Commit | Line | Data |
---|---|---|
1f067167 YL |
1 | #include <linux/kernel.h> |
2 | #include <linux/errno.h> | |
3 | #include <linux/string.h> | |
4 | #include <linux/types.h> | |
5 | #include <linux/mm.h> | |
6 | #include <linux/smp.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/pfn.h> | |
a9ce6bc1 | 9 | #include <linux/memblock.h> |
1f067167 | 10 | |
6d74171b AH |
11 | static u64 patterns[] __initdata = { |
12 | 0, | |
13 | 0xffffffffffffffffULL, | |
14 | 0x5555555555555555ULL, | |
15 | 0xaaaaaaaaaaaaaaaaULL, | |
63823126 AH |
16 | 0x1111111111111111ULL, |
17 | 0x2222222222222222ULL, | |
18 | 0x4444444444444444ULL, | |
19 | 0x8888888888888888ULL, | |
20 | 0x3333333333333333ULL, | |
21 | 0x6666666666666666ULL, | |
22 | 0x9999999999999999ULL, | |
23 | 0xccccccccccccccccULL, | |
24 | 0x7777777777777777ULL, | |
25 | 0xbbbbbbbbbbbbbbbbULL, | |
26 | 0xddddddddddddddddULL, | |
27 | 0xeeeeeeeeeeeeeeeeULL, | |
28 | 0x7a6c7258554e494cULL, /* yeah ;-) */ | |
6d74171b | 29 | }; |
40823f73 | 30 | |
570c9e69 | 31 | static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad) |
7dad169e | 32 | { |
570c9e69 AH |
33 | printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n", |
34 | (unsigned long long) pattern, | |
35 | (unsigned long long) start_bad, | |
36 | (unsigned long long) end_bad); | |
a9ce6bc1 | 37 | memblock_x86_reserve_range(start_bad, end_bad, "BAD RAM"); |
7dad169e AH |
38 | } |
39 | ||
570c9e69 | 40 | static void __init memtest(u64 pattern, u64 start_phys, u64 size) |
1f067167 | 41 | { |
9866b7e8 | 42 | u64 *p, *start, *end; |
570c9e69 AH |
43 | u64 start_bad, last_bad; |
44 | u64 start_phys_aligned; | |
9866b7e8 | 45 | const size_t incr = sizeof(pattern); |
1f067167 | 46 | |
1f067167 | 47 | start_phys_aligned = ALIGN(start_phys, incr); |
1f067167 | 48 | start = __va(start_phys_aligned); |
9866b7e8 | 49 | end = start + (size - (start_phys_aligned - start_phys)) / incr; |
1f067167 YL |
50 | start_bad = 0; |
51 | last_bad = 0; | |
52 | ||
c9690998 AH |
53 | for (p = start; p < end; p++) |
54 | *p = pattern; | |
9866b7e8 | 55 | |
c9690998 AH |
56 | for (p = start; p < end; p++, start_phys_aligned += incr) { |
57 | if (*p == pattern) | |
7dad169e AH |
58 | continue; |
59 | if (start_phys_aligned == last_bad + incr) { | |
60 | last_bad += incr; | |
61 | continue; | |
1f067167 | 62 | } |
7dad169e AH |
63 | if (start_bad) |
64 | reserve_bad_mem(pattern, start_bad, last_bad + incr); | |
65 | start_bad = last_bad = start_phys_aligned; | |
1f067167 | 66 | } |
7dad169e AH |
67 | if (start_bad) |
68 | reserve_bad_mem(pattern, start_bad, last_bad + incr); | |
1f067167 YL |
69 | } |
70 | ||
bfb4dc0d AH |
71 | static void __init do_one_pass(u64 pattern, u64 start, u64 end) |
72 | { | |
73 | u64 size = 0; | |
74 | ||
75 | while (start < end) { | |
a9ce6bc1 | 76 | start = memblock_x86_find_in_range_size(start, &size, 1); |
bfb4dc0d AH |
77 | |
78 | /* done ? */ | |
79 | if (start >= end) | |
80 | break; | |
81 | if (start + size > end) | |
82 | size = end - start; | |
83 | ||
84 | printk(KERN_INFO " %010llx - %010llx pattern %016llx\n", | |
85 | (unsigned long long) start, | |
86 | (unsigned long long) start + size, | |
87 | (unsigned long long) cpu_to_be64(pattern)); | |
88 | memtest(pattern, start, size); | |
89 | ||
90 | start += size; | |
91 | } | |
92 | } | |
93 | ||
1f067167 YL |
94 | /* default is disabled */ |
95 | static int memtest_pattern __initdata; | |
96 | ||
97 | static int __init parse_memtest(char *arg) | |
98 | { | |
99 | if (arg) | |
100 | memtest_pattern = simple_strtoul(arg, NULL, 0); | |
d1a8e779 YL |
101 | else |
102 | memtest_pattern = ARRAY_SIZE(patterns); | |
103 | ||
1f067167 YL |
104 | return 0; |
105 | } | |
106 | ||
107 | early_param("memtest", parse_memtest); | |
108 | ||
109 | void __init early_memtest(unsigned long start, unsigned long end) | |
110 | { | |
6d74171b | 111 | unsigned int i; |
bfb4dc0d | 112 | unsigned int idx = 0; |
1f067167 YL |
113 | |
114 | if (!memtest_pattern) | |
115 | return; | |
116 | ||
570c9e69 | 117 | printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern); |
6d74171b | 118 | for (i = 0; i < memtest_pattern; i++) { |
bfb4dc0d AH |
119 | idx = i % ARRAY_SIZE(patterns); |
120 | do_one_pass(patterns[idx], start, end); | |
121 | } | |
122 | ||
123 | if (idx > 0) { | |
124 | printk(KERN_INFO "early_memtest: wipe out " | |
125 | "test pattern from memory\n"); | |
126 | /* additional test with pattern 0 will do this */ | |
127 | do_one_pass(0, start, end); | |
1f067167 | 128 | } |
1f067167 | 129 | } |