Index: sys/boot/i386/pmbr-datadisk/pmbr-datadisk.s
===================================================================
--- sys/boot/i386/pmbr-datadisk/pmbr-datadisk.s (revision 0)
+++ sys/boot/i386/pmbr-datadisk/pmbr-datadisk.s (revision 0)
@@ -0,0 +1,117 @@
+#-
+# Copyright (c) 2007 Yahoo!, Inc.
+# All rights reserved.
+# Written by: John Baldwin <jhb@FreeBSD.org>
+#
+# 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. Neither the name of the author nor the names of any co-contributors
+# may be used to endorse or promote products derived from this software
+# without specific prior written permission.
+#
+# 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.
+#
+# From FreeBSD: head/sys/boot/i386/pmbr/pmbr.s 173957 2007-11-26 21:29:59Z jhb
+#
+# Partly from: src/sys/boot/i386/mbr/mbr.s 1.7
+
+# A 512 byte PMBR boot manager that looks for a FreeBSD boot GPT partition
+# and boots it.
+
+ .set LOAD,0x7c00 # Load address
+ .set EXEC,0x600 # Execution address
+ .set MAGIC,0xaa55 # Magic: bootable
+ .set SECSIZE,0x200 # Size of a single disk sector
+ .set DISKSIG,440 # Disk signature offset
+ .set STACK,EXEC+SECSIZE*4 # Stack address
+ .set GPT_ADDR,STACK # GPT header address
+ .set GPT_SIG,0
+ .set GPT_SIG_0,0x20494645
+ .set GPT_SIG_1,0x54524150
+ .set GPT_MYLBA,24
+ .set GPT_PART_LBA,72
+ .set GPT_NPART,80
+ .set GPT_PART_SIZE,84
+ .set PART_ADDR,GPT_ADDR+SECSIZE # GPT partition array address
+ .set PART_TYPE,0
+ .set PART_START_LBA,32
+ .set PART_END_LBA,40
+
+ .set NHRDRV,0x475 # Number of hard drives
+
+ .globl start # Entry point
+ .code16
+
+#
+# Setup the segment registers for flat addressing and setup the stack.
+#
+start: cld # String ops inc
+ xorw %ax,%ax # Zero
+ movw %ax,%es # Address
+ movw %ax,%ds # data
+ movw %ax,%ss # Set up
+ movw $STACK,%sp # stack
+#
+# Relocate ourself to a lower address so that we have more room to load
+# other sectors.
+#
+ movw $main-EXEC+LOAD,%si # Source
+ movw $main,%di # Destination
+ movw $SECSIZE-(main-start),%cx # Byte count
+ rep # Relocate
+ movsb # code
+#
+# Jump to the relocated code.
+#
+ jmp main-LOAD+EXEC # To relocated code
+
+main: movw $msg_datadisk,%si
+ jmp putstr
+
+#
+# Output an ASCIZ string to the console via the BIOS.
+#
+putstr.0: movw $0x7,%bx # Page:attribute
+ movb $0xe,%ah # BIOS: Display
+ int $0x10 # character
+putstr: lodsb # Get character
+ testb %al,%al # End of string?
+ jnz putstr.0 # No
+putstr.1: jmp putstr.1 # Await reset
+
+msg_datadisk: .asciz "This is a FreeNAS data disk and can not boot system. System halted."
+
+boot_uuid: .long 0x83bd6b9d
+ .word 0x7f41
+ .word 0x11dc
+ .byte 0xbe
+ .byte 0x0b
+ .byte 0x00
+ .byte 0x15
+ .byte 0x60
+ .byte 0xb8
+ .byte 0x4f
+ .byte 0x0f
+
+ .org DISKSIG,0x90
+sig: .long 0 # OS Disk Signature
+ .word 0 # "Unknown" in PMBR
+
+partbl: .fill 0x10,0x4,0x0 # Partition table
+ .word MAGIC # Magic number
Index: sys/boot/i386/pmbr-datadisk/Makefile
===================================================================
--- sys/boot/i386/pmbr-datadisk/Makefile (revision 0)
+++ sys/boot/i386/pmbr-datadisk/Makefile (revision 0)
@@ -0,0 +1,14 @@
+# $FreeBSD$
+
+PROG= pmbr-datadisk
+STRIP=
+BINMODE=${NOBINMODE}
+NO_MAN=
+SRCS= ${PROG}.s
+
+ORG= 0x600
+
+AFLAGS+=--defsym FLAGS=${BOOT_MBR_FLAGS}
+LDFLAGS=-e start -Ttext ${ORG} -Wl,-N,-S,--oformat,binary
+
+.include <bsd.prog.mk>
Index: sys/boot/i386/Makefile
===================================================================
--- sys/boot/i386/Makefile (revision 223601)
+++ sys/boot/i386/Makefile (working copy)
@@ -4,6 +4,7 @@
SUBDIR= mbr pmbr boot0 boot0sio btx boot2 cdboot gptboot kgzldr \
libi386 libfirewire loader
+SUBDIR+= pmbr-datadisk
# special boot programs, 'self-extracting boot2+loader'
SUBDIR+= pxeldr
