Index: sys/conf/NOTES =================================================================== --- sys/conf/NOTES +++ sys/conf/NOTES @@ -1078,6 +1078,14 @@ # Make space in the kernel for a root filesystem on a md device. # Define to the number of kilobytes to reserve for the filesystem. +# This is now optional. +# If not defined, the root filesystem passed in as the MFS_IMAGE makeoption +# will be automatically embedded in the kernel during linking. Its exact size +# will be consumed within the kernel. +# If defined, the old way of embedding the filesystem in the kernel will be +# used. That is to say MD_ROOT_SIZE KB will be allocated in the kernel and +# later, the filesystem image passed in as the MFS_IMAGE makeoption will be +# dd'd into the reserved space if it fits. options MD_ROOT_SIZE=10 # Make the md device a potential root device, either with preloaded Index: sys/conf/kern.post.mk =================================================================== --- sys/conf/kern.post.mk +++ sys/conf/kern.post.mk @@ -130,6 +130,9 @@ @rm -f ${.TARGET} @echo linking ${.TARGET} ${SYSTEM_LD} +.if !empty(MD_ROOT_SIZE_CONFIGURED) && defined(MFS_IMAGE) + @sh ${S}/tools/embed_mfs.sh ${.TARGET} ${MFS_IMAGE} +.endif .if ${MK_CTF} != "no" @echo ${CTFMERGE} ${CTFFLAGS} -o ${.TARGET} ... @${CTFMERGE} ${CTFFLAGS} -o ${.TARGET} ${SYSTEM_OBJS} vers.o @@ -333,6 +336,7 @@ ${AWK} -f $S/tools/vnode_if.awk $S/kern/vnode_if.src -q .if ${MFS_IMAGE:Uno} != "no" +.if empty(MD_ROOT_SIZE_CONFIGURED) # Generate an object file from the file system image to embed in the kernel # via linking. Make sure the contents are in the mfs section and rename the # start/end/size variables to __start_mfs, __stop_mfs, and mfs_size, @@ -352,6 +356,7 @@ _binary_${MFS_IMAGE:C,[^[:alnum:]],_,g}_end=mfs_root_end \ ${.TARGET} .endif +.endif # XXX strictly, everything depends on Makefile because changes to ${PROF} # only appear there, but we don't handle that. Index: sys/conf/kern.pre.mk =================================================================== --- sys/conf/kern.pre.mk +++ sys/conf/kern.pre.mk @@ -195,9 +195,13 @@ SYSTEM_OBJS= locore.o ${MDOBJS} ${OBJS} SYSTEM_OBJS+= ${SYSTEM_CFILES:.c=.o} SYSTEM_OBJS+= hack.So + +MD_ROOT_SIZE_CONFIGURED!= grep MD_ROOT_SIZE opt_md.h || true ; echo .if ${MFS_IMAGE:Uno} != "no" +.if empty(MD_ROOT_SIZE_CONFIGURED) SYSTEM_OBJS+= embedfs_${MFS_IMAGE:T:R}.o .endif +.endif SYSTEM_LD= @${LD} -Bdynamic -T ${LDSCRIPT} ${_LDFLAGS} --no-warn-mismatch \ --warn-common --export-dynamic --dynamic-linker /red/herring \ -o ${.TARGET} -X ${SYSTEM_OBJS} vers.o @@ -230,8 +234,9 @@ # Architecture and output format arguments for objdump to convert image to # object file -.if ${MFS_IMAGE:Uno} != "no" +.if ${MFS_IMAGE:Uno} != "no" +.if empty(MD_ROOT_SIZE_CONFIGURED) .if !defined(EMBEDFS_FORMAT.${MACHINE_ARCH}) EMBEDFS_FORMAT.${MACHINE_ARCH}!= awk -F'"' '/OUTPUT_FORMAT/ {print $$2}' ${LDSCRIPT} .if empty(EMBEDFS_FORMAT.${MACHINE_ARCH}) @@ -253,6 +258,7 @@ EMBEDFS_FORMAT.mips64?= elf64-tradbigmips EMBEDFS_FORMAT.mips64el?= elf64-tradlittlemips .endif +.endif # Detect kernel config options that force stack frames to be turned on. DDB_ENABLED!= grep DDB opt_ddb.h || true ; echo Index: sys/dev/md/md.c =================================================================== --- sys/dev/md/md.c +++ sys/dev/md/md.c @@ -130,18 +130,12 @@ */ #if defined(MD_ROOT_SIZE) /* + * We put the mfs_root symbol into the oldmfs section of the kernel object file. * Applications that patch the object with the image can determine - * the size looking at the start and end markers (strings), - * so we want them contiguous. + * the size looking at the oldmfs section size within the kernel. */ -static struct { - u_char start[MD_ROOT_SIZE*1024]; - u_char end[128]; -} mfs_root = { - .start = "MFS Filesystem goes here", - .end = "MFS Filesystem had better STOP here", -}; -const int mfs_root_size = sizeof(mfs_root.start); +u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs"))); +const int mfs_root_size = sizeof(mfs_root); #else extern volatile u_char __weak_symbol mfs_root; extern volatile u_char __weak_symbol mfs_root_end; Index: sys/tools/embed_mfs.sh =================================================================== --- sys/tools/embed_mfs.sh +++ sys/tools/embed_mfs.sh @@ -32,8 +32,20 @@ # $2: MFS image filename # -obs=`strings -at d $1 | grep "MFS Filesystem goes here" | awk '{print $1}'` -dd if=$2 ibs=8192 of=$1 obs=${obs} oseek=1 conv=notrunc 2> /dev/null +mfs_size=`stat -f '%z' $2 2> /dev/null` +# If we can't determine MFS image size - bail. +[ -z ${mfs_size} ] && echo "Can't determine MFS image size" && exit 1 -strings $1 | grep 'MFS Filesystem had better STOP here' > /dev/null || \ - (rm $1 && echo "MFS image too large" && false) +sec_info=`objdump -h $1 2> /dev/null | grep " oldmfs "` +# If we can't find the mfs section within the given kernel - bail. +[ -z "${sec_info}" ] && echo "Can't locate mfs section within kernel" && exit 1 + +sec_size=`echo ${sec_info} | awk '{printf("%d", "0x" $3)}' 2> /dev/null` +sec_start=`echo ${sec_info} | awk '{printf("%d", "0x" $6)}' 2> /dev/null` + +# If the mfs section size is smaller than the mfs image - bail. +[ ${sec_size} -lt ${mfs_size} ] && echo "MFS image too large" && exit 1 + +# Dump the mfs image into the mfs section +dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \ + echo "MFS image embedded into kernel" && exit 0