aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/mm/memtest.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/mm/memtest.c')
-rw-r--r--arch/x86/mm/memtest.c159
1 files changed, 84 insertions, 75 deletions
diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index 9cab18b0b857..605c8be06217 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -9,44 +9,44 @@
9 9
10#include <asm/e820.h> 10#include <asm/e820.h>
11 11
12static void __init memtest(unsigned long start_phys, unsigned long size, 12static u64 patterns[] __initdata = {
13 unsigned pattern) 13 0,
14 0xffffffffffffffffULL,
15 0x5555555555555555ULL,
16 0xaaaaaaaaaaaaaaaaULL,
17 0x1111111111111111ULL,
18 0x2222222222222222ULL,
19 0x4444444444444444ULL,
20 0x8888888888888888ULL,
21 0x3333333333333333ULL,
22 0x6666666666666666ULL,
23 0x9999999999999999ULL,
24 0xccccccccccccccccULL,
25 0x7777777777777777ULL,
26 0xbbbbbbbbbbbbbbbbULL,
27 0xddddddddddddddddULL,
28 0xeeeeeeeeeeeeeeeeULL,
29 0x7a6c7258554e494cULL, /* yeah ;-) */
30};
31
32static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
14{ 33{
15 unsigned long i; 34 printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n",
16 unsigned long *start; 35 (unsigned long long) pattern,
17 unsigned long start_bad; 36 (unsigned long long) start_bad,
18 unsigned long last_bad; 37 (unsigned long long) end_bad);
19 unsigned long val; 38 reserve_early(start_bad, end_bad, "BAD RAM");
20 unsigned long start_phys_aligned; 39}
21 unsigned long count; 40
22 unsigned long incr; 41static void __init memtest(u64 pattern, u64 start_phys, u64 size)
23 42{
24 switch (pattern) { 43 u64 i, count;
25 case 0: 44 u64 *start;
26 val = 0UL; 45 u64 start_bad, last_bad;
27 break; 46 u64 start_phys_aligned;
28 case 1: 47 size_t incr;
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 48
49 incr = sizeof(unsigned long); 49 incr = sizeof(pattern);
50 start_phys_aligned = ALIGN(start_phys, incr); 50 start_phys_aligned = ALIGN(start_phys, incr);
51 count = (size - (start_phys_aligned - start_phys))/incr; 51 count = (size - (start_phys_aligned - start_phys))/incr;
52 start = __va(start_phys_aligned); 52 start = __va(start_phys_aligned);
@@ -54,25 +54,42 @@ static void __init memtest(unsigned long start_phys, unsigned long size,
54 last_bad = 0; 54 last_bad = 0;
55 55
56 for (i = 0; i < count; i++) 56 for (i = 0; i < count; i++)
57 start[i] = val; 57 start[i] = pattern;
58 for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { 58 for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
59 if (*start != val) { 59 if (*start == pattern)
60 if (start_phys_aligned == last_bad + incr) { 60 continue;
61 last_bad += incr; 61 if (start_phys_aligned == last_bad + incr) {
62 } else { 62 last_bad += incr;
63 if (start_bad) { 63 continue;
64 printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved",
65 val, start_bad, last_bad + incr);
66 reserve_early(start_bad, last_bad + incr, "BAD RAM");
67 }
68 start_bad = last_bad = start_phys_aligned;
69 }
70 } 64 }
65 if (start_bad)
66 reserve_bad_mem(pattern, start_bad, last_bad + incr);
67 start_bad = last_bad = start_phys_aligned;
71 } 68 }
72 if (start_bad) { 69 if (start_bad)
73 printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved", 70 reserve_bad_mem(pattern, start_bad, last_bad + incr);
74 val, start_bad, last_bad + incr); 71}
75 reserve_early(start_bad, last_bad + incr, "BAD RAM"); 72
73static void __init do_one_pass(u64 pattern, u64 start, u64 end)
74{
75 u64 size = 0;
76
77 while (start < end) {
78 start = find_e820_area_size(start, &size, 1);
79
80 /* done ? */
81 if (start >= end)
82 break;
83 if (start + size > end)
84 size = end - start;
85
86 printk(KERN_INFO " %010llx - %010llx pattern %016llx\n",
87 (unsigned long long) start,
88 (unsigned long long) start + size,
89 (unsigned long long) cpu_to_be64(pattern));
90 memtest(pattern, start, size);
91
92 start += size;
76 } 93 }
77} 94}
78 95
@@ -83,6 +100,9 @@ static int __init parse_memtest(char *arg)
83{ 100{
84 if (arg) 101 if (arg)
85 memtest_pattern = simple_strtoul(arg, NULL, 0); 102 memtest_pattern = simple_strtoul(arg, NULL, 0);
103 else
104 memtest_pattern = ARRAY_SIZE(patterns);
105
86 return 0; 106 return 0;
87} 107}
88 108
@@ -90,33 +110,22 @@ early_param("memtest", parse_memtest);
90 110
91void __init early_memtest(unsigned long start, unsigned long end) 111void __init early_memtest(unsigned long start, unsigned long end)
92{ 112{
93 u64 t_start, t_size; 113 unsigned int i;
94 unsigned pattern; 114 unsigned int idx = 0;
95 115
96 if (!memtest_pattern) 116 if (!memtest_pattern)
97 return; 117 return;
98 118
99 printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); 119 printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
100 for (pattern = 0; pattern < memtest_pattern; pattern++) { 120 for (i = 0; i < memtest_pattern; i++) {
101 t_start = start; 121 idx = i % ARRAY_SIZE(patterns);
102 t_size = 0; 122 do_one_pass(patterns[idx], start, end);
103 while (t_start < end) { 123 }
104 t_start = find_e820_area_size(t_start, &t_size, 1);
105
106 /* done ? */
107 if (t_start >= end)
108 break;
109 if (t_start + t_size > end)
110 t_size = end - t_start;
111
112 printk(KERN_CONT "\n %010llx - %010llx pattern %d",
113 (unsigned long long)t_start,
114 (unsigned long long)t_start + t_size, pattern);
115
116 memtest(t_start, t_size, pattern);
117 124
118 t_start += t_size; 125 if (idx > 0) {
119 } 126 printk(KERN_INFO "early_memtest: wipe out "
127 "test pattern from memory\n");
128 /* additional test with pattern 0 will do this */
129 do_one_pass(0, start, end);
120 } 130 }
121 printk(KERN_CONT "\n");
122} 131}
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-18 05:05:53 -0500