diff options
author | Stefan Reinauer <reinauer@chromium.org> | 2011-10-26 22:11:52 +0000 |
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committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2012-03-30 00:57:24 +0200 |
commit | 1afe51af83ad0beb3f0ace1085524b327ecff7c6 (patch) | |
tree | ddbc7a6a026d598691a1c9c6292fbd14dad08c1c /src/arch/x86 | |
parent | 0054afa11daa8db78dbe6aa55150238525187596 (diff) | |
download | coreboot-1afe51af83ad0beb3f0ace1085524b327ecff7c6.tar.xz |
Add native memset() function on x86
Change-Id: Ia118ebe0a4b59bdcefd78895141a365170f6aed2
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/737
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/arch/x86')
-rw-r--r-- | src/arch/x86/Kconfig | 4 | ||||
-rw-r--r-- | src/arch/x86/lib/Makefile.inc | 2 | ||||
-rw-r--r-- | src/arch/x86/lib/memset.c | 85 |
3 files changed, 91 insertions, 0 deletions
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig index 5ee7c4ac77..4ca49cbaf4 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_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 f99e429eef..3f4dc95560 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 0000000000..7c8129a3fc --- /dev/null +++ b/src/arch/x86/lib/memset.c @@ -0,0 +1,85 @@ +/* + * Copyright (C) 1991,1992,1993,1997,1998,2003, 2005 Free Software Foundation, Inc. + * This file is part of the GNU C Library. + * + * 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; +} |