Merged of mcp750 and mvme2307 BSP by Eric Valette <valette@crf.canon.fr>.

As part of this effort, the mpc750 libcpu code is now shared with the
ppc6xx.

c/src/lib/libcpu/powerpc/mpc6xx/exceptions/asm_utils.S

@@ -0,0 +1,65 @@
+/*
+ *  asm_utils.s
+ *
+ *  $Id$
+ *
+ *  Copyright (C) 1999 Eric Valette (valette@crf.canon.fr)
+ *
+ *  This file contains the low-level support for moving exception
+ *  exception code to appropriate location.
+ *
+ */
+
+#include <libcpu/cpu.h>
+#include <libcpu/io.h>
+#include <rtems/score/targopts.h>
+#include "asm.h"
+
+	.globl  codemove
+codemove:
+	.type	codemove,@function
+/* r3 dest, r4 src, r5 length in bytes, r6 cachelinesize */
+	cmplw	cr1,r3,r4
+	addi	r0,r5,3
+	srwi.	r0,r0,2
+	beq	cr1,4f	/* In place copy is not necessary */
+	beq	7f	/* Protect against 0 count */
+	mtctr	r0
+	bge	cr1,2f
+	
+	la	r8,-4(r4)
+	la	r7,-4(r3)
+1:	lwzu	r0,4(r8)
+	stwu	r0,4(r7)	
+	bdnz	1b
+	b	4f
+
+2:	slwi	r0,r0,2
+	add	r8,r4,r0
+	add	r7,r3,r0
+3:	lwzu	r0,-4(r8)
+	stwu	r0,-4(r7)
+	bdnz	3b
+	
+/* Now flush the cache:	note that we must start from a cache aligned
+ * address. Otherwise we might miss one cache line. 
+ */
+4:	cmpwi	r6,0
+	add	r5,r3,r5
+	beq	7f	/* Always flush prefetch queue in any case */ 
+	subi	r0,r6,1
+	andc	r3,r3,r0
+	mr	r4,r3
+5:	cmplw	r4,r5	
+	dcbst	0,r4
+	add	r4,r4,r6
+	blt	5b
+	sync		/* Wait for all dcbst to complete on bus */
+	mr	r4,r3
+6:	cmplw	r4,r5	
+	icbi	0,r4
+	add	r4,r4,r6
+	blt	6b
+7:	sync		/* Wait for all icbi to complete on bus */
+	isync
+	blr