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Diffstat (limited to 'arch/x86/mm/memtest.c')
-rw-r--r--arch/x86/mm/memtest.c156
1 files changed, 81 insertions, 75 deletions
diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index 9cab18b0b857..0bcd7883d036 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -9,44 +9,44 @@
#include <asm/e820.h>
-static void __init memtest(unsigned long start_phys, unsigned long size,
- unsigned pattern)
+static u64 patterns[] __initdata = {
+ 0,
+ 0xffffffffffffffffULL,
+ 0x5555555555555555ULL,
+ 0xaaaaaaaaaaaaaaaaULL,
+ 0x1111111111111111ULL,
+ 0x2222222222222222ULL,
+ 0x4444444444444444ULL,
+ 0x8888888888888888ULL,
+ 0x3333333333333333ULL,
+ 0x6666666666666666ULL,
+ 0x9999999999999999ULL,
+ 0xccccccccccccccccULL,
+ 0x7777777777777777ULL,
+ 0xbbbbbbbbbbbbbbbbULL,
+ 0xddddddddddddddddULL,
+ 0xeeeeeeeeeeeeeeeeULL,
+ 0x7a6c7258554e494cULL, /* yeah ;-) */
+};
+
+static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
{
- 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;
- }
+ printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n",
+ (unsigned long long) pattern,
+ (unsigned long long) start_bad,
+ (unsigned long long) end_bad);
+ reserve_early(start_bad, end_bad, "BAD RAM");
+}
- incr = sizeof(unsigned long);
+static void __init memtest(u64 pattern, u64 start_phys, u64 size)
+{
+ u64 i, count;
+ u64 *start;
+ u64 start_bad, last_bad;
+ u64 start_phys_aligned;
+ size_t incr;
+
+ incr = sizeof(pattern);
start_phys_aligned = ALIGN(start_phys, incr);
count = (size - (start_phys_aligned - start_phys))/incr;
start = __va(start_phys_aligned);
@@ -54,25 +54,42 @@ static void __init memtest(unsigned long start_phys, unsigned long size,
last_bad = 0;
for (i = 0; i < count; i++)
- start[i] = val;
+ start[i] = pattern;
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 == 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) {
- 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");
+ if (start_bad)
+ reserve_bad_mem(pattern, start_bad, last_bad + incr);
+}
+
+static void __init do_one_pass(u64 pattern, u64 start, u64 end)
+{
+ u64 size = 0;
+
+ while (start < end) {
+ start = find_e820_area_size(start, &size, 1);
+
+ /* done ? */
+ if (start >= end)
+ break;
+ if (start + size > end)
+ size = end - start;
+
+ printk(KERN_INFO " %010llx - %010llx pattern %016llx\n",
+ (unsigned long long) start,
+ (unsigned long long) start + size,
+ (unsigned long long) cpu_to_be64(pattern));
+ memtest(pattern, start, size);
+
+ start += size;
}
}
@@ -90,33 +107,22 @@ early_param("memtest", parse_memtest);
void __init early_memtest(unsigned long start, unsigned long end)
{
- u64 t_start, t_size;
- unsigned pattern;
+ unsigned int i;
+ unsigned int idx = 0;
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);
+ printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
+ for (i = 0; i < memtest_pattern; i++) {
+ idx = i % ARRAY_SIZE(patterns);
+ do_one_pass(patterns[idx], start, end);
+ }
- t_start += t_size;
- }
+ if (idx > 0) {
+ printk(KERN_INFO "early_memtest: wipe out "
+ "test pattern from memory\n");
+ /* additional test with pattern 0 will do this */
+ do_one_pass(0, start, end);
}
- printk(KERN_CONT "\n");
}
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