/* Copyright 2002 Andi Kleen, SuSE Labs */

#include <linux/linkage.h>
#include <asm/cpufeatures.h>
#include <asm/alternative-asm.h>

.weak memset

/*
 * ISO C memset - set a memory block to a byte value. This function uses fast
 * string to get better performance than the original function. The code is
 * simpler and shorter than the original function as well.
 *
 * rdi   destination
 * rsi   value (char)
 * rdx   count (bytes)
 *
 * rax   original destination
 */
ENTRY(memset)
ENTRY(__memset)
	/*
	 * Some CPUs support enhanced REP MOVSB/STOSB feature. It is recommended
	 * to use it when possible. If not available, use fast string instructions.
	 *
	 * Otherwise, use original memset function.
	 */
	ALTERNATIVE_2 "jmp memset_orig", "", X86_FEATURE_REP_GOOD, \
		      "jmp memset_erms", X86_FEATURE_ERMS

	movq %rdi,%r9
	movq %rdx,%rcx
	andl $7,%edx
	shrq $3,%rcx
	/* expand byte value  */
	movzbl %sil,%esi
	movabs $0x0101010101010101,%rax
	imulq %rsi,%rax
	rep stosq
	movl %edx,%ecx
	rep stosb
	movq %r9,%rax
	ret
ENDPROC(memset)
ENDPROC(__memset)

/*
 * ISO C memset - set a memory block to a byte value. This function uses
 * enhanced rep stosb to override the fast string function.
 * The code is simpler and shorter than the fast string function as well.
 *
 * rdi   destination
 * rsi   value (char)
 * rdx   count (bytes)
 *
 * rax   original destination
 */
ENTRY(memset_erms)
	movq %rdi,%r9
	movb %sil,%al
	movq %rdx,%rcx
	rep stosb
	movq %r9,%rax
	ret
ENDPROC(memset_erms)

ENTRY(memset_orig)
	movq %rdi,%r10

	/* expand byte value  */
	movzbl %sil,%ecx
	movabs $0x0101010101010101,%rax
	imulq  %rcx,%rax

	/* align dst */
	movl  %edi,%r9d
	andl  $7,%r9d
	jnz  .Lbad_alignment
.Lafter_bad_alignment:

	movq  %rdx,%rcx
	shrq  $6,%rcx
	jz	 .Lhandle_tail

	.p2align 4
.Lloop_64:
	decq  %rcx
	movq  %rax,(%rdi)
	movq  %rax,8(%rdi)
	movq  %rax,16(%rdi)
	movq  %rax,24(%rdi)
	movq  %rax,32(%rdi)
	movq  %rax,40(%rdi)
	movq  %rax,48(%rdi)
	movq  %rax,56(%rdi)
	leaq  64(%rdi),%rdi
	jnz    .Lloop_64

	/* Handle tail in loops. The loops should be faster than hard
	   to predict jump tables. */
	.p2align 4
.Lhandle_tail:
	movl	%edx,%ecx
	andl    $63&(~7),%ecx
	jz 		.Lhandle_7
	shrl	$3,%ecx
	.p2align 4
.Lloop_8:
	decl   %ecx
	movq  %rax,(%rdi)
	leaq  8(%rdi),%rdi
	jnz    .Lloop_8

.Lhandle_7:
	andl	$7,%edx
	jz      .Lende
	.p2align 4
.Lloop_1:
	decl    %edx
	movb 	%al,(%rdi)
	leaq	1(%rdi),%rdi
	jnz     .Lloop_1

.Lende:
	movq	%r10,%rax
	ret

.Lbad_alignment:
	cmpq $7,%rdx
	jbe	.Lhandle_7
	movq %rax,(%rdi)	/* unaligned store */
	movq $8,%r8
	subq %r9,%r8
	addq %r8,%rdi
	subq %r8,%rdx
	jmp .Lafter_bad_alignment
.Lfinal:
ENDPROC(memset_orig)
ion>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>gadget</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/legacy?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>legacy</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='9a393b5d5988ea4eaa3e0da138321abe0dc03a68'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Sainath Grandhi &lt;sainath.grandhi@intel.com&gt;</td><td class='right'>2017-02-10 16:03:51 -0800</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-11 20:59:41 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/legacy?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>9a393b5d5988ea4eaa3e0da138321abe0dc03a68</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/gadget/legacy?id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>5a006ee32965ff9c76984aa7ce7c870d966be7ac</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/gadget/legacy?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>drivers/usb/gadget/legacy</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/legacy?h=nds-private-remove&amp;id=d9f1f61c0801a73ff36d416a7ede54229b231e1d'>d9f1f61c0801a73ff36d416a7ede54229b231e1d</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/gadget/legacy?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68&amp;id2=d9f1f61c0801a73ff36d416a7ede54229b231e1d'>diff</a>)</td></tr></table>
<div class='commit-subject'>tap: tap as an independent module</div><div class='commit-msg'>This patch makes tap a separate module for other types of virtual interfaces, for example,
ipvlan to use.

Signed-off-by: Sainath Grandhi &lt;sainath.grandhi@intel.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=9a393b5d5988ea4eaa3e0da138321abe0dc03a68'>Diffstat</a> (limited to 'drivers/usb/gadget/legacy')</div><table summary='diffstat' class='diffstat'>