FreeBSD Device Drivers A Guide for the Intrepid by Joseph Kong

By Joseph Kong

Equipment drivers be sure that your software program to speak together with your undefined, and since each working approach has particular specifications, motive force writing is nontrivial. while constructing for FreeBSD, youve most likely needed to scour the web and dig during the kernel assets to determine tips on how to write the drivers you wish. fortunately, that prevents now. In FreeBSD equipment Drivers, Joseph Kong will educate you the way to grasp every little thing from the fundamentals of establishing and working loadable kernel modules to extra complex issues like thread synchronization. After a crash direction within the assorted FreeBSD motive force frameworks, huge instructional sections dissect real-world drivers just like the parallel port printer motive force. Youll research: All approximately Newbus, the infrastructure utilized by FreeBSD to control the units in your procedure the way to paintings with ISA, PCI, USB, and different buses the simplest how one can keep watch over and converse with the units from consumer area the way to use Direct reminiscence entry (DMA) for optimum process functionality the internal workings of the digital null modem terminal driving force, the USB printer motive force, the Intel PCI Gigabit Ethernet adapter motive force, and different very important drivers the best way to use universal entry technique (CAM) to regulate host bus adapters (HBAs) Concise descriptions and wide annotations stroll you thru the numerous code examples. Dont waste time looking out guy pages or digging in the course of the kernel resources to determine the best way to make that arcane little bit of paintings along with your process. FreeBSD equipment Drivers offers the framework that you have to write any driving force you will want, now.

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Moreover, struct echo was adjusted to include a variable ( buffer_size) to maintain the buffer size (because it can be changed now). Naturally, Listing 3-1 was   altered to use this new variable. NOTE Interestingly, only echo_write had to be altered. The echo_open, echo_close, and echo_read functions remain the same. The echo_write, echo_set_buffer_size, echo_ioctl, and echo_modevent functions call for a more in-depth explanation and are therefore described in their own sections. echo_write Function As mentioned above, the echo_write function was altered from its Listing 2-1 (and Listing 1-2) form.

Listing 2-2 should clarify any misunderstandings you may have about contigmalloc and contigfree. NOTE To save space, the functions echo_open, echo_close, echo_write, and echo_read aren’t listed here, as they haven’t been changed. d_name = "echo" }; typedef struct echo { char buffer[BUFFER_SIZE]; int length; } echo_t; static echo_t *echo_message; static struct cdev *echo_dev; static int echo_open(struct cdev *dev, int oflags, int devtype, struct thread *td) { ... } static int echo_close(struct cdev *dev, int fflag, int devtype, struct thread *td) { ...

But they don’t have to be consecutive. You can leave gaps. Lastly, note that you can pass  structures as the t argument. Using a structure is how you’ll pass multiple arguments to an ioctl-based operation. Implementing ioctl Listing 3-1 is a revision of Listing 2-1 that adds in a d_ioctl function. As you’ll see, this d_ioctl function handles two ioctl commands. NOTE Take a quick look at this code and try to discern some of its structure. If you don’t understand all of it, don’t worry; an explanation follows.

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