/* * ========== 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. * * 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 MAIN_PAGE_HV_ALSO #define addrA_reg %o0 #define addrB_reg %o1 #define addrC_reg %o2 #define data_base_reg %o3 #define to_reg %o4 #define my_id_reg %o5 #define global_cnt_reg %o6 #define test_reg1 %i0 #define test_reg2 %i1 #define backoff_cnt %i4 #define backoff_hlp1 %i5 #define TIMEOUT 0x100 #define ITERATIONS 0x2 #include "hboot.s" .global main main: ta T_CHANGE_HPRIV nop th_fork(th_main,%l0) th_main_0: setx addrA, %l0, addrA_reg ! setx addrB, %l0, addrB_reg ! setx addrC, %l0, addrC_reg ! set TIMEOUT, to_reg ! set timeout count inc to_reg mov to_reg, backoff_hlp1 dec to_reg set ITERATIONS, global_cnt_reg ! mov %g0, my_id_reg add my_id_reg, 0x20, my_id_reg ! this is my ID address getlock0: 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 membar 0x40 ld [addrC_reg], test_reg2 ld [addrB_reg], test_reg1 ! try to acquire lock tst test_reg1 be gotlock0 nop st %g0, [addrA_reg] ! release deccc to_reg ! dec timeout count bne getlock0 ! branch if no timeout nop ba,a bad_end nop gotlock0: subcc test_reg2, 0x20, %g0 bne bad_end nop clearlock0: st %g0, [addrA_reg] ! lock value (0=unlocked) nop;nop;nop;nop; ! wait mov to_reg, backoff_cnt backoff_loop01: nop;nop;nop;nop; ! backoff deccc backoff_cnt bne backoff_loop01 nop set TIMEOUT, to_reg ! set timeout count again check_done0: deccc global_cnt_reg be good_end nop ba getlock0 nop th_main_1: ba dekker_algo th_main_2: ta T_GOOD_TRAP th_main_3: ta T_GOOD_TRAP th_main_4: ba dekker_algo dekker_algo: setx addrA, %l0, addrA_reg ! setx addrB, %l0, addrB_reg ! setx addrC, %l0, addrC_reg ! set TIMEOUT, to_reg ! set timeout count inc to_reg mov to_reg, backoff_hlp1 dec to_reg set ITERATIONS, global_cnt_reg ! mov %g0, my_id_reg add my_id_reg, 0x24, my_id_reg getlock1: 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 membar 0x40 ld [addrC_reg], test_reg2 ld [addrA_reg], test_reg1 ! try to acquire lock tst test_reg1 be gotlock1 nop st %g0, [addrB_reg] ! release sub backoff_hlp1, to_reg, backoff_cnt backoff_loop10: nop;nop;nop;nop; ! wait - quasi exponential backoff deccc backoff_cnt ! well, kinda linear. bne backoff_loop10 nop deccc to_reg ! dec timeout count bne getlock1 ! branch if no timeout nop ba,a bad_end nop gotlock1: subcc test_reg2, 0x21, %g0 bne bad_end nop clearlock1: st %g0, [addrB_reg] ! lock value (0=unlocked) set TIMEOUT, to_reg ! set timeout count again check_done1: deccc global_cnt_reg be good_end nop ba getlock1 nop good_end: ta T_GOOD_TRAP bad_end: ta T_BAD_TRAP !========================== SECTION .MY_DATA0 DATA_VA=0xd0100000 attr_data { Name = .MY_DATA0, VA= 0x0d0100000 RA=0xc000000000, PA=0xc000000000, 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 } .data .global addrA .align 0x4 addrA: .word 0x0 .skip 0x1000 SECTION .MY_DATA1 DATA_VA=0xd1110000 attr_data { Name = .MY_DATA1, VA= 0x0d1110000, RA=0xc200000000, PA=0xc200000000, 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 } .data .global addrB .global addrC .align 0x4 addrB: .word 0x0 .skip 0x1000 .align 0x4 addrC: .word 0x0 .global protected_area protected_area: .word 0xbeef .skip 0x1000 .word 0xbeef .end