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#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");
}
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