kernel support for nix calls is gone.
it was an experiment. moving forward now.

Reference: /n/patches.lsub.org/patch/noknixcalls
Date: Sun Apr 15 14:10:45 CES 2012
Signed-off-by: nemo@lsub.org

# rm /sys/src/nix/port/devtube.c
# rm /sys/src/nix/port/nixcall.c
# rm /sys/src/nix/port/tube.h

--- /sys/src/nix/k10/k8cpufs	Thu Apr 12 12:26:27 2012
+++ /sys/src/nix/k10/k8cpufs	Sun Apr 15 13:06:59 2012
@@ -177,7 +177,6 @@
 	tod
 	syssem
 	syszio
-	nixcall
 
 #
 #dir
--- /sys/src/nix/k10/mkfile	Thu Apr 12 12:26:28 2012
+++ /sys/src/nix/k10/mkfile	Sun Apr 15 14:08:25 2012
@@ -91,8 +91,6 @@
 sdscsi.$O:	../port/error.h
 
 random.$O:	../port/error.h
-devtube.$O:	../port/tube.h
-syssem.$O: ../port/tube.h
 devacpi.$O: acpi.h
 physalloc.$O: acpi.h
 
--- /sys/src/nix/k10/k8cpu	Thu Apr 12 12:26:27 2012
+++ /sys/src/nix/k10/k8cpu	Sun Apr 15 13:13:09 2012
@@ -12,10 +12,9 @@
 	ssl
 	cap
 	kprof
-#	pmc	pmcio
+	pmc	pmcio
 	segment
 	acpi
-	tube
 	zp
 	ws
 
@@ -100,7 +99,6 @@
 	asm		'm'
 	devacpi		'C'
 	devsegment	'z'
-	devtube		'T'
 	devzp		'z'
 	hpet		'H'
 	ht		'H'
@@ -109,7 +107,6 @@
 	main		'x'
 	memory		'm'
 	mp		'M'
-	nixcall		'n'
 	page		'p'
 	pager		'p'
 	physalloc		'm'
@@ -162,7 +159,6 @@
 	fault
 	image
 	latin1
-	nixcall
 	page
 	pager
 	parse
@@ -182,6 +178,7 @@
 	syssem
 	systab
 	taslock
+#	tcklock
 	tod
 	syszio
 	syscallfmt
--- /sys/src/nix/port/portfns.h	Thu Apr 12 12:26:29 2012
+++ /sys/src/nix/port/portfns.h	Sun Apr 15 13:08:27 2012
@@ -347,7 +347,6 @@
 void*		smalloc(ulong);
 char*		srvname(Chan*);
 void		startwaitstats(int);
-void		stopnixproc(void);
 int		swapcount(ulong);
 void		swapinit(void);
 void		syscallfmt(int, va_list list);
--- /sys/src/nix/port/proc.c	Thu Apr 12 12:26:29 2012
+++ /sys/src/nix/port/proc.c	Sun Apr 15 13:08:33 2012
@@ -438,6 +438,7 @@
 	/*
 	 *  p->mach==0 only when process state is saved
 	 */
+
 	if(p == 0 || p->mach){
 		unlock(sch);
 		return nil;
@@ -1417,7 +1418,6 @@
 	lock(&pga);
 
 	stopac();
-	stopnixproc();
 	edfstop(up);
 	up->state = Moribund;
 	sched();
--- /sys/src/nix/port/sysproc.c	Thu Apr 12 12:26:29 2012
+++ /sys/src/nix/port/sysproc.c	Sun Apr 15 13:10:41 2012
@@ -702,6 +702,12 @@
 	print("sysr1() called. recompile your binary\n");
 }
 
+void
+sysnixsyscall(Ar0* , va_list )
+{
+	print("nixsyscall() called. recompile your binary\n");
+}
+
 int
 return0(void*)
 {
--- /sys/src/nix/port/syssem.c	Thu Apr 12 12:26:29 2012
+++ /sys/src/nix/port/syssem.c	Sun Apr 15 13:12:20 2012
@@ -5,8 +5,6 @@
 #include	"fns.h"
 #include	"../port/error.h"
 
-#include	"../port/tube.h"
-
 static int semtrytimes = 100;
 
 
@@ -307,150 +305,5 @@
 		if(downsem(ss[i], 1) != -1)
 			return i;
 	return semalt(ss, n);
-}
-
-/*
- * Tube entry points as seen by the kernel.
- * They use Sem*, and not int*
- */
-
-enum{Doblock, Dontblock, Already};	/* xsend() nb argument */
-
-/*
- * Assuming t points to valid memory,
- * create a KTube for the Tube pointed to by t.
- * This is suitable for using following functions to operate
- * on user tubes from the kernel.
- */
-KTube*
-u2ktube(Tube *t)
-{
-	KTube *kt;
-	Segment *sg;
-
-	kt = smalloc(sizeof *kt);
-	kt->t = t;
-	if((sg = seg(up, PTR2UINT(&t->nhole), 0)) == nil)
-		panic("u2ktube: was the tube verified?");
-	kt->hole = segmksem(sg, &t->nhole);
-	if(seg(up, PTR2UINT(&t->nmsg), 0) != sg)
-		panic("u2ktube: tricked user tube?");
-	kt->msg = segmksem(sg, &t->nmsg);
-	return kt;
-}
-
-static int
-xsend(KTube *kt, void *p, int nb)
-{
-	int n;
-	uchar *c;
-	Tube *t;
-
-	t = kt->t;
-	assert(t != nil && p != nil);
-	if(nb != Already && downsem(kt->hole, nb) < 0)
-		return -1;
-	n = ainc(&t->tl) - 1;
-	n %= t->tsz;
-	c = (uchar*)&t[1];
-	c += (1+t->msz) * n;
-	memmove(c+1, p, t->msz);
-	coherence();
-	*c = 1;
-	upsem(kt->msg);
-	return 0;
-}
-
-static int
-xrecv(KTube *kt, void *p, int nb)
-{
-	int n;
-	uchar *c;
-	Tube *t;
-
-	t = kt->t;
-	assert(t != nil && p != nil);
-	if(nb != Already && downsem(kt->msg, nb) < 0)
-		return -1;
-	n = ainc(&t->hd) - 1;
-	n %= t->tsz;
-	c = (uchar*)&t[1];
-	c += (1+t->msz) * n;
-	while(*c == 0)
-		yield();
-	memmove(p, c+1, t->msz);
-	coherence();
-	*c = 0;
-	upsem(kt->hole);
-	return 0;
-}
-
-void
-tsend(KTube *t, void *p)
-{
-	xsend(t, p, Doblock);
-}
-
-void
-trecv(KTube *t, void *p)
-{
-	xrecv(t, p, Doblock);
-}
-
-int
-nbtsend(KTube *t, void *p)
-{
-	return xsend(t, p, Dontblock);
-}
-
-int
-nbtrecv(KTube *t, void *p)
-{
-	return xrecv(t, p, Dontblock);
-}
-
-int
-talt(KTalt a[], int na)
-{
-	int i, n;
-	Sem **ss;
-
-	assert(a != nil && na > 0);
-	ss = smalloc(sizeof(Sem*) * na);
-	n = 0;
-	for(i = 0; i < na; i++)
-		switch(a[i].op){
-		case TSND:
-			ss[n++] = a[i].kt->hole;
-			break;
-		case TRCV:
-			ss[n++] = a[i].kt->msg;
-			break;
-		case TNBSND:
-			if(nbtsend(a[i].kt, a[i].m) != -1)
-				return i;
-			break;
-		case TNBRCV:
-			if(nbtrecv(a[i].kt, a[i].m) != -1)
-				return i;
-			break;
-		}
-	if(n == 0)
-		return -1;
-	i = altsems(ss, n);
-	free(ss);
-	if(i < 0)
-		return -1;
-	switch(a[i].op){
-	case TSND:
-		xsend(a[i].kt, a[i].m, Already);
-		break;
-	case TRCV:
-		xrecv(a[i].kt, a[i].m, Already);
-		break;
-	default:
-		panic("talt");
-	}
-	return i;
 }