1 /*
2 * (C) Copyright 2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24 #include <common.h>
25
26 /*
27 * CPU test
28 * Load instructions: lbz(x)(u), lhz(x)(u), lha(x)(u), lwz(x)(u)
29 *
30 * All operations are performed on a 16-byte array. The array
31 * is 4-byte aligned. The base register points to offset 8.
32 * The immediate offset (index register) ranges in [-8 ... +7].
33 * The test cases are composed so that they do not
34 * cause alignment exceptions.
35 * The test contains a pre-built table describing all test cases.
36 * The table entry contains:
37 * the instruction opcode, the array contents, the value of the index
38 * register and the expected value of the destination register.
39 * After executing the instruction, the test verifies the
40 * value of the destination register and the value of the base
41 * register (it must change for "load with update" instructions).
42 */
43
44 #include <post.h>
45 #include "cpu_asm.h"
46
47 #if CONFIG_POST & CONFIG_SYS_POST_CPU
48
49 extern void cpu_post_exec_22w (ulong *code, ulong *op1, ulong op2, ulong *op3);
50 extern void cpu_post_exec_21w (ulong *code, ulong *op1, ulong *op2);
51
52 static struct cpu_post_load_s
53 {
54 ulong cmd;
55 uint width;
56 int update;
57 int index;
58 ulong offset;
59 } cpu_post_load_table[] =
60 {
61 {
62 OP_LWZ,
63 4,
64 0,
65 0,
66 4
67 },
68 {
69 OP_LHA,
70 3,
71 0,
72 0,
73 2
74 },
75 {
76 OP_LHZ,
77 2,
78 0,
79 0,
80 2
81 },
82 {
83 OP_LBZ,
84 1,
85 0,
86 0,
87 1
88 },
89 {
90 OP_LWZU,
91 4,
92 1,
93 0,
94 4
95 },
96 {
97 OP_LHAU,
98 3,
99 1,
100 0,
101 2
102 },
103 {
104 OP_LHZU,
105 2,
106 1,
107 0,
108 2
109 },
110 {
111 OP_LBZU,
112 1,
113 1,
114 0,
115 1
116 },
117 {
118 OP_LWZX,
119 4,
120 0,
121 1,
122 4
123 },
124 {
125 OP_LHAX,
126 3,
127 0,
128 1,
129 2
130 },
131 {
132 OP_LHZX,
133 2,
134 0,
135 1,
136 2
137 },
138 {
139 OP_LBZX,
140 1,
141 0,
142 1,
143 1
144 },
145 {
146 OP_LWZUX,
147 4,
148 1,
149 1,
150 4
151 },
152 {
153 OP_LHAUX,
154 3,
155 1,
156 1,
157 2
158 },
159 {
160 OP_LHZUX,
161 2,
162 1,
163 1,
164 2
165 },
166 {
167 OP_LBZUX,
168 1,
169 1,
170 1,
171 1
172 },
173 };
174 static unsigned int cpu_post_load_size =
175 sizeof (cpu_post_load_table) / sizeof (struct cpu_post_load_s);
176
cpu_post_test_load(void)177 int cpu_post_test_load (void)
178 {
179 int ret = 0;
180 unsigned int i;
181 int flag = disable_interrupts();
182
183 for (i = 0; i < cpu_post_load_size && ret == 0; i++)
184 {
185 struct cpu_post_load_s *test = cpu_post_load_table + i;
186 uchar data[16] =
187 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
188 ulong base0 = (ulong) (data + 8);
189 ulong base = base0;
190 ulong value;
191
192 if (test->index)
193 {
194 ulong code[] =
195 {
196 ASM_12(test->cmd, 5, 3, 4),
197 ASM_BLR,
198 };
199
200 cpu_post_exec_22w (code, &base, test->offset, &value);
201 }
202 else
203 {
204 ulong code[] =
205 {
206 ASM_11I(test->cmd, 4, 3, test->offset),
207 ASM_BLR,
208 };
209
210 cpu_post_exec_21w (code, &base, &value);
211 }
212
213 if (ret == 0)
214 {
215 if (test->update)
216 ret = base == base0 + test->offset ? 0 : -1;
217 else
218 ret = base == base0 ? 0 : -1;
219 }
220
221 if (ret == 0)
222 {
223 switch (test->width)
224 {
225 case 1:
226 ret = *(uchar *)(base0 + test->offset) == value ?
227 0 : -1;
228 break;
229 case 2:
230 ret = *(ushort *)(base0 + test->offset) == value ?
231 0 : -1;
232 break;
233 case 3:
234 ret = *(short *)(base0 + test->offset) == value ?
235 0 : -1;
236 break;
237 case 4:
238 ret = *(ulong *)(base0 + test->offset) == value ?
239 0 : -1;
240 break;
241 }
242 }
243
244 if (ret != 0)
245 {
246 post_log ("Error at load test %d !\n", i);
247 }
248 }
249
250 if (flag)
251 enable_interrupts();
252
253 return ret;
254 }
255
256 #endif
257