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#include <linux/memblock.h> 10 11static u64 patterns[] __initdata = { 12 0, 13 0xffffffffffffffffULL, 14 0x5555555555555555ULL, 15 0xaaaaaaaaaaaaaaaaULL, 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 ;-) */ 29}; 30 31static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad) 32{ 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); 37 memblock_reserve(start_bad, end_bad - start_bad); 38} 39 40static void __init memtest(u64 pattern, u64 start_phys, u64 size) 41{ 42 u64 *p, *start, *end; 43 u64 start_bad, last_bad; 44 u64 start_phys_aligned; 45 const size_t incr = sizeof(pattern); 46 47 start_phys_aligned = ALIGN(start_phys, incr); 48 start = __va(start_phys_aligned); 49 end = start + (size - (start_phys_aligned - start_phys)) / incr; 50 start_bad = 0; 51 last_bad = 0; 52 53 for (p = start; p < end; p++) 54 *p = pattern; 55 56 for (p = start; p < end; p++, start_phys_aligned += incr) { 57 if (*p == pattern) 58 continue; 59 if (start_phys_aligned == last_bad + incr) { 60 last_bad += incr; 61 continue; 62 } 63 if (start_bad) 64 reserve_bad_mem(pattern, start_bad, last_bad + incr); 65 start_bad = last_bad = start_phys_aligned; 66 } 67 if (start_bad) 68 reserve_bad_mem(pattern, start_bad, last_bad + incr); 69} 70 71static void __init do_one_pass(u64 pattern, u64 start, u64 end) 72{ 73 u64 i; 74 phys_addr_t this_start, this_end; 75 76 for_each_free_mem_range(i, MAX_NUMNODES, &this_start, &this_end, NULL) { 77 this_start = clamp_t(phys_addr_t, this_start, start, end); 78 this_end = clamp_t(phys_addr_t, this_end, start, end); 79 if (this_start < this_end) { 80 printk(KERN_INFO " %010llx - %010llx pattern %016llx\n", 81 (unsigned long long)this_start, 82 (unsigned long long)this_end, 83 (unsigned long long)cpu_to_be64(pattern)); 84 memtest(pattern, this_start, this_end - this_start); 85 } 86 } 87} 88 89/* default is disabled */ 90static int memtest_pattern __initdata; 91 92static int __init parse_memtest(char *arg) 93{ 94 if (arg) 95 memtest_pattern = simple_strtoul(arg, NULL, 0); 96 else 97 memtest_pattern = ARRAY_SIZE(patterns); 98 99 return 0; 100} 101 102early_param("memtest", parse_memtest); 103 104void __init early_memtest(unsigned long start, unsigned long end) 105{ 106 unsigned int i; 107 unsigned int idx = 0; 108 109 if (!memtest_pattern) 110 return; 111 112 printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern); 113 for (i = 0; i < memtest_pattern; i++) { 114 idx = i % ARRAY_SIZE(patterns); 115 do_one_pass(patterns[idx], start, end); 116 } 117 118 if (idx > 0) { 119 printk(KERN_INFO "early_memtest: wipe out " 120 "test pattern from memory\n"); 121 /* additional test with pattern 0 will do this */ 122 do_one_pass(0, start, end); 123 } 124} 125