powerpc/booke64: Fix args to copy_and_flush

Convert r4/r5, not r6, to a virtual address when calling
copy_and_flush.  Otherwise, r3 is already virtual, and copy_to_flush
tries to access r3+r6, PAGE_OFFSET gets added twice.

This isn't normally seen because on book3e we normally enter with
the kernel at zero and thus skip copy_to_flush -- but it will be
needed for kexec support.
Signed-off-by: NTiejun Chen <tiejun.chen@windriver.com>
[scottwood: split patch and rewrote changelog]
Signed-off-by: NScott Wood <scottwood@freescale.com>

arch/powerpc/kernel/head_64.S

@@ -474,15 +474,15 @@ __after_prom_start:
  */
 	li	r3,0			/* target addr */
 #ifdef CONFIG_PPC_BOOK3E
-	tovirt(r3,r3)			/* on booke, we already run at PAGE_OFFSET */
+	tovirt(r3,r3)		/* on booke, we already run at PAGE_OFFSET */
 #endif
 	mr.	r4,r26			/* In some cases the loader may  */
+#if defined(CONFIG_PPC_BOOK3E)
+	tovirt(r4,r4)
+#endif
 	beq	9f			/* have already put us at zero */
 	li	r6,0x100		/* Start offset, the first 0x100 */
 					/* bytes were copied earlier.	 */
-#ifdef CONFIG_PPC_BOOK3E
-	tovirt(r6,r6)			/* on booke, we already run at PAGE_OFFSET */
-#endif
 
 #ifdef CONFIG_RELOCATABLE
 /*
@@ -514,6 +514,9 @@ __after_prom_start:
 p_end:	.llong	_end - _stext
 
 4:	/* Now copy the rest of the kernel up to _end */
+#if defined(CONFIG_PPC_BOOK3E)
+	tovirt(r26,r26)
+#endif
 	addis	r5,r26,(p_end - _stext)@ha
 	ld	r5,(p_end - _stext)@l(r5)	/* get _end */
 5:	bl	copy_and_flush		/* copy the rest */