[POWERPC] Add memchr() to the bootwrapper

This adds a memchr() implementation to the bootwrapper, which will
be needed when libfdt is merged in.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 14 insertions, 0 deletions

diff --git a/arch/powerpc/boot/string.S b/arch/powerpc/boot/string.S
index 2627558bcb71..643e4cb2f11d 100644
--- a/arch/powerpc/boot/string.S
+++ b/arch/powerpc/boot/string.S
@@ -219,6 +219,19 @@ backwards_memcpy:
         mtctr   r7
         b       1b
 
+        .globl  memchr
+memchr:
+        cmpwi   0,r5,0
+        blelr
+        mtctr   r5
+        addi    r3,r3,-1
+1:      lbzu    r0,1(r3)
+        cmpw    r0,r4
+        beqlr
+        bdnz    1b
+        li      r3,0
+        blr
+
         .globl  memcmp
 memcmp:
         cmpwi   0,r5,0
diff --git a/arch/powerpc/boot/string.h b/arch/powerpc/boot/string.h
index 4650030d1040..50091cc0eed9 100644
--- a/arch/powerpc/boot/string.h
+++ b/arch/powerpc/boot/string.h
@@ -14,6 +14,7 @@ extern size_t strnlen(const char *s, size_t count);
 extern void *memset(void *s, int c, size_t n);
 extern void *memmove(void *dest, const void *src, unsigned long n);
 extern void *memcpy(void *dest, const void *src, unsigned long n);
+extern void *memchr(const void *s, int c, size_t n);
 extern int memcmp(const void *s1, const void *s2, size_t n);
 
 #endif  /* _PPC_BOOT_STRING_H_ */