[PATCH 545] M68k: IP checksum updates

[Geert Uytterhoeven <geert@linux-m68k.org>]

M68k: IP checksum updates:
  - ip_fast_csum() needs a "memory" constraint with new gcc versions
  - Do not always use d0 in ip_fast_csum(), leave register allocation to gcc
  - Fixed constraints of csum_fold()
  - Fixed constraints of csum_tcpudp_nofold()
  - Moved comment for csum_tcpudp_magic() to the right place

Signed-off-by: Kars de Jong <jongk@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

--- linux-2.6.12-rc1/include/asm-m68k/checksum.h	2 Mar 2005 23:47:59 -0000	1.7
+++ linux-m68k-2.6.12-rc1/include/asm-m68k/checksum.h	9 Mar 2005 21:02:17 -0000	1.8
@@ -43,20 +43,21 @@
 ip_fast_csum(unsigned char *iph, unsigned int ihl)
 {
 	unsigned int sum = 0;
+	unsigned long tmp;
 
 	__asm__ ("subqw #1,%2\n"
 		 "1:\t"
-		 "movel %1@+,%/d0\n\t"
-		 "addxl %/d0,%0\n\t"
+		 "movel %1@+,%3\n\t"
+		 "addxl %3,%0\n\t"
 		 "dbra  %2,1b\n\t"
-		 "movel %0,%/d0\n\t"
-		 "swap  %/d0\n\t"
-		 "addxw %/d0,%0\n\t"
-		 "clrw  %/d0\n\t"
-		 "addxw %/d0,%0\n\t"
-		 : "=d" (sum), "=a" (iph), "=d" (ihl)
+		 "movel %0,%3\n\t"
+		 "swap  %3\n\t"
+		 "addxw %3,%0\n\t"
+		 "clrw  %3\n\t"
+		 "addxw %3,%0\n\t"
+		 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
 		 : "0" (sum), "1" (iph), "2" (ihl)
-		 : "d0");
+		 : "memory");
 	return ~sum;
 }
 
@@ -72,31 +73,31 @@
 		"clrw %1\n\t"
 		"addxw %1, %0"
 		: "=&d" (sum), "=&d" (tmp)
-		: "0" (sum), "1" (sum));
+		: "0" (sum), "1" (tmp));
 	return ~sum;
 }
 
 
-/*
- * computes the checksum of the TCP/UDP pseudo-header
- * returns a 16-bit checksum, already complemented
- */
-
 static inline unsigned int
 csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
 		  unsigned short proto, unsigned int sum)
 {
-	__asm__ ("addl  %1,%0\n\t"
+	__asm__ ("addl  %2,%0\n\t"
+		 "addxl %3,%0\n\t"
 		 "addxl %4,%0\n\t"
-		 "addxl %5,%0\n\t"
 		 "clrl %1\n\t"
 		 "addxl %1,%0"
-		 : "=&d" (sum), "=&d" (saddr)
-		 : "0" (daddr), "1" (saddr), "d" (len + proto),
-		   "d"(sum));
+		 : "=&d" (sum), "=d" (saddr)
+		 : "g" (daddr), "1" (saddr), "d" (len + proto),
+		   "0" (sum));
 	return sum;
 }
 
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
 static inline unsigned short int
 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
 		  unsigned short proto, unsigned int sum)

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds