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For example, to build the DEBUG configuration, instead of typing To compile an alternate kernel configuration, you should follow the same basic procedure as outlined previously, changing the final make statement slightly. It is also useful for debugging low-level interrupt handler routines that cannot be debugged by using the more traditional gdb. The ddb debugger is helpful to debug panics that occur early in boot or within certain parts of the Ethernet driver.

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The DEBUG configuration enables ddb, the in-kernel serial debugger. Compiling a kernel without specifying a configuration results in the RELEASE configuration being built. The release configuration should be the same as a stock Apple-released kernel, so this is interesting only if you are building source that differs from that which was used to build the kernel you are already running. The most useful and interesting configurations are RELEASE and DEBUG. These configurations add various additional options (except PROFILE, which is reserved for future expansion, and currently maps onto RELEASE). Additional configurations are RELEASE_TRACE, DEBUG, DEBUG_TRACE, and PROFILE. When building a kernel, you may want to build a configuration other than the RELEASE configuration (the default shipping configuration). Building an Alternate Kernel Configuration If things don’t work, the darwin-kernel mailing list a good place to get help. For example, if your module is called mach_foo, you should then add a new option line near the top of files that is whitespace (space or tab) delimited and looks like this:Īnd get a working kernel in BUILD/obj/RELEASE_PPC/mach_kernel (assuming you are building a RELEASE kernel for PowerPC, of course). If you are adding a new module, you should first choose a name for that module. The format for these two files is relatively straightforward. These are supplemented by files, files.ppc, and files.i386, which contain associations between compile options and the files that are related to them for their respective architectures. The files MASTER, MASTER.ppc, and MASTER.i386 contain the list of configuration options that should be built into the kernel for all architectures, PowerPC, and i386, respectively. In the appropriate conf directory, you need to add your files or modules into various files.

The first describes adding the module itself and the second describes enabling the module. This section is divided into two subsections. In either case, the procedure is basically the same, just in a different directory. For the BSD portion of the kernel, you should list it in various files in xnu/bsd/conf. If you are adding a new file or module into the Mach portion of the kernel, you need to list it in various files in xnu/osfmk/conf. The details of adding a new file or module into the kernel differ according to what portion of the kernel contains the file.

XNOTE TIMER PROBLEM HOW TO

This section describes how to add additional files that will be compiled into the kernel, including how to add a new config option for an additional module. It does not refer to loadable modules (KEXTs). In this context, the term module is used loosely to refer to a collection of related files in the kernel that are controlled by a single config option at compile time. This is a must-read for anyone doing kernel development. The third section, When Things Go Wrong: Debugging the Kernel, tells how to debug a kernel or kernel module using ddb and gdb. The second section, Building Your First Kernel, describes how to build a kernel, including how to build a kernel with debugger support, how to add new options, and how to obtain sources that are of similar vintage to those in a particular version of OS X or Darwin. You should only add files into the kernel when the use of a KEXT is not possible (for example, when adding certain low-level motherboard hardware support). The first, Adding New Files or Modules, describes how to add new functionality into the kernel itself. The discussion is divided into three sections. This chapter is about adding new in-kernel modules (optional parts of the kernel), building kernels, and debugging kernel and kernel extension builds. There are a number of good KEXT tutorial s on Apple’s developer documentation site ( ). This chapter is not about building kernel extensions (KEXTs). Next Previous Building and Debugging Kernels

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