/*
* ========== Copyright Header Begin ==========================================
* 
* OpenSPARC T2 Processor File: tso_n1_indirection1.s
* Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved
* 4150 Network Circle, Santa Clara, California 95054, U.S.A.
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
* For the avoidance of doubt, and except that if any non-GPL license 
* choice is available it will apply instead, Sun elects to use only 
* the General Public License version 2 (GPLv2) at this time for any 
* software where a choice of GPL license versions is made 
* available with the language indicating that GPLv2 or any later version 
* may be used, or where a choice of which version of the GPL is applied is 
* otherwise unspecified. 
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 
* CA 95054 USA or visit www.sun.com if you need additional information or 
* have any questions. 
*
* 
* ========== Copyright Header End ============================================
*/
#define tmp0	  		%i0
#define tmp1			%i1
#define tmp2			%i2
#define tmp3			%i3

#define global_cnt_reg	  	%i4

#define addrA_reg  		%l0
#define addrB_reg		%l1
#define addrC_reg		%l2
#define result0_reg	  	%l3
#define result1_reg	  	%l4
#define ready0_reg	  	%l5
#define ready1_reg	  	%l6
#define finish_reg	  	%l7

#define test_reg		%o4
#define test2_reg		%o5

#define ITERATIONS 	  	0x4

#include "hboot.s"

.global main

main:

	setx    addrA,		tmp0, addrA_reg
	setx    addrB, 		tmp0, addrB_reg
	setx    addrC, 		tmp0, addrC_reg
	setx    result0, 	tmp0, result0_reg
	setx    result1, 	tmp0, result1_reg
	setx    ready0, 	tmp0, ready0_reg
	setx    ready1, 	tmp0, ready1_reg
	setx    finish_area,	tmp0, finish_reg

        set     ITERATIONS,	global_cnt_reg

th_fork(th_main,tmp1)

!=====================================================
th_main_0:
loop00:

	mov	0x21,	tmp1
	mov	0x1,	tmp2
	st	tmp1, [addrA_reg]
	st	tmp2, [addrB_reg]		! store non-zero to B

! BARRIER here
!=============
        set     barrier_code, tmp0
        jmpl    tmp0,%o7
        nop 

	dec	global_cnt_reg
	brz	global_cnt_reg, good_end
	nop

	ba	loop00				! loop
	nop

!=========================================================

#ifdef ZERO_THREE_SIX
th_main_3:
#else 
th_main_1:
#endif
th_main_4:
loop10:						! wait for B to be non-zero
        ld    	[addrA_reg], test_reg
        ld    	[addrB_reg], test_reg
	brz	test_reg, loop10
	nop

	st	test_reg, [addrC_reg]		! store non-zero to C

! BARRIER here
!=============
        set     barrier_code, tmp0
        jmpl    tmp0,%o7
        nop 

	dec	global_cnt_reg
	brz	global_cnt_reg, good_end
	nop
	ba	loop10				! loop
	nop

!=========================================================
#ifdef ZERO_THREE_SIX
th_main_6:
#else
th_main_2:
#endif
th_main_8:

loop30:
        ld    	[addrC_reg], test_reg		! load C until set
	brz	test_reg, loop30
	nop

        ld    	[addrA_reg], tmp1		! check A
	mov	0x21, tmp2
	subcc	tmp2, tmp1, %g0
	bne	bad_end
	nop

	st	%g0,    [addrC_reg]		! clear
	st	%g0,    [addrB_reg]
	st	%g0,    [addrA_reg]

! barrier here
!=============
        set     barrier_code,tmp0
        jmpl    tmp0,%o7
        nop 

	dec	global_cnt_reg
	brz	global_cnt_reg, good_end
	nop

	ba	loop30				! loop
	nop

!=x========================================================================

! all threads synchronize at this point.
barrier_code:
        setx    barrier_data, tmp1, tmp2
	sll	global_cnt_reg, 0x3, tmp1
	add	tmp1, tmp2, tmp2
bloop1:						! get lock of barrier count
        mov     0xff, tmp1
        cas     [tmp2], %g0, tmp1
        brnz    tmp1, bloop1
#ifdef PREFETCH
        prefetch [tmp2], #n_reads
#else
        nop
#endif
        ld      [tmp2 + 4], tmp3		! increment
        inc     tmp3
        st      tmp3, [tmp2 + 4]

        st      %g0, [tmp2]          		! unlock

bloop2: 					! check the barrier count
        ld      [tmp2 + 4], tmp3		! if 0 ->
        brz     tmp3, bout2  		  	! somebody already reset it
        sub     tmp3, THREAD_COUNT, tmp3	! subtract THREAD_COUNT
        brnz    tmp3, bloop2      		! if 0 -> we are out.
#ifdef PREFETCH
        prefetch [tmp2], #n_reads
#else
        nop
#endif
        
        st      %g0, [tmp2 + 4] 		! clear the barrier counter
bout2:
        jmpl    %o7+8, %g0      		! return
        nop

good_end:
        ta      T_GOOD_TRAP
bad_end:
        ta      T_BAD_TRAP

!==================================================

	.data

.global addrA
.align 0x40
addrA:
	.word 0x0
	.skip 0x100
.global result0
result0:
	.word	0x0
.global ready0
ready0:
	.word	0x0

.global addrB
addrB:
	.word	0x0
	.skip 0x100
.global result1
result1:
	.word	0x0
.global ready1
ready1:
	.word	0x0
	
.global finish_area
finish_area:
	.word	0x0

.align 0x40
.global addrC
addrC:
	.word	0x0
	.skip 0x100

.global barrier_data
barrier_data:
        .skip   0x100

.end