FreeBSD Device Drivers A Guide for the Intrepid by Joseph Kong

FreeBSD Device Drivers A Guide for the Intrepid by Joseph Kong

By Joseph Kong

Equipment drivers ensure that your software program to speak together with your undefined, and since each working process has particular requisites, motive force writing is nontrivial. whilst constructing for FreeBSD, youve most likely needed to scour the net and dig in the course of the kernel resources to determine the right way to write the drivers you would like. fortunately, that forestalls now. In FreeBSD machine Drivers, Joseph Kong will educate you ways to grasp every little thing from the fundamentals of establishing and operating loadable kernel modules to extra complex issues like thread synchronization. After a crash direction within the diversified FreeBSD driving force frameworks, large educational sections dissect real-world drivers just like the parallel port printer driving force. Youll examine: All approximately Newbus, the infrastructure utilized by FreeBSD to regulate the units in your process tips to paintings with ISA, PCI, USB, and different buses the easiest how one can keep an eye on and converse with the units from person area how you can use Direct reminiscence entry (DMA) for max procedure functionality the internal workings of the digital null modem terminal driving force, the USB printer driving force, the Intel PCI Gigabit Ethernet adapter driving force, and different vital drivers the best way to use universal entry procedure (CAM) to regulate host bus adapters (HBAs) Concise descriptions and huge annotations stroll you thru the various code examples. Dont waste time looking guy pages or digging throughout the kernel assets to determine the way to make that arcane little bit of paintings along with your process. FreeBSD equipment Drivers offers the framework you should write any motive force you will want, now.

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X. 2 Listing 2-1 should clarify any misunderstandings you may have about MALLOC_DEFINE and MALLOC_DECLARE. 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. h> #define BUFFER_SIZE 256  MALLOC_DECLARE(M_ECHO);  MALLOC_DEFINE(M_ECHO, "echo_buffer", "buffer for echo driver"); static static static static d_open_t d_close_t d_read_t d_write_t echo_open; echo_close; echo_read; echo_write; 2. c. 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) { ...

Note that uiomove decrements uio->uio_resid (by one) and increments uio->uio_offset (by one) for each byte copied. This lets multiple calls to uiomove effortlessly copy a chunk of data. 34 Chapter 3 NOTE You’ll recall that uio->uio_resid and uio->uio_offset denote the number of bytes remaining to be transferred and an offset into the data (that is, the character string), respectively. This function starts by  determining the number of bytes to copy—either the  amount the user sent or  whatever the buffer can accommodate.

Ko, as shown here: $ make Warning: Object directory not changed from original /usr/home/ghost/hello @ -> /usr/src/sys machine -> /usr/src/sys/i386/include cc -O2 -fno-strict-aliasing -pipe -D_KERNEL -DKLD_MODULE -std=c99 -nostdinc -I. ko Hello, world! ko Good-bye, cruel world! ko Hello, world! ko, id=3 Good-bye, cruel world! Congratulations! You’ve now successfully loaded code into a live kernel. Before moving on, one additional point is also worth mentioning. ko As you can see, the output is pretty self-explanatory.

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