| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/mm.h> |
| #include <linux/smp.h> |
| #include <linux/init.h> |
| #include <linux/pfn.h> |
| #include <linux/memblock.h> |
| |
| static u64 patterns[] __initdata = { |
| 0, |
| 0xffffffffffffffffULL, |
| 0x5555555555555555ULL, |
| 0xaaaaaaaaaaaaaaaaULL, |
| 0x1111111111111111ULL, |
| 0x2222222222222222ULL, |
| 0x4444444444444444ULL, |
| 0x8888888888888888ULL, |
| 0x3333333333333333ULL, |
| 0x6666666666666666ULL, |
| 0x9999999999999999ULL, |
| 0xccccccccccccccccULL, |
| 0x7777777777777777ULL, |
| 0xbbbbbbbbbbbbbbbbULL, |
| 0xddddddddddddddddULL, |
| 0xeeeeeeeeeeeeeeeeULL, |
| 0x7a6c7258554e494cULL, /* yeah ;-) */ |
| }; |
| |
| static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad) |
| { |
| printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n", |
| (unsigned long long) pattern, |
| (unsigned long long) start_bad, |
| (unsigned long long) end_bad); |
| memblock_x86_reserve_range(start_bad, end_bad, "BAD RAM"); |
| } |
| |
| static void __init memtest(u64 pattern, u64 start_phys, u64 size) |
| { |
| u64 *p, *start, *end; |
| u64 start_bad, last_bad; |
| u64 start_phys_aligned; |
| const size_t incr = sizeof(pattern); |
| |
| start_phys_aligned = ALIGN(start_phys, incr); |
| start = __va(start_phys_aligned); |
| end = start + (size - (start_phys_aligned - start_phys)) / incr; |
| start_bad = 0; |
| last_bad = 0; |
| |
| for (p = start; p < end; p++) |
| *p = pattern; |
| |
| for (p = start; p < end; p++, start_phys_aligned += incr) { |
| if (*p == pattern) |
| continue; |
| if (start_phys_aligned == last_bad + incr) { |
| last_bad += incr; |
| continue; |
| } |
| if (start_bad) |
| reserve_bad_mem(pattern, start_bad, last_bad + incr); |
| start_bad = last_bad = start_phys_aligned; |
| } |
| if (start_bad) |
| reserve_bad_mem(pattern, start_bad, last_bad + incr); |
| } |
| |
| static void __init do_one_pass(u64 pattern, u64 start, u64 end) |
| { |
| u64 size = 0; |
| |
| while (start < end) { |
| start = memblock_x86_find_in_range_size(start, &size, 1); |
| |
| /* done ? */ |
| if (start >= end) |
| break; |
| if (start + size > end) |
| size = end - start; |
| |
| printk(KERN_INFO " %010llx - %010llx pattern %016llx\n", |
| (unsigned long long) start, |
| (unsigned long long) start + size, |
| (unsigned long long) cpu_to_be64(pattern)); |
| memtest(pattern, start, size); |
| |
| start += size; |
| } |
| } |
| |
| /* default is disabled */ |
| static int memtest_pattern __initdata; |
| |
| static int __init parse_memtest(char *arg) |
| { |
| if (arg) |
| memtest_pattern = simple_strtoul(arg, NULL, 0); |
| else |
| memtest_pattern = ARRAY_SIZE(patterns); |
| |
| return 0; |
| } |
| |
| early_param("memtest", parse_memtest); |
| |
| void __init early_memtest(unsigned long start, unsigned long end) |
| { |
| unsigned int i; |
| unsigned int idx = 0; |
| |
| if (!memtest_pattern) |
| return; |
| |
| printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern); |
| for (i = 0; i < memtest_pattern; i++) { |
| idx = i % ARRAY_SIZE(patterns); |
| do_one_pass(patterns[idx], start, end); |
| } |
| |
| if (idx > 0) { |
| printk(KERN_INFO "early_memtest: wipe out " |
| "test pattern from memory\n"); |
| /* additional test with pattern 0 will do this */ |
| do_one_pass(0, start, end); |
| } |
| } |