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[Cdrdao-devel] porting guide anyone? (long but concise, please help)
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From: strobe a. <ana...@ma...> - 2001-08-03 14:38:58
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Hey,
I'm interested in porting cdrdao to Darwin but there aren't many clues as=
to how exactly it works (looking at the 1.1.5 archive I decompressed).=
There is some mention that it uses the same 'SCSI library' as cdrecord, but=
to my knowledge that hasn't been ported either. Do I need to have intimate=
knowledge of cdrecord before I can port cdrdao?
I only have two CD-Rs. A working Ricoh MP7083A (ATA drive) and a=
coaster-making JVC XR-W2026 crapmatic (SCSI). I'm mostly interested in=
getting RAW DAO to work.
I can already burn various kinds of CDs on this OS using closed-source=
programs, but they don't support RAW DAO. I'm somewhat knowledgeable in how=
Darwin functions, but not at all with how cdrdao does. Is there a detailed=
description of how cdrdao communicates with the drive? How this process=
differs between OSs would probably help too.
This is basically what I know so far about the inner workings in OS X=
(without going through ridiculous detail). OS X (or Darwin, same thing in=
this context) has a well organized object-oriented driver architecture=
called IOKit or "I/O Kit". It also has a registry which is a vast hierarchy=
encompassing all hardware and drivers detected. In OS X my CD-R burner is=
recognized as an atapi device type. The atapi 'protocol transport' appears=
to manage the atapi protocol. Then, curiously, it's registered as a SCSI=
peripheral (I've read that cdrecord does something similar, but I'm not=
familiar with the reasoning or history behind this. Other ATA devices like=
hard drives are registered as ATA block devices, but the CDRW burner is=
registered as a SCSI peripheral.). It's then registered as a SCSI=
peripheral "Type05" which I speculate means a CD/DVD device. This is then=
used by a CD block storage driver and a SCSI 'task' 'initer' or "CDIniter"=
driver which I suppose notifies the system when something is inserted.
At this point there is no CD and no BSD character device etc. When you=
insert a CD a media device called "CD-R/RW RW7083A" (my Ricoh drive) is=
created which has BSD related info like the character device name, major,=
minor, block size, etc. and a device shows up on /dev/. A bunch of other=
objects are created like a CD partition scheme and a bunch of partitions=
(this CD had 9). The "Type" was also a "CD-ROM". However if I inserted a=
blank CD some of these values change like the "Type" becomes a "CD-R".
I have looked at the Darwin source code and everything corresponds. All=
this is within the scope of the public source. This means when I insert a=
blank CD with nothing but a console running (no graphical CD burning crap)=
I should get that (non-writable) BSD character device along with the=
IOMedia device (abstract media object). Unfortunately this doesn't appear=
to allow me to write blocks never mind subchannel data via RAW DAO mode.=
The way one commercial CD burning app works is to connect to a Type05 SCSI=
peripheral device nub instead of the compact disk services Thus if I'm=
burning a CD image I don't think the BSD device is ever created. The way=
another *cough* 1st party *cough* disk burning program works is to connect=
to the relatively lower-level SCSI peripheral device nub which has a=
specific Vendor, Product, Revision, etc. instead of merely a Type05, thus=
(I think) taking place of the higher-level Type05 device family. Both=
closed-source programs connect to a SCSI peripheral nub (both of which are=
open source) regardless if the drive is SCSI, ATA, USB, or FireWire.
Now if I know exactly how cdrdao works what I may be able to do is author a=
program or library which connects to the SCSI peripheral nub of the CD-R=
using that device exclusively (done using a higher probe score). Keep in=
mind I don't know much about the SCSI protocol despite using it constantly=
since 1986. I also don't know much about the RAW DAO protocol, but I do=
know a little about how CD formats work (sector areas are sync, header,=
subheader, user, auxiliary, errorflags, subchannel. CDDA uses 2352byte=
user, 294 errorflags, 96 subchannel, etc. etc.). I hope somebody on this=
list can help in those areas in which I'm clueless so I can get this thing=
to work.
The only other thing I'll mention is I could install LinuxPPC on this=
machine if that's of any help. Perhaps somebody knows cdrdao works well in=
LinuxPPC so I can test the burner (MP7083A isn't listed on your web pages).=
I guess I could also install the burner in one of my PCs, although it=
wouldn't be convenient.
Thanks for any assistance.
=46YI:
IOService hierarchy (ignore pipes and irrelevant data like power management)=
:
+-o Root <class IORegistryEntry>
+-o PowerMac3,1 <class IOPlatformExpertDevice>
+-o Core99PE <class Core99PE>
| +-o pci@f2000000 <class IOPlatformDevice>
| | +-o AppleMacRiscPCI <class AppleMacRiscPCI>
| | +-o pci-bridge@D <class IOPCIDevice>
| | +-o IOPCI2PCIBridge <class IOPCI2PCIBridge>
| | +-o mac-io@7 <class IOPCIDevice>
| | | +-o KeyLargo <class KeyLargo>
| | | +-o ata-3@20000 <class AppleMacIODevice>
| | | | +-o KeyLargoATA <class KeyLargoATA>
| | | | +-o ATADeviceNub <class ATADeviceNub>
| | | | +-o IOATAPIProtocolTransport <class IOATAPIProtocol=
Transport>
| | | | +-o IOSCSIPeripheralDeviceNub <class IOSCSIPeriph=
eralDeviceNub>
| | | | +-o IOSCSIPeripheralDeviceType05 <class IOSCSIP=
eripheralDeviceType05>
| | | | +-o IOCompactDiscServices <class IOCompactDis=
cServices>
| | | | +-o IOCDBlockStorageDriver <class IOCDBlock=
StorageDriver>
| | | | +-o SCSITaskUserClientIniter <class SCSITas=
kUserClientIniter>
| | | | +-o SCSITaskUserClient <class SCSITaskUserC=
lient>
Some details about interesting objects when inserting blank CD:
| | | | +-o ATADeviceNub <class ATADeviceNub>
| | | | | {
| | | | | "unit number" =3D 0
| | | | | "socket type" =3D "internal"
| | | | | "ata device type" =3D "atapi"
| | | | | "device serial" =3D " "
| | | | | "device revision" =3D "1.20 "
| | | | | "device model" =3D " CD-R/RW RW7083A =
"
| | | | | "IOUnit" =3D 0
| | | | | }
| | | | |
| | | | +-o IOATAPIProtocolTransport <class IOATAPIProtocol=
Transport>
| | | | | {
| | | | | "Power Management protected data" =3D "{ theNu=
mberOfPowerStates =3D 2, version 1, power state 0 =3D { capabilityFlags=
00000000, outputPowerCharacter 00000000, inputPowerRequirement 00000000,=
staticPower 0, unbudgetedPower 0, powerToAttain 0, timeToAttain 0,=
settleUpTime 0, timeToLower 0, settleDownTime 0, powerDomainBudget 0 },=
power state 1 =3D { capabilityFlags 0000c080, outputPowerCharacter=
00000002, inputPowerRequirement 00000022, staticPower 0, unbudgetedPower 0,=
powerToAttain 0, timeToAttain 0, settleUpTime 0, timeToLower 0,=
settleDownTime 0, powerDomainBudget 0 }, aggressiveness =3D 0,=
myCurrentState =3D 1, parentsCurrentPowerFlags =3D 00000022, maxCapability=
=3D 1 }"
| | | | | "IOMatchCategory" =3D "IODefaultMatchCategory"
| | | | | "IOClass" =3D "IOATAPIProtocolTransport"
| | | | | "ata device type" =3D "atapi"
| | | | | "IOProviderClass" =3D "IOATADevice"
| | | | | "IOProbeScore" =3D 0
| | | | | "CFBundleIdentifier" =3D "com.apple.iokit.IOAT=
APIProtocolTransport"
| | | | | "Power Management private data" =3D "{ this=
object =3D 02d62800, interested driver =3D 02d62800, driverDesire =3D 1,=
deviceDesire =3D 1, ourDesiredPowerState =3D 1, previousRequest =3D 98 }"
| | | | | }
| | | | |
| | | | +-o IOSCSIPeripheralDeviceNub <class IOSCSIPeriph=
eralDeviceNub>
| | | | | {
| | | | | "IOMatchCategory" =3D "SCSITaskUserClientDev=
ice"
| | | | | "Product Identification" =3D "CD-R/RW RW7083=
A"
| | | | | "IOClass" =3D "IOSCSIPeripheralDeviceNub"
| | | | | "IOProviderClass" =3D "IOSCSIProtocolService=
s"
| | | | | "IOProbeScore" =3D 0
| | | | | "Peripheral Device Type" =3D 5
| | | | | "CFBundleIdentifier" =3D "com.apple.iokit.IO=
SCSIArchitectureModelFamily"
| | | | | "Vendor Identification" =3D " D=92A=
rt=F7=ED=BFb< =91 =F7("
| | | | | "Product Revision Level" =3D "1.20"
| | | | | }
| | | | |
| | | | +-o IOSCSIPeripheralDeviceType05 <class IOSCSIP=
eripheralDeviceType05>
| | | | | {
| | | | | "CD Features" =3D 15
| | | | | "IOMatchCategory" =3D "IODefaultMatchCateg=
ory"
| | | | | "Power Management protected data" =3D "{ t=
heNumberOfPowerStates =3D 5, version 1, power state 0 =3D { capabilityFlags=
00000000, outputPowerCharacter 00000000, inputPowerRequirement 00000000,=
staticPower 0, unbudgetedPower 0, powerToAttain 0, timeToAttain 0,=
settleUpTime 0, timeToLower 0, settleDownTime 0, powerDomainBudget 0 },=
power state 1 =3D { capabilityFlags 00000000, outputPowerCharacter=
00000002, inputPowerRequirement 00000002, staticPower 0, unbudgetedPower 0,=
powerToAttain 0, timeToAttain 0, settleUpTime 0, timeToLower 0,=
settleDownTime 0, powerDomainBudget 0 }, power state 2 =3D {=
capabilityFlags 00008040, outputPowerCharacter 00000002, inputPowerRequirem=
ent 00000002, staticPower 0, unbudgetedPower 0, powerToAttain 0,=
timeToAttain 0, settleUpTime 0, timeToLower 0, settleDownTime 0,=
powerDomainBudget 0 }, power state 3 =3D { capabilityFlags 00008040, output=
PowerCharacter 00000002, inputPowerRequirement 00000002, staticPower 0,=
unbudgetedPower 0, powerToAttain 0, timeToAttain 0, settleUpTime 0,=
timeToLower 0, settleDownTime 0, powerDomainBudget 0 }, power state 4 =3D {=
capabilityFlags 0000c040, outputPowerCharacter 00000002, inputPowerRequirem=
ent 00000002, staticPower 0, unbudgetedPower 0, powerToAttain 0,=
timeToAttain 0, settleUpTime 0, timeToLower 0, settleDownTime 0,=
powerDomainBudget 0 }, aggressiveness =3D 0, myCurrentState =3D 4, parentsC=
urrentPowerFlags =3D 00000002, maxCapability =3D 4 }"
| | | | | "IOClass" =3D "IOSCSIPeripheralDeviceType0=
5"
| | | | | "IOProviderClass" =3D "IOSCSIPeripheralDev=
iceNub"
| | | | | "Peripheral Device Type" =3D 5
| | | | | "IOProbeScore" =3D 5000
| | | | | "CFBundleIdentifier" =3D "com.apple.iokit.=
IOSCSIMultimediaCommandsDevice"
| | | | | "DVD Features" =3D 0
| | | | | "Power Management private data" =3D "{=
this object =3D 02d6c300, interested driver =3D 02d6c300, driverDesire =3D=
1, deviceDesire =3D 4, ourDesiredPowerState =3D 4, previousRequest =3D 66 }=
"
| | | | | }
| | | | |
| | | | +-o IOCompactDiscServices <class IOCompactDis=
cServices>
| | | | | {
| | | | | "IOMatchCategory" =3D "SCSITaskAuthoring=
Device"
| | | | | "IOMaximumBlockCountWrite" =3D 256
| | | | | "IOMaximumSegmentCountRead" =3D 32
| | | | | "IOMaximumSegmentCountWrite" =3D 32
| | | | | "IOCFPlugInTypes" =3D {"97ABCF2C-23CC-11=
D5-A0E8-003065704866"=3D"IOSCSIArchitectureModelFamily.kext/Contents/PlugIns=
/SCSITaskUserClient.kext/Contents/PlugIns/SCSITaskLib.plugin"}
| | | | | "IOMaximumBlockCountRead" =3D 256
| | | | | "device-type" =3D "CDROM"
| | | | | "SCSITaskUserClient GUID" =3D <02d96e800=
000001913fe211e>
| | | | | "IOUserClientClass" =3D "SCSITaskUserCli=
ent"
| | | | | }
| | | | |
| | | | +-o IOCDBlockStorageDriver <class IOCDBlock=
StorageDriver>
| | | | | | {
| | | | | | "Statistics" =3D {"Bytes (Read)"=3D271=
664,"Latency Time (Write)"=3D0,"Total Time (Read)"=3D0,"Errors (Write)"=3D0,=
"Retries (Write)"=3D0,"Total Time (Write)"=3D0,"Bytes (Write)"=3D0,"Operatio=
ns (Write)"=3D0,"Operations (Read)"=3D153,"Latency Time (Read)"=3D0,"Errors=
(Read)"=3D1,"Retries (Read)"=3D0}
| | | | | | "IOMatchCategory" =3D "IODefaultMatchC=
ategory"
| | | | | | "IOClass" =3D "IOCDBlockStorageDriver"
| | | | | | "IOProviderClass" =3D "IOCDBlockStorag=
eDevice"
| | | | | | "IOPropertyMatch" =3D {"device-type"=
=3D"CDROM"}
| | | | | | "IOProbeScore" =3D 0
| | | | | | "CFBundleIdentifier" =3D "com.apple.io=
kit.IOCDStorageFamily"
| | | | | | "IOGeneralInterest" =3D ("_IOServiceIn=
terestNotifier is not serializable")
| | | | | | }
| | | | | |
| | | | | +-o D=92A rt=F7=ED=BFb< =91 =F7( CD-R/RW=
RW7083A Media <class IOCDMedia>
| | | | | | {
| | | | | | "BSD Unit" =3D 2
| | | | | | "Content" =3D ""
| | | | | | "Whole" =3D Yes
| | | | | | "BSD Minor" =3D 20
| | | | | | "Type" =3D "CD-R"
| | | | | | "Preferred Block Size" =3D 2352
| | | | | | "Ejectable" =3D Yes
| | | | | | "Writable" =3D No
| | | | | | "Size" =3D 2352
| | | | | | "TOC" =3D <00020000>
| | | | | | "BSD Name" =3D "disk2"
| | | | | | "Content Hint" =3D ""
| | | | | | "BSD Major" =3D 14
| | | | | | "Leaf" =3D Yes
| | | | | | }
| | | | | |
| | | | | +-o IOCDMediaBSDClient <class IOCDMedia=
BSDClient>
| | | | | {
| | | | | "IOMatchCategory" =3D "IOMediaBSDC=
lient"
| | | | | "IOPersonalityName" =3D "IOCDMedia=
BSDClient"
| | | | | "IOClass" =3D "IOCDMediaBSDClient"
| | | | | "IOProbeScore" =3D 31000
| | | | | "IOProviderClass" =3D "IOCDMedia"
| | | | | "CFBundleIdentifier" =3D "com.appl=
e.iokit.IOCDStorageFamily"
| | | | | "ParentKey" =3D "KEXTBundle?com.ap=
ple.iokit.IOCDStorageFamily"
| | | | | }
| | | | |
| | | | +-o SCSITaskUserClientIniter <class SCSITas=
kUserClientIniter>
| | | | | {
| | | | | "IOProviderMergeProperties" =3D {"IOCF=
PlugInTypes"=3D{"97ABCF2C-23CC-11D5-A0E8-003065704866"=3D"IOSCSIArchitecture=
ModelFamily.kext/Contents/PlugIns/SCSITaskUserClient.kext/Contents/PlugIns/S=
CSITaskLib.plugin"},"IOUserClientClass"=3D"SCSITaskUserClient"}
| | | | | "IOMatchCategory" =3D "SCSITaskAuthori=
ngDevice"
| | | | | "IOPersonalityName" =3D "CDIniter"
| | | | | "IOClass" =3D "SCSITaskUserClientInite=
r"
| | | | | "IOProviderClass" =3D "IOCompactDiscSe=
rvices"
| | | | | "IOProbeScore" =3D 0
| | | | | "CFBundleIdentifier" =3D "com.apple.io=
kit.SCSITaskUserClient"
| | | | | "ParentKey" =3D "KEXTBundle?com.apple.=
iokit.SCSITaskUserClient"
| | | | | }
| | | | |
| | | | +-o SCSITaskUserClient <class SCSITaskUserC=
lient>
| | | | {
| | | | }
| | | |
BTW what is "Leaf"?
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