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authorWolfgang Denk <wd@denx.de>2011-12-02 00:17:49 +0100
committerWolfgang Denk <wd@denx.de>2011-12-02 00:17:49 +0100
commit7708d8b352e9e595f6f08afd3206af6495c7dc09 (patch)
treefb9811040b2b1f55c44fc7274473f2ef0847c19b /arch/x86/lib/string.c
parentd887ad54ca74063338bc3108beed0aa4f15d1f6b (diff)
parentf008b17f8c2995996b5d100b71f8851d6f74a136 (diff)
Merge branch 'master' of ssh://gemini/home/wd/git/u-boot/master
* 'master' of ssh://gemini/home/wd/git/u-boot/master: board/emk/top860/top860.c: Fix GCC 4.6 build warning board/sbc405/strataflash.c: Fix GCC 4.6 build warning arch/powerpc/cpu/mpc86xx/cpu.c: Fix GCC 4.6 build warning board/freescale/mpc8610hpcd/mpc8610hpcd.c: Fix GCC 4.6 build warning board/mpl/common/flash.c: Fix GCC 4.6 build warning post/board/lwmon5/gdc.c: Fix GCC 4.6 build warning drivers/usb/host/sl811-hcd.c: Fix GCC 4.6 build warning board/sandburst/common/flash.c: Fix GCC 4.6 build warning DB64460: Fix GCC 4.6 build warnings DB64360: Fix GCC 4.6 build warnings board/cray/L1/flash.c: Fix GCC 4.6 build warning drivers/block/sata_dwc.c: Fix GCC 4.6 build warning board/amirix/ap1000/flash.c: Fix GCC 4.6 build warning alpr board: Fix GCC 4.6 build warnings image: Don't detect XIP images as overlapping. image: Implement IH_TYPE_KERNEL_NOLOAD ppc4xx: Add Io64 board support ppc4xx: fix PMC440 painit command ppc4xx: remove invalid access to PCI_BRDGOPT2 register ppc4xx: use CONFIG_PCI_BOOTDELAY instead of private implementation mpc85xx: support for Freescale COM Express P2020 arch/powerpc/cpu/mpc8xxx/ddr/interactive.c: Fix GCC 4.6 build warning mpc85xx: support board-specific reset function powerpc/85xx: verify the localbus device tree address before booting the OS mpc8xxx: update module_type values from JEDEC DDR3 SPD Specification powerpc/p3060qds: Add board related support for P3060QDS platform powerpc/85xx: clean up and document the QE/FMAN microcode macros powerpc/85xx: always implement the work-around for Erratum SATA_A001 powerpc/85xx: CONFIG_FSL_SATA_V2 should be defined in config_mpc85xx.h powerpc/85xx: Add workaround for erratum A-003474 powerpc/85xx: fixup flexcan device tree clock-frequency powerpc/85xx: Add workaround for erratum CPU-A003999 x86: Fix some bugs in the i8402 driver when no controller is present x86: Make the i8042 driver checkpatch clean x86: Wrap small helper functions from libgcc to avoid an ABI mismatch x86: Import the glibc memset implementation x86: Fix a few recently added bugs x86: Don't relocate symbols which point to things that aren't relocated x86: Fix how the location of the realmode and bios blobs are calculated x86: Misc cleanups x86: Misc PCI touchups x86: Ensure IDT and GDT remain 16-byte aligned post relocation x86: Provide more configuration granularity x86: Add multiboot header sc520: Create arch asm-offsets x86: Punt cold- and warm-boot flags cosmetic: checkpatch cleanup of board/eNET/*.c cosmetic: checkpatch cleanup of arch/x86/lib/*.c cosmetic: checkpatch cleanup of arch/x86/cpu/sc520/*.c cosmetic: checkpatch cleanup of arch/x86/cpu/*.c x86: Call hang() on unrecoverable exception menu.c: use puts() instead of printf() where possible MAKEALL: drop obsolete mx31pdk_nand target dataflash: fix parameters order in write_dataflash() hawkboard: Replace HAWKBOARD_KICK{0, 1}_UNLOCK defines davinci_sonata: define CONFIG_MACH_TYPE for davinci_sonata board davinci_schmoogie: define CONFIG_MACH_TYPE for davinci_schmoogie board arm: a320evb: define mach-type in board config file OMAP3: Use sdelay from arch/arm/cpu/armv7/syslib.c instead of cloning that. Fix Stelian's email address DIU: 1080P and 720P support CFB: Fix font rendering on mx5 framebuffer
Diffstat (limited to 'arch/x86/lib/string.c')
-rw-r--r--arch/x86/lib/string.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/x86/lib/string.c b/arch/x86/lib/string.c
new file mode 100644
index 0000000000..f2ea7e4e33
--- /dev/null
+++ b/arch/x86/lib/string.c
@@ -0,0 +1,87 @@
+/*
+ * 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.
+ *
+ * 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 <compiler.h>
+#include <asm/string.h>
+#include <linux/types.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;
+}