# dmesg | grep PM
ACPI: PM-Timer IO Port: 0x808
# ./pmtmr_test 0x808 # run as root
./pmtmr_test: Detect PM-Timer Bug
If it detected a bug, it will show the above message.
Thanks.
--
OGAWA Hirofumi <[email protected]>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <error.h>
#include <sys/io.h>
typedef unsigned int u32;
static unsigned short pmtmr_ioport;
static int cnt;
#define ACPI_PM_MASK 0xFFFFFF /* limit it to 24 bits */
static u32 read_pmtmr(void)
{
u32 v1=0,v2=0,v3=0;
/* It has been reported that because of various broken
* chipsets (ICH4, PIIX4 and PIIX4E) where the ACPI PM time
* source is not latched, so you must read it multiple
* times to insure a safe value is read.
*/
cnt = 0;
do {
v1 = inl(pmtmr_ioport);
v2 = inl(pmtmr_ioport);
v3 = inl(pmtmr_ioport);
cnt++;
} while ((v1 > v2 && v1 < v3) || (v2 > v3 && v2 < v1)
|| (v3 > v1 && v3 < v2));
/* mask the output to 24 bits */
return v2 & ACPI_PM_MASK;
}
int main(int argc, char *argv[])
{
int i;
if (argc < 2)
error(1, 0, "Usage: %s pmtmr_port\n", argv[0]);
pmtmr_ioport = strtoul(argv[1], NULL, 0);
if ((pmtmr_ioport & 0xff) != 0x08)
error(1, 0, "Invalid port address: 0x%x\n", pmtmr_ioport);
if (iopl(3) < 0)
error(1, errno, "iopl");
for (i = 0; i < 10000000; i++) {
read_pmtmr();
if (cnt > 1)
error(1, 0, "Detect PM-Timer Bug\n");
if ((i % 100000) == 0)
printf("%d\n", i);
}
return 0;
}
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