124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/pfn.h>
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#include <asm/e820.h>
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static void __init memtest(unsigned long start_phys, unsigned long size,
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unsigned pattern)
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{
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unsigned long i;
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unsigned long *start;
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unsigned long start_bad;
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unsigned long last_bad;
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unsigned long val;
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unsigned long start_phys_aligned;
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unsigned long count;
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unsigned long incr;
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switch (pattern) {
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case 0:
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val = 0UL;
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break;
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case 1:
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val = -1UL;
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break;
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case 2:
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#ifdef CONFIG_X86_64
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val = 0x5555555555555555UL;
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#else
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val = 0x55555555UL;
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#endif
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break;
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case 3:
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#ifdef CONFIG_X86_64
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val = 0xaaaaaaaaaaaaaaaaUL;
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#else
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val = 0xaaaaaaaaUL;
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#endif
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break;
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default:
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return;
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}
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incr = sizeof(unsigned long);
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start_phys_aligned = ALIGN(start_phys, incr);
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count = (size - (start_phys_aligned - start_phys))/incr;
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start = __va(start_phys_aligned);
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start_bad = 0;
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last_bad = 0;
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for (i = 0; i < count; i++)
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start[i] = val;
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for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
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if (*start != val) {
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if (start_phys_aligned == last_bad + incr) {
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last_bad += incr;
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} else {
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if (start_bad) {
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printk(KERN_CONT "\n %010lx bad mem addr %010lx - %010lx reserved",
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val, start_bad, last_bad + incr);
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reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
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}
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start_bad = last_bad = start_phys_aligned;
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}
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}
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}
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if (start_bad) {
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printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved",
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val, start_bad, last_bad + incr);
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reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
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}
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}
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/* default is disabled */
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static int memtest_pattern __initdata;
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static int __init parse_memtest(char *arg)
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{
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if (arg)
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memtest_pattern = simple_strtoul(arg, NULL, 0);
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return 0;
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}
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early_param("memtest", parse_memtest);
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void __init early_memtest(unsigned long start, unsigned long end)
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{
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u64 t_start, t_size;
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unsigned pattern;
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if (!memtest_pattern)
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return;
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printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
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for (pattern = 0; pattern < memtest_pattern; pattern++) {
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t_start = start;
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t_size = 0;
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while (t_start < end) {
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t_start = find_e820_area_size(t_start, &t_size, 1);
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/* done ? */
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if (t_start >= end)
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break;
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if (t_start + t_size > end)
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t_size = end - t_start;
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printk(KERN_CONT "\n %010llx - %010llx pattern %d",
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(unsigned long long)t_start,
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(unsigned long long)t_start + t_size, pattern);
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memtest(t_start, t_size, pattern);
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t_start += t_size;
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}
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}
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printk(KERN_CONT "\n");
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}
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