Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/737
-gerrit
commit 02adb9a045c12eda0797fbe1b7e832cd742b3de7 Author: Stefan Reinauer reinauer@chromium.org Date: Wed Oct 26 22:11:52 2011 +0000
add native memset() function on x86.
Change-Id: Ia118ebe0a4b59bdcefd78895141a365170f6aed2 Signed-off-by: Stefan Reinauer reinauer@google.com --- src/arch/x86/Kconfig | 4 ++ src/arch/x86/lib/Makefile.inc | 2 + src/arch/x86/lib/memset.c | 86 +++++++++++++++++++++++++++++++++++++++++ src/lib/Makefile.inc | 4 ++ 4 files changed, 96 insertions(+), 0 deletions(-)
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig index 74933af..078ae95 100644 --- a/src/arch/x86/Kconfig +++ b/src/arch/x86/Kconfig @@ -80,6 +80,10 @@ config CMOS_DEFAULT_FILE config BOOTBLOCK_SOUTHBRIDGE_INIT string
+config HAVE_ARCH_MEMSET + bool + default y + config HAVE_ARCH_MEMCPY bool default y diff --git a/src/arch/x86/lib/Makefile.inc b/src/arch/x86/lib/Makefile.inc index f99e429..3f4dc95 100644 --- a/src/arch/x86/lib/Makefile.inc +++ b/src/arch/x86/lib/Makefile.inc @@ -8,10 +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 += memset.c ramstage-y += memcpy.c
romstage-y += romstage_console.c romstage-y += cbfs_and_run.c +romstage-y += memset.c romstage-y += memcpy.c
smm-y += memcpy.c diff --git a/src/arch/x86/lib/memset.c b/src/arch/x86/lib/memset.c new file mode 100644 index 0000000..e850726 --- /dev/null +++ b/src/arch/x86/lib/memset.c @@ -0,0 +1,86 @@ +/* + * Copyright (C) 1991,1992,1993,1997,1998,2003, 2005 Free Software Foundation, Inc. + * This file is part of the GNU C Library. + * Copyright (c) 2011 The Chromium OS Authors. All rights reserved. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* From glibc-2.14, sysdeps/i386/memset.c */ + +#include <string.h> +#include <stdint.h> + +typedef uint32_t op_t; + +void *memset(void *dstpp, int c, size_t len) +{ + int d0; + unsigned long int dstp = (unsigned long int) dstpp; + + /* This explicit register allocation improves code very much indeed. */ + register op_t x asm("ax"); + + x = (unsigned char) c; + + /* Clear the direction flag, so filling will move forward. */ + asm volatile("cld"); + + /* This threshold value is optimal. */ + if (len >= 12) { + /* Fill X with four copies of the char we want to fill with. */ + x |= (x << 8); + x |= (x << 16); + + /* Adjust LEN for the bytes handled in the first loop. */ + len -= (-dstp) % sizeof(op_t); + + /* + * There are at least some bytes to set. No need to test for + * LEN == 0 in this alignment loop. + */ + + /* Fill bytes until DSTP is aligned on a longword boundary. */ + asm volatile( + "rep\n" + "stosb" /* %0, %2, %3 */ : + "=D" (dstp), "=c" (d0) : + "0" (dstp), "1" ((-dstp) % sizeof(op_t)), "a" (x) : + "memory"); + + /* Fill longwords. */ + asm volatile( + "rep\n" + "stosl" /* %0, %2, %3 */ : + "=D" (dstp), "=c" (d0) : + "0" (dstp), "1" (len / sizeof(op_t)), "a" (x) : + "memory"); + len %= sizeof(op_t); + } + + /* Write the last few bytes. */ + asm volatile( + "rep\n" + "stosb" /* %0, %2, %3 */ : + "=D" (dstp), "=c" (d0) : + "0" (dstp), "1" (len), "a" (x) : + "memory"); + + return dstpp; +} diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc index 61b6451..8ce72b2 100644 --- a/src/lib/Makefile.inc +++ b/src/lib/Makefile.inc @@ -1,6 +1,8 @@
+ifneq ($(CONFIG_HAVE_ARCH_MEMSET),y) romstage-y += memset.c +endif romstage-y += memchr.c ifneq ($(CONFIG_HAVE_ARCH_MEMCPY),y) romstage-y += memcpy.c @@ -19,7 +21,9 @@ romstage-$(CONFIG_CONSOLE_NE2K) += compute_ip_checksum.c romstage-$(CONFIG_USBDEBUG) += usbdebug.c romstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
+ifneq ($(CONFIG_HAVE_ARCH_MEMSET),y) ramstage-y += memset.c +endif ramstage-y += memchr.c ifneq ($(CONFIG_HAVE_ARCH_MEMCPY),y) ramstage-y += memcpy.c