[mirror_ubuntu-kernels.git] / arch / x86 / mm / memtest.c

#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>

#define _MAX_MEM_PATTERNS 4

static void __init memtest(unsigned long start_phys, unsigned long size,
				 unsigned pattern)
{
	unsigned long i;
	unsigned long *start;
	unsigned long start_bad;
	unsigned long last_bad;
	unsigned long val;
	unsigned long start_phys_aligned;
	unsigned long count;
	unsigned long incr;

	pattern = pattern % _MAX_MEM_PATTERNS;

	switch (pattern) {
	case 0:
		val = 0UL;
		break;
	case 1:
		val = -1UL;
		break;
	case 2:
#ifdef CONFIG_X86_64
		val = 0x5555555555555555UL;
#else
		val = 0x55555555UL;
#endif
		break;
	case 3:
#ifdef CONFIG_X86_64
		val = 0xaaaaaaaaaaaaaaaaUL;
#else
		val = 0xaaaaaaaaUL;
#endif
		break;
	default:
		return;
	}

	incr = sizeof(unsigned long);
	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] = val;
	for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
		if (*start != val) {
			if (start_phys_aligned == last_bad + incr) {
				last_bad += incr;
			} else {
				if (start_bad) {
					printk(KERN_CONT "\n  %016lx bad mem addr %010lx - %010lx reserved",
						val, 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  %016lx bad mem addr %010lx - %010lx reserved",
			val, 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 pattern;

	if (!memtest_pattern)
		return;

	printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
	for (pattern = 0; pattern < memtest_pattern; pattern++) {
		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,
			       pattern % _MAX_MEM_PATTERNS);

			memtest(t_start, t_size, pattern);

			t_start += t_size;
		}
	}
	printk(KERN_CONT "\n");
}
Commit	Line	Data
1f067167 YL	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
40823f73 AH	12	#define _MAX_MEM_PATTERNS 4
40823f73 AH	13
1f067167 YL	14	static void __init memtest(unsigned long start_phys, unsigned long size,
	15	unsigned pattern)
	16	{
	17	unsigned long i;
	18	unsigned long *start;
	19	unsigned long start_bad;
	20	unsigned long last_bad;
	21	unsigned long val;
	22	unsigned long start_phys_aligned;
	23	unsigned long count;
	24	unsigned long incr;
	25
40823f73 AH	26	pattern = pattern % _MAX_MEM_PATTERNS;
40823f73 AH	27
1f067167 YL	28	switch (pattern) {
	29	case 0:
	30	val = 0UL;
	31	break;
	32	case 1:
	33	val = -1UL;
	34	break;
	35	case 2:
	36	#ifdef CONFIG_X86_64
	37	val = 0x5555555555555555UL;
	38	#else
	39	val = 0x55555555UL;
	40	#endif
	41	break;
	42	case 3:
	43	#ifdef CONFIG_X86_64
	44	val = 0xaaaaaaaaaaaaaaaaUL;
	45	#else
	46	val = 0xaaaaaaaaUL;
	47	#endif
	48	break;
	49	default:
	50	return;
	51	}
	52
	53	incr = sizeof(unsigned long);
	54	start_phys_aligned = ALIGN(start_phys, incr);
	55	count = (size - (start_phys_aligned - start_phys))/incr;
	56	start = __va(start_phys_aligned);
	57	start_bad = 0;
	58	last_bad = 0;
	59
	60	for (i = 0; i < count; i++)
	61	start[i] = val;
	62	for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
	63	if (*start != val) {
	64	if (start_phys_aligned == last_bad + incr) {
	65	last_bad += incr;
	66	} else {
	67	if (start_bad) {
2cb0ebee	68	printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved",
1f067167	69	val, start_bad, last_bad + incr);
2cb0ebee	70	reserve_early(start_bad, last_bad + incr, "BAD RAM");
1f067167 YL	71	}
	72	start_bad = last_bad = start_phys_aligned;
	73	}
	74	}
	75	}
	76	if (start_bad) {
	77	printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved",
	78	val, start_bad, last_bad + incr);
2cb0ebee	79	reserve_early(start_bad, last_bad + incr, "BAD RAM");
1f067167	80	}
1f067167 YL	81	}
	82
	83	/* default is disabled */
	84	static int memtest_pattern __initdata;
	85
	86	static int __init parse_memtest(char *arg)
	87	{
	88	if (arg)
	89	memtest_pattern = simple_strtoul(arg, NULL, 0);
	90	return 0;
	91	}
	92
	93	early_param("memtest", parse_memtest);
	94
	95	void __init early_memtest(unsigned long start, unsigned long end)
	96	{
	97	u64 t_start, t_size;
	98	unsigned pattern;
	99
	100	if (!memtest_pattern)
	101	return;
	102
	103	printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
	104	for (pattern = 0; pattern < memtest_pattern; pattern++) {
	105	t_start = start;
	106	t_size = 0;
	107	while (t_start < end) {
	108	t_start = find_e820_area_size(t_start, &t_size, 1);
	109
	110	/* done ? */
	111	if (t_start >= end)
	112	break;
	113	if (t_start + t_size > end)
	114	t_size = end - t_start;
	115
	116	printk(KERN_CONT "\n %010llx - %010llx pattern %d",
40823f73 AH	117	(unsigned long long)t_start,
	118	(unsigned long long)t_start + t_size,
	119	pattern % _MAX_MEM_PATTERNS);
1f067167 YL	120
	121	memtest(t_start, t_size, pattern);
	122
	123	t_start += t_size;
	124	}
	125	}
	126	printk(KERN_CONT "\n");
	127	}