/*
From t-matsuu@protein.osaka-u.ac.jp Sat Jan 22 13:43:20 2000
Date: Sat, 22 Jan 2000 21:42:54 +0900 (JST)
To: Andries.Brouwer@cwi.nl
Subject: Please merge the source for PPC
From: MATSUURA Takanori <t-matsuu@protein.osaka-u.ac.jp>
Even now, it is used clock-1.1 based source on Linux for PowerPC
architecture, attached on this mail.
Please merge this source in main util-linux source.
But I'm not an author of this source, but Paul Mackerras.
http://linuxcare.com.au/paulus/
shows details of him.
MATSUURA Takanori @ Division of Protein Chemistry,
Institute for Protein Research, Osaka University, Japan
E-Mail: t-matsuu@protein.osaka-u.ac.jp
Web Page: http://www.protein.osaka-u.ac.jp/chemistry/matsuura/
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/time.h>
#include <asm/cuda.h>
/*
* Adapted for Power Macintosh by Paul Mackerras.
*/
/* V1.0
* CMOS clock manipulation - Charles Hedrick, hedrick@cs.rutgers.edu, Apr 1992
*
* clock [-u] -r - read cmos clock
* clock [-u] -w - write cmos clock from system time
* clock [-u] -s - set system time from cmos clock
* clock [-u] -a - set system time from cmos clock, adjust the time to
* correct for systematic error, and put it back to the cmos.
* -u indicates cmos clock is kept in universal time
*
* The program is designed to run setuid, since we need to be able to
* write to the CUDA.
*
*********************
* V1.1
* Modified for clock adjustments - Rob Hooft, hooft@chem.ruu.nl, Nov 1992
* Also moved error messages to stderr. The program now uses getopt.
* Changed some exit codes. Made 'gcc 2.3 -Wall' happy.
*
* I think a small explanation of the adjustment routine should be given
* here. The problem with my machine is that its CMOS clock is 10 seconds
* per day slow. With this version of clock.c, and my '/etc/rc.local'
* reading '/etc/clock -au' instead of '/etc/clock -u -s', this error
* is automatically corrected at every boot.
*
* To do this job, the program reads and writes the file '/etc/adjtime'
* to determine the correction, and to save its data. In this file are
* three numbers:
*
* 1) the correction in seconds per day (So if your clock runs 5
* seconds per day fast, the first number should read -5.0)
* 2) the number of seconds since 1/1/1970 the last time the program was
* used.
* 3) the remaining part of a second which was leftover after the last
* adjustment
*
* Installation and use of this program:
*
* a) create a file '/etc/adjtime' containing as the first and only line:
* '0.0 0 0.0'
* b) run 'clock -au' or 'clock -a', depending on whether your cmos is in
* universal or local time. This updates the second number.
* c) set your system time using the 'date' command.
* d) update your cmos time using 'clock -wu' or 'clock -w'
* e) replace the first number in /etc/adjtime by your correction.
* f) put the command 'clock -au' or 'clock -a' in your '/etc/rc.local'
*
* If the adjustment doesn't work for you, try contacting me by E-mail.
*
******
* V1.2
*
* Applied patches by Harald Koenig (koenig@nova.tat.physik.uni-tuebingen.de)
* Patched and indented by Rob Hooft (hooft@EMBL-Heidelberg.DE)
*
* A free quote from a MAIL-message (with spelling corrections):
*
* "I found the explanation and solution for the CMOS reading 0xff problem
* in the 0.99pl13c (ALPHA) kernel: the RTC goes offline for a small amount
* of time for updating. Solution is included in the kernel source
* (linux/kernel/time.c)."
*
* "I modified clock.c to fix this problem and added an option (now default,
* look for USE_INLINE_ASM_IO) that I/O instructions are used as inline
* code and not via /dev/port (still possible via #undef ...)."
*
* With the new code, which is partially taken from the kernel sources,
* the CMOS clock handling looks much more "official".
* Thanks Harald (and Torsten for the kernel code)!
*
******
* V1.3
* Canges from alan@spri.levels.unisa.edu.au (Alan Modra):
* a) Fix a few typos in comments and remove reference to making
* clock -u a cron job. The kernel adjusts cmos time every 11
* minutes - see kernel/sched.c and kernel/time.c set_rtc_mmss().
* This means we should really have a cron job updating
* /etc/adjtime every 11 mins (set last_time to the current time
* and not_adjusted to ???).
* b) Swapped arguments of outb() to agree with asm/io.h macro of the
* same name. Use outb() from asm/io.h as it's slightly better.
* c) Changed CMOS_READ and CMOS_WRITE to inline functions. Inserted
* cli()..sti() pairs in appropriate places to prevent possible
* errors, and changed ioperm() call to iopl() to allow cli.
* d) Moved some variables around to localise them a bit.
* e) Fixed bug with clock -ua or clock -us that cleared environment
* variable TZ. This fix also cured the annoying display of bogus
* day of week on a number of machines. (Use mktime(), ctime()
* rather than asctime() )
* f) Use settimeofday() rather than stime(). This one is important
* as it sets the kernel's timezone offset, which is returned by
* gettimeofday(), and used for display of MSDOS and OS2 file
* times.
* g) faith@cs.unc.edu added -D flag for debugging
*
* V1.4: alan@SPRI.Levels.UniSA.Edu.Au (Alan Modra)
* Wed Feb 8 12:29:08 1995, fix for years > 2000.
* faith@cs.unc.edu added -v option to print version.
*
* August 1996 Tom Dyas (tdyas@eden.rutgers.edu)
* Converted to be compatible with the SPARC /dev/rtc driver.
*
*/
#define VERSION "1.4"
/* Here the information for time adjustments is kept. */
#define ADJPATH "/etc/adjtime"
/* Apparently the RTC on PowerMacs stores seconds since 1 Jan 1904 */
#define RTC_OFFSET 2082844800
/* used for debugging the code. */
/*#define KEEP_OFF */
/* Globals */
int readit = 0;
int adjustit = 0;
int writeit = 0;
int setit = 0;
int universal = 0;
int debug = 0;
time_t mkgmtime(struct tm *);
volatile void
usage ( void )
{
(void) fprintf (stderr,
"clock [-u] -r|w|s|a|v\n"
" r: read and print CMOS clock\n"
" w: write CMOS clock from system time\n"
" s: set system time from CMOS clock\n"
" a: get system time and adjust CMOS clock\n"
" u: CMOS clock is in universal time\n"
" v: print version (" VERSION ") and exit\n"
);
exit(EXIT_FAILURE);
}
int adb_fd;
void
adb_init ( void )
{
adb_fd = open ("/dev/adb", 2);
if (adb_fd < 0)
{
perror ("unable to open /dev/adb read/write : ");
exit(EXIT_FAILURE);
}
}
unsigned char get_packet[2] = { (unsigned char) CUDA_PACKET,
(unsigned char) CUDA_GET_TIME };
unsigned char set_packet[6] = { (unsigned char) CUDA_PACKET,
(unsigned char) CUDA_SET_TIME };
int
main (int argc, char **argv )
{
struct tm tm, *tmp;
time_t systime;
time_t last_time;
time_t clock_time;
int i, arg;
double factor;
double not_adjusted;
int adjustment = 0;
/* unsigned char save_control, save_freq_select; */
unsigned char reply[16];
while ((arg = getopt (argc, argv, "rwsuaDv")) != -1)
{
switch (arg)
{
case 'r':
readit = 1;
break;
case 'w':
writeit = 1;
break;
case 's':
setit = 1;
break;
case 'u':
universal = 1;
break;
case 'a':
adjustit = 1;
break;
case 'D':
debug = 1;
break;
case 'v':
(void) fprintf( stderr, "clock " VERSION "\n" );
exit(EXIT_SUCCESS);
default:
usage ();
}
}
/* If we are in MkLinux do not even bother trying to set the clock */
if(!access("/proc/osfmach3/version", R_OK))
{ /* We're running MkLinux */
if ( readit | writeit | setit | adjustit )
printf("You must change the clock setting in MacOS.\n");
exit(0);
}
if (readit + writeit + setit + adjustit > 1)
usage (); /* only allow one of these */
if (!(readit | writeit | setit | adjustit)) /* default to read */
readit = 1;
adb_init ();
if (adjustit)
{ /* Read adjustment parameters first */
FILE *adj;
if ((adj = fopen (ADJPATH, "r")) == NULL)
{
perror (ADJPATH);
exit(EXIT_FAILURE);
}
if (fscanf (adj, "%lf %d %lf", &factor, (int *) (&last_time),
¬_adjusted) < 0)
{
perror (ADJPATH);
exit(EXIT_FAILURE);
}
(void) fclose (adj);
if (debug) (void) printf(
"Last adjustment done at %d seconds after 1/1/1970\n",
(int) last_time);
}
if (readit || setit || adjustit)
{
int ii;
if (write(adb_fd, get_packet, sizeof(get_packet)) < 0) {
perror("write adb");
exit(EXIT_FAILURE);
}
ii = (int) read(adb_fd, reply, sizeof(reply));
if (ii < 0) {
perror("read adb");
exit(EXIT_FAILURE);
}
if (ii != 7)
(void) fprintf(stderr,
"Warning: bad reply length from CUDA (%d)\n", ii);
clock_time = (time_t) ((reply[3] << 24) + (reply[4] << 16)
+ (reply[5] << 8)) + (time_t) reply[6];
clock_time -= RTC_OFFSET;
if (universal) {
systime = clock_time;
} else {
tm = *gmtime(&clock_time);
(void) printf("time in rtc is %s", asctime(&tm));
tm.tm_isdst = -1; /* don't know whether it's DST */
systime = mktime(&tm);
}
}
if (readit)
{
(void) printf ("%s", ctime (&systime ));
}
if (setit || adjustit)
{
struct timeval tv;
struct timezone tz;
/* program is designed to run setuid, be secure! */
if (getuid () != 0)
{
(void) fprintf (stderr,
"Sorry, must be root to set or adjust time\n");
exit(EXIT_FAILURE);
}
if (adjustit)
{ /* the actual adjustment */
double exact_adjustment;
exact_adjustment = ((double) (systime - last_time))
* factor / (24 * 60 * 60)
+ not_adjusted;
if (exact_adjustment > 0.)
adjustment = (int) (exact_adjustment + 0.5);
else
adjustment = (int) (exact_adjustment - 0.5);
not_adjusted = exact_adjustment - (double) adjustment;
systime += adjustment;
if (debug) {
(void) printf ("Time since last adjustment is %d seconds\n",
(int) (systime - last_time));
(void) printf ("Adjusting time by %d seconds\n",
adjustment);
(void) printf ("remaining adjustment is %.3f seconds\n",
not_adjusted);
}
}
#ifndef KEEP_OFF
tv.tv_sec = systime;
tv.tv_usec = 0;
tz.tz_minuteswest = timezone / 60;
tz.tz_dsttime = daylight;
if (settimeofday (&tv, &tz) != 0)
{
(void) fprintf (stderr,
"Unable to set time -- probably you are not root\n");
exit(EXIT_FAILURE);
}
if (debug) {
(void) printf( "Called settimeofday:\n" );
(void) printf( "\ttv.tv_sec = %ld, tv.tv_usec = %ld\n",
tv.tv_sec, tv.tv_usec );
(void) printf( "\ttz.tz_minuteswest = %d, tz.tz_dsttime = %d\n",
tz.tz_minuteswest, tz.tz_dsttime );
}
#endif
}
if (writeit || (adjustit && adjustment != 0))
{
systime = time (NULL);
if (universal) {
clock_time = systime;
} else {
tmp = localtime(&systime);
clock_time = mkgmtime(tmp);
}
clock_time += RTC_OFFSET;
set_packet[2] = clock_time >> 24;
set_packet[3] = clock_time >> 16;
set_packet[4] = clock_time >> 8;
set_packet[5] = (unsigned char) clock_time;
if (write(adb_fd, set_packet, sizeof(set_packet)) < 0) {
perror("write adb (set)");
exit(EXIT_FAILURE);
}
i = (int) read(adb_fd, reply, sizeof(reply));
if (debug) {
int j;
(void) printf("set reply %d bytes:", i);
for (j = 0; j < i; ++j)
(void) printf(" %.2x", (unsigned int) reply[j]);
(void) printf("\n");
}
if (i != 3 || reply[1] != (unsigned char) 0)
(void) fprintf(stderr, "Warning: error %d setting RTC\n",
(int) reply[1]);
if (debug) {
clock_time -= RTC_OFFSET;
(void) printf("set RTC to %s", asctime(gmtime(&clock_time)));
}
}
else
if (debug) (void) printf ("CMOS clock unchanged.\n");
/* Save data for next 'adjustit' call */
if (adjustit)
{
FILE *adj;
if ((adj = fopen (ADJPATH, "w")) == NULL)
{
perror (ADJPATH);
exit(EXIT_FAILURE);
}
(void) fprintf (adj, "%f %d %f\n", factor, (int) systime, not_adjusted);
(void) fclose (adj);
}
exit(EXIT_SUCCESS);
}
/* Stolen from linux/arch/i386/kernel/time.c. */
/* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
* Assumes input in normal date format, i.e. 1980-12-31 23:59:59
* => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
*
* [For the Julian calendar (which was used in Russia before 1917,
* Britain & colonies before 1752, anywhere else before 1582,
* and is still in use by some communities) leave out the
* -year/100+year/400 terms, and add 10.]
*
* This algorithm was first published by Gauss (I think).
*
* WARNING: this function will overflow on 2106-02-07 06:28:16 on
* machines were long is 32-bit! (However, as time_t is signed, we
* will already get problems at other places on 2038-01-19 03:14:08)
*/
time_t mkgmtime(struct tm *tm)
{
int mon = tm->tm_mon + 1;
int year = tm->tm_year + 1900;
if (0 >= (int) (mon -= 2)) { /* 1..12 -> 11,12,1..10 */
mon += 12; /* Puts Feb last since it has leap day */
year -= 1;
}
return (((
(unsigned long)(year/4 - year/100 + year/400 + 367*mon/12) +
tm->tm_mday + year*365 - 719499
)*24 + tm->tm_hour /* now have hours */
)*60 + tm->tm_min /* now have minutes */
)*60 + tm->tm_sec; /* finally seconds */
}
