qemuboot.bbclass: add it for runqemu

It saves vars in ${DEPLOY_DIR_IMAGE}/<image>.qemuboot.conf, and runqemu
will read it.

The bsp which can be boot by runqemu will inherit it.

(From OE-Core rev: 1675e9b89e00b875d0da13411a2a939aa4ba5298)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/qemuboot.bbclass

@@ -0,0 +1,75 @@
+# Help runqemu boot target board, "QB" means Qemu Boot, the following
+# vars can be set in conf files, such as <bsp.conf> to make it can be
+# boot by runqemu:
+#
+# QB_SYSTEM_NAME: qemu name, e.g., "qemu-system-i386"
+# QB_OPT_APPEND: options to append to qemu, e.g., "-show-cursor"
+# QB_DEFAULT_KERNEL: default kernel to boot, e.g., "bzImage"
+# QB_DEFAULT_FSTYPE: default FSTYPE to boot, e.g., "ext4"
+# QB_MEM: memory, e.g., "-m 512"
+# QB_MACHINE: qemu machine, e.g., "-machine virt"
+# QB_CPU: qemu cpu, e.g., "-cpu qemu32"
+# QB_CPU_KVM: the similar to QB_CPU, but used when kvm, e.g., '-cpu kvm64',
+#             set it when support kvm.
+# QB_KERNEL_CMDLINE_APPEND: options to append to kernel's -append
+#                           option, e.g., "console=ttyS0 console=tty"
+# QB_DTB: qemu dtb name
+# QB_AUDIO_DRV: qemu audio driver, e.g., "alsa", set it when support audio
+# QB_AUDIO_OPT: qemu audio option, e.g., "-soundhw ac97,es1370", used
+#               when QB_AUDIO_DRV is set.
+# QB_KERNEL_ROOT: kernel's root, e.g., /dev/vda
+# QB_TAP_OPT: netowrk option for 'tap' mode, e.g.,
+#             "-netdev tap,id=net0,ifname=@TAP@,script=no,downscript=no -device virtio-net-device,netdev=net0"
+#              Note, runqemu will replace "@TAP@" with the one which is used, such as tap0, tap1 ...
+# QB_SLIRP_OPT: network option for SLIRP mode, e.g.,
+#             "-netdev user,id=net0 -device virtio-net-device,netdev=net0"
+# QB_ROOTFS_OPT: used as rootfs, e.g.,
+#               "-drive id=disk0,file=@ROOTFS@,if=none,format=raw -device virtio-blk-device,drive=disk0"
+#              Note, runqemu will replace "@ROOTFS@" with the one which is used, such as core-image-minimal-qemuarm64.ext4.
+# QB_SERIAL_OPT: serial port, e.g., "-serial mon:stdio"
+# QB_TCPSERIAL_OPT: tcp serial port option, e.g.,
+#                   " -device virtio-serial-device -chardev socket,id=virtcon,port=@PORT@,host=127.0.0.1 -device virtconsole,chardev=virtcon"
+#                   Note, runqemu will replace "@PORT@" with the port number which is used.
+#
+# Usage:
+# IMAGE_CLASSES += "qemuboot"
+# See "runqemu help" for more info
+
+QB_MEM ?= "-m 256"
+QB_SERIAL_OPT ?= "-serial mon:stdio -serial null"
+QB_DEFAULT_KERNEL ?= "${KERNEL_IMAGETYPE}"
+QB_DEFAULT_FSTYPE ?= "ext4"
+QB_OPT_APPEND ?= "-show-cursor"
+
+# Create qemuboot.conf
+ROOTFS_POSTPROCESS_COMMAND += "write_qemuboot_conf; "
+
+python write_qemuboot_conf() {
+    import configparser
+
+    build_vars = ['MACHINE', 'TUNE_ARCH', 'DEPLOY_DIR_IMAGE', \
+                'IMAGE_NAME', 'IMAGE_LINK_NAME', 'STAGING_DIR_NATIVE', \
+                'STAGING_BINDIR_NATIVE', 'STAGING_DIR_HOST']
+
+    # Vars from bsp
+    qb_vars = []
+    for k in d.keys():
+        if k.startswith('QB_'):
+            qb_vars.append(k)
+
+    qemuboot = "%s/%s.qemuboot.conf" % (d.getVar('DEPLOY_DIR_IMAGE', True), d.getVar('IMAGE_NAME', True))
+    qemuboot_link = "%s/%s.qemuboot.conf" % (d.getVar('DEPLOY_DIR_IMAGE', True), d.getVar('IMAGE_LINK_NAME', True))
+    cf = configparser.ConfigParser()
+    cf.add_section('config_bsp')
+    for k in build_vars + qb_vars:
+        cf.set('config_bsp', k, '%s' % d.getVar(k, True))
+    with open(qemuboot, 'w') as f:
+        cf.write(f)
+
+    if d.getVar('RM_OLD_IMAGE', True) == "1" and os.path.exists(qemuboot_link):
+       os.remove(os.path.realpath(qemuboot_link))
+
+    if os.path.lexists(qemuboot_link):
+       os.remove(qemuboot_link)
+    os.symlink(os.path.basename(qemuboot), qemuboot_link)
+}