[deliverable/linux.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>

static u64 patterns[] __initdata = {
	0,
	0xffffffffffffffffULL,
	0x5555555555555555ULL,
	0xaaaaaaaaaaaaaaaaULL,
};

static void __init reserve_bad_mem(u64 pattern, unsigned long start_bad,
			    unsigned long end_bad)
{
	printk(KERN_CONT "\n  %016llx bad mem addr "
	       "%010lx - %010lx reserved",
	       (unsigned long long) pattern, start_bad, end_bad);
	reserve_early(start_bad, end_bad, "BAD RAM");
}

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)
			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);
}

/* 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");
}
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
6d74171b AH	12	static u64 patterns[] __initdata = {
	13	0,
	14	0xffffffffffffffffULL,
	15	0x5555555555555555ULL,
	16	0xaaaaaaaaaaaaaaaaULL,
	17	};
40823f73	18
7dad169e AH	19	static void __init reserve_bad_mem(u64 pattern, unsigned long start_bad,
	20	unsigned long end_bad)
	21	{
	22	printk(KERN_CONT "\n %016llx bad mem addr "
	23	"%010lx - %010lx reserved",
	24	(unsigned long long) pattern, start_bad, end_bad);
	25	reserve_early(start_bad, end_bad, "BAD RAM");
	26	}
	27
1f067167	28	static void __init memtest(unsigned long start_phys, unsigned long size,
6d74171b	29	u64 pattern)
1f067167 YL	30	{
1f067167 YL	31	unsigned long i;
6d74171b	32	u64 *start;
1f067167 YL	33	unsigned long start_bad;
1f067167 YL	34	unsigned long last_bad;
1f067167 YL	35	unsigned long start_phys_aligned;
	36	unsigned long count;
	37	unsigned long incr;
	38
6d74171b	39	incr = sizeof(pattern);
1f067167 YL	40	start_phys_aligned = ALIGN(start_phys, incr);
	41	count = (size - (start_phys_aligned - start_phys))/incr;
	42	start = __va(start_phys_aligned);
	43	start_bad = 0;
	44	last_bad = 0;
	45
	46	for (i = 0; i < count; i++)
6d74171b	47	start[i] = pattern;
1f067167	48	for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
7dad169e AH	49	if (*start == pattern)
	50	continue;
	51	if (start_phys_aligned == last_bad + incr) {
	52	last_bad += incr;
	53	continue;
1f067167	54	}
7dad169e AH	55	if (start_bad)
	56	reserve_bad_mem(pattern, start_bad, last_bad + incr);
	57	start_bad = last_bad = start_phys_aligned;
1f067167	58	}
7dad169e AH	59	if (start_bad)
7dad169e AH	60	reserve_bad_mem(pattern, start_bad, last_bad + incr);
1f067167 YL	61	}
	62
	63	/* default is disabled */
	64	static int memtest_pattern __initdata;
	65
	66	static int __init parse_memtest(char *arg)
	67	{
	68	if (arg)
	69	memtest_pattern = simple_strtoul(arg, NULL, 0);
	70	return 0;
	71	}
	72
	73	early_param("memtest", parse_memtest);
	74
	75	void __init early_memtest(unsigned long start, unsigned long end)
	76	{
	77	u64 t_start, t_size;
6d74171b AH	78	unsigned int i;
6d74171b AH	79	u64 pattern;
1f067167 YL	80
	81	if (!memtest_pattern)
	82	return;
	83
	84	printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
6d74171b AH	85	for (i = 0; i < memtest_pattern; i++) {
	86	unsigned int idx = i % ARRAY_SIZE(patterns);
	87	pattern = patterns[idx];
1f067167 YL	88	t_start = start;
	89	t_size = 0;
	90	while (t_start < end) {
	91	t_start = find_e820_area_size(t_start, &t_size, 1);
	92
	93	/* done ? */
	94	if (t_start >= end)
	95	break;
	96	if (t_start + t_size > end)
	97	t_size = end - t_start;
	98
	99	printk(KERN_CONT "\n %010llx - %010llx pattern %d",
40823f73	100	(unsigned long long)t_start,
6d74171b	101	(unsigned long long)t_start + t_size, idx);
1f067167 YL	102
	103	memtest(t_start, t_size, pattern);
	104
	105	t_start += t_size;
	106	}
	107	}
	108	printk(KERN_CONT "\n");
	109	}