Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / x86 / lib / string.c

diff --git a/qemu/roms/u-boot/arch/x86/lib/string.c b/qemu/roms/u-boot/arch/x86/lib/string.c
new file mode 100644 (file)
index 0000000..a1656cc
--- /dev/null
+++ b/qemu/roms/u-boot/arch/x86/lib/string.c
@@ -0,0 +1,132 @@
+/*
+ * 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.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+/* 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;
+}
+
+#define        OP_T_THRES      8
+#define OPSIZ  (sizeof(op_t))
+
+#define BYTE_COPY_FWD(dst_bp, src_bp, nbytes)                            \
+do {                                                                     \
+       int __d0;                                                         \
+       asm volatile(                                                     \
+               /* Clear the direction flag, so copying goes forward.  */ \
+               "cld\n"                                                   \
+               /* Copy bytes.  */                                        \
+               "rep\n"                                                   \
+               "movsb" :                                                 \
+               "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) :               \
+               "0" (dst_bp), "1" (src_bp), "2" (nbytes) :                \
+               "memory");                                                \
+} while (0)
+
+#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes)               \
+do {                                                                     \
+       int __d0;                                                         \
+       asm volatile(                                                     \
+               /* Clear the direction flag, so copying goes forward.  */ \
+               "cld\n"                                                   \
+               /* Copy longwords.  */                                    \
+               "rep\n"                                                   \
+               "movsl" :                                                 \
+               "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) :               \
+               "0" (dst_bp), "1" (src_bp), "2" ((nbytes) / 4) :          \
+               "memory");                                                \
+       (nbytes_left) = (nbytes) % 4;                                     \
+} while (0)
+
+void *memcpy(void *dstpp, const void *srcpp, size_t len)
+{
+       unsigned long int dstp = (long int)dstpp;
+       unsigned long int srcp = (long int)srcpp;
+
+       /* Copy from the beginning to the end.  */
+
+       /* If there not too few bytes to copy, use word copy.  */
+       if (len >= OP_T_THRES) {
+               /* Copy just a few bytes to make DSTP aligned.  */
+               len -= (-dstp) % OPSIZ;
+               BYTE_COPY_FWD(dstp, srcp, (-dstp) % OPSIZ);
+
+               /* Copy from SRCP to DSTP taking advantage of the known
+                * alignment of DSTP.  Number of bytes remaining is put
+                * in the third argument, i.e. in LEN.  This number may
+                * vary from machine to machine.
+                */
+               WORD_COPY_FWD(dstp, srcp, len, len);
+
+               /* Fall out and copy the tail.  */
+       }
+
+       /* There are just a few bytes to copy. Use byte memory operations. */
+       BYTE_COPY_FWD(dstp, srcp, len);
+
+       return dstpp;
+}