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14. Common Access Method > A (Somewhat) Simple Example
Now that you’re familiar with the CAM subsystem, let’s work through some code. After that, I’ll detail the different CAM-related functions.
Example 14-1 is a SIM for a pseudo-HBA (taken from the mfi(4) code base).
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.
Example 14-1. mfi_cam.c
#include <sys/param.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/selinfo.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/bio.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_debug.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt_sim.h>
#include <cam/scsi/scsi_all.h>
#include <machine/md_var.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/mfi/mfireg.h>
#include <dev/mfi/mfi_ioctl.h>
#include <dev/mfi/mfivar.h>
#define ccb_mfip_ptr sim_priv.entries[0].ptr
struct mfip {
device_t dev;
struct mfi_softc *mfi;
....