From 7146c13e4371ca3a01d2c829771c3e6edb171adb Mon Sep 17 00:00:00 2001
From: Julian Elischer <julian@FreeBSD.org>
Date: Tue, 28 Nov 1995 09:42:06 +0000
Subject: the second set of changes in a move towards getting devices to be
 totally dynamic.

this is only the devices in i386/isa
I'll do more tomorrow.
they're completely masked by #ifdef JREMOD at this stage...
the eventual aim is that every driver will do a SYSINIT
at startup BEFORE the probes, which will effectively
link it into the devsw tables etc.

If I'd thought about it more I'd have put that in in this set (damn)
The ioconf lines generated by config will also end up in the
device's own scope as well, so ioconf.c will eventually be gutted
the SYSINIT call to the driver will include a phase where the
driver links it's ioconf line into a chain of such. when this phase is done
then the user can modify them with the boot: -c
config menu if he wants, just like now..
config will put the config lines out in the .h file
(e.g. in aha.h will be the addresses for the aha driver to look.)
as I said this is a very small first step..
the aim of THIS set of edits is to not have to edit conf.c at all when
adding a new device.. the tabe will be a simple skeleton..

when this is done, it will allow other changes to be made,
all teh time still having a fully working kernel tree,
but the logical outcome is the complete REMOVAL of the devsw tables.

By the end of this, linked in drivers will be exactly the same as
run-time loaded drivers, except they JUST HAPPEN to already be linked
and present at startup..
the SYSINIT calls will be the equivalent of the "init" call
made to a newly loaded driver in every respect.

For this edit,
each of the files has the following code inserted into it:

obviously, tailored to suit..
----------------------somewhere at the top:
#ifdef JREMOD
#include <sys/conf.h>
#define CDEV_MAJOR 13
#define BDEV_MAJOR 4
static void 	sd_devsw_install();
#endif /*JREMOD */
---------------------somewhere that's run during bootup: EVENTUALLY a SYSINIT
#ifdef JREMOD
        sd_devsw_install();
#endif /*JREMOD*/
-----------------------at the bottom:
#ifdef JREMOD
struct bdevsw sd_bdevsw =
	{ sdopen,	sdclose,	sdstrategy,	sdioctl,	/*4*/
	  sddump,	sdsize,		0 };

struct cdevsw sd_cdevsw =
	{ sdopen,	sdclose,	rawread,	rawwrite,	/*13*/
	  sdioctl,	nostop,		nullreset,	nodevtotty,/* sd */
	  seltrue,	nommap,		sdstrategy };

static sd_devsw_installed = 0;

static void 	sd_devsw_install()
{
	dev_t descript;
	if( ! sd_devsw_installed ) {
		descript = makedev(CDEV_MAJOR,0);
		cdevsw_add(&descript,&sd_cdevsw,NULL);
#if defined(BDEV_MAJOR)
		descript = makedev(BDEV_MAJOR,0);
		bdevsw_add(&descript,&sd_bdevsw,NULL);
#endif /*BDEV_MAJOR*/
		sd_devsw_installed = 1;
	}
}
#endif /* JREMOD */
---
 sys/i386/isa/cy.c | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

(limited to 'sys/i386/isa/cy.c')

diff --git a/sys/i386/isa/cy.c b/sys/i386/isa/cy.c
index ce0816c4b709..c2f37255f90c 100644
--- a/sys/i386/isa/cy.c
+++ b/sys/i386/isa/cy.c
@@ -27,7 +27,7 @@
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: cy.c,v 1.18 1995/11/04 17:07:14 bde Exp $
+ *	$Id: cy.c,v 1.19 1995/11/26 17:13:23 bde Exp $
  */
 
 #include "cy.h"
@@ -397,6 +397,11 @@ static	int	cy_nr_cd1400s[NCY];
 #undef	RxFifoThreshold
 static	int	volatile RxFifoThreshold = (CD1400_RX_FIFO_SIZE / 2);
 
+#ifdef JREMOD
+#define CDEV_MAJOR 48
+static void 	cy_devsw_install();
+#endif /*JREMOD*/
+
 static struct kern_devconf kdc_sio[NCY] = { {
 	0, 0, 0,		/* filled in by dev_attach */
 	"cyc", 0, { MDDT_ISA, 0, "tty" },
@@ -437,6 +442,10 @@ sioprobe(dev)
 		return (0);
 	cy_nr_cd1400s[unit] = 0;
 	sioregisterdev(dev);
+#ifdef JREMOD
+        cy_devsw_install();
+#endif /*JREMOD*/
+
 
 	/* Cyclom-16Y hardware reset (Cyclom-8Ys don't care) */
 	cy_inb(iobase, CY16_RESET);	/* XXX? */
@@ -2511,4 +2520,27 @@ cystatus(unit)
 }
 #endif /* CyDebug */
 
+
+#ifdef JREMOD
+struct cdevsw cy_cdevsw = 
+	{ cyopen,	cyclose,	cyread,		cywrite,	/*48*/
+	  cyioctl,	cystop,		nxreset,	cydevtotty,/*cyclades*/
+	  ttselect,	nxmmap,		NULL };
+
+static cy_devsw_installed = 0;
+
+static void 	cy_devsw_install()
+{
+	dev_t descript;
+	if( ! cy_devsw_installed ) {
+		descript = makedev(CDEV_MAJOR,0);
+		cdevsw_add(&descript,&cy_cdevsw,NULL);
+#if defined(BDEV_MAJOR)
+		descript = makedev(BDEV_MAJOR,0);
+		bdevsw_add(&descript,&cy_bdevsw,NULL);
+#endif /*BDEV_MAJOR*/
+		cy_devsw_installed = 1;
+	}
+}
+#endif /* JREMOD */
 #endif /* NCY > 0 */
-- 
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