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1 | /* |
2 | * ========== Copyright Header Begin ========================================== | |
3 | * | |
4 | * OpenSPARC T2 Processor File: tso_n1_dekker11.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 global_cnt_reg %o0 | |
39 | #define data_base_reg %o1 | |
40 | #define addrA_reg %o2 | |
41 | #define addrB_reg %o3 | |
42 | #define to_reg %o4 | |
43 | #define my_id_reg %o5 | |
44 | #define test_reg %o6 | |
45 | ||
46 | #define backoff_cnt %i4 | |
47 | #define backoff_hlp1 %i5 | |
48 | ||
49 | #define TIMEOUT 0x100 | |
50 | #define ITERATIONS 0x10 | |
51 | ||
52 | #include "hboot.s" | |
53 | ||
54 | .global main | |
55 | main: | |
56 | ||
57 | setx addrA, %l0, addrA_reg | |
58 | setx addrB, %l0, addrB_reg | |
59 | set TIMEOUT, to_reg ! set timeout count | |
60 | inc to_reg | |
61 | mov to_reg, backoff_hlp1 | |
62 | dec to_reg | |
63 | set ITERATIONS, global_cnt_reg | |
64 | mov %g0, my_id_reg | |
65 | ||
66 | ||
67 | th_fork(th_main,%l0) | |
68 | ||
69 | th_main_0: | |
70 | add my_id_reg, 0x20, my_id_reg ! ID address | |
71 | ||
72 | getlock0: | |
73 | set 1, test_reg ! load the swap data register | |
74 | st test_reg, [addrA_reg] ! try to acquire lock | |
75 | cas [addrA_reg], %g0, test_reg ! try to acquire lock | |
76 | ld [addrB_reg], test_reg ! try to acquire lock | |
77 | tst test_reg | |
78 | be gotlock0 | |
79 | nop | |
80 | ||
81 | st %g0, [addrA_reg] ! release | |
82 | membar 0x40 | |
83 | ||
84 | deccc to_reg ! dec timeout count | |
85 | bne getlock0 ! branch if no timeout | |
86 | nop | |
87 | ba,a bad_end | |
88 | nop | |
89 | ||
90 | gotlock0: ! do something | |
91 | setx protected_area, %l0, data_base_reg | |
92 | ||
93 | set 10, %l0 | |
94 | add my_id_reg, data_base_reg, %i1 | |
95 | loop01: | |
96 | st %i1, [data_base_reg] ! store my ID in there | |
97 | add data_base_reg, 4, data_base_reg ! increment the address | |
98 | add %i1, 1, %i1 | |
99 | deccc %l0 | |
100 | bne loop01 ! repeat | |
101 | nop | |
102 | ||
103 | set 10, %l0 | |
104 | loop02: | |
105 | sub data_base_reg, 4, data_base_reg | |
106 | sub %i1, 1, %i1 | |
107 | ld [data_base_reg], %l1 ! read the data area | |
108 | subcc %l1, %i1, %l1 ! should be same is i1 | |
109 | bne bad_end | |
110 | nop | |
111 | deccc %l0 ! repeat | |
112 | bne loop02 | |
113 | nop | |
114 | ||
115 | clearlock0: | |
116 | st %g0, [addrA_reg] ! unlock | |
117 | membar 0x40 | |
118 | ||
119 | mov to_reg, backoff_cnt | |
120 | backoff_loop01: | |
121 | nop;nop;nop;nop; ! backoff | |
122 | deccc backoff_cnt | |
123 | bne backoff_loop01 | |
124 | nop | |
125 | ||
126 | set TIMEOUT, to_reg ! set timeout count again | |
127 | ||
128 | check_done0: | |
129 | deccc global_cnt_reg | |
130 | be good_end | |
131 | nop | |
132 | ba getlock0 | |
133 | nop | |
134 | ||
135 | th_main_1: | |
136 | th_main_4: | |
137 | add my_id_reg, 0x24, my_id_reg | |
138 | ||
139 | getlock1: | |
140 | set 1, test_reg ! load the swap data register | |
141 | st test_reg, [addrB_reg] ! try to acquire lock | |
142 | membar 0x40 | |
143 | ld [addrA_reg], test_reg ! try to acquire lock | |
144 | tst test_reg | |
145 | be gotlock1 | |
146 | nop | |
147 | ||
148 | st %g0, [addrB_reg] ! release | |
149 | membar 0x40 | |
150 | ||
151 | sub backoff_hlp1, to_reg, backoff_cnt | |
152 | backoff_loop10: | |
153 | nop;nop;nop;nop; ! quasi exponential backoff | |
154 | deccc backoff_cnt ! well, kinda linear. | |
155 | bne backoff_loop10 | |
156 | nop | |
157 | ||
158 | deccc to_reg ! dec timeout count | |
159 | bne getlock1 ! branch if no timeout | |
160 | nop | |
161 | ba,a bad_end | |
162 | nop | |
163 | ||
164 | gotlock1: ! do something | |
165 | setx protected_area, %l0, data_base_reg | |
166 | ||
167 | set 10, %l0 | |
168 | add my_id_reg, data_base_reg, %i1 | |
169 | loop11: | |
170 | st %i1, [data_base_reg] ! store my ID in there | |
171 | add data_base_reg, 4, data_base_reg ! increment the address | |
172 | add %i1, 1, %i1 | |
173 | deccc %l0 | |
174 | bne loop11 ! repeat | |
175 | nop | |
176 | ||
177 | set 10, %l0 | |
178 | loop12: | |
179 | sub data_base_reg, 4, data_base_reg | |
180 | sub %i1, 1, %i1 | |
181 | ld [data_base_reg], %l1 ! read the data area | |
182 | subcc %l1, %i1, %l1 ! should be same is i1 | |
183 | bne bad_end | |
184 | nop | |
185 | deccc %l0 ! repeat | |
186 | bne loop12 | |
187 | nop | |
188 | ||
189 | ||
190 | clearlock1: | |
191 | st %g0, [addrB_reg] ! unlock | |
192 | membar 0x40 | |
193 | ||
194 | set TIMEOUT, to_reg ! set timeout count again | |
195 | ||
196 | check_done1: | |
197 | deccc global_cnt_reg | |
198 | be good_end | |
199 | nop | |
200 | ba getlock1 | |
201 | nop | |
202 | ||
203 | good_end: | |
204 | ta T_GOOD_TRAP | |
205 | bad_end: | |
206 | ta T_BAD_TRAP | |
207 | ||
208 | !========================== | |
209 | ||
210 | ||
211 | SECTION .MY_DATA0 TEXT_VA=0xf0100000, DATA_VA=0xd0100000 | |
212 | attr_data { | |
213 | Name = .MY_DATA0, | |
214 | VA= 0x0d0100000 | |
215 | RA= 0x1d0100000 | |
216 | PA= ra2pa(0x1d0100000,0), | |
217 | part_0_ctx_nonzero_tsb_config_0, | |
218 | TTE_G=1, TTE_Context=0x44, TTE_V=1, TTE_Size=0, TTE_NFO=0, | |
219 | TTE_IE=0, TTE_Soft2=0, TTE_Diag=0, TTE_Soft=0, | |
220 | TTE_L=0, TTE_CP=1, TTE_CV=1, TTE_E=0, TTE_P=0, TTE_W=1 | |
221 | } | |
222 | ||
223 | attr_text { | |
224 | Name = .MY_DATA0, | |
225 | VA= 0x0f0100000 | |
226 | RA= 0x1f0100000 | |
227 | PA= ra2pa(0x1f0100000,0), | |
228 | part_0_ctx_nonzero_tsb_config_0, | |
229 | TTE_G=1, TTE_Context=0x44, TTE_V=1, TTE_Size=0, TTE_NFO=0, | |
230 | TTE_IE=0, TTE_Soft2=0, TTE_Diag=0, TTE_Soft=0, | |
231 | TTE_L=0, TTE_CP=1, TTE_CV=1, TTE_E=0, TTE_P=0, TTE_W=1 | |
232 | } | |
233 | ||
234 | .data | |
235 | ||
236 | .global addrA | |
237 | .global addrB | |
238 | .align 0x4 | |
239 | addrA: | |
240 | .word 0x0 | |
241 | ||
242 | .skip 0x1000 | |
243 | .align 0x4 | |
244 | addrB: | |
245 | .word 0x0 | |
246 | ||
247 | SECTION .MY_DATA1 TEXT_VA=0xf1110000, DATA_VA=0xd1110000 | |
248 | attr_data { | |
249 | Name = .MY_DATA1, | |
250 | VA= 0x0d1110000, | |
251 | RA= 0x1d1110000, | |
252 | PA= ra2pa(0x1d1110000,0), | |
253 | part_0_ctx_nonzero_tsb_config_0, | |
254 | TTE_G=1, TTE_Context=0x44, TTE_V=1, TTE_Size=0, TTE_NFO=0, | |
255 | TTE_IE=0, TTE_Soft2=0, TTE_Diag=0, TTE_Soft=0, | |
256 | TTE_L=0, TTE_CP=1, TTE_CV=1, TTE_E=0, TTE_P=0, TTE_W=1 | |
257 | } | |
258 | ||
259 | attr_text { | |
260 | Name = .MY_DATA1, | |
261 | VA= 0x0f1110000, | |
262 | RA= 0x1f1110000, | |
263 | PA= ra2pa(0x1f1110000,0), | |
264 | part_0_ctx_nonzero_tsb_config_0, | |
265 | TTE_G=1, TTE_Context=0x44, TTE_V=1, TTE_Size=0, TTE_NFO=0, | |
266 | TTE_IE=0, TTE_Soft2=0, TTE_Diag=0, TTE_Soft=0, | |
267 | TTE_L=0, TTE_CP=1, TTE_CV=1, TTE_E=0, TTE_P=0, TTE_W=1 | |
268 | } | |
269 | ||
270 | .data | |
271 | .global protected_area | |
272 | protected_area: | |
273 | .word 0xbeef | |
274 | .skip 0x1000 | |
275 | .word 0xbeef | |
276 | ||
277 | .end |