arm: Update mem* functions to newer versions

The memcpy/memset/memmove assembly implementations have been taken from
U-Boot, which originally got them from Linux. I turns out that they are
actually not that bad, but they could use an update. This patch pulls in
the current Linux upstream versions of those files, removing some old
U-Boot cruft such as checking whether the two pointers in a memcpy() are
equal (really now?) or side-stepping the R8 register because it was used
for special purposes. It also returns to the good old Linux
ENTRY/ENDPROC macros since we have them now anyway, and straightens out
the W() macro in preparation for unified thumb support.

Change-Id: I138af269b423bef0a237759ac29f1ee58ca206a0
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/182179
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
(cherry picked from commit 777127997bde5785b21d422d0b6eb04c4328b478)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6918
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/src/arch/arm/asmlib.h b/src/arch/arm/asmlib.h
new file mode 100644
index 0000000000..cef0e7ea1a
--- /dev/null
+++ b/src/arch/arm/asmlib.h
@@ -0,0 +1,72 @@
+/*
+ *  arch/arm/asmlib.h
+ *
+ *  Adapted from Linux arch/arm/include/assembler.h
+ *
+ *  Copyright (C) 1996-2000 Russell King
+ *
+ * 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 file contains arm architecture specific defines
+ *  for the different processors.
+ *
+ *  Do not include any C declarations in this file - it is included by
+ *  assembler source.
+ */
+
+/*
+ * WARNING: This file is *only* meant for memcpy.S and friends which were copied
+ * from Linux and require some weird macros. It does unspeakable things like
+ * redefining "push", so do *not* try to turn it into a general assembly macro
+ * file, and keep it out of global include directories.
+ */
+
+#ifndef __ARM_ASMLIB_H__
+#define __ARM_ASMLIB_H__
+
+/*
+ * Endian independent macros for shifting bytes within registers.
+ */
+#ifndef __ARMEB__
+#define pull		lsr
+#define push		lsl
+#define get_byte_0	lsl #0
+#define get_byte_1	lsr #8
+#define get_byte_2	lsr #16
+#define get_byte_3	lsr #24
+#define put_byte_0	lsl #0
+#define put_byte_1	lsl #8
+#define put_byte_2	lsl #16
+#define put_byte_3	lsl #24
+#else
+#define pull		lsl
+#define push		lsr
+#define get_byte_0	lsr #24
+#define get_byte_1	lsr #16
+#define get_byte_2	lsr #8
+#define get_byte_3      lsl #0
+#define put_byte_0	lsl #24
+#define put_byte_1	lsl #16
+#define put_byte_2	lsl #8
+#define put_byte_3      lsl #0
+#endif
+
+/*
+ * Data preload for architectures that support it
+ */
+#if __COREBOOT_ARM_ARCH__ >= 5
+#define PLD(code...)	code
+#else
+#define PLD(code...)
+#endif
+
+/*
+ * This can be used to enable code to cacheline align the destination
+ * pointer when bulk writing to memory. Linux doesn't enable this except
+ * for the "Feroceon" processor, so we better just leave it out.
+ */
+#define CALGN(code...)
+
+#endif	/* __ARM_ASMLIB_H */