#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 <asm/e820.h> static u64 patterns[] __initdata = { 0, 0xffffffffffffffffULL, 0x5555555555555555ULL, 0xaaaaaaaaaaaaaaaaULL, }; static void __init memtest(unsigned long start_phys, unsigned long size, u64 pattern) { unsigned long i; u64 *start; unsigned long start_bad; unsigned long last_bad; unsigned long start_phys_aligned; unsigned long count; unsigned long incr; incr = sizeof(pattern); start_phys_aligned = ALIGN(start_phys, incr); count = (size - (start_phys_aligned - start_phys))/incr; start = __va(start_phys_aligned); start_bad = 0; last_bad = 0; for (i = 0; i < count; i++) start[i] = pattern; for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { if (*start != pattern) { if (start_phys_aligned == last_bad + incr) { last_bad += incr; } else { if (start_bad) { printk(KERN_CONT "\n %016llx bad mem addr %010lx - %010lx reserved", (unsigned long long) pattern, start_bad, last_bad + incr); reserve_early(start_bad, last_bad + incr, "BAD RAM"); } start_bad = last_bad = start_phys_aligned; } } } if (start_bad) { printk(KERN_CONT "\n %016llx bad mem addr %010lx - %010lx reserved", (unsigned long long) pattern, start_bad, last_bad + incr); reserve_early(start_bad, last_bad + incr, "BAD RAM"); } } /* default is disabled */ static int memtest_pattern __initdata; static int __init parse_memtest(char *arg) { if (arg) memtest_pattern = simple_strtoul(arg, NULL, 0); return 0; } early_param("memtest", parse_memtest); void __init early_memtest(unsigned long start, unsigned long end) { u64 t_start, t_size; unsigned int i; u64 pattern; if (!memtest_pattern) return; printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); for (i = 0; i < memtest_pattern; i++) { unsigned int idx = i % ARRAY_SIZE(patterns); pattern = patterns[idx]; t_start = start; t_size = 0; while (t_start < end) { t_start = find_e820_area_size(t_start, &t_size, 1); /* done ? */ if (t_start >= end) break; if (t_start + t_size > end) t_size = end - t_start; printk(KERN_CONT "\n %010llx - %010llx pattern %d", (unsigned long long)t_start, (unsigned long long)t_start + t_size, idx); memtest(t_start, t_size, pattern); t_start += t_size; } } printk(KERN_CONT "\n"); }