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Darwin 0.2 Driver Kit

		notes on integrating kern_dev server
		
What Jim did:

* option in Makefile.m68k is udma

* changes to kernel:

  * syscall_sw.c:
  	#if UDMA
		FN(device_master_self, 0),		/* 69 */
	#else
		FN(kern_invalid, 0),			/* 69 */
	#endif

  * add a call to ipc_dev_init() (one-time only init for kern_dev server,
    in kern_dev.c) in mach_init.c
    
  * disabled the simple lock assertion in simple_lock_try (WHY???)
  
  * Add DEVICE_PRIV_TRAP to kern/ipc_ptraps.c
  
  * ipc_basic.c:
  
  	#if UDMA
	if (!dev_server_server(&kmsgptr->kmsg_header, &out_msg->kmsg_header))
	#endif

What I have to do:

* Move everything except for the mig stuff from driverkit/m88k into the 
  kernel. There's no reason for it to be outside.
  --DONE
  
* one-time only init function in kern_dev_priv. Runs before libIO is init'd.

  -- create device_master_port using port_alloc
  -- the rest of the stuff in autoconfig_int. This function which does the
     one-time only init should be in kern_dev_priv so it's not 
     KERNEL_FEATURES.
     
  ...DONE
  
* at autoconfig time (autoconf_int())
    -- IOLibInit()
    -- object_copyout() device_master_port to device_master_uport. This 
       should be a static in autoconf!
    -- in an IOTask thread, do
	    -- autosize_bus()
	    -- probe_drivers
    ...DONE
      
* autosize_bus needs to create kern_dev_t's for hard-wired devices (adb
  and frame buffer). Enumerate these neatly somehow.
  ...DONE
  
* for test, call do_autoconf() from init_main. Maybe later from a loaded
  server.
  
* Initialization sequeuence as of 2 Nov
  dev_server_init() - end of setup_main() in kern/mach_init.c
  objcInit() - main() in bsd/kern/init_main
  do_autoconf() - just after objcInit(), before vfs_mountroot
  
  currently, setup_main() calls startup() early on, and this calls 
  configure()...
  
testing libdriver in the 68k kernel

* configuration = LIBDRV, enables:
	kernobjc
	objctest
	driverdbg
	udma
	xpr_debug
	
  setup_main() in kern/mach_init.c
	dev_server_init()
  		xprInit()
  main() in init_main.c
  	_objcInit() 
	autoconf()         (before mounting root)
	    IOlibIOInit()
	    fork off iotaskTest() in Kernel/libIO.m
	    config FAKE_DEVICE (defined in kern_dev_priv.h)
	  
Configuring w/FAKE_DEVICE true:
	kernIOAttachInterrupt: avoids setting up h/w global_intr_map register
	kernIOMapDevicePage: static fake device page for mapping
	dev_intr_detach_com: avoid clearing global_intr_map
	
testing
	objtest.m has NXlock test, kernel version. Invoked via loadable
		server klibtest (in driverkit/tests), which calls
		doNXLockTest.
	IOLibIOInit forks off iotaskTest() in Kernel/libIO.m, tests 
		mach functions.
	dev_serv_test in driverkit/tests does half of Config's job,
		doing IOGetDeviceType(), IOCreateDevicePort(), etc. for
		each device known by kernel, and prints everything it 
		finds.
		
	    
  

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