* ========== Copyright Header Begin ==========================================
* OpenSPARC T2 Processor File: tso_n1_dekker2_pio.s
* Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved
* 4150 Network Circle, Santa Clara, California 95054, U.S.A.
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* ========== Copyright Header End ============================================
#define MAIN_PAGE_HV_ALSO
#define data_base_reg %o3
#define global_cnt_reg %o6
setx addrA, %l0, addrA_reg !
setx addrB, %l0, addrB_reg !
setx addrC, %l0, addrC_reg !
set TIMEOUT, to_reg ! set timeout count
set ITERATIONS, global_cnt_reg !
add my_id_reg, 0x20, my_id_reg ! this is my ID address
set 1, test_reg1 ! load the swap data register
set 0x20, test_reg2 ! load the swap data register
st test_reg1, [addrA_reg] ! try to acquire lock
st test_reg2, [addrC_reg] ! try to acquire lock
ld [addrC_reg], test_reg2
ld [addrB_reg], test_reg1 ! try to acquire lock
st %g0, [addrA_reg] ! release
deccc to_reg ! dec timeout count
bne getlock0 ! branch if no timeout
subcc test_reg2, 0x20, %g0
st %g0, [addrA_reg] ! lock value (0=unlocked)
nop;nop;nop;nop; ! backoff
set TIMEOUT, to_reg ! set timeout count again
setx addrA, %l0, addrA_reg !
setx addrB, %l0, addrB_reg !
setx addrC, %l0, addrC_reg !
set TIMEOUT, to_reg ! set timeout count
set ITERATIONS, global_cnt_reg !
add my_id_reg, 0x24, my_id_reg
set 1, test_reg1 ! load the swap data register
set 0x21, test_reg2 ! load the swap data register
st test_reg1, [addrB_reg] ! try to acquire lock
st test_reg2, [addrC_reg] ! try to acquire lock
ld [addrC_reg], test_reg2
ld [addrA_reg], test_reg1 ! try to acquire lock
st %g0, [addrB_reg] ! release
sub backoff_hlp1, to_reg, backoff_cnt
nop;nop;nop;nop; ! wait - quasi exponential backoff
deccc backoff_cnt ! well, kinda linear.
deccc to_reg ! dec timeout count
bne getlock1 ! branch if no timeout
subcc test_reg2, 0x21, %g0
st %g0, [addrB_reg] ! lock value (0=unlocked)
set TIMEOUT, to_reg ! set timeout count again
!==========================
SECTION .MY_DATA0 DATA_VA=0xd0100000
part_0_ctx_nonzero_tsb_config_0,
TTE_G=1, TTE_Context=0x44, TTE_V=1, TTE_Size=0, TTE_NFO=0,
TTE_IE=0, TTE_Soft2=0, TTE_Diag=0, TTE_Soft=0,
TTE_L=0, TTE_CP=1, TTE_CV=0, TTE_E=0, TTE_P=0, TTE_W=1
SECTION .MY_DATA1 DATA_VA=0xd1110000
part_0_ctx_nonzero_tsb_config_1,
TTE_G=1, TTE_Context=0x44, TTE_V=1, TTE_Size=0, TTE_NFO=0,
TTE_IE=0, TTE_Soft2=0, TTE_Diag=0, TTE_Soft=0,
TTE_L=0, TTE_CP=1, TTE_CV=0, TTE_E=0, TTE_P=0, TTE_W=1