- init var

[packages/util-linux.git] / util-linux-ppc-hwclock.patch

diff -urN util-linux-2.11n.org/clock-ppc.c util-linux-2.11n/clock-ppc.c
--- util-linux-2.11n.org/clock-ppc.c	Thu Jan  1 01:00:00 1970
+++ util-linux-2.11n/clock-ppc.c	Thu Mar  7 21:15:39 2002
@@ -0,0 +1,472 @@
+#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 <linux/version.h>
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,0)
+#include <asm/cuda.h>
+#else
+#include <linux/cuda.h>
+#endif
+
+/*
+ * 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"
+#define ADB_PACKET      0
+#define CUDA_PACKET     1
+#define ERROR_PACKET    2
+#define TIMER_PACKET    3
+#define POWER_PACKET    4
+#define MACIIC_PACKET   5
+#define PMU_PACKET      6
+
+/* 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, --hctosys: set system time from CMOS clock\n"
+    "  a, --systohc: get system time and adjust CMOS clock\n"
+    "  u, --utc: 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];
+
+  /*  get clock-ppc to accept systohc, hctosys options like hwclock */
+  /* this will avoid having to customize initscripts for Mandrake PPC */
+  /*  May 15 2001 - S. Benedict <sbenedict@mandrakesoft.com>        */
+  extern char *optarg; 
+
+  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);
+	case '-':
+	   if (!strncmp(optarg, "systohc", 7)) {
+	     adjustit = 1;
+	     break;
+	   } 
+	   if (!strncmp(optarg, "hctosys", 7)) {
+	     setit = 1;
+	     break;
+	   } 
+	   if (!strncmp(optarg, "localtime", 9)) {
+	     universal = 0;
+	     break;
+	   } 
+	   if (!strncmp(optarg, "utc", 3)) {
+	     universal = 1;
+	     break;
+	   } 
+	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), 
+		  &not_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 */
+}