[OpenSPARC-T2-SAM] / sam-t2 / sam / system / util / barrier_subr_v9.s

/*
* ========== Copyright Header Begin ==========================================
* 
* OpenSPARC T2 Processor File: barrier_subr_v9.s
* Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.
* 
* The above named program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
* 
* The above named 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 work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
* 
* ========== Copyright Header End ============================================
*/
#ifdef ARCH_X64

/*
 * void barrier(uint32_t loopticks)
 * Hmm, this function is not used anymore and should be deleted.
 * In fact, the following files should be deleted:
 * system/util/barrier_subr_v9.s
 * system/util/barrier_subr_v8.s
 * system/util/include/barrier.h
 * system/util/barrier.cc
 * and all references to cpu_barrier
*/
	
#else
	
#pragma ident "@(#)1.3	07/07/10	barrier_subr_v9.s"

#include <sys/asm_linkage.h>

#if 0
	
	ENTRY(barrier)
	ldx	[%o0+24], %o1			! load bp->sbp into %o1

	! atomic decrement of running count
	add	%o1, 4, %o2
retry:	ld	[%o2], %o3
	add	%o3, -1, %o4
	cas	[%o2], %o3, %o4
	cmp	%o3, %o4
	bne	retry
	nop

	! check if this is the last one
	cmp	%o3, 1
	bne	wait
	nop

	! YES, switch sub-barriers, reset count and CV
	add	%o0, 4, %o2			! %o2 = &bp->sb[0]
	cmp	%o1, %o2
	bne	1f
	nop
	add	%o0, 12, %o2			! %o2 = &bp->sb[1]
1:	stx	%o2, [%o0 + 24]			! store %o2 into bp->sbp
	set	1, %o4
	st	%o4, [%o2]
	ld	[%o0], %o3
	st	%o3, [%o2 + 4]

	! release the CV busy-waiters
	retl
	clr	[%o1]

	! NO, busy-wait on CV
wait:	ld	[%o1], %o2
	tst	%o2
	bne	wait
	nop
	retl
	nop
	SET_SIZE(barrier)

#else

	.global cpu_barrier
	ENTRY(barrier)
	or       %o0, 0, %o5                    ! loopticks
	setx    cpu_barrier, %o2, %o0	
	ldx	[%o0 + 24], %o1			! load bp->sbp into %o1
        ldx	[%o0 + 32], %o0                 !!!!!! global tick pointer
		
	! atomic decrement of running count
	add	%o1, 4, %o2
retry:	ld	[%o2], %o3
	add	%o3, -1, %o4
	cas	[%o2], %o3, %o4
	cmp	%o3, %o4
	bne	retry
	nop

retry1:	ldx     [%o0], %o2           !!  global_tick + looptick
	add     %o2, %o5, %o4        !!
	casx    [%o0], %o2, %o4      !!
	cmp     %o2, %o4             !!
	bne,pn  %xcc, retry1                   
	nop                          !!
	
	! check if this is the last one
	cmp	%o3, 1
	bne	wait
	nop

	! YES, switch sub-barriers, reset count and CV
	setx     cpu_barrier, %o2, %o0		
	add	%o0, 4, %o2			! %o2 = &bp->sb[0]
	cmp	%o1, %o2
	bne	1f
	nop
	add	%o0, 12, %o2			! %o2 = &bp->sb[1]
1:	stx	%o2, [%o0 + 24]			! store %o2 into bp->sbp
	set	1, %o4
	st	%o4, [%o2]
	ld	[%o0], %o3
	st	%o3, [%o2 + 4]

	! release the CV busy-waiters
	retl
	clr	[%o1]

	! NO, busy-wait on CV
wait:	ld	[%o1], %o2
	tst	%o2
	bne	wait
	nop
	retl
	nop
	SET_SIZE(barrier)
	
#endif


#endif
Commit	Line	Data
920dae64 AT	1	/*
	2	* ========== Copyright Header Begin ==========================================
	3	*
	4	* OpenSPARC T2 Processor File: barrier_subr_v9.s
	5	* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
	6	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.
	7	*
	8	* The above named program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public
	10	* License version 2 as published by the Free Software Foundation.
	11	*
	12	* The above named program is distributed in the hope that it will be
	13	* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public
	18	* License along with this work; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
	20	*
	21	* ========== Copyright Header End ============================================
	22	*/
	23	#ifdef ARCH_X64
	24
	25	/*
	26	* void barrier(uint32_t loopticks)
	27	* Hmm, this function is not used anymore and should be deleted.
	28	* In fact, the following files should be deleted:
	29	* system/util/barrier_subr_v9.s
	30	* system/util/barrier_subr_v8.s
	31	* system/util/include/barrier.h
	32	* system/util/barrier.cc
	33	* and all references to cpu_barrier
	34	*/
	35
	36	#else
	37
	38	#pragma ident "@(#)1.3 07/07/10 barrier_subr_v9.s"
	39
	40	#include <sys/asm_linkage.h>
	41
	42	#if 0
	43
	44	ENTRY(barrier)
	45	ldx [%o0+24], %o1 ! load bp->sbp into %o1
	46
	47	! atomic decrement of running count
	48	add %o1, 4, %o2
	49	retry: ld [%o2], %o3
	50	add %o3, -1, %o4
	51	cas [%o2], %o3, %o4
	52	cmp %o3, %o4
	53	bne retry
	54	nop
	55
	56	! check if this is the last one
	57	cmp %o3, 1
	58	bne wait
	59	nop
	60
	61	! YES, switch sub-barriers, reset count and CV
	62	add %o0, 4, %o2 ! %o2 = &bp->sb[0]
	63	cmp %o1, %o2
	64	bne 1f
65	nop
66	add %o0, 12, %o2 ! %o2 = &bp->sb[1]
67	1: stx %o2, [%o0 + 24] ! store %o2 into bp->sbp
68	set 1, %o4
69	st %o4, [%o2]
70	ld [%o0], %o3
71	st %o3, [%o2 + 4]
72
73	! release the CV busy-waiters
74	retl
75	clr [%o1]
76
77	! NO, busy-wait on CV
78	wait: ld [%o1], %o2
79	tst %o2
80	bne wait
81	nop
82	retl
83	nop
84	SET_SIZE(barrier)
85
86	#else
87
88	.global cpu_barrier
89	ENTRY(barrier)
90	or %o0, 0, %o5 ! loopticks
91	setx cpu_barrier, %o2, %o0
92	ldx [%o0 + 24], %o1 ! load bp->sbp into %o1
93	ldx [%o0 + 32], %o0 !!!!!! global tick pointer
94
95	! atomic decrement of running count
96	add %o1, 4, %o2
97	retry: ld [%o2], %o3
98	add %o3, -1, %o4
99	cas [%o2], %o3, %o4
100	cmp %o3, %o4
101	bne retry
102	nop
103
104	retry1: ldx [%o0], %o2 !! global_tick + looptick
105	add %o2, %o5, %o4 !!
106	casx [%o0], %o2, %o4 !!
107	cmp %o2, %o4 !!
108	bne,pn %xcc, retry1
109	nop !!
110
111	! check if this is the last one
112	cmp %o3, 1
113	bne wait
114	nop
115
116	! YES, switch sub-barriers, reset count and CV
117	setx cpu_barrier, %o2, %o0
118	add %o0, 4, %o2 ! %o2 = &bp->sb[0]
119	cmp %o1, %o2
120	bne 1f
121	nop
122	add %o0, 12, %o2 ! %o2 = &bp->sb[1]
123	1: stx %o2, [%o0 + 24] ! store %o2 into bp->sbp
124	set 1, %o4
125	st %o4, [%o2]
126	ld [%o0], %o3
127	st %o3, [%o2 + 4]
128
129	! release the CV busy-waiters
130	retl
131	clr [%o1]
132
133	! NO, busy-wait on CV
134	wait: ld [%o1], %o2
135	tst %o2
136	bne wait
137	nop
138	retl
139	nop
140	SET_SIZE(barrier)
141
142	#endif
143
144
145	#endif