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| author | Dan McDonald <danmcd@mnx.io> | 2022-05-13 17:20:24 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-05-13 17:20:24 -0400 |
| commit | bb7d6c9b47695f41cbacbcf6662baf3d0e152fdf (patch) | |
| tree | 75f2d0cab5fb92f97f2ab2c3186a0b5d1579a33a /usr/src/uts/intel/ml/ovbcopy.s | |
| parent | 8ca5534c77e93c25d2c1f777499b12da0f7cc0cd (diff) | |
| parent | 402559e299331588f209b3a9693e3bcd6a83d22c (diff) | |
| download | illumos-joyent-OS-8149.tar.gz | |
Merge branch 'master' into OS-8149OS-8149
Diffstat (limited to 'usr/src/uts/intel/ml/ovbcopy.s')
| -rw-r--r-- | usr/src/uts/intel/ml/ovbcopy.s | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/usr/src/uts/intel/ml/ovbcopy.s b/usr/src/uts/intel/ml/ovbcopy.s new file mode 100644 index 0000000000..0687e67e4b --- /dev/null +++ b/usr/src/uts/intel/ml/ovbcopy.s @@ -0,0 +1,92 @@ +/* + * Copyright 2004 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +/* + * Copyright 2019 Joyent, Inc. + */ + +/*- + * Copyright (c) 1993 The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD: src/sys/amd64/amd64/support.S,v 1.102 2003/10/02 05:08:13 alc Exp $ + */ + +#include <sys/asm_linkage.h> + +/* + * Adapted from fbsd bcopy(). + * + * bcopy(src, dst, cnt) + * rdi, rsi, rdx + * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 + */ + + ENTRY(ovbcopy) + xchgq %rsi,%rdi + movq %rdx,%rcx + + movq %rdi,%rax + subq %rsi,%rax + cmpq %rcx,%rax /* overlapping && src < dst? */ + jb reverse + + shrq $3,%rcx /* copy by 64-bit words */ + cld /* nope, copy forwards */ + rep + movsq + movq %rdx,%rcx + andq $7,%rcx /* any bytes left? */ + rep + movsb + ret + +reverse: + addq %rcx,%rdi /* copy backwards */ + addq %rcx,%rsi + decq %rdi + decq %rsi + andq $7,%rcx /* any fractional bytes? */ + std + rep + movsb + movq %rdx,%rcx /* copy remainder by 32-bit words */ + shrq $3,%rcx + subq $7,%rsi + subq $7,%rdi + rep + movsq + cld + ret + SET_SIZE(ovbcopy) + |