[linux-2.6-block.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 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;

	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);

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