sync rb kernel

Reference: /n/atom/patch/applied/rbsync
Date: Tue Apr 15 23:18:06 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/rb/l.s	Tue Apr 15 23:18:06 2014
+++ /sys/src/9/rb/l.s	Tue Apr 15 23:18:06 2014
@@ -842,7 +842,8 @@
 	MOVW	$1, R3
 	LL(2, 1)
 	NOP
-	ADDU	R1, R3, R3
+	ADDU	R1, R3
+	MOVW	R3, R1		/* return new value */
 	SC(2, 3)
 	NOP
 	BEQ	R3, loop
@@ -856,14 +857,15 @@
 	MOVW	$-1, R3
 	LL(2, 1)
 	NOP
-	ADDU	R1, R3, R3
-	MOVW	R3, R1
+	ADDU	R1, R3
+	MOVW	R3, R1		/* return new value */
 	SC(2, 3)
 	NOP
 	BEQ	R3, loop1
 	NOP
 	RETURN
 
+/* used by the semaphore implementation */
 TEXT cmpswap(SB), $0
 	MOVW	R1, R2		/* address of key */
 	MOVW	old+4(FP), R3	/* old value */
--- /sys/src/9/rb/main.c	Tue Apr 15 23:18:06 2014
+++ /sys/src/9/rb/main.c	Tue Apr 15 23:18:06 2014
@@ -105,20 +105,6 @@
 			m->machno, gethwreg3());
 }
 
-#ifdef no
-static void
-fmtinit(void)
-{
-	quotefmtinstall();
-	/* ipreset installs these when chandevreset runs */
-	fmtinstall('i', eipfmt);
-	fmtinstall('I', eipfmt);
-	fmtinstall('E', eipfmt);
-	fmtinstall('V', eipfmt);
-	fmtinstall('M', eipfmt);
-}
-#endif
-
 static int
 ckpagemask(ulong mask, ulong size)
 {
--- /sys/src/9/rb/mkfile	Tue Apr 15 23:18:06 2014
+++ /sys/src/9/rb/mkfile	Tue Apr 15 23:18:06 2014
@@ -20,7 +20,6 @@
 
 PORT=\
 	alarm.$O\
-#	alloc.$O\
 	allocb.$O\
 	auth.$O\
 	cache.$O\
@@ -41,12 +40,10 @@
 	rdb.$O\
 	rebootcmd.$O\
 	segment.$O\
-#	swap.$O\
 	sysfile.$O\
 	sysproc.$O\
 	taslock.$O\
 	tod.$O\
-#	xalloc.$O\
 
 OBJ=\
 	l.$O\