1 files changed, 361 insertions, 0 deletions

diff --git a/meta/classes/kernel-yocto.bbclass b/meta/classes/kernel-yocto.bbclass
new file mode 100644
index 0000000000..f42a5c2534
--- /dev/null
+++ b/meta/classes/kernel-yocto.bbclass
@@ -0,0 +1,361 @@
+S = "${WORKDIR}/linux"
+
+# remove tasks that modify the source tree in case externalsrc is inherited
+SRCTREECOVEREDTASKS += "do_kernel_link_vmlinux do_kernel_configme do_validate_branches do_kernel_configcheck do_kernel_checkout do_patch"
+
+# returns local (absolute) path names for all valid patches in the
+# src_uri
+def find_patches(d):
+    patches = src_patches(d)
+    patch_list=[]
+    for p in patches:
+        _, _, local, _, _, _ = bb.fetch.decodeurl(p)
+        patch_list.append(local)
+
+    return patch_list
+
+# returns all the elements from the src uri that are .scc files
+def find_sccs(d):
+    sources=src_patches(d, True)
+    sources_list=[]
+    for s in sources:
+        base, ext = os.path.splitext(os.path.basename(s))
+        if ext and ext in [".scc", ".cfg"]:
+            sources_list.append(s)
+        elif base and base in 'defconfig':
+            sources_list.append(s)
+
+    return sources_list
+
+# check the SRC_URI for "kmeta" type'd git repositories. Return the name of
+# the repository as it will be found in WORKDIR
+def find_kernel_feature_dirs(d):
+    feature_dirs=[]
+    fetch = bb.fetch2.Fetch([], d)
+    for url in fetch.urls:
+        urldata = fetch.ud[url]
+        parm = urldata.parm
+        if "type" in parm:
+            type = parm["type"]
+        if "destsuffix" in parm:
+            destdir = parm["destsuffix"]
+            if type == "kmeta":
+                feature_dirs.append(destdir)
+            
+    return feature_dirs
+
+# find the master/machine source branch. In the same way that the fetcher proceses
+# git repositories in the SRC_URI we take the first repo found, first branch.
+def get_machine_branch(d, default):
+    fetch = bb.fetch2.Fetch([], d)
+    for url in fetch.urls:
+        urldata = fetch.ud[url]
+        parm = urldata.parm
+        if "branch" in parm:
+            branches = urldata.parm.get("branch").split(',')
+            return branches[0]
+            
+    return default
+
+do_patch() {
+        cd ${S}
+        export KMETA=${KMETA}
+
+        # if kernel tools are available in-tree, they are preferred
+        # and are placed on the path before any external tools. Unless
+        # the external tools flag is set, in that case we do nothing.
+        if [ -f "${S}/scripts/util/configme" ]; then
+                if [ -z "${EXTERNAL_KERNEL_TOOLS}" ]; then
+                        PATH=${S}/scripts/util:${PATH}
+                fi
+        fi
+
+        machine_branch="${@ get_machine_branch(d, "${KBRANCH}" )}"
+        machine_srcrev="${SRCREV_machine}"
+        if [ -z "${machine_srcrev}" ]; then
+                # fallback to SRCREV if a non machine_meta tree is being built
+                machine_srcrev="${SRCREV}"
+        fi
+
+        # if we have a defined/set meta branch we should not be generating
+        # any meta data. The passed branch has what we need.
+        if [ -n "${KMETA}" ]; then
+                createme_flags="--disable-meta-gen --meta ${KMETA}"
+        fi
+
+        createme ${createme_flags} ${ARCH} ${machine_branch}
+        if [ $? -ne 0 ]; then
+                bbfatal "Could not create ${machine_branch}"
+        fi
+
+        sccs="${@" ".join(find_sccs(d))}"
+        patches="${@" ".join(find_patches(d))}"
+        feat_dirs="${@" ".join(find_kernel_feature_dirs(d))}"
+
+        set +e
+        # add any explicitly referenced features onto the end of the feature
+        # list that is passed to the kernel build scripts.
+        if [ -n "${KERNEL_FEATURES}" ]; then
+                for feat in ${KERNEL_FEATURES}; do
+                        addon_features="$addon_features --feature $feat"
+                done
+        fi
+
+        # check for feature directories/repos/branches that were part of the
+        # SRC_URI. If they were supplied, we convert them into include directives
+        # for the update part of the process
+        if [ -n "${feat_dirs}" ]; then
+            for f in ${feat_dirs}; do
+                if [ -d "${WORKDIR}/$f/meta" ]; then
+                    includes="$includes -I${WORKDIR}/$f/meta"
+                elif [ -d "${WORKDIR}/$f" ]; then
+                    includes="$includes -I${WORKDIR}/$f"
+                fi
+            done
+        fi
+
+        # updates or generates the target description
+        updateme ${updateme_flags} -DKDESC=${KMACHINE}:${LINUX_KERNEL_TYPE} \
+                         ${includes} ${addon_features} ${ARCH} ${KMACHINE} ${sccs} ${patches}
+        if [ $? -ne 0 ]; then
+                bbfatal "Could not update ${machine_branch}"
+        fi
+
+        # executes and modifies the source tree as required
+        patchme ${KMACHINE}
+        if [ $? -ne 0 ]; then
+                bberror "Could not apply patches for ${KMACHINE}."
+                bbfatal "Patch failures can be resolved in the devshell (bitbake -c devshell ${PN})"
+        fi
+
+        # check to see if the specified SRCREV is reachable from the final branch.
+        # if it wasn't something wrong has happened, and we should error.
+        if [ "${machine_srcrev}" != "AUTOINC" ]; then
+                if ! [ "$(git rev-parse --verify ${machine_srcrev})" = "$(git merge-base ${machine_srcrev} HEAD)" ]; then
+                        bberror "SRCREV ${machine_srcrev} was specified, but is not reachable"
+                        bbfatal "Check the BSP description for incorrect branch selection, or other errors."
+                fi
+        fi
+}
+
+do_kernel_checkout() {
+        set +e
+
+        # A linux yocto SRC_URI should use the bareclone option. That
+        # ensures that all the branches are available in the WORKDIR version
+        # of the repository.
+        source_dir=`echo ${S} | sed 's%/$%%'`
+        source_workdir="${WORKDIR}/git"
+        if [ -d "${WORKDIR}/git/" ] && [ -d "${WORKDIR}/git/.git" ]; then
+                # case2: the repository is a non-bare clone
+
+                # if S is WORKDIR/git, then we shouldn't be moving or deleting the tree.
+                if [ "${source_dir}" != "${source_workdir}" ]; then
+                        rm -rf ${S}
+                        mv ${WORKDIR}/git ${S}
+                fi
+                cd ${S}
+        elif [ -d "${WORKDIR}/git/" ] && [ ! -d "${WORKDIR}/git/.git" ]; then
+                # case2: the repository is a bare clone
+
+                # if S is WORKDIR/git, then we shouldn't be moving or deleting the tree.
+                if [ "${source_dir}" != "${source_workdir}" ]; then
+                        rm -rf ${S}
+                        mkdir -p ${S}/.git
+                        mv ${WORKDIR}/git/* ${S}/.git
+                        rm -rf ${WORKDIR}/git/
+                fi
+                cd ${S} 
+                git config core.bare false
+        else
+                # case 3: we have no git repository at all. 
+                # To support low bandwidth options for building the kernel, we'll just 
+                # convert the tree to a git repo and let the rest of the process work unchanged
+                
+                # if ${S} hasn't been set to the proper subdirectory a default of "linux" is 
+                # used, but we can't initialize that empty directory. So check it and throw a
+                # clear error
+
+                cd ${S}
+                if [ ! -f "Makefile" ]; then
+                        bberror "S is not set to the linux source directory. Check "
+                        bbfatal "the recipe and set S to the proper extracted subdirectory"
+                fi
+                git init
+                git add .
+                git commit -q -m "baseline commit: creating repo for ${PN}-${PV}"
+        fi
+        # end debare
+
+        # convert any remote branches to local tracking ones
+        for i in `git branch -a --no-color | grep remotes | grep -v HEAD`; do
+                b=`echo $i | cut -d' ' -f2 | sed 's%remotes/origin/%%'`;
+                git show-ref --quiet --verify -- "refs/heads/$b"
+                if [ $? -ne 0 ]; then
+                        git branch $b $i > /dev/null
+                fi
+        done
+
+        # If KMETA is defined, the branch must exist, but a machine branch
+        # can be missing since it may be created later by the tools.
+        if [ -n "${KMETA}" ]; then
+                git show-ref --quiet --verify -- "refs/heads/${KMETA}"
+                if [ $? -eq 1 ]; then
+                        bberror "The branch '${KMETA}' is required and was not found"
+                        bberror "Ensure that the SRC_URI points to a valid linux-yocto"
+                        bbfatal "kernel repository"
+                fi
+        fi
+        
+
+        # Create a working tree copy of the kernel by checking out a branch
+        machine_branch="${@ get_machine_branch(d, "${KBRANCH}" )}"
+        git show-ref --quiet --verify -- "refs/heads/${machine_branch}"
+        if [ $? -eq 0 ]; then
+                machine_branch="master"
+        fi
+
+        # checkout and clobber any unimportant files
+        git checkout -f ${machine_branch}
+}
+do_kernel_checkout[dirs] = "${S}"
+
+addtask kernel_checkout before do_patch after do_unpack
+
+do_kernel_configme[dirs] += "${S} ${B}"
+do_kernel_configme() {
+        bbnote "kernel configme"
+        export KMETA=${KMETA}
+
+        if [ -n "${KCONFIG_MODE}" ]; then
+                configmeflags=${KCONFIG_MODE}
+        else
+                # If a defconfig was passed, use =n as the baseline, which is achieved
+                # via --allnoconfig
+                if [ -f ${WORKDIR}/defconfig ]; then
+                        configmeflags="--allnoconfig"
+                fi
+        fi
+
+        cd ${S}
+        PATH=${PATH}:${S}/scripts/util
+        configme ${configmeflags} --reconfig --output ${B} ${LINUX_KERNEL_TYPE} ${KMACHINE}
+        if [ $? -ne 0 ]; then
+                bbfatal "Could not configure ${KMACHINE}-${LINUX_KERNEL_TYPE}"
+        fi
+        
+        echo "# Global settings from linux recipe" >> ${B}/.config
+        echo "CONFIG_LOCALVERSION="\"${LINUX_VERSION_EXTENSION}\" >> ${B}/.config
+}
+
+addtask kernel_configme after do_patch
+
+python do_kernel_configcheck() {
+    import re, string, sys
+
+    bb.plain("NOTE: validating kernel config, see log.do_kernel_configcheck for details")
+
+    # if KMETA isn't set globally by a recipe using this routine, we need to
+    # set the default to 'meta'. Otherwise, kconf_check is not passed a valid
+    # meta-series for processing
+    kmeta = d.getVar( "KMETA", True ) or "meta"
+    if not os.path.exists(kmeta):
+        kmeta = "." + kmeta
+
+    pathprefix = "export PATH=%s:%s; " % (d.getVar('PATH', True), "${S}/scripts/util/")
+    cmd = d.expand("cd ${S}; kconf_check -config- %s/meta-series ${S} ${B}" % kmeta)
+    ret, result = oe.utils.getstatusoutput("%s%s" % (pathprefix, cmd))
+
+    config_check_visibility = d.getVar( "KCONF_AUDIT_LEVEL", True ) or 1
+    if config_check_visibility == 1:
+        bb.debug( 1, "%s" % result )
+    else:
+        bb.note( "%s" % result )
+}
+
+# Ensure that the branches (BSP and meta) are on the locations specified by
+# their SRCREV values. If they are NOT on the right commits, the branches
+# are corrected to the proper commit.
+do_validate_branches() {
+        set +e
+        cd ${S}
+        export KMETA=${KMETA}
+
+        machine_branch="${@ get_machine_branch(d, "${KBRANCH}" )}"
+        machine_srcrev="${SRCREV_machine}"
+
+        # if SRCREV is AUTOREV it shows up as AUTOINC there's nothing to
+        # check and we can exit early
+        if [ "${machine_srcrev}" = "AUTOINC" ]; then
+                bbnote "SRCREV validation is not required for AUTOREV"
+        elif [ "${machine_srcrev}" = "" ] && [ "${SRCREV}" != "AUTOINC" ]; then
+                # SRCREV_machine_<MACHINE> was not set. This means that a custom recipe
+                # that doesn't use the SRCREV_FORMAT "machine_meta" is being built. In
+                # this case, we need to reset to the give SRCREV before heading to patching
+                bbnote "custom recipe is being built, forcing SRCREV to ${SRCREV}"
+                force_srcrev="${SRCREV}"
+        else
+                git cat-file -t ${machine_srcrev} > /dev/null
+                if [ $? -ne 0 ]; then
+                        bberror "${machine_srcrev} is not a valid commit ID."
+                        bbfatal "The kernel source tree may be out of sync"
+                fi
+                force_srcrev=${machine_srcrev}
+        fi
+
+        ## KMETA branch validation.
+        target_meta_head="${SRCREV_meta}"
+        if [ "${target_meta_head}" = "AUTOINC" ] || [ "${target_meta_head}" = "" ]; then
+                bbnote "SRCREV validation skipped for AUTOREV or empty meta branch"
+        else
+                meta_head=`git show-ref -s --heads ${KMETA}`
+
+                git cat-file -t ${target_meta_head} > /dev/null
+                if [ $? -ne 0 ]; then
+                        bberror "${target_meta_head} is not a valid commit ID"
+                        bbfatal "The kernel source tree may be out of sync"
+                fi
+                if [ "$meta_head" != "$target_meta_head" ]; then
+                        bbnote "Setting branch ${KMETA} to ${target_meta_head}"
+                        git branch -m ${KMETA} ${KMETA}-orig
+                        git checkout -q -b ${KMETA} ${target_meta_head}
+                        if [ $? -ne 0 ];then
+                                bbfatal "Could not checkout ${KMETA} branch from known hash ${target_meta_head}"
+                        fi
+                fi
+        fi
+
+        git checkout -q -f ${machine_branch}
+        if [ -n "${force_srcrev}" ]; then
+                # see if the branch we are about to patch has been properly reset to the defined
+                # SRCREV .. if not, we reset it.
+                branch_head=`git rev-parse HEAD`
+                if [ "${force_srcrev}" != "${branch_head}" ]; then
+                        current_branch=`git rev-parse --abbrev-ref HEAD`
+                        git branch "$current_branch-orig"
+                        git reset --hard ${force_srcrev}
+                fi
+        fi
+}
+
+# Many scripts want to look in arch/$arch/boot for the bootable
+# image. This poses a problem for vmlinux based booting. This 
+# task arranges to have vmlinux appear in the normalized directory
+# location.
+do_kernel_link_vmlinux() {
+        if [ ! -d "${B}/arch/${ARCH}/boot" ]; then
+                mkdir ${B}/arch/${ARCH}/boot
+        fi
+        cd ${B}/arch/${ARCH}/boot
+        ln -sf ../../../vmlinux
+}
+
+OE_TERMINAL_EXPORTS += "GUILT_BASE KBUILD_OUTPUT"
+GUILT_BASE = "meta"
+KBUILD_OUTPUT = "${B}"
+
+python () {
+    # If diffconfig is available, ensure it runs after kernel_configme
+    if 'do_diffconfig' in d:
+        bb.build.addtask('do_diffconfig', None, 'do_kernel_configme', d)
+}