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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 | ||
12 | static void __init memtest(unsigned long start_phys, unsigned long size, | |
13 | unsigned pattern) | |
14 | { | |
15 | unsigned long i; | |
16 | unsigned long *start; | |
17 | unsigned long start_bad; | |
18 | unsigned long last_bad; | |
19 | unsigned long val; | |
20 | unsigned long start_phys_aligned; | |
21 | unsigned long count; | |
22 | unsigned long incr; | |
23 | ||
24 | switch (pattern) { | |
25 | case 0: | |
26 | val = 0UL; | |
27 | break; | |
28 | case 1: | |
29 | val = -1UL; | |
30 | break; | |
31 | case 2: | |
32 | #ifdef CONFIG_X86_64 | |
33 | val = 0x5555555555555555UL; | |
34 | #else | |
35 | val = 0x55555555UL; | |
36 | #endif | |
37 | break; | |
38 | case 3: | |
39 | #ifdef CONFIG_X86_64 | |
40 | val = 0xaaaaaaaaaaaaaaaaUL; | |
41 | #else | |
42 | val = 0xaaaaaaaaUL; | |
43 | #endif | |
44 | break; | |
45 | default: | |
46 | return; | |
47 | } | |
48 | ||
49 | incr = sizeof(unsigned long); | |
50 | start_phys_aligned = ALIGN(start_phys, incr); | |
51 | count = (size - (start_phys_aligned - start_phys))/incr; | |
52 | start = __va(start_phys_aligned); | |
53 | start_bad = 0; | |
54 | last_bad = 0; | |
55 | ||
56 | for (i = 0; i < count; i++) | |
57 | start[i] = val; | |
58 | for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { | |
59 | if (*start != val) { | |
60 | if (start_phys_aligned == last_bad + incr) { | |
61 | last_bad += incr; | |
62 | } else { | |
63 | if (start_bad) { | |
64 | printk(KERN_CONT "\n %010lx bad mem addr %010lx - %010lx reserved", | |
65 | val, start_bad, last_bad + incr); | |
66 | reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); | |
67 | } | |
68 | start_bad = last_bad = start_phys_aligned; | |
69 | } | |
70 | } | |
71 | } | |
72 | if (start_bad) { | |
73 | printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved", | |
74 | val, start_bad, last_bad + incr); | |
75 | reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); | |
76 | } | |
77 | ||
78 | } | |
79 | ||
80 | /* default is disabled */ | |
81 | static int memtest_pattern __initdata; | |
82 | ||
83 | static int __init parse_memtest(char *arg) | |
84 | { | |
85 | if (arg) | |
86 | memtest_pattern = simple_strtoul(arg, NULL, 0); | |
87 | return 0; | |
88 | } | |
89 | ||
90 | early_param("memtest", parse_memtest); | |
91 | ||
92 | void __init early_memtest(unsigned long start, unsigned long end) | |
93 | { | |
94 | u64 t_start, t_size; | |
95 | unsigned pattern; | |
96 | ||
97 | if (!memtest_pattern) | |
98 | return; | |
99 | ||
100 | printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); | |
101 | for (pattern = 0; pattern < memtest_pattern; pattern++) { | |
102 | t_start = start; | |
103 | t_size = 0; | |
104 | while (t_start < end) { | |
105 | t_start = find_e820_area_size(t_start, &t_size, 1); | |
106 | ||
107 | /* done ? */ | |
108 | if (t_start >= end) | |
109 | break; | |
110 | if (t_start + t_size > end) | |
111 | t_size = end - t_start; | |
112 | ||
113 | printk(KERN_CONT "\n %010llx - %010llx pattern %d", | |
114 | (unsigned long long)t_start, | |
115 | (unsigned long long)t_start + t_size, pattern); | |
116 | ||
117 | memtest(t_start, t_size, pattern); | |
118 | ||
119 | t_start += t_size; | |
120 | } | |
121 | } | |
122 | printk(KERN_CONT "\n"); | |
123 | } |