| Yinghai Lu | 1f06716 | 2008-07-15 00:02:28 -0700 | [diff] [blame] | 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 | } |