1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
#include <stdint.h>
#include <lib.h> /* Prototypes */
#include <console/console.h>
static void write_phys(unsigned long addr, u32 value)
{
// Assembler in lib/ is very ugly. But we properly guarded
// it so let's obey this one for now
#if IS_ENABLED(CONFIG_SSE2)
asm volatile(
"movnti %1, (%0)"
: /* outputs */
: "r" (addr), "r" (value) /* inputs */
#ifndef __GNUC__ /* GCC does not like empty clobbers? */
: /* clobbers */
#endif
);
#else
volatile unsigned long *ptr;
ptr = (void *)addr;
*ptr = value;
#endif
}
static u32 read_phys(unsigned long addr)
{
volatile unsigned long *ptr;
ptr = (void *)addr;
return *ptr;
}
static void phys_memory_barrier(void)
{
#if IS_ENABLED(CONFIG_SSE2)
// Needed for movnti
asm volatile (
"sfence"
::
#ifdef __GNUC__ /* ROMCC does not like memory clobbers */
: "memory"
#endif
);
#else
#ifdef __GNUC__ /* ROMCC does not like empty asm statements */
asm volatile ("" ::: "memory");
#endif
#endif
}
/**
* Rotate ones test pattern that access every bit on a 128bit wide
* memory bus. To test most address lines, addresses are scattered
* using 256B, 4kB and 64kB increments.
*
* @param idx Index to test pattern (0=<idx<0x400)
* @param addr Memory to access on idx
* @param value Value to write or read at addr
*/
static inline void test_pattern(unsigned short int idx,
unsigned long *addr, unsigned long *value)
{
uint8_t j, k;
k = (idx >> 8) + 1;
j = (idx >> 4) & 0x0f;
*addr = idx & 0x0f;
*addr |= j << (4*k);
*value = 0x01010101 << (j & 7);
if (j & 8)
*value = ~(*value);
}
/**
* Simple write-read-verify memory test. See console debug output for
* any dislocated bytes.
*
* @param start System memory offset, aligned to 128bytes
*/
static int ram_bitset_nodie(unsigned long start)
{
unsigned long addr, value, value2;
unsigned short int idx;
unsigned char failed, failures;
uint8_t verbose = 0;
printk(BIOS_DEBUG, "DRAM bitset write: 0x%08lx\n", start);
for (idx = 0; idx < 0x400; idx += 4) {
test_pattern(idx, &addr, &value);
write_phys(start + addr, value);
}
/* Make sure we don't read before we wrote */
phys_memory_barrier();
printk(BIOS_DEBUG, "DRAM bitset verify: 0x%08lx\n", start);
failures = 0;
for (idx = 0; idx < 0x400; idx += 4) {
test_pattern(idx, &addr, &value);
value2 = read_phys(start + addr);
failed = (value2 != value);
failures |= failed;
if (failed && !verbose) {
printk(BIOS_ERR, "0x%08lx wr: 0x%08lx rd: 0x%08lx FAIL\n",
start + addr, value, value2);
}
if (verbose) {
if ((addr & 0x0f) == 0)
printk(BIOS_DEBUG, "%08lx wr: %08lx rd:",
start + addr, value);
if (failed)
printk(BIOS_DEBUG, " %08lx!", value2);
else
printk(BIOS_DEBUG, " %08lx ", value2);
if ((addr & 0x0f) == 0xc)
printk(BIOS_DEBUG, "\n");
}
}
if (failures) {
post_code(0xea);
printk(BIOS_DEBUG, "\nDRAM did _NOT_ verify!\n");
return 1;
}
printk(BIOS_DEBUG, "\nDRAM range verified.\n");
return 0;
}
void ram_check(unsigned long start, unsigned long stop)
{
/*
* This is much more of a "Is my DRAM properly configured?"
* test than a "Is my DRAM faulty?" test. Not all bits
* are tested. -Tyson
*/
printk(BIOS_DEBUG, "Testing DRAM at: %08lx\n", start);
if (ram_bitset_nodie(start))
die("DRAM ERROR");
printk(BIOS_DEBUG, "Done.\n");
}
int ram_check_nodie(unsigned long start, unsigned long stop)
{
int ret;
/*
* This is much more of a "Is my DRAM properly configured?"
* test than a "Is my DRAM faulty?" test. Not all bits
* are tested. -Tyson
*/
printk(BIOS_DEBUG, "Testing DRAM at : %08lx\n", start);
ret = ram_bitset_nodie(start);
printk(BIOS_DEBUG, "Done.\n");
return ret;
}
int ram_check_noprint_nodie(unsigned long start, unsigned long stop)
{
unsigned long addr, value, value2;
unsigned short int idx;
unsigned char failed, failures;
for (idx = 0; idx < 0x400; idx += 4) {
test_pattern(idx, &addr, &value);
write_phys(start + addr, value);
}
/* Make sure we don't read before we wrote */
phys_memory_barrier();
failures = 0;
for (idx = 0; idx < 0x400; idx += 4) {
test_pattern(idx, &addr, &value);
value2 = read_phys(start + addr);
failed = (value2 != value);
failures |= failed;
}
return failures;
}
static void __quick_ram_check(uintptr_t dst)
{
int fail = 0;
u32 backup;
backup = read_phys(dst);
write_phys(dst, 0x55555555);
phys_memory_barrier();
if (read_phys(dst) != 0x55555555)
fail = 1;
write_phys(dst, 0xaaaaaaaa);
phys_memory_barrier();
if (read_phys(dst) != 0xaaaaaaaa)
fail = 1;
write_phys(dst, 0x00000000);
phys_memory_barrier();
if (read_phys(dst) != 0x00000000)
fail = 1;
write_phys(dst, 0xffffffff);
phys_memory_barrier();
if (read_phys(dst) != 0xffffffff)
fail = 1;
write_phys(dst, backup);
if (fail) {
post_code(0xea);
die("RAM INIT FAILURE!\n");
}
phys_memory_barrier();
}
void quick_ram_check(void)
{
__quick_ram_check(0x100000);
}
|
