
+static int	elf64_exec(struct preloaded_file *amp);
+static int	elf64_obj_exec(struct preloaded_file *amp);
+
+struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
+struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec };
+
+#define MSR_EFER        0xc0000080
+#define EFER_LME        0x00000100
+#define	EFER_LMA 	0x00000400	/* Long mode active (R) */
+#define CR4_PAE         0x00000020
+#define	CR4_VMXE	(1UL << 13)
+#define CR4_PSE         0x00000010
+#define CR0_PG          0x80000000
+#define	CR0_PE		0x00000001	/* Protected mode Enable */
+#define	CR0_NE		0x00000020	/* Numeric Error enable (EX16 vs IRQ13) */
+
+#define PG_V	0x001
+#define PG_RW	0x002
+#define PG_U	0x004
+#define PG_PS	0x080
+
+typedef u_int64_t p4_entry_t;
+typedef u_int64_t p3_entry_t;
+typedef u_int64_t p2_entry_t;
+
+#define	GUEST_NULL_SEL		0
+#define	GUEST_CODE_SEL		1
+#define	GUEST_DATA_SEL		2
+#define	GUEST_GDTR_LIMIT	(3 * 8 - 1)
+
+static void
+setup_freebsd_gdt(uint64_t *gdtr)
+{
+	gdtr[GUEST_NULL_SEL] = 0;
+	gdtr[GUEST_CODE_SEL] = 0x0020980000000000;
+	gdtr[GUEST_DATA_SEL] = 0x0000900000000000;
+}
+
+/*
+ * There is an ELF kernel and one or more ELF modules loaded.
+ * We wish to start executing the kernel image, so make such
+ * preparations as are required, and do so.
+ */
+static int
+elf64_exec(struct preloaded_file *fp)
+{
+	struct file_metadata	*md;
+	Elf_Ehdr 		*ehdr;
+	vm_offset_t		modulep, kernend;
+	int			err;
+	int			i;
+	uint32_t		stack[1024];
+	p4_entry_t		PT4[512];
+	p3_entry_t		PT3[512];
+	p2_entry_t		PT2[512];
+	uint64_t		gdtr[3];
+
+	if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
+		return(EFTYPE);
+	ehdr = (Elf_Ehdr *)&(md->md_data);
+
+	err = bi_load64(fp->f_args, &modulep, &kernend);
+	if (err != 0)
+		return(err);
+
+	bzero(PT4, PAGE_SIZE);
+	bzero(PT3, PAGE_SIZE);
+	bzero(PT2, PAGE_SIZE);
+
+	/*
+	 * Build a scratch stack at physical 0x1000, page tables:
+	 *	PT4 at 0x2000,
+	 *	PT3 at 0x3000,
+	 *	PT2 at 0x4000,
+	 *      gdtr at 0x5000,
+	 */
+
+	/*
+	 * This is kinda brutal, but every single 1GB VM memory segment
+	 * points to the same first 1GB of physical memory.  But it is
+	 * more than adequate.
+	 */
+	for (i = 0; i < 512; i++) {
+		/* Each slot of the level 4 pages points to the same level 3 page */
+		PT4[i] = (p4_entry_t) 0x3000;
+		PT4[i] |= PG_V | PG_RW | PG_U;
+
+		/* Each slot of the level 3 pages points to the same level 2 page */
+		PT3[i] = (p3_entry_t) 0x4000;
+		PT3[i] |= PG_V | PG_RW | PG_U;
+
+		/* The level 2 page slots are mapped with 2MB pages for 1GB. */
+		PT2[i] = i * (2 * 1024 * 1024);
+		PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
+	}
+
+#ifdef DEBUG
+	printf("Start @ %#llx ...\n", ehdr->e_entry);
+#endif
+
+	dev_cleanup();
+
+	stack[0] = 0;		/* return address */
+	stack[1] = modulep;
+	stack[2] = kernend;
+	CALLBACK(copyin, stack, 0x1000, sizeof(stack));
+	CALLBACK(copyin, PT4, 0x2000, sizeof(PT4));
+	CALLBACK(copyin, PT3, 0x3000, sizeof(PT3));
+	CALLBACK(copyin, PT2, 0x4000, sizeof(PT2));
+	CALLBACK(setreg, 4, 0x1000);
+
+	CALLBACK(setmsr, MSR_EFER, EFER_LMA | EFER_LME);
+	CALLBACK(setcr, 4, CR4_PAE | CR4_VMXE);
+	CALLBACK(setcr, 3, 0x2000);
+	CALLBACK(setcr, 0, CR0_PG | CR0_PE | CR0_NE);
+
+	setup_freebsd_gdt(gdtr);
+	CALLBACK(copyin, gdtr, 0x5000, sizeof(gdtr));
+        CALLBACK(setgdt, 0x5000, sizeof(gdtr));
+
+	CALLBACK(exec, ehdr->e_entry);
+
+	panic("exec returned");
+}
+
+static int
+elf64_obj_exec(struct preloaded_file *fp)
+{
+
+	return (EFTYPE);
+}
diff --git a/stand/userboot/userboot/host.c b/stand/userboot/userboot/host.c
new file mode 100644
index 000000000000..94f8a3dca44c
--- /dev/null
+++ b/stand/userboot/userboot/host.c
@@ -0,0 +1,202 @@
+/*-
+ * Copyright (c) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Read from the host filesystem
+ */
+
+#include <sys/param.h>
+#include <sys/time.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stand.h>
+#include <bootstrap.h>
+
+#include "libuserboot.h"
+
+/*
+ * Open a file.
+ */
+static int
+host_open(const char *upath, struct open_file *f)
+{
+
+	if (f->f_dev != &host_dev)
+		return (EINVAL);
+
+	return (CALLBACK(open, upath, &f->f_fsdata));
+}
+
+static int
+host_close(struct open_file *f)
+{
+
+        CALLBACK(close, f->f_fsdata);
+	f->f_fsdata = (void *)0;
+
+	return (0);
+}
+
+/*
+ * Copy a portion of a file into memory.
+ */
+static int
+host_read(struct open_file *f, void *start, size_t size, size_t *resid)
+{
+
+	return (CALLBACK(read, f->f_fsdata, start, size, resid));
+}
+
+/*
+ * Don't be silly - the bootstrap has no business writing anything.
+ */
+static int
+host_write(struct open_file *f, void *start, size_t size, size_t *resid)
+{
+
+	return (EROFS);
+}
+
+static off_t
+host_seek(struct open_file *f, off_t offset, int where)
+{
+
+	return (CALLBACK(seek, f->f_fsdata, offset, where));
+}
+
+static int
+host_stat(struct open_file *f, struct stat *sb)
+{
+	int mode;
+	int uid;
+	int gid;
+	uint64_t size;
+
+	CALLBACK(stat, f->f_fsdata, &mode, &uid, &gid, &size);
+	sb->st_mode = mode;
+	sb->st_uid = uid;
+	sb->st_gid = gid;
+	sb->st_size = size;
+	return (0);
+}
+
+static int
+host_readdir(struct open_file *f, struct dirent *d)
+{
+	uint32_t fileno;
+	uint8_t type;
+	size_t namelen;
+	int rc;
+
+	rc = CALLBACK(readdir, f->f_fsdata, &fileno, &type, &namelen,
+            d->d_name);
+	if (rc)
+		return (rc);
+
+	d->d_fileno = fileno;
+	d->d_type = type;
+	d->d_namlen = namelen;
+
+	return (0);
+}
+
+static int
+host_dev_init(void)
+{
+
+	return (0);
+}
+
+static int
+host_dev_print(int verbose)
+{
+	char line[80];
+
+	printf("%s devices:", host_dev.dv_name);
+	if (pager_output("\n") != 0)
+		return (1);
+
+	snprintf(line, sizeof(line), "    host%d:   Host filesystem\n", 0);
+	return (pager_output(line));
+}
+
+/*
+ * 'Open' the host device.
+ */
+static int
+host_dev_open(struct open_file *f, ...)
+{
+	va_list		args;
+	struct devdesc	*dev;
+
+	va_start(args, f);
+	dev = va_arg(args, struct devdesc*);
+	va_end(args);
+
+	return (0);
+}
+
+static int
+host_dev_close(struct open_file *f)
+{
+
+	return (0);
+}
+
+static int
+host_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
+    char *buf, size_t *rsize)
+{
+
+	return (ENOSYS);
+}
+
+struct fs_ops host_fsops = {
+	"host",
+	host_open,
+	host_close,
+	host_read,
+	host_write,
+	host_seek,
+	host_stat,
+	host_readdir
+};
+
+struct devsw host_dev = {
+	.dv_name = "host",
+	.dv_type = DEVT_NET,
+	.dv_init = host_dev_init,
+	.dv_strategy = host_dev_strategy,
+	.dv_open = host_dev_open,
+	.dv_close = host_dev_close,
+	.dv_ioctl = noioctl,
+	.dv_print = host_dev_print,
+	.dv_cleanup = NULL
+};
diff --git a/stand/userboot/userboot/libuserboot.h b/stand/userboot/userboot/libuserboot.h
new file mode 100644
index 000000000000..e2048d5fef94
--- /dev/null
+++ b/stand/userboot/userboot/libuserboot.h
@@ -0,0 +1,68 @@
+/*-
+ * Copyright (c) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include "userboot.h"
+
+extern struct loader_callbacks *callbacks;
+extern void *callbacks_arg;
+
+#define	CALLBACK(fn, args...) (callbacks->fn(callbacks_arg , ##args))
+
+#define	MAXDEV	31	/* maximum number of distinct devices */
+
+typedef unsigned long physaddr_t;
+
+/* exported devices */
+extern struct devsw userboot_disk;
+extern int userboot_disk_maxunit;
+extern struct devsw host_dev;
+
+/* access to host filesystem */
+struct fs_ops host_fsops;
+
+struct bootinfo;
+struct preloaded_file;
+extern int		bi_load(struct bootinfo *, struct preloaded_file *);
+
+extern void delay(int);
+
+extern int userboot_autoload(void);
+extern ssize_t userboot_copyin(const void *, vm_offset_t, size_t);
+extern ssize_t userboot_copyout(vm_offset_t, void *, size_t);
+extern ssize_t userboot_readin(int, vm_offset_t, size_t);
+extern int userboot_getdev(void **, const char *, const char **);
+char	*userboot_fmtdev(void *vdev);
+int	userboot_setcurrdev(struct env_var *ev, int flags, const void *value);
+
+int	bi_getboothowto(char *kargs);
+void	bi_setboothowto(int howto);
+vm_offset_t	bi_copyenv(vm_offset_t addr);
+int	bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip,
+    vm_offset_t *modulep, vm_offset_t *kernend);
+int	bi_load64(char *args, vm_offset_t *modulep, vm_offset_t *kernend);
+void	bios_addsmapdata(struct preloaded_file *kfp);
diff --git a/stand/userboot/userboot/main.c b/stand/userboot/userboot/main.c
new file mode 100644
index 000000000000..9e69724b17a9
--- /dev/null
+++ b/stand/userboot/userboot/main.c
@@ -0,0 +1,304 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * Copyright (c) 1998,2000 Doug Rabson <dfr@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <string.h>
+#include <setjmp.h>
+#include <sys/disk.h>
+
+#include "bootstrap.h"
+#include "disk.h"
+#include "libuserboot.h"
+
+#if defined(USERBOOT_ZFS_SUPPORT)
+#include "../zfs/libzfs.h"
+
+static void userboot_zfs_probe(void);
+static int userboot_zfs_found;
+#endif
+
+/* Minimum version required */
+#define	USERBOOT_VERSION	USERBOOT_VERSION_3
+
+#define	MALLOCSZ		(64*1024*1024)
+
+struct loader_callbacks *callbacks;
+void *callbacks_arg;
+
+extern char bootprog_info[];
+static jmp_buf jb;
+
+struct arch_switch archsw;	/* MI/MD interface boundary */
+
+static void	extract_currdev(void);
+
+void
+delay(int usec)
+{
+
+	CALLBACK(delay, usec);
+}
+
+void
+exit(int v)
+{
+
+	CALLBACK(exit, v);
+	longjmp(jb, 1);
+}
+
+void
+loader_main(struct loader_callbacks *cb, void *arg, int version, int ndisks)
+{
+	static char mallocbuf[MALLOCSZ];
+	const char *var;
+	int i;
+
+	if (version < USERBOOT_VERSION)
+		abort();
+
+	callbacks = cb;
+	callbacks_arg = arg;
+	userboot_disk_maxunit = ndisks;
+
+	/*
+	 * initialise the heap as early as possible.  Once this is done,
+	 * alloc() is usable.
+	 */
+	setheap((void *)mallocbuf, (void *)(mallocbuf + sizeof(mallocbuf)));
+
+	/*
+	 * Hook up the console
+	 */
+	cons_probe();
+
+	printf("\n%s", bootprog_info);
+#if 0
+	printf("Memory: %ld k\n", memsize() / 1024);
+#endif
+
+	setenv("LINES", "24", 1);	/* optional */
+
+	/*
+	 * Set custom environment variables
+	 */
+	i = 0;
+	while (1) {
+		var = CALLBACK(getenv, i++);
+		if (var == NULL)
+			break;
+		putenv(var);
+	}
+
+	archsw.arch_autoload = userboot_autoload;
+	archsw.arch_getdev = userboot_getdev;
+	archsw.arch_copyin = userboot_copyin;
+	archsw.arch_copyout = userboot_copyout;
+	archsw.arch_readin = userboot_readin;
+#if defined(USERBOOT_ZFS_SUPPORT)
+	archsw.arch_zfs_probe = userboot_zfs_probe;
+#endif
+
+	/*
+	 * Initialise the block cache. Set the upper limit.
+	 */
+	bcache_init(32768, 512);
+	/*
+	 * March through the device switch probing for things.
+	 */
+	for (i = 0; devsw[i] != NULL; i++)
+		if (devsw[i]->dv_init != NULL)
+			(devsw[i]->dv_init)();
+
+	extract_currdev();
+
+	if (setjmp(jb))
+		return;
+
+	interact(NULL);			/* doesn't return */
+
+	exit(0);
+}
+
+/*
+ * Set the 'current device' by (if possible) recovering the boot device as 
+ * supplied by the initial bootstrap.
+ */
+static void
+extract_currdev(void)
+{
+	struct disk_devdesc dev;
+
+	//bzero(&dev, sizeof(dev));
+
+#if defined(USERBOOT_ZFS_SUPPORT)
+	if (userboot_zfs_found) {
+		struct zfs_devdesc zdev;
+	
+		/* Leave the pool/root guid's unassigned */
+		bzero(&zdev, sizeof(zdev));
+		zdev.d_dev = &zfs_dev;
+		zdev.d_type = zdev.d_dev->dv_type;
+		
+		dev = *(struct disk_devdesc *)&zdev;
+		init_zfs_bootenv(zfs_fmtdev(&dev));
+	} else
+#endif
+
+	if (userboot_disk_maxunit > 0) {
+		dev.d_dev = &userboot_disk;
+		dev.d_type = dev.d_dev->dv_type;
+		dev.d_unit = 0;
+		dev.d_slice = 0;
+		dev.d_partition = 0;
+		/*
+		 * If we cannot auto-detect the partition type then
+		 * access the disk as a raw device.
+		 */
+		if (dev.d_dev->dv_open(NULL, &dev)) {
+			dev.d_slice = -1;
+			dev.d_partition = -1;
+		}
+	} else {
+		dev.d_dev = &host_dev;
+		dev.d_type = dev.d_dev->dv_type;
+		dev.d_unit = 0;
+	}
+
+	env_setenv("currdev", EV_VOLATILE, userboot_fmtdev(&dev),
+	    userboot_setcurrdev, env_nounset);
+	env_setenv("loaddev", EV_VOLATILE, userboot_fmtdev(&dev),
+	    env_noset, env_nounset);
+}
+
+#if defined(USERBOOT_ZFS_SUPPORT)
+static void
+userboot_zfs_probe(void)
+{
+	char devname[32];
+	uint64_t pool_guid;
+	int unit;
+
+	/*
+	 * Open all the disks we can find and see if we can reconstruct
+	 * ZFS pools from them. Record if any were found.
+	 */
+	for (unit = 0; unit < userboot_disk_maxunit; unit++) {
+		sprintf(devname, "disk%d:", unit);
+		pool_guid = 0;
+		zfs_probe_dev(devname, &pool_guid);
+		if (pool_guid != 0)
+			userboot_zfs_found = 1;
+	}
+}
+
+COMMAND_SET(lszfs, "lszfs", "list child datasets of a zfs dataset",
+	    command_lszfs);
+
+static int
+command_lszfs(int argc, char *argv[])
+{
+	int err;
+
+	if (argc != 2) {
+		command_errmsg = "a single dataset must be supplied";
+		return (CMD_ERROR);
+	}
+
+	err = zfs_list(argv[1]);
+	if (err != 0) {
+		command_errmsg = strerror(err);
+		return (CMD_ERROR);
+	}
+	return (CMD_OK);
+}
+
+COMMAND_SET(reloadbe, "reloadbe", "refresh the list of ZFS Boot Environments",
+	    command_reloadbe);
+
+static int
+command_reloadbe(int argc, char *argv[])
+{
+	int err;
+	char *root;
+
+	if (argc > 2) {
+		command_errmsg = "wrong number of arguments";
+		return (CMD_ERROR);
+	}
+
+	if (argc == 2) {
+		err = zfs_bootenv(argv[1]);
+	} else {
+		root = getenv("zfs_be_root");
+		if (root == NULL) {
+			return (CMD_OK);
+		}
+		err = zfs_bootenv(root);
+	}
+
+	if (err != 0) {
+		command_errmsg = strerror(err);
+		return (CMD_ERROR);
+	}
+
+	return (CMD_OK);
+}
+
+uint64_t
+ldi_get_size(void *priv)
+{
+	int fd = (uintptr_t) priv;
+	uint64_t size;
+
+	ioctl(fd, DIOCGMEDIASIZE, &size);
+	return (size);
+}
+#endif /* USERBOOT_ZFS_SUPPORT */
+
+COMMAND_SET(quit, "quit", "exit the loader", command_quit);
+
+static int
+command_quit(int argc, char *argv[])
+{
+
+	exit(USERBOOT_EXIT_QUIT);
+	return (CMD_OK);
+}
+
+COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
+
+static int
+command_reboot(int argc, char *argv[])
+{
+
+	exit(USERBOOT_EXIT_REBOOT);
+	return (CMD_OK);
+}
diff --git a/stand/userboot/userboot/userboot_cons.c b/stand/userboot/userboot/userboot_cons.c
new file mode 100644
index 000000000000..6f73ad5633bb
--- /dev/null
+++ b/stand/userboot/userboot/userboot_cons.c
@@ -0,0 +1,130 @@
+/*-
+ * Copyright (c) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include "bootstrap.h"
+#include "libuserboot.h"
+
+int console;
+
+static struct console *userboot_comconsp;
+
+static void userboot_cons_probe(struct console *cp);
+static int userboot_cons_init(int);
+static void userboot_comcons_probe(struct console *cp);
+static int userboot_comcons_init(int);
+static void userboot_cons_putchar(int);
+static int userboot_cons_getchar(void);
+static int userboot_cons_poll(void);
+
+struct console userboot_console = {
+	"userboot",
+	"userboot",
+	0,
+	userboot_cons_probe,
+	userboot_cons_init,
+	userboot_cons_putchar,
+	userboot_cons_getchar,
+	userboot_cons_poll,
+};
+
+/*
+ * Provide a simple alias to allow loader scripts to set the
+ * console to comconsole without resulting in an error
+ */
+struct console userboot_comconsole = {
+	"comconsole",
+	"comconsole",
+	0,
+	userboot_comcons_probe,
+	userboot_comcons_init,
+	userboot_cons_putchar,
+	userboot_cons_getchar,
+	userboot_cons_poll,
+};
+
+static void
+userboot_cons_probe(struct console *cp)
+{
+
+	cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
+}
+
+static int
+userboot_cons_init(int arg)
+{
+
+	return (0);
+}
+
+static void
+userboot_comcons_probe(struct console *cp)
+{
+
+	/*
+	 * Save the console pointer so the comcons_init routine
+	 * can set the C_PRESENT* flags. They are not set
+	 * here to allow the existing userboot console to
+	 * be elected the default.
+	 */
+	userboot_comconsp = cp;
+}
+
+static int
+userboot_comcons_init(int arg)
+{
+
+	/*
+	 * Set the C_PRESENT* flags to allow the comconsole
+	 * to be selected as the active console
+	 */
+	userboot_comconsp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
+	return (0);
+}
+
+static void
+userboot_cons_putchar(int c)
+{
+
+        CALLBACK(putc, c);
+}
+
+static int
+userboot_cons_getchar()
+{
+
+	return (CALLBACK(getc));
+}
+
+static int
+userboot_cons_poll()
+{
+
+	return (CALLBACK(poll));
+}
diff --git a/stand/userboot/userboot/userboot_disk.c b/stand/userboot/userboot/userboot_disk.c
new file mode 100644
index 000000000000..fc21b5f1792d
--- /dev/null
+++ b/stand/userboot/userboot/userboot_disk.c
@@ -0,0 +1,242 @@
+/*-
+ * Copyright (c) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Userboot disk image handling.
+ */
+
+#include <sys/disk.h>
+#include <stand.h>
+#include <stdarg.h>
+#include <bootstrap.h>
+
+#include "disk.h"
+#include "libuserboot.h"
+
+struct userdisk_info {
+	uint64_t	mediasize;
+	uint16_t	sectorsize;
+	int		ud_open;	/* reference counter */
+	void		*ud_bcache;	/* buffer cache data */
+};
+
+int userboot_disk_maxunit = 0;
+
+static int userdisk_maxunit = 0;
+static struct userdisk_info	*ud_info;
+
+static int	userdisk_init(void);
+static void	userdisk_cleanup(void);
+static int	userdisk_strategy(void *devdata, int flag, daddr_t dblk,
+		    size_t size, char *buf, size_t *rsize);
+static int	userdisk_realstrategy(void *devdata, int flag, daddr_t dblk,
+		    size_t size, char *buf, size_t *rsize);
+static int	userdisk_open(struct open_file *f, ...);
+static int	userdisk_close(struct open_file *f);
+static int	userdisk_ioctl(struct open_file *f, u_long cmd, void *data);
+static int	userdisk_print(int verbose);
+
+struct devsw userboot_disk = {
+	"disk",
+	DEVT_DISK,
+	userdisk_init,
+	userdisk_strategy,
+	userdisk_open,
+	userdisk_close,
+	userdisk_ioctl,
+	userdisk_print,
+	userdisk_cleanup
+};
+
+/*
+ * Initialize userdisk_info structure for each disk.
+ */
+static int
+userdisk_init(void)
+{
+	off_t mediasize;
+	u_int sectorsize;
+	int i;
+
+	userdisk_maxunit = userboot_disk_maxunit;
+	if (userdisk_maxunit > 0) {
+		ud_info = malloc(sizeof(*ud_info) * userdisk_maxunit);
+		if (ud_info == NULL)
+			return (ENOMEM);
+		for (i = 0; i < userdisk_maxunit; i++) {
+			if (CALLBACK(diskioctl, i, DIOCGSECTORSIZE,
+			    &sectorsize) != 0 || CALLBACK(diskioctl, i,
+			    DIOCGMEDIASIZE, &mediasize) != 0)
+				return (ENXIO);
+			ud_info[i].mediasize = mediasize;
+			ud_info[i].sectorsize = sectorsize;
+			ud_info[i].ud_open = 0;
+			ud_info[i].ud_bcache = NULL;
+		}
+	}
+	bcache_add_dev(userdisk_maxunit);
+	return(0);
+}
+
+static void
+userdisk_cleanup(void)
+{
+
+	if (userdisk_maxunit > 0)
+		free(ud_info);
+}
+
+/*
+ * Print information about disks
+ */
+static int
+userdisk_print(int verbose)
+{
+	struct disk_devdesc dev;
+	char line[80];
+	int i, ret = 0;
+
+	if (userdisk_maxunit == 0)
+		return (0);
+
+	printf("%s devices:", userboot_disk.dv_name);
+	if ((ret = pager_output("\n")) != 0)
+		return (ret);
+
+	for (i = 0; i < userdisk_maxunit; i++) {
+		snprintf(line, sizeof(line),
+		    "    disk%d:   Guest drive image\n", i);
+		ret = pager_output(line);
+		if (ret != 0)
+			break;
+		dev.d_dev = &userboot_disk;
+		dev.d_unit = i;
+		dev.d_slice = -1;
+		dev.d_partition = -1;
+		if (disk_open(&dev, ud_info[i].mediasize,
+		    ud_info[i].sectorsize) == 0) {
+			snprintf(line, sizeof(line), "    disk%d", i);
+			ret = disk_print(&dev, line, verbose);
+			disk_close(&dev);
+			if (ret != 0)
+				break;
+		}
+	}
+	return (ret);
+}
+
+/*
+ * Attempt to open the disk described by (dev) for use by (f).
+ */
+static int
+userdisk_open(struct open_file *f, ...)
+{
+	va_list			ap;
+	struct disk_devdesc	*dev;
+
+	va_start(ap, f);
+	dev = va_arg(ap, struct disk_devdesc *);
+	va_end(ap);
+
+	if (dev->d_unit < 0 || dev->d_unit >= userdisk_maxunit)
+		return (EIO);
+	ud_info[dev->d_unit].ud_open++;
+	if (ud_info[dev->d_unit].ud_bcache == NULL)
+		ud_info[dev->d_unit].ud_bcache = bcache_allocate();
+	return (disk_open(dev, ud_info[dev->d_unit].mediasize,
+	    ud_info[dev->d_unit].sectorsize));
+}
+
+static int
+userdisk_close(struct open_file *f)
+{
+	struct disk_devdesc *dev;
+
+	dev = (struct disk_devdesc *)f->f_devdata;
+	ud_info[dev->d_unit].ud_open--;
+	if (ud_info[dev->d_unit].ud_open == 0) {
+		bcache_free(ud_info[dev->d_unit].ud_bcache);
+		ud_info[dev->d_unit].ud_bcache = NULL;
+	}
+	return (disk_close(dev));
+}
+
+static int
+userdisk_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
+    char *buf, size_t *rsize)
+{
+	struct bcache_devdata bcd;
+	struct disk_devdesc *dev;
+
+	dev = (struct disk_devdesc *)devdata;
+	bcd.dv_strategy = userdisk_realstrategy;
+	bcd.dv_devdata = devdata;
+	bcd.dv_cache = ud_info[dev->d_unit].ud_bcache;
+	return (bcache_strategy(&bcd, rw, dblk + dev->d_offset,
+	    size, buf, rsize));
+}
+
+static int
+userdisk_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
+    char *buf, size_t *rsize)
+{
+	struct disk_devdesc *dev = devdata;
+	uint64_t	off;
+	size_t		resid;
+	int		rc;
+
+	rw &= F_MASK;
+	if (rw == F_WRITE)
+		return (EROFS);
+	if (rw != F_READ)
+		return (EINVAL);
+	if (rsize)
+		*rsize = 0;
+	off = dblk * ud_info[dev->d_unit].sectorsize;
+	rc = CALLBACK(diskread, dev->d_unit, off, buf, size, &resid);
+	if (rc)
+		return (rc);
+	if (rsize)
+		*rsize = size - resid;
+	return (0);
+}
+
+static int
+userdisk_ioctl(struct open_file *f, u_long cmd, void *data)
+{
+	struct disk_devdesc *dev;
+	int rc;
+
+	dev = (struct disk_devdesc *)f->f_devdata;
+	rc = disk_ioctl(dev, cmd, data);
+	if (rc != ENOTTY)
+		return (rc);
+
+	return (CALLBACK(diskioctl, dev->d_unit, cmd, data));
+}
diff --git a/stand/userboot/userboot/version b/stand/userboot/userboot/version
new file mode 100644
index 000000000000..ce6e2701fdc3
--- /dev/null
+++ b/stand/userboot/userboot/version
@@ -0,0 +1,4 @@
+$FreeBSD$
+
+1.1:	Initial userland boot
+