1 files changed, 413 insertions, 0 deletions

diff --git a/meta/classes/kernel-yocto.bbclass b/meta/classes/kernel-yocto.bbclass
new file mode 100644
index 0000000000..8f79932438
--- /dev/null
+++ b/meta/classes/kernel-yocto.bbclass
@@ -0,0 +1,413 @@
+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}" )}"
+
+        # 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
+                echo "ERROR. Could not create ${machine_branch}"
+                exit 1
+        fi
+
+        sccs="${@" ".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}/$f"
+                fi
+            done
+        fi
+
+        if [ "${machine_branch}" != "${KBRANCH_DEFAULT}" ]; then
+                updateme_flags="--branch ${machine_branch}"
+        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
+                echo "ERROR. Could not update ${machine_branch}"
+                exit 1
+        fi
+
+        # executes and modifies the source tree as required
+        patchme ${KMACHINE}
+        if [ $? -ne 0 ]; then
+                echo "ERROR. Could not apply patches for ${KMACHINE}."
+                echo "       Patch failures can be resolved in the devshell (bitbake -c devshell ${PN})"
+                exit 1
+        fi
+
+        # Perform a final check. If something other than the default kernel
+        # branch was requested, and that's not where we ended up, then we 
+        # should thrown an error, since we aren't building what was expected
+        final_branch="$(git symbolic-ref HEAD 2>/dev/null)"
+        final_branch=${final_branch##refs/heads/}
+        if [ "${machine_branch}" != "${KBRANCH_DEFAULT}" ] &&
+           [ "${final_branch}" != "${machine_branch}" ]; then
+                echo "ERROR: branch ${machine_branch} was requested, but was not properly"
+                echo "       configured to be built. The current branch is ${final_branch}"
+                exit 1
+        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
+                        echo "[ERROR]: S is not set to the linux source directory. Check "
+                        echo "         the recipe and set S to the proper extracted subdirectory"
+                        exit 1
+                fi
+                git init
+                git add .
+                git commit -q -m "baseline commit: creating repo for ${PN}-${PV}"
+        fi
+        # end debare
+
+        # 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 branch -a | grep -q ${KMETA}
+                if [ $? -ne 0 ]; then
+                        echo "ERROR. The branch '${KMETA}' is required and was not"
+                        echo "found. Ensure that the SRC_URI points to a valid linux-yocto"
+                        echo "kernel repository"
+                        exit 1
+                fi
+        fi
+        
+        machine_branch="${@ get_machine_branch(d, "${KBRANCH}" )}"
+
+        if [ "${KBRANCH}" != "${machine_branch}" ]; then
+                echo "WARNING: The SRC_URI machine branch and KBRANCH are not the same."
+                echo "         KBRANCH will be adjusted to match, but this typically is a"
+                echo "         misconfiguration and should be checked."
+        fi
+
+        # convert any remote branches to local tracking ones
+        for i in `git branch -a | 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 $i > /dev/null
+                fi
+        done
+
+        # Create a working tree copy of the kernel by checking out a branch
+        git show-ref --quiet --verify -- "refs/heads/${machine_branch}"
+        if [ $? -eq 0 ]; then
+                # checkout and clobber any unimportant files
+                git checkout -f ${machine_branch}
+        else
+                echo "Not checking out ${machine_branch}, it will be created later"
+                git checkout -f master
+        fi
+}
+do_kernel_checkout[dirs] = "${S}"
+
+addtask kernel_checkout before do_patch after do_unpack
+
+do_kernel_configme[dirs] = "${S} ${B}"
+do_kernel_configme() {
+        echo "[INFO] doing kernel configme"
+        export KMETA=${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
+                echo "ERROR. Could not configure ${KMACHINE}-${LINUX_KERNEL_TYPE}"
+                exit 1
+        fi
+        
+        echo "# Global settings from linux recipe" >> ${B}/.config
+        echo "CONFIG_LOCALVERSION="\"${LINUX_VERSION_EXTENSION}\" >> ${B}/.config
+}
+
+python do_kernel_configcheck() {
+    import re, string, sys
+
+    bb.plain("NOTE: validating kernel config, see log.do_kernel_configcheck for details")
+
+    # if KMETA isn't set globally by a recipe using this routine, we need to
+    # set the default to 'meta'. Otherwise, kconf_check is not passed a valid
+    # meta-series for processing
+    kmeta = d.getVar( "KMETA", True ) or "meta"
+    if not os.path.exists(kmeta):
+        kmeta = "." + kmeta
+
+    pathprefix = "export PATH=%s:%s; " % (d.getVar('PATH', True), "${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() {
+        cd ${S}
+        export KMETA=${KMETA}
+
+        machine_branch="${@ get_machine_branch(d, "${KBRANCH}" )}"
+
+        set +e
+        # if SRCREV is AUTOREV it shows up as AUTOINC there's nothing to
+        # check and we can exit early
+        if [ "${SRCREV_machine}" = "AUTOINC" ] || [ "${SRCREV_machine}" = "INVALID" ] ||
+           [ "${SRCREV_machine}" = "" ]; then
+                return
+        fi
+
+        # If something other than the default branch was requested, it must
+        # exist in the tree, and it's a hard error if it wasn't
+        git show-ref --quiet --verify -- "refs/heads/${machine_branch}"
+        if [ $? -eq 1 ]; then
+                if [ -n "${KBRANCH_DEFAULT}" ] && 
+                      [ "${machine_branch}" != "${KBRANCH_DEFAULT}" ]; then
+                        echo "ERROR: branch ${machine_branch} was set for kernel compilation, "
+                        echo "       but it does not exist in the kernel repository."
+                        echo "       Check the value of KBRANCH and ensure that it describes"
+                        echo "       a valid banch in the source kernel repository"
+                        exit 1
+                fi
+        fi
+
+        if [ -z "${SRCREV_machine}" ]; then
+                target_branch_head="${SRCREV}"
+        else
+                target_branch_head="${SRCREV_machine}"
+        fi
+
+        # $SRCREV could have also been AUTOINC, so check again
+        if [ "${target_branch_head}" = "AUTOINC" ]; then
+                return
+        fi
+
+        ref=`git show ${target_branch_head} 2>&1 | head -n1 || true`
+        if [ "$ref" = "fatal: bad object ${target_meta_head}" ]; then
+            echo "ERROR ${target_branch_head} is not a valid commit ID."
+            echo "The kernel source tree may be out of sync"
+            exit 1
+        fi
+
+        containing_branches=`git branch --contains $target_branch_head | sed 's/^..//'`
+        if [ -z "$containing_branches" ]; then
+                echo "ERROR: SRCREV was set to \"$target_branch_head\", but no branches"
+                echo "       contain this commit"
+                exit 1
+        fi
+
+        # force the SRCREV in each branch that contains the specified
+        # SRCREV (if it isn't the current HEAD of that branch)
+        git checkout -q master
+        for b in $containing_branches; do
+                branch_head=`git show-ref -s --heads ${b}`              
+                if [ "$branch_head" != "$target_branch_head" ]; then
+                        echo "[INFO] Setting branch $b to ${target_branch_head}"
+                        if [ "$b" = "master" ]; then
+                                git reset --hard $target_branch_head > /dev/null
+                        else
+                                git branch -D $b > /dev/null
+                                git branch $b $target_branch_head > /dev/null
+                        fi
+                fi
+        done
+
+        ## KMETA branch validation
+        meta_head=`git show-ref -s --heads ${KMETA}`
+        target_meta_head="${SRCREV_meta}"
+        git show-ref --quiet --verify -- "refs/heads/${KMETA}"
+        if [ $? -eq 1 ]; then
+                return
+        fi
+
+        if [ "${target_meta_head}" = "AUTOINC" ]; then
+                return
+        fi
+
+        if [ "$meta_head" != "$target_meta_head" ]; then
+                ref=`git show ${target_meta_head} 2>&1 | head -n1 || true`
+                if [ "$ref" = "fatal: bad object ${target_meta_head}" ]; then
+                        echo "ERROR ${target_meta_head} is not a valid commit ID"
+                        echo "The kernel source tree may be out of sync"
+                        exit 1
+                else
+                        echo "[INFO] 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
+                                echo "ERROR: could not checkout ${KMETA} branch from known hash ${target_meta_head}"
+                                exit 1
+                        fi
+                fi
+        fi
+
+        git show-ref --quiet --verify -- "refs/heads/${machine_branch}"
+        if [ $? -eq 0 ]; then
+                # restore the branch for builds
+                git checkout -q -f ${machine_branch}
+        else
+                git checkout -q master
+        fi
+}
+
+# Many scripts want to look in arch/$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}"