| 1 | /* |
| 2 | * ========== Copyright Header Begin ========================================== |
| 3 | * |
| 4 | * OpenSPARC T2 Processor File: tso_n1_mutex4_casx.s |
| 5 | * Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved |
| 6 | * 4150 Network Circle, Santa Clara, California 95054, U.S.A. |
| 7 | * |
| 8 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; version 2 of the License. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | * |
| 23 | * For the avoidance of doubt, and except that if any non-GPL license |
| 24 | * choice is available it will apply instead, Sun elects to use only |
| 25 | * the General Public License version 2 (GPLv2) at this time for any |
| 26 | * software where a choice of GPL license versions is made |
| 27 | * available with the language indicating that GPLv2 or any later version |
| 28 | * may be used, or where a choice of which version of the GPL is applied is |
| 29 | * otherwise unspecified. |
| 30 | * |
| 31 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 32 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 33 | * have any questions. |
| 34 | * |
| 35 | * |
| 36 | * ========== Copyright Header End ============================================ |
| 37 | */ |
| 38 | #define spinlock_addr_reg %o0 |
| 39 | #define data_base_reg %o1 |
| 40 | #define to_reg %o2 |
| 41 | #define my_id_reg %o3 |
| 42 | #define test_reg %o4 |
| 43 | #define global_cnt_reg %o5 |
| 44 | |
| 45 | #define TIMEOUT 0x1000 |
| 46 | #define ITERATIONS 0x4 |
| 47 | |
| 48 | #if defined CREGS_LSU_CTL_REG_DC && CREGS_LSU_CTL_REG_DC == 0 |
| 49 | #define TIMEOUT 0x2000 |
| 50 | #define ITERATIONS 0x1 |
| 51 | #endif |
| 52 | |
| 53 | #if defined CREGS_LSU_CTL_REG_IC && CREGS_LSU_CTL_REG_IC == 0 |
| 54 | #define TIMEOUT 0x2000 |
| 55 | #define ITERATIONS 0x1 |
| 56 | #endif |
| 57 | |
| 58 | #if defined CREGS_L2_CTL_REG_DIS && CREGS_L2_CTL_REG_DIS == 1 |
| 59 | #define TIMEOUT 0x2000 |
| 60 | #define ITERATIONS 0x1 |
| 61 | #endif |
| 62 | |
| 63 | #include "hboot.s" |
| 64 | |
| 65 | .global main |
| 66 | |
| 67 | main: |
| 68 | |
| 69 | wr %g0, 0x4, %fprs ! make sure fef is 1 |
| 70 | setx spinlock_address, %l0, spinlock_addr_reg ! spinlock address |
| 71 | set TIMEOUT, to_reg ! set timeout count |
| 72 | set ITERATIONS, global_cnt_reg |
| 73 | |
| 74 | or spinlock_addr_reg, %g0, my_id_reg |
| 75 | |
| 76 | th_fork(th_main,%l0) |
| 77 | |
| 78 | th_main_0: |
| 79 | add my_id_reg, 0x20, my_id_reg ! my ID address |
| 80 | stb my_id_reg, [my_id_reg] ! store my ID there |
| 81 | ba getlock |
| 82 | nop |
| 83 | |
| 84 | th_main_1: |
| 85 | add my_id_reg, 0x24, my_id_reg |
| 86 | stb my_id_reg, [my_id_reg] |
| 87 | ba getlock |
| 88 | nop |
| 89 | |
| 90 | |
| 91 | th_main_2: |
| 92 | add my_id_reg, 0x28, my_id_reg |
| 93 | stb my_id_reg, [my_id_reg] |
| 94 | ba getlock |
| 95 | nop |
| 96 | |
| 97 | th_main_3: |
| 98 | add my_id_reg, 0x2c, my_id_reg |
| 99 | stb my_id_reg, [my_id_reg] |
| 100 | ba getlock |
| 101 | nop |
| 102 | |
| 103 | th_main_4: |
| 104 | add my_id_reg, 0x30, my_id_reg |
| 105 | stb my_id_reg, [my_id_reg] |
| 106 | ba getlock |
| 107 | nop |
| 108 | |
| 109 | th_main_5: |
| 110 | add my_id_reg, 0x34, my_id_reg |
| 111 | stb my_id_reg, [my_id_reg] |
| 112 | ba getlock |
| 113 | nop |
| 114 | |
| 115 | th_main_6: |
| 116 | add my_id_reg, 0x38, my_id_reg |
| 117 | stb my_id_reg, [my_id_reg] |
| 118 | ba getlock |
| 119 | nop |
| 120 | |
| 121 | th_main_7: |
| 122 | add my_id_reg, 0x3c, my_id_reg |
| 123 | stb my_id_reg, [my_id_reg] |
| 124 | ba getlock |
| 125 | nop |
| 126 | |
| 127 | getlock: |
| 128 | deccc to_reg ! dec timeout count |
| 129 | be bad_end ! branch if no timeout |
| 130 | nop |
| 131 | or %g0, my_id_reg, test_reg |
| 132 | casx [spinlock_addr_reg], %g0, test_reg ! try to acquire lock |
| 133 | tst test_reg ! did we get it? |
| 134 | bne getlock |
| 135 | nop |
| 136 | |
| 137 | gotlock: ! do something |
| 138 | set TIMEOUT, to_reg ! set to count again |
| 139 | setx protected_area, %l0, data_base_reg ! the data area |
| 140 | |
| 141 | set 10, %l0 |
| 142 | loop1: |
| 143 | ld [my_id_reg], %f16 ! read the ID |
| 144 | st %f16, [data_base_reg] ! store my ID in there |
| 145 | add data_base_reg, 8, data_base_reg ! increment the address |
| 146 | deccc %l0 |
| 147 | bne loop1 ! repeat |
| 148 | nop |
| 149 | |
| 150 | set 10, %l0 |
| 151 | loop2: |
| 152 | sub data_base_reg, 8, data_base_reg |
| 153 | ld [my_id_reg], %f16 ! read the ID |
| 154 | ld [data_base_reg], %f0 ! read the data area |
| 155 | fcmps %fcc0, %f0, %f16 ! should be my ID |
| 156 | fbne %fcc0, bad_end |
| 157 | nop |
| 158 | deccc %l0 ! repeat |
| 159 | bne loop2 |
| 160 | nop |
| 161 | |
| 162 | clearlock: |
| 163 | stx %g0, [spinlock_addr_reg] ! unlock |
| 164 | |
| 165 | check_done: ! finish or iterate |
| 166 | deccc global_cnt_reg |
| 167 | be good_end |
| 168 | nop |
| 169 | ba getlock |
| 170 | nop |
| 171 | |
| 172 | good_end: |
| 173 | ta T_GOOD_TRAP |
| 174 | bad_end: |
| 175 | ta T_BAD_TRAP |
| 176 | |
| 177 | !========================== |
| 178 | .data |
| 179 | |
| 180 | user_data_start: |
| 181 | |
| 182 | spinlock_address: |
| 183 | .word 0x0 |
| 184 | .skip 0x1000 |
| 185 | protected_area: |
| 186 | .word 0xbeef |
| 187 | .skip 0x1000 |
| 188 | .word 0xbeef |
| 189 | |
| 190 | |
| 191 | |