MIPS: ZBOOT: gather string functions into string.c

In the worst case this adds less then 128 bytes of code
but on the other hand this makes code organization more clear.

Signed-off-by: Antony Pavlov <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Cc: [e-mail]
Cc: Ralf Baechle <[e-mail]>
Cc: John Crispin <[e-mail]>
Cc: Florian Fainelli <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
Signed-off-by: John Crispin <[e-mail]>
Patchwork: http://patchwork.linux-mips.org/patch/6344/

arch/mips/boot/compressed/Makefile

···
 	-DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) \
 	-DKERNEL_ENTRY=$(VMLINUX_ENTRY_ADDRESS)
 
-targets := head.o decompress.o dbg.o uart-16550.o uart-alchemy.o
+targets := head.o decompress.o string.o dbg.o uart-16550.o uart-alchemy.o
 
 # decompressor objects (linked with vmlinuz)
-vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/dbg.o
+vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/string.o $(obj)/dbg.o
 
 ifdef CONFIG_DEBUG_ZBOOT
 vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o

arch/mips/boot/compressed/decompress.c

···
 /* activate the code for pre-boot environment */
 #define STATIC static
 
-#if defined(CONFIG_KERNEL_GZIP) || defined(CONFIG_KERNEL_XZ) || \
-	defined(CONFIG_KERNEL_LZ4)
-void *memcpy(void *dest, const void *src, size_t n)
-{
-	int i;
-	const char *s = src;
-	char *d = dest;
-
-	for (i = 0; i < n; i++)
-		d[i] = s[i];
-	return dest;
-}
-#endif
 #ifdef CONFIG_KERNEL_GZIP
 #include "../../../../lib/decompress_inflate.c"
 #endif
 
 #ifdef CONFIG_KERNEL_BZIP2
-void *memset(void *s, int c, size_t n)
-{
-	int i;
-	char *ss = s;
-
-	for (i = 0; i < n; i++)
-		ss[i] = c;
-	return s;
-}
 #include "../../../../lib/decompress_bunzip2.c"
 #endif
 

arch/mips/boot/compressed/string.c

···
+/*
+ * arch/mips/boot/compressed/string.c
+ *
+ * Very small subset of simple string routines
+ */
+
+#include <linux/types.h>
+
+void *memcpy(void *dest, const void *src, size_t n)
+{
+	int i;
+	const char *s = src;
+	char *d = dest;
+
+	for (i = 0; i < n; i++)
+		d[i] = s[i];
+	return dest;
+}
+
+void *memset(void *s, int c, size_t n)
+{
+	int i;
+	char *ss = s;
+
+	for (i = 0; i < n; i++)
+		ss[i] = c;
+	return s;
+}