projects / OpenSPARC-T2-DV / blame
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| 86530b38 AT |
1 | /* |
| 2 | * ========== Copyright Header Begin ========================================== | |
| 3 | * | |
| 4 | * OpenSPARC T2 Processor File: tso_n1_mutex3_cas.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 0x2 | |
| 47 | ||
| 48 | ||
| 49 | #include "hboot.s" | |
| 50 | ||
| 51 | .global main | |
| 52 | ||
| 53 | main: | |
| 54 | ||
| 55 | setx spinlock_address, %l0, spinlock_addr_reg ! spinlock address | |
| 56 | set TIMEOUT, to_reg ! set timeout count | |
| 57 | set ITERATIONS, global_cnt_reg | |
| 58 | ||
| 59 | or spinlock_addr_reg, %g0, my_id_reg | |
| 60 | ||
| 61 | th_fork(th_main,%l0) | |
| 62 | ||
| 63 | th_main_0: | |
| 64 | add my_id_reg, 0x20, my_id_reg ! my ID address | |
| 65 | stb %g0, [my_id_reg] ! clear it | |
| 66 | ba getlock | |
| 67 | nop | |
| 68 | ||
| 69 | th_main_1: | |
| 70 | add my_id_reg, 0x24, my_id_reg | |
| 71 | stb %g0, [my_id_reg] | |
| 72 | ba getlock | |
| 73 | nop | |
| 74 | ||
| 75 | ||
| 76 | th_main_2: | |
| 77 | add my_id_reg, 0x28, my_id_reg | |
| 78 | stb %g0, [my_id_reg] | |
| 79 | ba getlock | |
| 80 | nop | |
| 81 | ||
| 82 | th_main_3: | |
| 83 | add my_id_reg, 0x2c, my_id_reg | |
| 84 | stb %g0, [my_id_reg] | |
| 85 | ba getlock | |
| 86 | nop | |
| 87 | ||
| 88 | th_main_4: | |
| 89 | add my_id_reg, 0x30, my_id_reg | |
| 90 | stb %g0, [my_id_reg] | |
| 91 | ba getlock | |
| 92 | nop | |
| 93 | ||
| 94 | th_main_5: | |
| 95 | add my_id_reg, 0x34, my_id_reg | |
| 96 | stb %g0, [my_id_reg] | |
| 97 | ba getlock | |
| 98 | nop | |
| 99 | ||
| 100 | th_main_6: | |
| 101 | add my_id_reg, 0x38, my_id_reg | |
| 102 | stb %g0, [my_id_reg] | |
| 103 | ba getlock | |
| 104 | nop | |
| 105 | ||
| 106 | th_main_7: | |
| 107 | add my_id_reg, 0x3c, my_id_reg | |
| 108 | stb %g0, [my_id_reg] | |
| 109 | ba getlock | |
| 110 | nop | |
| 111 | ||
| 112 | getlock: | |
| 113 | deccc to_reg ! dec timeout count | |
| 114 | be bad_end ! branch if no timeout | |
| 115 | nop | |
| 116 | or %g0, my_id_reg, test_reg ! | |
| 117 | cas [spinlock_addr_reg], %g0, test_reg ! try to acquire lock | |
| 118 | tst test_reg ! did we get it? | |
| 119 | bne getlock | |
| 120 | nop | |
| 121 | ||
| 122 | gotlock: ! do something | |
| 123 | set TIMEOUT, to_reg ! set to count again | |
| 124 | setx protected_area, %l0, data_base_reg | |
| 125 | ||
| 126 | set 100, %l0 | |
| 127 | loop1: | |
| 128 | st my_id_reg, [data_base_reg] ! store my ID in there | |
| 129 | add data_base_reg, 8, data_base_reg ! increment the address | |
| 130 | deccc %l0 | |
| 131 | bne loop1 ! repeat | |
| 132 | nop | |
| 133 | ||
| 134 | set 100, %l0 | |
| 135 | loop2: | |
| 136 | sub data_base_reg, 8, data_base_reg | |
| 137 | ld [data_base_reg], %l1 ! read the data area | |
| 138 | subcc %l1, my_id_reg, %l1 ! should be my ID | |
| 139 | bne bad_end | |
| 140 | nop | |
| 141 | deccc %l0 ! repeat | |
| 142 | bne loop2 | |
| 143 | nop | |
| 144 | ||
| 145 | clearlock: | |
| 146 | st %g0, [spinlock_addr_reg] ! unlock | |
| 147 | ||
| 148 | check_done: ! finish or iterate | |
| 149 | deccc global_cnt_reg | |
| 150 | be good_end | |
| 151 | nop | |
| 152 | ba getlock | |
| 153 | nop | |
| 154 | ||
| 155 | good_end: | |
| 156 | ta T_GOOD_TRAP | |
| 157 | bad_end: | |
| 158 | ta T_BAD_TRAP | |
| 159 | ||
| 160 | !========================== | |
| 161 | .data | |
| 162 | ||
| 163 | .align 0x40 | |
| 164 | user_data_start: | |
| 165 | spinlock_address: | |
| 166 | .word 0x0 | |
| 167 | .skip 0x1000 | |
| 168 | protected_area: | |
| 169 | .word 0xbeef | |
| 170 | .skip 0x1000 | |
| 171 | .word 0xbeef | |
| 172 | ||
| 173 | ! do some post-processing | |
| 174 | ||
| 175 |