Ronald G. Minnich (rminnich@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3577
-gerrit
commit 508606d5e805e2669d9b6ad7ed9695bfd0970fb0 Author: Gabe Black gabeblack@chromium.org Date: Mon Jul 1 04:28:23 2013 -0700
CBFS: Use memmove instead of memcpy when loading a file from CBFS.
It might be the case that a file is being loaded from a portion of CBFS which has already been loaded into a limitted bit of memory somewhere, and we want to load that file in place, effectively, so that it's original location in CBFS overlaps with its new location. That's only guaranteed to work if you use memmove instead of memcpy.
One significant downside of this change is that there aren't yet architecture optimized (aka not horribly performing) implementations of memmove available for either x86 or ARM. It's not clear whether the performance difference would be significant enough to notice in practice since the things in CBFS are probably not that big. It might still be a good idea to hold off on this change until optimized versions are available to avoid any potential performance hit.
This also means that memmove needs to be built into the bootblock.
Change-Id: Id550138c875907749fff05f330fcd2fb5f9ed924 Signed-off-by: Gabe Black gabeblack@chromium.org --- src/arch/armv7/Kconfig | 8 ++++++++ src/lib/Makefile.inc | 3 ++- src/lib/cbfs_core.c | 2 +- src/lib/memmove.c | 23 +++++++++++++++++++++++ 4 files changed, 34 insertions(+), 2 deletions(-)
diff --git a/src/arch/armv7/Kconfig b/src/arch/armv7/Kconfig index 488ca97..eea6d40 100644 --- a/src/arch/armv7/Kconfig +++ b/src/arch/armv7/Kconfig @@ -49,4 +49,12 @@ config ARM_DCACHE_POLICY_WRITETHROUGH bool default n
+config HAVE_ARCH_MEMSET + bool + default n + +config HAVE_ARCH_MEMCPY + bool + default n + endmenu diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc index d44f4a7..88c34c1 100644 --- a/src/lib/Makefile.inc +++ b/src/lib/Makefile.inc @@ -26,6 +26,7 @@ ifneq ($(CONFIG_HAVE_ARCH_MEMCPY),y) bootblock-y += memcpy.c endif bootblock-y += memcmp.c +bootblock-y += memmove.c
ifneq ($(CONFIG_HAVE_ARCH_MEMSET),y) romstage-y += memset.c @@ -115,7 +116,7 @@ endif ifneq ($(CONFIG_HAVE_ARCH_MEMCPY),y) smm-y += memcpy.c endif -smm-y += cbfs.c memcmp.c +smm-y += cbfs.c memcmp.c memmove.c smm-$(CONFIG_CONSOLE_SERIAL8250) += uart8250.c smm-$(CONFIG_CONSOLE_SERIAL8250MEM) += uart8250mem.c smm-$(CONFIG_USBDEBUG) += usbdebug.c diff --git a/src/lib/cbfs_core.c b/src/lib/cbfs_core.c index 852b37f..39c1ff6 100644 --- a/src/lib/cbfs_core.c +++ b/src/lib/cbfs_core.c @@ -195,7 +195,7 @@ int cbfs_decompress(int algo, void *src, void *dst, int len) { switch (algo) { case CBFS_COMPRESS_NONE: - memcpy(dst, src, len); + memmove(dst, src, len); return 0; #ifdef CBFS_CORE_WITH_LZMA case CBFS_COMPRESS_LZMA: diff --git a/src/lib/memmove.c b/src/lib/memmove.c index 241917c..b4f5b92 100644 --- a/src/lib/memmove.c +++ b/src/lib/memmove.c @@ -1,4 +1,27 @@ +/* + * Copyright 2013 Google Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * on the rights to use, copy, modify, merge, publish, distribute, sub + * license, and/or sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER + * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + #include <string.h> + void *memmove(void *vdest, const void *vsrc, size_t count) { const char *src = vsrc;