Revert "arm64: remove assembly code string functions"

This reverts commit 00263d0d8e
to reintroduce optimized string handling functions.

BUG=chrome-os-partner:41185
BRANCH=None
TEST=Compiles successfully and boots to kernel prompt on Smaug

Change-Id: I47f8d8afa5c9ff3fca67d4d0f393336fef03402b
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: eeb38afea828a2727d815e4fb5762cfdd09a2b3a
Original-Change-Id: Id053cbcea8b5e7ae29bdd6bb8b6f5e5011c42b00
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/275865
Original-Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/10564
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>

src/arch/arm64/Makefile.inc

@@ -66,9 +66,9 @@ bootblock-y += eabi_compat.c
 bootblock-y += transition.c transition_asm.S
 bootblock-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
 
-bootblock-y += ../../lib/memset.c
-bootblock-y += ../../lib/memcpy.c
-bootblock-y += ../../lib/memmove.c
+bootblock-y += memset.S
+bootblock-y += memcpy.S
+bootblock-y += memmove.S
 
 # Build the bootblock
 
@@ -112,15 +112,15 @@ romstage-y += cpu-stubs.c
 romstage-y += stages.c
 romstage-y += div0.c
 romstage-y += eabi_compat.c
-romstage-y += ../../lib/memset.c
-romstage-y += ../../lib/memcpy.c
-romstage-y += ../../lib/memmove.c
+romstage-y += memset.S
+romstage-y += memcpy.S
+romstage-y += memmove.S
 romstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
 romstage-y += transition.c transition_asm.S
 
-rmodules_arm64-y += ../../lib/memset.c
-rmodules_arm64-y += ../../lib/memcpy.c
-rmodules_arm64-y += ../../lib/memmove.c
+rmodules_arm64-y += memset.S
+rmodules_arm64-y += memcpy.S
+rmodules_arm64-y += memmove.S
 rmodules_arm64-y += eabi_compat.c
 
 # Build the romstage
@@ -147,27 +147,27 @@ ramstage-y += cpu_ramstage.c
 ramstage-y += eabi_compat.c
 ramstage-y += boot.c
 ramstage-y += tables.c
-ramstage-y += ../../lib/memset.c
-ramstage-y += ../../lib/memcpy.c
-ramstage-y += ../../lib/memmove.c
+ramstage-y += memset.S
+ramstage-y += memcpy.S
+ramstage-y += memmove.S
 ramstage-y += stage_entry.S
 ramstage-y += cpu-stubs.c
 ramstage-$(CONFIG_ARM64_USE_SPINTABLE) += spintable.c spintable_asm.S
 ramstage-$(CONFIG_ARM64_USE_ARM_TRUSTED_FIRMWARE) += arm_tf.c
 ramstage-y += transition.c transition_asm.S
 
-rmodules_arm64-y += ../../lib/memset.c
-rmodules_arm64-y += ../../lib/memcpy.c
-rmodules_arm64-y += ../../lib/memmove.c
+rmodules_arm64-y += memset.S
+rmodules_arm64-y += memcpy.S
+rmodules_arm64-y += memmove.S
 rmodules_arm64-y += eabi_compat.c
 
 secmon-y += stage_entry.S
 secmon-y += cpu-stubs.c
 secmon-y += startup.c
 secmon-y += ../../lib/malloc.c
-secmon-y += ../../lib/memset.c
-secmon-y += ../../lib/memcmp.c
-secmon-y += ../../lib/memcpy.c
+secmon-y += memset.S
+secmon-y += memmove.S
+secmon-y += memcpy.S
 
 ramstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
 

src/arch/arm64/memcpy.S

@@ -0,0 +1,52 @@
+/*
+ * 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 <arch/asm.h>
+
+/*
+ * Copy a buffer from src to dest (alignment handled by the hardware)
+ *
+ * Parameters:
+ *	x0 - dest
+ *	x1 - src
+ *	x2 - n
+ * Returns:
+ *	x0 - dest
+ */
+ENTRY(memcpy)
+	mov	x4, x0
+	subs	x2, x2, #8
+	b.mi	2f
+1:	ldr	x3, [x1], #8
+	subs	x2, x2, #8
+	str	x3, [x4], #8
+	b.pl	1b
+2:	adds	x2, x2, #4
+	b.mi	3f
+	ldr	w3, [x1], #4
+	sub	x2, x2, #4
+	str	w3, [x4], #4
+3:	adds	x2, x2, #2
+	b.mi	4f
+	ldrh	w3, [x1], #2
+	sub	x2, x2, #2
+	strh	w3, [x4], #2
+4:	adds	x2, x2, #1
+	b.mi	5f
+	ldrb	w3, [x1]
+	strb	w3, [x4]
+5:	ret
+ENDPROC(memcpy)

src/arch/arm64/memmove.S

@@ -0,0 +1,55 @@
+/*
+ * 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 <arch/asm.h>
+/*
+ * Move a buffer from src to test (alignment handled by the hardware).
+ * If dest <= src, call memcpy, otherwise copy in reverse order.
+ *
+ * Parameters:
+ *	x0 - dest
+ *	x1 - src
+ *	x2 - n
+ * Returns:
+ *	x0 - dest
+ */
+ENTRY(memmove)
+	cmp	x0, x1
+	b.ls	memcpy
+	add	x4, x0, x2
+	add	x1, x1, x2
+	subs	x2, x2, #8
+	b.mi	2f
+1:	ldr	x3, [x1, #-8]!
+	subs	x2, x2, #8
+	str	x3, [x4, #-8]!
+	b.pl	1b
+2:	adds	x2, x2, #4
+	b.mi	3f
+	ldr	w3, [x1, #-4]!
+	sub	x2, x2, #4
+	str	w3, [x4, #-4]!
+3:	adds	x2, x2, #2
+	b.mi	4f
+	ldrh	w3, [x1, #-2]!
+	sub	x2, x2, #2
+	strh	w3, [x4, #-2]!
+4:	adds	x2, x2, #1
+	b.mi	5f
+	ldrb	w3, [x1, #-1]
+	strb	w3, [x4, #-1]
+5:	ret
+ENDPROC(memmove)

src/arch/arm64/memset.S

@@ -0,0 +1,52 @@
+/*
+ * 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 <arch/asm.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)