[OpenSPARC-T2-SAM] / hypervisor / src / sample / lib / __align_cpy_8.s

/*
* ========== Copyright Header Begin ==========================================
*
* Hypervisor Software File: __align_cpy_8.s
* 
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
* 
*  - Do no alter or remove copyright notices
* 
*  - Redistribution and use of this software in source and binary forms, with 
*    or without modification, are permitted provided that the following 
*    conditions are met: 
* 
*  - Redistribution of source code must retain the above copyright notice, 
*    this list of conditions and the following disclaimer.
* 
*  - Redistribution 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. 
* 
*    Neither the name of Sun Microsystems, Inc. or the names of contributors 
* may be used to endorse or promote products derived from this software 
* without specific prior written permission. 
* 
*     This software is provided "AS IS," without a warranty of any kind. 
* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, 
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A 
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN 
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR 
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR 
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN 
* OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR 
* FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE 
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, 
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF 
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
* 
* You acknowledge that this software is not designed, licensed or
* intended for use in the design, construction, operation or maintenance of
* any nuclear facility. 
* 
* ========== Copyright Header End ============================================
*/
/*
 * Copyright (c) 1997, Sun Microsystems, Inc.
 * All rights reserved.
 */

.ident "@(#)__align_cpy_8.s 1.1     97/02/10 SMI"

	.file "__align_cpy_8.s"

/* __align_cpy_8(s1, s2, n)
 *
 * Copy 8-byte aligned source to 8-byte aligned target in multiples of 8 bytes.
 *
 * Input:
 *	o0	address of target
 *	o1	address of source
 *	o2	number of bytes to copy (must be a multiple of 8)
 * Output:
 *	o0	address of target
 * Caller's registers that have been changed by this function:
 *	o1-o5
 *
 * Note:
 *	This helper routine will not be used by any 32-bit compilations. To do
 *	so would break binary compatibility with previous versions of Solaris.
 *
 * Assumptions:
 *	Source and target addresses are 8-byte aligned.
 *	Bytes to be copied are non-overlapping or _exactly_ overlapping.
 *	The number of bytes to be copied is a multiple of 8.
 *	Call will _usually_ be made with a byte count of more than 4*8 and
 *	less than a few hundred bytes.  Legal values are 0 to MAX_SIZE_T.
 *
 * Optimization attempt:
 *	Reasonable speed for a generic v9.  Going for 32 bytes at a time
 *	rather than 16 bytes at a time did not result in a time saving for
 *	the number of bytes expected to be copied.  No timing runs using other
 *	levels of optimization have been tried yet.
 *
 * Even when multiples of 16 bytes were used, the savings by going for 32 bytes
 * at a time were about 2%.  Thus, __align_cpy_16 is a second entry point to
 * the same code as __align_cpy_8.
 *
 * Register usage:
 *	o1	source address (updated for each read)
 *	o2	byte count remaining
 *	o3	contents being copied
 *	o4	more contents being copied
 *	o5	target address
 */

#include <sys/asm_linkage.h>

!#include "synonyms.h"

	ENTRY(__align_cpy_8)
	ENTRY(__align_cpy_16)
	cmp	%o0, %o1		! Identical--do nothing.
	be,pn	%xcc, .done
	subcc	%o2, 8, %o2
	bz,pn	%xcc, .wrdbl2		! Only 8 bytes need to be copied.
	mov	%o0, %o5		! Original target address is returned.
	bpos,a,pt %xcc, .wrdbl1		! Have at least 16 bytes to copy.
	ldx	[%o1], %o3
.done:
	retl				! No bytes to copy.
	nop
	
	.align	32
.wrdbl1:				! Copy 16 bytes at a time.
	subcc	%o2, 16, %o2
	ldx	[%o1+8], %o4
	add	%o1, 16, %o1
	stx	%o3, [%o5]
	stx	%o4, [%o5+8]
	add	%o5, 16, %o5
	bg,a,pt	%xcc, .wrdbl1		! Have at least 16 more bytes.
	ldx	[%o1], %o3

	bz,a,pt	%xcc, .wrdbl3		! Have 8 bytes remaining to copy.
	ldx	[%o1], %o3

	retl
	nop

.wrdbl2:
	ldx	[%o1], %o3		! Copy last 8 bytes.
.wrdbl3:
	stx	%o3, [%o5]
	retl
	nop

	SET_SIZE(__align_cpy_8)
	SET_SIZE(__align_cpy_16)
Commit	Line	Data
920dae64 AT	1	/*
	2	* ========== Copyright Header Begin ==========================================
	3	*
	4	* Hypervisor Software File: __align_cpy_8.s
	5	*
	6	* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
	7	*
	8	* - Do no alter or remove copyright notices
	9	*
	10	* - Redistribution and use of this software in source and binary forms, with
	11	* or without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistribution of source code must retain the above copyright notice,
	15	* this list of conditions and the following disclaimer.
	16	*
	17	* - Redistribution in binary form must reproduce the above copyright notice,
	18	* this list of conditions and the following disclaimer in the
	19	* documentation and/or other materials provided with the distribution.
	20	*
	21	* Neither the name of Sun Microsystems, Inc. or the names of contributors
	22	* may be used to endorse or promote products derived from this software
	23	* without specific prior written permission.
	24	*
	25	* This software is provided "AS IS," without a warranty of any kind.
	26	* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
	27	* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
	28	* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
	29	* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
	30	* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
	31	* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
	32	* OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
	33	* FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
	34	* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
	35	* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
	36	* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
	37	*
	38	* You acknowledge that this software is not designed, licensed or
	39	* intended for use in the design, construction, operation or maintenance of
	40	* any nuclear facility.
	41	*
	42	* ========== Copyright Header End ============================================
	43	*/
	44	/*
	45	* Copyright (c) 1997, Sun Microsystems, Inc.
	46	* All rights reserved.
	47	*/
	48
	49	.ident "@(#)__align_cpy_8.s 1.1 97/02/10 SMI"
	50
	51	.file "__align_cpy_8.s"
	52
	53	/* __align_cpy_8(s1, s2, n)
	54	*
	55	* Copy 8-byte aligned source to 8-byte aligned target in multiples of 8 bytes.
	56	*
	57	* Input:
	58	* o0 address of target
	59	* o1 address of source
	60	* o2 number of bytes to copy (must be a multiple of 8)
	61	* Output:
	62	* o0 address of target
	63	* Caller's registers that have been changed by this function:
	64	* o1-o5
65	*
66	* Note:
67	* This helper routine will not be used by any 32-bit compilations. To do
68	* so would break binary compatibility with previous versions of Solaris.
69	*
70	* Assumptions:
71	* Source and target addresses are 8-byte aligned.
72	* Bytes to be copied are non-overlapping or _exactly_ overlapping.
73	* The number of bytes to be copied is a multiple of 8.
74	* Call will _usually_ be made with a byte count of more than 4*8 and
75	* less than a few hundred bytes. Legal values are 0 to MAX_SIZE_T.
76	*
77	* Optimization attempt:
78	* Reasonable speed for a generic v9. Going for 32 bytes at a time
79	* rather than 16 bytes at a time did not result in a time saving for
80	* the number of bytes expected to be copied. No timing runs using other
81	* levels of optimization have been tried yet.
82	*
83	* Even when multiples of 16 bytes were used, the savings by going for 32 bytes
84	* at a time were about 2%. Thus, __align_cpy_16 is a second entry point to
85	* the same code as __align_cpy_8.
86	*
87	* Register usage:
88	* o1 source address (updated for each read)
89	* o2 byte count remaining
90	* o3 contents being copied
91	* o4 more contents being copied
92	* o5 target address
93	*/
94
95	#include <sys/asm_linkage.h>
96
97	!#include "synonyms.h"
98
99	ENTRY(__align_cpy_8)
100	ENTRY(__align_cpy_16)
101	cmp %o0, %o1 ! Identical--do nothing.
102	be,pn %xcc, .done
103	subcc %o2, 8, %o2
104	bz,pn %xcc, .wrdbl2 ! Only 8 bytes need to be copied.
105	mov %o0, %o5 ! Original target address is returned.
106	bpos,a,pt %xcc, .wrdbl1 ! Have at least 16 bytes to copy.
107	ldx [%o1], %o3
108	.done:
109	retl ! No bytes to copy.
110	nop
111
112	.align 32
113	.wrdbl1: ! Copy 16 bytes at a time.
114	subcc %o2, 16, %o2
115	ldx [%o1+8], %o4
116	add %o1, 16, %o1
117	stx %o3, [%o5]
118	stx %o4, [%o5+8]
119	add %o5, 16, %o5
120	bg,a,pt %xcc, .wrdbl1 ! Have at least 16 more bytes.
121	ldx [%o1], %o3
122
123	bz,a,pt %xcc, .wrdbl3 ! Have 8 bytes remaining to copy.
124	ldx [%o1], %o3
125
126	retl
127	nop
128
129	.wrdbl2:
130	ldx [%o1], %o3 ! Copy last 8 bytes.
131	.wrdbl3:
132	stx %o3, [%o5]
133	retl
134	nop
135
136	SET_SIZE(__align_cpy_8)
137	SET_SIZE(__align_cpy_16)