131 lines
3.0 KiB
C
131 lines
3.0 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 u64 patterns[] __initdata = {
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0,
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0xffffffffffffffffULL,
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0x5555555555555555ULL,
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0xaaaaaaaaaaaaaaaaULL,
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0x1111111111111111ULL,
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0x2222222222222222ULL,
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0x4444444444444444ULL,
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0x8888888888888888ULL,
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0x3333333333333333ULL,
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0x6666666666666666ULL,
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0x9999999999999999ULL,
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0xccccccccccccccccULL,
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0x7777777777777777ULL,
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0xbbbbbbbbbbbbbbbbULL,
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0xddddddddddddddddULL,
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0xeeeeeeeeeeeeeeeeULL,
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0x7a6c7258554e494cULL, /* yeah ;-) */
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};
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static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
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{
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printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n",
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(unsigned long long) pattern,
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(unsigned long long) start_bad,
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(unsigned long long) end_bad);
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reserve_early(start_bad, end_bad, "BAD RAM");
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}
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static void __init memtest(u64 pattern, u64 start_phys, u64 size)
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{
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u64 *p, *start, *end;
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u64 start_bad, last_bad;
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u64 start_phys_aligned;
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const size_t incr = sizeof(pattern);
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start_phys_aligned = ALIGN(start_phys, incr);
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start = __va(start_phys_aligned);
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end = start + (size - (start_phys_aligned - start_phys)) / incr;
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start_bad = 0;
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last_bad = 0;
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for (p = start; p < end; p++)
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*p = pattern;
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for (p = start; p < end; p++, start_phys_aligned += incr) {
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if (*p == pattern)
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continue;
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if (start_phys_aligned == last_bad + incr) {
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last_bad += incr;
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continue;
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}
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if (start_bad)
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reserve_bad_mem(pattern, start_bad, last_bad + incr);
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start_bad = last_bad = start_phys_aligned;
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}
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if (start_bad)
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reserve_bad_mem(pattern, start_bad, last_bad + incr);
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}
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static void __init do_one_pass(u64 pattern, u64 start, u64 end)
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{
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u64 size = 0;
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while (start < end) {
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start = find_e820_area_size(start, &size, 1);
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/* done ? */
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if (start >= end)
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break;
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if (start + size > end)
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size = end - start;
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printk(KERN_INFO " %010llx - %010llx pattern %016llx\n",
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(unsigned long long) start,
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(unsigned long long) start + size,
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(unsigned long long) cpu_to_be64(pattern));
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memtest(pattern, start, size);
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start += size;
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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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else
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memtest_pattern = ARRAY_SIZE(patterns);
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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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unsigned int i;
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unsigned int idx = 0;
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if (!memtest_pattern)
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return;
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printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
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for (i = 0; i < memtest_pattern; i++) {
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idx = i % ARRAY_SIZE(patterns);
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do_one_pass(patterns[idx], start, end);
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}
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if (idx > 0) {
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printk(KERN_INFO "early_memtest: wipe out "
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"test pattern from memory\n");
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/* additional test with pattern 0 will do this */
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do_one_pass(0, start, end);
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}
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}
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