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Commit | Line | Data |
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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> | |
9 | ||
10 | #include <asm/e820.h> | |
11 | ||
6d74171b AH |
12 | static u64 patterns[] __initdata = { |
13 | 0, | |
14 | 0xffffffffffffffffULL, | |
15 | 0x5555555555555555ULL, | |
16 | 0xaaaaaaaaaaaaaaaaULL, | |
17 | }; | |
40823f73 | 18 | |
1f067167 | 19 | static void __init memtest(unsigned long start_phys, unsigned long size, |
6d74171b | 20 | u64 pattern) |
1f067167 YL |
21 | { |
22 | unsigned long i; | |
6d74171b | 23 | u64 *start; |
1f067167 YL |
24 | unsigned long start_bad; |
25 | unsigned long last_bad; | |
1f067167 YL |
26 | unsigned long start_phys_aligned; |
27 | unsigned long count; | |
28 | unsigned long incr; | |
29 | ||
6d74171b | 30 | incr = sizeof(pattern); |
1f067167 YL |
31 | start_phys_aligned = ALIGN(start_phys, incr); |
32 | count = (size - (start_phys_aligned - start_phys))/incr; | |
33 | start = __va(start_phys_aligned); | |
34 | start_bad = 0; | |
35 | last_bad = 0; | |
36 | ||
37 | for (i = 0; i < count; i++) | |
6d74171b | 38 | start[i] = pattern; |
1f067167 | 39 | for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { |
6d74171b | 40 | if (*start != pattern) { |
1f067167 YL |
41 | if (start_phys_aligned == last_bad + incr) { |
42 | last_bad += incr; | |
43 | } else { | |
44 | if (start_bad) { | |
6d74171b AH |
45 | printk(KERN_CONT "\n %016llx bad mem addr %010lx - %010lx reserved", |
46 | (unsigned long long) pattern, | |
47 | start_bad, last_bad + incr); | |
2cb0ebee | 48 | reserve_early(start_bad, last_bad + incr, "BAD RAM"); |
1f067167 YL |
49 | } |
50 | start_bad = last_bad = start_phys_aligned; | |
51 | } | |
52 | } | |
53 | } | |
54 | if (start_bad) { | |
6d74171b AH |
55 | printk(KERN_CONT "\n %016llx bad mem addr %010lx - %010lx reserved", |
56 | (unsigned long long) pattern, start_bad, | |
57 | last_bad + incr); | |
2cb0ebee | 58 | reserve_early(start_bad, last_bad + incr, "BAD RAM"); |
1f067167 | 59 | } |
1f067167 YL |
60 | } |
61 | ||
62 | /* default is disabled */ | |
63 | static int memtest_pattern __initdata; | |
64 | ||
65 | static int __init parse_memtest(char *arg) | |
66 | { | |
67 | if (arg) | |
68 | memtest_pattern = simple_strtoul(arg, NULL, 0); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | early_param("memtest", parse_memtest); | |
73 | ||
74 | void __init early_memtest(unsigned long start, unsigned long end) | |
75 | { | |
76 | u64 t_start, t_size; | |
6d74171b AH |
77 | unsigned int i; |
78 | u64 pattern; | |
1f067167 YL |
79 | |
80 | if (!memtest_pattern) | |
81 | return; | |
82 | ||
83 | printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); | |
6d74171b AH |
84 | for (i = 0; i < memtest_pattern; i++) { |
85 | unsigned int idx = i % ARRAY_SIZE(patterns); | |
86 | pattern = patterns[idx]; | |
1f067167 YL |
87 | t_start = start; |
88 | t_size = 0; | |
89 | while (t_start < end) { | |
90 | t_start = find_e820_area_size(t_start, &t_size, 1); | |
91 | ||
92 | /* done ? */ | |
93 | if (t_start >= end) | |
94 | break; | |
95 | if (t_start + t_size > end) | |
96 | t_size = end - t_start; | |
97 | ||
98 | printk(KERN_CONT "\n %010llx - %010llx pattern %d", | |
40823f73 | 99 | (unsigned long long)t_start, |
6d74171b | 100 | (unsigned long long)t_start + t_size, idx); |
1f067167 YL |
101 | |
102 | memtest(t_start, t_size, pattern); | |
103 | ||
104 | t_start += t_size; | |
105 | } | |
106 | } | |
107 | printk(KERN_CONT "\n"); | |
108 | } |