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authorCatalin Marinas <catalin.marinas@arm.com>2013-03-21 16:16:43 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2013-03-21 17:39:29 +0000
commit4a8992271c843cb5bcd3321bf6a02eb251280b1d (patch)
tree100bdf14109f0d6b6ac559db6f25a337daa4280c /arch/arm64/lib/memset.S
parent792072066d30372772137be9ee2f4d72d77329f9 (diff)
arm64: klib: Optimised memory functions
This patch introduces AArch64-specific memory functions (memcpy, memmove, memchr, memset). These functions are not optimised for any CPU implementation but can be used as a starting point once hardware is available. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/lib/memset.S')
-rw-r--r--arch/arm64/lib/memset.S53
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/arm64/lib/memset.S b/arch/arm64/lib/memset.S
new file mode 100644
index 000000000000..87e4a68fbbbc
--- /dev/null
+++ b/arch/arm64/lib/memset.S
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2013 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * Fill in the buffer with character c (alignment handled by the hardware)
+ *
+ * Parameters:
+ * x0 - buf
+ * x1 - c
+ * x2 - n
+ * Returns:
+ * x0 - buf
+ */
+ENTRY(memset)
+ mov x4, x0
+ and w1, w1, #0xff
+ orr w1, w1, w1, lsl #8
+ orr w1, w1, w1, lsl #16
+ orr x1, x1, x1, lsl #32
+ subs x2, x2, #8
+ b.mi 2f
+1: str x1, [x4], #8
+ subs x2, x2, #8
+ b.pl 1b
+2: adds x2, x2, #4
+ b.mi 3f
+ sub x2, x2, #4
+ str w1, [x4], #4
+3: adds x2, x2, #2
+ b.mi 4f
+ sub x2, x2, #2
+ strh w1, [x4], #2
+4: adds x2, x2, #1
+ b.mi 5f
+ strb w1, [x4]
+5: ret
+ENDPROC(memset)