From: Stefan Reinauer <reinauer@chromium.org>
Date: Tue, 25 Oct 2011 23:43:34 +0000 (+0000)
Subject: Add faster, architecture dependent memcpy()
X-Git-Url: http://wien.tomnetworks.com/gitweb/?p=coreboot.git;a=commitdiff_plain;h=0054afa11daa8db78dbe6aa55150238525187596

Add faster, architecture dependent memcpy()

Change-Id: I38d15f3f1ec65f0cb7974d2dd4ae6356433bddd8
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: http://review.coreboot.org/736
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)
---

diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig
index 314646fdb..5ee7c4ac7 100644
--- a/src/arch/x86/Kconfig
+++ b/src/arch/x86/Kconfig
@@ -76,6 +76,10 @@ config CMOS_DEFAULT_FILE
 config BOOTBLOCK_SOUTHBRIDGE_INIT
 	string
 
+config HAVE_ARCH_MEMCPY
+	bool
+	default y
+
 config BIG_ENDIAN
 	bool
 	default n
diff --git a/src/arch/x86/lib/Makefile.inc b/src/arch/x86/lib/Makefile.inc
index 3388a9dea..f99e429ee 100644
--- a/src/arch/x86/lib/Makefile.inc
+++ b/src/arch/x86/lib/Makefile.inc
@@ -8,8 +8,12 @@ ramstage-$(CONFIG_MMCONF_SUPPORT) += pci_ops_mmconf.c
 ramstage-y += pci_ops_auto.c
 ramstage-y += exception.c
 ramstage-$(CONFIG_IOAPIC) += ioapic.c
+ramstage-y += memcpy.c
 
 romstage-y += romstage_console.c
 romstage-y += cbfs_and_run.c
+romstage-y += memcpy.c
+
+smm-y += memcpy.c
 
 $(obj)/arch/x86/lib/console.ramstage.o :: $(obj)/build.h
diff --git a/src/arch/x86/lib/memcpy.c b/src/arch/x86/lib/memcpy.c
new file mode 100644
index 000000000..de210928a
--- /dev/null
+++ b/src/arch/x86/lib/memcpy.c
@@ -0,0 +1,13 @@
+#include <string.h>
+
+void *memcpy(void *__restrict __dest,
+	     __const void *__restrict __src, size_t __n)
+{
+	asm("cld\n"
+	    "rep\n"
+	    "movsb"
+	    :	/* no input (?) */
+	    :"S"(__src), "D"(__dest), "c"(__n)
+	);
+	return __dest;
+}
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index 45cb7887a..61b6451d0 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -2,7 +2,9 @@
 
 romstage-y += memset.c
 romstage-y += memchr.c
+ifneq ($(CONFIG_HAVE_ARCH_MEMCPY),y)
 romstage-y += memcpy.c
+endif
 romstage-y += memcmp.c
 romstage-y += cbfs.c
 romstage-y += lzma.c
@@ -19,7 +21,9 @@ romstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
 
 ramstage-y += memset.c
 ramstage-y += memchr.c
+ifneq ($(CONFIG_HAVE_ARCH_MEMCPY),y)
 ramstage-y += memcpy.c
+endif
 ramstage-y += memcmp.c
 ramstage-y += memmove.c
 ramstage-y += malloc.c
@@ -43,7 +47,10 @@ ramstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
 
 driver-$(CONFIG_CONSOLE_NE2K) += ne2k.c
 
-smm-y += memcpy.c cbfs.c memset.c memcmp.c
+ifneq ($(CONFIG_HAVE_ARCH_MEMCPY),y)
+smm-y += memcpy.c
+endif
+smm-y += cbfs.c memset.c memcmp.c
 smm-$(CONFIG_CONSOLE_SERIAL8250) += uart8250.c
 smm-$(CONFIG_CONSOLE_SERIAL8250MEM) += uart8250mem.c
 smm-$(CONFIG_USBDEBUG) += usbdebug.c