[ARM PATCH] 1442/1: add preload support to page_copy for ARM architectures that support

 it

Patch from Nicolas Pitre

This requires the definition of PLD added to assembler.h in
patch #1363/1.

arch/arm/lib/copy_page.S

@@ -13,6 +13,12 @@
 #include <asm/assembler.h>
 #include <asm/constants.h>
 
+#ifndef PLD
+#define COPY_COUNT PAGE_SZ/64
+#else
+#define COPY_COUNT PAGE_SZ/64-1
+#endif
+
 		.text
 		.align	5
 /*
@@ -23,9 +29,13 @@
  */
 ENTRY(copy_page)
 		stmfd	sp!, {r4, lr}			@	2
-		mov	r2, #PAGE_SZ/64			@	1
+	PLD(	pld	[r1, #0]		)
+	PLD(	pld	[r1, #32]		)
+		mov	r2, #COPY_COUNT			@	1
 		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
-1:		stmia	r0!, {r3, r4, ip, lr}		@	4
+1:	PLD(	pld	[r1, #64]		)
+	PLD(	pld	[r1, #96]		)
+2:		stmia	r0!, {r3, r4, ip, lr}		@	4
 		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
 		stmia	r0!, {r3, r4, ip, lr}		@	4
 		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
@@ -33,6 +43,8 @@ ENTRY(copy_page)
 		ldmia	r1!, {r3, r4, ip, lr}		@	4
 		subs	r2, r2, #1			@	1
 		stmia	r0!, {r3, r4, ip, lr}		@	4
-		ldmneia	r1!, {r3, r4, ip, lr}		@	4
-		bne	1b				@	1
+		ldmgtia	r1!, {r3, r4, ip, lr}		@	4
+		bgt	1b				@	1
+	PLD(	ldmeqia r1!, {r3, r4, ip, lr}	)
+	PLD(	beq	2b			)
 		LOADREGS(fd, sp!, {r4, pc})		@	3