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authorSergey Lapin <slapin@ossfans.org>2013-01-14 03:46:50 +0000
committerScott Wood <scottwood@freescale.com>2013-05-31 17:12:03 -0500
commitdfe64e2c89731a3f9950d7acd8681b68df2bae03 (patch)
tree880eae93d5f4bd3e9747960eea71502c67e49d8e /lib/string.c
parenta1b81ab26fbbdcbaa6e2a096397c75415181c298 (diff)
mtd: resync with Linux-3.7.1
This patch is essentially an update of u-boot MTD subsystem to the state of Linux-3.7.1 with exclusion of some bits: - the update is concentrated on NAND, no onenand or CFI/NOR/SPI flashes interfaces are updated EXCEPT for API changes. - new large NAND chips support is there, though some updates have got in Linux-3.8.-rc1, (which will follow on top of this patch). To produce this update I used tag v3.7.1 of linux-stable repository. The update was made using application of relevant patches, with changes relevant to U-Boot-only stuff sticked together to keep bisectability. Then all changes were grouped together to this patch. Signed-off-by: Sergey Lapin <slapin@ossfans.org> [scottwood@freescale.com: some eccstrength and build fixes] Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'lib/string.c')
-rw-r--r--lib/string.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c
index 09dfae03c24..3a82efab619 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -617,3 +617,62 @@ void *memchr(const void *s, int c, size_t n)
}
#endif
+#ifndef __HAVE_ARCH_MEMCHR_INV
+static void *check_bytes8(const u8 *start, u8 value, unsigned int bytes)
+{
+ while (bytes) {
+ if (*start != value)
+ return (void *)start;
+ start++;
+ bytes--;
+ }
+ return NULL;
+}
+/**
+ * memchr_inv - Find an unmatching character in an area of memory.
+ * @start: The memory area
+ * @c: Find a character other than c
+ * @bytes: The size of the area.
+ *
+ * returns the address of the first character other than @c, or %NULL
+ * if the whole buffer contains just @c.
+ */
+void *memchr_inv(const void *start, int c, size_t bytes)
+{
+ u8 value = c;
+ u64 value64;
+ unsigned int words, prefix;
+
+ if (bytes <= 16)
+ return check_bytes8(start, value, bytes);
+
+ value64 = value;
+ value64 |= value64 << 8;
+ value64 |= value64 << 16;
+ value64 |= value64 << 32;
+
+ prefix = (unsigned long)start % 8;
+ if (prefix) {
+ u8 *r;
+
+ prefix = 8 - prefix;
+ r = check_bytes8(start, value, prefix);
+ if (r)
+ return r;
+ start += prefix;
+ bytes -= prefix;
+ }
+
+ words = bytes / 8;
+
+ while (words) {
+ if (*(u64 *)start != value64)
+ return check_bytes8(start, value, 8);
+ start += 8;
+ words--;
+ }
+
+ return check_bytes8(start, value, bytes % 8);
+}
+#endif
+