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. removed readclock command and cmos driver.

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. replaced by a readclock 'driver' that runs once, a re-imported version
  of the minix 2.0.4 readclock command.
. this has also restored cmos writing.
. readclock wrapper script calls service command to run /bin/readclock.drv
  once.
This commit is contained in:
Ben Gras 2007-01-12 16:35:04 +00:00
parent f65b3b8fbf
commit f47aa04a30
12 changed files with 435 additions and 550 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
commands/ibm/Makefile
View file

@ -20,7 +20,6 @@ ALL = \
partition \
playwave \
postmort \
readclock \
recwave \
repartition \
screendump \
@ -76,10 +75,6 @@ postmort: postmort.c
$(CCLD) -o $@ $?
install -S 4kw $@
readclock: readclock.c
$(CCLD) -o $@ $?
install -S 4kw $@
recwave: recwave.c
$(CCLD) -o $@ $?
install -S 16kw $@
@ -111,13 +106,11 @@ install: \
/usr/bin/partition \
/usr/bin/playwave \
/usr/bin/postmort \
/usr/bin/readclock \
/usr/bin/recwave \
/usr/bin/repartition \
/usr/bin/screendump \
/usr/bin/sdump \
/bin/loadkeys \
/bin/readclock \
/usr/bin/atnormalize: atnormalize
install -cs -o bin $? $@
@ -158,9 +151,6 @@ install: \
/usr/bin/postmort: postmort
install -cs -o bin $? $@
/usr/bin/readclock: readclock
install -cs -o bin $? $@
/usr/bin/recwave: recwave
install -cs -o bin $? $@
@ -176,8 +166,5 @@ install: \
/bin/loadkeys: /usr/bin/loadkeys
install -lcs $? $@
/bin/readclock: /usr/bin/readclock
install -lcs $? $@
clean:
rm -rf $(ALL) a.out core

226
commands/ibm/readclock.c
View file

@ -1,226 +0,0 @@
/* setime - set the system time from the real time clock
Authors: T. Holm & E. Froese
Adapted by: Jorrit .N. Herder */
/************************************************************************/
/* Readclock was updated for security reasons: openeing /dev/mem no */
/* longer automatically grants I/O privileges to the calling process */
/* so that the CMOS' clock could not be read from this program. The */
/* new approach is to rely on the FS to do the CMOS I/O, via the new */
/* system call CMOSTIME (which only reads the current clock value and */
/* cannot update the CMOS clock). */
/* The original readclock.c is still available under backup.c. */
/************************************************************************/
/* */
/* readclock.c */
/* */
/* Read the clock value from the 64 byte CMOS RAM */
/* area, then set system time. */
/* */
/* If the machine ID byte is 0xFC or 0xF8, the device */
/* /dev/mem exists and can be opened for reading, */
/* and no errors in the CMOS RAM are reported by the */
/* RTC, then the time is read from the clock RAM */
/* area maintained by the RTC. */
/* */
/* The clock RAM values are decoded and fed to mktime */
/* to make a time_t value, then stime(2) is called. */
/* */
/* This fails if: */
/* */
/* If the machine ID does not match 0xFC or 0xF8 (no */
/* error message.) */
/* */
/* If the machine ID is 0xFC or 0xF8 and /dev/mem */
/* is missing, or cannot be accessed. */
/* */
/* If the RTC reports errors in the CMOS RAM. */
/* */
/************************************************************************/
/* origination 1987-Dec-29 efth */
/* robustness 1990-Oct-06 C. Sylvain */
/* incorp. B. Evans ideas 1991-Jul-06 C. Sylvain */
/* set time & calibrate 1992-Dec-17 Kees J. Bot */
/* clock timezone 1993-Oct-10 Kees J. Bot */
/* set CMOS clock 1994-Jun-12 Kees J. Bot */
/* removed set CMOS 2004-Sep-06 Jorrit N. Herder */
/************************************************************************/
#include <minix/callnr.h>
#include <minix/config.h>
#include <minix/type.h>
#include <minix/const.h>
#include <minix/com.h>
#include <minix/syslib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioc_cmos.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <signal.h>
#include <minix/portio.h>
#include <ibm/cmos.h>
#include <sys/svrctl.h>
#define MAX_RETRIES 1
int nflag = 0; /* Tell what, but don't do it. */
int y2kflag = 0; /* Interpret 1980 as 2000 for clock with Y2K bug. */
char clocktz[128]; /* Timezone of the clock. */
#define MACH_ID_ADDR 0xFFFFE /* BIOS Machine ID at FFFF:000E */
#define PC_AT 0xFC /* Machine ID byte for PC/AT,
PC/XT286, and PS/2 Models 50, 60 */
#define PS_386 0xF8 /* Machine ID byte for PS/2 Model 80 */
/* Manufacturers usually use the ID value of the IBM model they emulate.
* However some manufacturers, notably HP and COMPAQ, have had different
* ideas in the past.
*
* Machine ID byte information source:
* _The Programmer's PC Sourcebook_ by Thom Hogan,
* published by Microsoft Press
*/
void errmsg(char *s);
int bcd_to_dec(int n);
int dec_to_bcd(int n);
void usage(void);
#define CMOS_DEV "/dev/cmos"
PUBLIC int main(int argc, char **argv)
{
int fd;
struct tm time1;
struct tm time2;
struct tm tmnow;
char date[64];
time_t now, rtc;
int i, s, mem;
unsigned char mach_id, cmos_state;
struct sysgetenv sysgetenv;
message m;
int request;
/* Process options. */
while (argc > 1) {
char *p = *++argv;
if (*p++ != '-') usage();
while (*p != 0) {
switch (*p++) {
case 'n': nflag = 1; break;
case '2': y2kflag = 1; break;
default: usage();
}
}
argc--;
}
#if DEAD_CODE
/* The hardware clock may run in a different time zone, likely GMT or
* winter time. Select that time zone.
*/
strcpy(clocktz, "TZ=");
sysgetenv.key = "TZ";
sysgetenv.keylen = 2+1;
sysgetenv.val = clocktz+3;
sysgetenv.vallen = sizeof(clocktz)-3;
if (svrctl(SYSGETENV, &sysgetenv) == 0) {
putenv(clocktz);
tzset();
}
#endif
/* Read the CMOS real time clock. */
for (i = 0; i < MAX_RETRIES; i++) {
/* sleep, unless first iteration */
if (i > 0) sleep(5);
/* Open the CMOS device to read the system time. */
if ((fd = open(CMOS_DEV, O_RDONLY)) < 0) {
perror(CMOS_DEV);
fprintf(stderr, "Couldn't open CMOS device.\n");
exit(1);
}
request = (y2kflag) ? CIOCGETTIME : CIOCGETTIMEY2K;
if ((s=ioctl(fd, request, (void *) &time1)) < 0) {
perror("ioctl");
fprintf(stderr, "Couldn't do CMOS ioctl.\n");
exit(1);
}
close(fd);
now = time(NULL);
time1.tm_isdst = -1; /* Do timezone calculations. */
time2 = time1;
rtc= mktime(&time1); /* Transform to a time_t. */
if (rtc != -1) {
break;
}
fprintf(stderr,
"readclock: Invalid time read from CMOS RTC: %d-%02d-%02d %02d:%02d:%02d\n",
time2.tm_year+1900, time2.tm_mon+1, time2.tm_mday,
time2.tm_hour, time2.tm_min, time2.tm_sec);
}
if (i >= MAX_RETRIES) exit(1);
/* Now set system time. */
if (nflag) {
printf("stime(%lu)\n", (unsigned long) rtc);
} else {
if (stime(&rtc) < 0) {
errmsg( "Not allowed to set time." );
exit(1);
}
}
tmnow = *localtime(&rtc);
if (strftime(date, sizeof(date),
"%a %b %d %H:%M:%S %Z %Y", &tmnow) != 0) {
if (date[8] == '0') date[8]= ' ';
#if 0
printf("%s [CMOS read via FS, see command/ibm/readclock.c]\n", date);
#endif
}
exit(0);
}
void errmsg(char *s)
{
static char *prompt = "readclock: ";
fprintf(stderr, "%s%s\n", prompt, s);
prompt = "";
}
int bcd_to_dec(int n)
{
return ((n >> 4) & 0x0F) * 10 + (n & 0x0F);
}
int dec_to_bcd(int n)
{
return ((n / 10) << 4) | (n % 10);
}
void usage(void)
{
fprintf(stderr, "Usage: settime [-n2]\n");
exit(1);
}

8
commands/scripts/MAKEDEV.sh
View file

@ -19,7 +19,7 @@ case $#:$1 in
ttypa ttypb ttypc ttypd ttype ttypf \
ttyq0 ttyq1 ttyq2 ttyq3 ttyq4 ttyq5 ttyq6 ttyq7 ttyq8 ttyq9 \
ttyqa ttyqb ttyqc ttyqd ttyqe ttyqf \
eth klog random cmos rescue
eth klog random rescue
;;
0:|1:-\?)
cat >&2 <<EOF
@ -41,7 +41,6 @@ Where key is one of the following:
audio mixer # Make audio devices
klog # Make /dev/klog
random # Make /dev/random, /dev/urandom
cmos # Make /dev/cmos
kbd # Make /dev/kbd
kbdaux # Make /dev/kbdaux
rescue # Make /dev/rescue
@ -243,11 +242,6 @@ do
$e mknod urandom c 16 0; $e chmod 644 urandom
$e chgrp operator random urandom
;;
cmos)
# cmos device (set/get system time).
$e mknod cmos c 17 0
$e chmod 600 cmos
;;
rescue)
# rescue device
$e mknod rescue b 9 0

4
commands/scripts/Makefile
View file

@ -38,6 +38,7 @@ usr: \
/usr/bin/makewhatis \
/usr/bin/mkdep \
/usr/bin/mkdist \
/bin/readclock \
/bin/setup \
/usr/bin/binsizes \
/usr/bin/rotate \
@ -133,6 +134,9 @@ clean:
/usr/bin/rotate: rotate.sh
install -m 755 -c -o bin $? $@
/bin/readclock: readclock.sh
install -m 755 -c -o bin $? $@
/bin/setup: setup.sh
install -m 755 -c -o bin $? $@

5
commands/scripts/readclock.sh Normal file
View file

@ -0,0 +1,5 @@
#!/bin/sh
if [ $# -gt 0 ]
then ARGS="-args $@"
fi
/bin/service up /sbin/readclock.drv -config /etc/drivers.conf -script /etc/rs.single $ARGS

2
drivers/Makefile
View file

@ -25,8 +25,8 @@ all install depend clean:
cd ./dpeth && $(MAKE) $@
cd ./log && $(MAKE) $@
cd ./bios_wini && $(MAKE) $@
cd ./cmos && $(MAKE) $@
cd ./random && $(MAKE) $@
cd ./readclock && $(MAKE) $@
cd ./dp8390 && $(MAKE) $@
cd ./sb16 && $(MAKE) $@
cd ./lance && $(MAKE) $@

283
drivers/cmos/cmos.c
View file

@ -1,283 +0,0 @@
/* This file contains a device driver that can access the CMOS chip to
* get or set the system time. It drives the special file:
*
* /dev/cmos - CMOS chip
*
* Changes:
* Aug 04, 2005 Created. Read CMOS time. (Jorrit N. Herder)
*
* Manufacturers usually use the ID value of the IBM model they emulate.
* However some manufacturers, notably HP and COMPAQ, have had different
* ideas in the past.
*
* Machine ID byte information source:
* _The Programmer's PC Sourcebook_ by Thom Hogan,
* published by Microsoft Press
*/
#include "../drivers.h"
#include <sys/ioc_cmos.h>
#include <time.h>
#include <ibm/cmos.h>
#include <ibm/bios.h>
#include <minix/safecopies.h>
extern int errno; /* error number for PM calls */
FORWARD _PROTOTYPE( int gettime, (int who, int y2kflag, vir_bytes dst_time, int safe));
FORWARD _PROTOTYPE( void reply, (int reply, int replyee, int proc, cp_grant_id_t, int s));
FORWARD _PROTOTYPE( int read_register, (int register_address));
FORWARD _PROTOTYPE( int get_cmostime, (struct tm *tmp, int y2kflag));
FORWARD _PROTOTYPE( int dec_to_bcd, (int dec));
FORWARD _PROTOTYPE( int bcd_to_dec, (int bcd));
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC void main(void)
{
message m;
int y2kflag;
int result;
int suspended = NONE;
cp_grant_id_t susp_grant = GRANT_INVALID;
int s;
while(TRUE) {
int safe = 0;
/* Get work. */
if (OK != (s=receive(ANY, &m)))
panic("CMOS", "attempt to receive work failed", s);
/* Handle request. */
switch(m.m_type) {
case DEV_OPEN:
case DEV_CLOSE:
case CANCEL:
reply(TASK_REPLY, m.m_source, m.IO_ENDPT, GRANT_INVALID, OK);
break;
case DEV_PING:
notify(m.m_source);
break;
case DEV_IOCTL_S:
safe=1;
/* Fall through. */
case DEV_IOCTL:
/* Probably best to SUSPEND the caller, CMOS I/O has nasty timeouts.
* This way we don't block the rest of the system. First check if
* another process is already suspended. We cannot handle multiple
* requests at a time.
*/
if (suspended != NONE) {
reply(TASK_REPLY, m.m_source, m.IO_ENDPT, GRANT_INVALID, EBUSY);
break;
}
suspended = m.IO_ENDPT;
susp_grant = (cp_grant_id_t) m.IO_GRANT;
reply(TASK_REPLY, m.m_source, m.IO_ENDPT, susp_grant, SUSPEND);
switch(m.REQUEST) {
case CIOCGETTIME: /* get CMOS time */
case CIOCGETTIMEY2K:
y2kflag = (m.REQUEST == CIOCGETTIME) ? 0 : 1;
result = gettime(m.IO_ENDPT, y2kflag, (vir_bytes) m.ADDRESS, safe);
break;
case CIOCSETTIME:
case CIOCSETTIMEY2K:
default: /* unsupported ioctl */
result = ENOSYS;
}
/* Request completed. Tell the caller to check our status. */
notify(m.m_source);
break;
case DEV_STATUS:
/* The FS calls back to get our status. Revive the suspended
* processes and return the status of reading the CMOS.
*/
if (suspended == NONE)
reply(DEV_NO_STATUS, m.m_source, NONE, GRANT_INVALID, OK);
else
reply(DEV_REVIVE, m.m_source, suspended, susp_grant, result);
suspended = NONE;
break;
case SYN_ALARM: /* shouldn't happen */
case SYS_SIG: /* ignore system events */
continue;
default:
reply(TASK_REPLY, m.m_source, m.IO_ENDPT, GRANT_INVALID, EINVAL);
}
}
}
/*===========================================================================*
* reply *
*===========================================================================*/
PRIVATE void reply(int code, int replyee, int process, cp_grant_id_t grantid, int status)
{
message m;
int s;
m.m_type = code; /* TASK_REPLY or REVIVE */
m.REP_STATUS = status; /* result of device operation */
m.REP_ENDPT = process; /* which user made the request */
m.REP_IO_GRANT = grantid; /* I/O grant on which to unSUSPEND */
if (OK != (s=send(replyee, &m)))
panic("CMOS", "sending reply failed", s);
}
/*===========================================================================*
* gettime *
*===========================================================================*/
PRIVATE int gettime(int who, int y2kflag, vir_bytes dst_time, int safe)
{
unsigned char mach_id, cmos_state;
struct tm time1;
int i, s;
/* First obtain the machine ID to see if we can read the CMOS clock. Only
* for PS_386 and PC_AT this is possible. Otherwise, return an error.
*/
s = sys_readbios( MACHINE_ID_ADDR, &mach_id, MACHINE_ID_SIZE);
if (s != 0) {
printf("gettime: sys_readbios failed: %d\n", s);
return EINVAL;
}
if (mach_id != PS_386_MACHINE && mach_id != PC_AT_MACHINE) {
printf("gettime: machine ID unknown. ID byte = %02x.\n", mach_id);
return(EFAULT);
}
/* Now check the CMOS' state to see if we can read a proper time from it.
* If the state is crappy, return an error.
*/
cmos_state = read_register(CMOS_STATUS);
if (cmos_state & (CS_LOST_POWER | CS_BAD_CHKSUM | CS_BAD_TIME)) {
printf( "IS: CMOS RAM error(s) found. State = 0x%02x\n", cmos_state );
if (cmos_state & CS_LOST_POWER)
printf("IS: RTC lost power. Reset CMOS RAM with SETUP." );
if (cmos_state & CS_BAD_CHKSUM)
printf("IS: CMOS RAM checksum is bad. Run SETUP." );
if (cmos_state & CS_BAD_TIME)
printf("IS: Time invalid in CMOS RAM. Reset clock." );
return(EFAULT);
}
/* Everything seems to be OK. Read the CMOS real time clock and copy the
* result back to the caller.
*/
if (get_cmostime(&time1, y2kflag) != 0)
return(EFAULT);
/* Copy result back, safely or not. */
if(safe) {
sys_safecopyto(who, dst_time, 0, (vir_bytes) &time1,
sizeof(struct tm), D);
} else {
sys_datacopy(SELF, (vir_bytes) &time1,
who, dst_time, sizeof(struct tm));
}
return(OK);
}
PRIVATE int get_cmostime(struct tm *t, int y2kflag)
{
/* Update the structure pointed to by time with the current time as read
* from CMOS RAM of the RTC. If necessary, the time is converted into a
* binary format before being stored in the structure.
*/
int osec, n;
unsigned long i;
clock_t t0,t1;
/* Start a timer to keep us from getting stuck on a dead clock. */
getuptime(&t0);
do {
osec = -1;
n = 0;
do {
getuptime(&t1);
if (t1-t0 > 5*HZ) {
printf("readclock: CMOS clock appears dead\n");
return(1);
}
/* Clock update in progress? */
if (read_register(RTC_REG_A) & RTC_A_UIP) continue;
t->tm_sec = read_register(RTC_SEC);
if (t->tm_sec != osec) {
/* Seconds changed. First from -1, then because the
* clock ticked, which is what we're waiting for to
* get a precise reading.
*/
osec = t->tm_sec;
n++;
}
} while (n < 2);
/* Read the other registers. */
t->tm_min = read_register(RTC_MIN);
t->tm_hour = read_register(RTC_HOUR);
t->tm_mday = read_register(RTC_MDAY);
t->tm_mon = read_register(RTC_MONTH);
t->tm_year = read_register(RTC_YEAR);
/* Time stable? */
} while (read_register(RTC_SEC) != t->tm_sec
|| read_register(RTC_MIN) != t->tm_min
|| read_register(RTC_HOUR) != t->tm_hour
|| read_register(RTC_MDAY) != t->tm_mday
|| read_register(RTC_MONTH) != t->tm_mon
|| read_register(RTC_YEAR) != t->tm_year);
if ((read_register(RTC_REG_B) & RTC_B_DM_BCD) == 0) {
/* Convert BCD to binary (default RTC mode). */
t->tm_year = bcd_to_dec(t->tm_year);
t->tm_mon = bcd_to_dec(t->tm_mon);
t->tm_mday = bcd_to_dec(t->tm_mday);
t->tm_hour = bcd_to_dec(t->tm_hour);
t->tm_min = bcd_to_dec(t->tm_min);
t->tm_sec = bcd_to_dec(t->tm_sec);
}
t->tm_mon--; /* Counts from 0. */
/* Correct the year, good until 2080. */
if (t->tm_year < 80) t->tm_year += 100;
if (y2kflag) {
/* Clock with Y2K bug, interpret 1980 as 2000, good until 2020. */
if (t->tm_year < 100) t->tm_year += 20;
}
return 0;
}
PRIVATE int read_register(int reg_addr)
{
/* Read a single CMOS register value. */
unsigned long r;
sys_outb(RTC_INDEX, reg_addr);
sys_inb(RTC_IO, &r);
return r;
}
PRIVATE int bcd_to_dec(int n)
{
return ((n >> 4) & 0x0F) * 10 + (n & 0x0F);
}
PRIVATE int dec_to_bcd(int n)
{
return ((n / 10) << 4) | (n % 10);
}

25
drivers/cmos/Makefile → drivers/readclock/Makefile
View file

@ -1,25 +1,17 @@
# Makefile for the CMOS driver
DRIVER = cmos
# directories
u = /usr
i = $u/include
s = $i/sys
m = $i/minix
b = $i/ibm
d = ..
# Makefile for readclock 'driver'
DRIVER = readclock.drv
# programs, flags, etc.
MAKE = exec make
CC = exec cc
CFLAGS = -I$i $(CPROFILE)
LDFLAGS = -i -L../libdriver
LIBS = -lsysutil -lsys -ldriver
CFLAGS=-D_MINIX=1 -D_POSIX_SOURCE=1 -D_SYSTEM=1
LDFLAGS = -i
LIBS = -lsysutil -lsys
OBJ = cmos.o
OBJ = readclock.o
# build local binary
all build: $(DRIVER)
all build: $(DRIVER)
$(DRIVER): $(OBJ)
$(CC) -o $@ $(LDFLAGS) $(OBJ) $(LIBS)
install -S 8k $(DRIVER)
@ -33,9 +25,8 @@ install: /sbin/$(DRIVER)
clean:
rm -f $(DRIVER) *.o *.bak
depend:
/usr/bin/mkdep "$(CC) -E $(CPPFLAGS)" *.c ../libdriver/*.c > .depend
/usr/bin/mkdep "$(CC) -E $(CPPFLAGS)" *.c > .depend
# Include generated dependencies.
include .depend

412
drivers/readclock/readclock.c Normal file
View file

@ -0,0 +1,412 @@
/* readclock - read the real time clock Authors: T. Holm & E. Froese
*
* Changed to be user-space driver.
*/
/************************************************************************/
/* */
/* readclock.c */
/* */
/* Read the clock value from the 64 byte CMOS RAM */
/* area, then set system time. */
/* */
/* If the machine ID byte is 0xFC or 0xF8, the device */
/* /dev/mem exists and can be opened for reading, */
/* and no errors in the CMOS RAM are reported by the */
/* RTC, then the time is read from the clock RAM */
/* area maintained by the RTC. */
/* */
/* The clock RAM values are decoded and fed to mktime */
/* to make a time_t value, then stime(2) is called. */
/* */
/* This fails if: */
/* */
/* If the machine ID does not match 0xFC or 0xF8 (no */
/* error message.) */
/* */
/* If the machine ID is 0xFC or 0xF8 and /dev/mem */
/* is missing, or cannot be accessed. */
/* */
/* If the RTC reports errors in the CMOS RAM. */
/* */
/************************************************************************/
/* origination 1987-Dec-29 efth */
/* robustness 1990-Oct-06 C. Sylvain */
/* incorp. B. Evans ideas 1991-Jul-06 C. Sylvain */
/* set time & calibrate 1992-Dec-17 Kees J. Bot */
/* clock timezone 1993-Oct-10 Kees J. Bot */
/* set CMOS clock 1994-Jun-12 Kees J. Bot */
/************************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <signal.h>
#include <minix/type.h>
#include <minix/syslib.h>
#include <minix/com.h>
#include <minix/portio.h>
#include <ibm/cmos.h>
#include <sys/svrctl.h>
int nflag = 0; /* Tell what, but don't do it. */
int wflag = 0; /* Set the CMOS clock. */
int Wflag = 0; /* Also set the CMOS clock register bits. */
int y2kflag = 0; /* Interpret 1980 as 2000 for clock with Y2K bug. */
char clocktz[128]; /* Timezone of the clock. */
#define MACH_ID_ADDR 0xFFFFE /* BIOS Machine ID at FFFF:000E */
#define PC_AT 0xFC /* Machine ID byte for PC/AT,
PC/XT286, and PS/2 Models 50, 60 */
#define PS_386 0xF8 /* Machine ID byte for PS/2 Model 80 */
/* Manufacturers usually use the ID value of the IBM model they emulate.
* However some manufacturers, notably HP and COMPAQ, have had different
* ideas in the past.
*
* Machine ID byte information source:
* _The Programmer's PC Sourcebook_ by Thom Hogan,
* published by Microsoft Press
*/
void errmsg(char *s);
void get_time(struct tm *t);
int read_register(int reg_addr);
void set_time(struct tm *t);
void write_register(int reg_addr, int value);
int bcd_to_dec(int n);
int dec_to_bcd(int n);
void usage(void);
int main(int argc, char **argv)
{
struct tm time1;
struct tm time2;
struct tm tmnow;
char date[64];
time_t now, rtc;
int i, s;
unsigned char mach_id, cmos_state;
struct sysgetenv sysgetenv;
if((s=sys_readbios(MACH_ID_ADDR, &mach_id, sizeof(mach_id))) != OK) {
printf("readclock: sys_readbios failed: %d.\n", s);
exit(1);
}
if (mach_id != PS_386 && mach_id != PC_AT) {
errmsg("Machine ID unknown." );
printf("Machine ID byte = %02x\n", mach_id );
exit(1);
}
cmos_state = read_register(CMOS_STATUS);
if (cmos_state & (CS_LOST_POWER | CS_BAD_CHKSUM | CS_BAD_TIME)) {
errmsg( "CMOS RAM error(s) found..." );
printf("CMOS state = 0x%02x\n", cmos_state );
if (cmos_state & CS_LOST_POWER)
errmsg( "RTC lost power. Reset CMOS RAM with SETUP." );
if (cmos_state & CS_BAD_CHKSUM)
errmsg( "CMOS RAM checksum is bad. Run SETUP." );
if (cmos_state & CS_BAD_TIME)
errmsg( "Time invalid in CMOS RAM. Reset clock." );
exit(1);
}
/* Process options. */
while (argc > 1) {
char *p = *++argv;
if (*p++ != '-') usage();
while (*p != 0) {
switch (*p++) {
case 'n': nflag = 1; break;
case 'w': wflag = 1; break;
case 'W': Wflag = 1; break;
case '2': y2kflag = 1; break;
default: usage();
}
}
argc--;
}
if (Wflag) wflag = 1; /* -W implies -w */
#if 0
/* The hardware clock may run in a different time zone, likely GMT or
* winter time. Select that time zone.
*/
strcpy(clocktz, "TZ=");
sysgetenv.key = "TZ";
sysgetenv.keylen = 2+1;
sysgetenv.val = clocktz+3;
sysgetenv.vallen = sizeof(clocktz)-3;
if (svrctl(SYSGETENV, &sysgetenv) == 0) {
putenv(clocktz);
tzset();
}
#endif
/* Read the CMOS real time clock. */
for (i = 0; i < 10; i++) {
get_time(&time1);
now = time(NULL);
time1.tm_isdst = -1; /* Do timezone calculations. */
time2 = time1;
rtc= mktime(&time1); /* Transform to a time_t. */
if (rtc != -1) break;
printf(
"readclock: Invalid time read from CMOS RTC: %d-%02d-%02d %02d:%02d:%02d\n",
time2.tm_year+1900, time2.tm_mon+1, time2.tm_mday,
time2.tm_hour, time2.tm_min, time2.tm_sec);
sleep(5);
}
if (i == 10) exit(1);
if (!wflag) {
/* Set system time. */
if (nflag) {
printf("stime(%lu)\n", (unsigned long) rtc);
} else {
if (stime(&rtc) < 0) {
errmsg( "Not allowed to set time." );
exit(1);
}
}
tmnow = *localtime(&rtc);
if (strftime(date, sizeof(date),
"%a %b %d %H:%M:%S %Z %Y", &tmnow) != 0) {
if (date[8] == '0') date[8]= ' ';
printf("%s\n", date);
}
} else {
/* Set the CMOS clock to the system time. */
tmnow = *localtime(&now);
if (nflag) {
printf("%04d-%02d-%02d %02d:%02d:%02d\n",
tmnow.tm_year + 1900,
tmnow.tm_mon + 1,
tmnow.tm_mday,
tmnow.tm_hour,
tmnow.tm_min,
tmnow.tm_sec);
} else {
set_time(&tmnow);
}
}
exit(0);
}
void errmsg(char *s)
{
static char *prompt = "readclock: ";
printf("%s%s\n", prompt, s);
prompt = "";
}
/***********************************************************************/
/* */
/* get_time( time ) */
/* */
/* Update the structure pointed to by time with the current time */
/* as read from CMOS RAM of the RTC. */
/* If necessary, the time is converted into a binary format before */
/* being stored in the structure. */
/* */
/***********************************************************************/
int dead;
void timeout(int sig) { dead= 1; }
void get_time(struct tm *t)
{
int osec, n;
unsigned long i;
struct sigaction sa;
/* Start a timer to keep us from getting stuck on a dead clock. */
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = timeout;
sigaction(SIGALRM, &sa, NULL);
dead = 0;
alarm(5);
do {
osec = -1;
n = 0;
do {
if (dead) {
printf("readclock: CMOS clock appears dead\n");
exit(1);
}
/* Clock update in progress? */
if (read_register(RTC_REG_A) & RTC_A_UIP) continue;
t->tm_sec = read_register(RTC_SEC);
if (t->tm_sec != osec) {
/* Seconds changed. First from -1, then because the
* clock ticked, which is what we're waiting for to
* get a precise reading.
*/
osec = t->tm_sec;
n++;
}
} while (n < 2);
/* Read the other registers. */
t->tm_min = read_register(RTC_MIN);
t->tm_hour = read_register(RTC_HOUR);
t->tm_mday = read_register(RTC_MDAY);
t->tm_mon = read_register(RTC_MONTH);
t->tm_year = read_register(RTC_YEAR);
/* Time stable? */
} while (read_register(RTC_SEC) != t->tm_sec
|| read_register(RTC_MIN) != t->tm_min
|| read_register(RTC_HOUR) != t->tm_hour
|| read_register(RTC_MDAY) != t->tm_mday
|| read_register(RTC_MONTH) != t->tm_mon
|| read_register(RTC_YEAR) != t->tm_year);
if ((read_register(RTC_REG_B) & RTC_B_DM_BCD) == 0) {
/* Convert BCD to binary (default RTC mode). */
t->tm_year = bcd_to_dec(t->tm_year);
t->tm_mon = bcd_to_dec(t->tm_mon);
t->tm_mday = bcd_to_dec(t->tm_mday);
t->tm_hour = bcd_to_dec(t->tm_hour);
t->tm_min = bcd_to_dec(t->tm_min);
t->tm_sec = bcd_to_dec(t->tm_sec);
}
t->tm_mon--; /* Counts from 0. */
/* Correct the year, good until 2080. */
if (t->tm_year < 80) t->tm_year += 100;
if (y2kflag) {
/* Clock with Y2K bug, interpret 1980 as 2000, good until 2020. */
if (t->tm_year < 100) t->tm_year += 20;
}
}
int read_register(int reg_addr)
{
u32_t r;
if(sys_outb(RTC_INDEX, reg_addr) != OK) {
printf("cmos: outb failed of %x\n", RTC_INDEX);
exit(1);
}
if(sys_inb(RTC_IO, &r) != OK) {
printf("cmos: inb failed of %x (index %x) failed\n", RTC_IO, reg_addr);
exit(1);
}
return r;
}
/***********************************************************************/
/* */
/* set_time( time ) */
/* */
/* Set the CMOS RTC to the time found in the structure. */
/* */
/***********************************************************************/
void set_time(struct tm *t)
{
int regA, regB;
if (Wflag) {
/* Set A and B registers to their proper values according to the AT
* reference manual. (For if it gets messed up, but the BIOS doesn't
* repair it.)
*/
write_register(RTC_REG_A, RTC_A_DV_OK | RTC_A_RS_DEF);
write_register(RTC_REG_B, RTC_B_24);
}
/* Inhibit updates. */
regB= read_register(RTC_REG_B);
write_register(RTC_REG_B, regB | RTC_B_SET);
t->tm_mon++; /* Counts from 1. */
if (y2kflag) {
/* Set the clock back 20 years to avoid Y2K bug, good until 2020. */
if (t->tm_year >= 100) t->tm_year -= 20;
}
if ((regB & 0x04) == 0) {
/* Convert binary to BCD (default RTC mode) */
t->tm_year = dec_to_bcd(t->tm_year % 100);
t->tm_mon = dec_to_bcd(t->tm_mon);
t->tm_mday = dec_to_bcd(t->tm_mday);
t->tm_hour = dec_to_bcd(t->tm_hour);
t->tm_min = dec_to_bcd(t->tm_min);
t->tm_sec = dec_to_bcd(t->tm_sec);
}
write_register(RTC_YEAR, t->tm_year);
write_register(RTC_MONTH, t->tm_mon);
write_register(RTC_MDAY, t->tm_mday);
write_register(RTC_HOUR, t->tm_hour);
write_register(RTC_MIN, t->tm_min);
write_register(RTC_SEC, t->tm_sec);
/* Stop the clock. */
regA= read_register(RTC_REG_A);
write_register(RTC_REG_A, regA | RTC_A_DV_STOP);
/* Allow updates and restart the clock. */
write_register(RTC_REG_B, regB);
write_register(RTC_REG_A, regA);
}
void write_register(int reg_addr, int value)
{
if(sys_outb(RTC_INDEX, reg_addr) != OK) {
printf("cmos: outb failed of %x\n", RTC_INDEX);
exit(1);
}
if(sys_outb(RTC_IO, value) != OK) {
printf("cmos: outb failed of %x (index %x)\n", RTC_IO, reg_addr);
exit(1);
}
}
int bcd_to_dec(int n)
{
return ((n >> 4) & 0x0F) * 10 + (n & 0x0F);
}
int dec_to_bcd(int n)
{
return ((n / 10) << 4) | (n % 10);
}
void usage(void)
{
printf("Usage: readclock [-nwW2]\n");
exit(1);
}

2
etc/Makefile
View file

@ -1,7 +1,7 @@
ETC=/etc/
USRETC=/usr/etc/
FILES1=fstab group hostname.file inet.conf motd.install mtab passwd profile protocols rc services termcap ttytab utmp rc.cd binary_sizes binary_sizes.big binary_sizes.xxl rc.rescue syslog.conf rc.daemons.dist rs.single make.conf
FILES1=fstab group hostname.file inet.conf motd.install mtab passwd profile protocols rc services termcap ttytab utmp rc.cd binary_sizes binary_sizes.big binary_sizes.xxl rc.rescue syslog.conf rc.daemons.dist rs.single make.conf drivers.conf
FILES2=shadow
FILES3=daily dhcptags.conf rc

4
etc/drivers.conf
View file

@ -73,16 +73,18 @@ driver random
;
};
driver cmos
driver readclock.drv
{
io 70:2;
system
DEVIO # 21
TIMES # 25
SAFECOPYTO # 32
SAFECOPYFROM # 32
SETGRANT # 34
READBIOS # 35
;
uid 0;
};
driver is

1
etc/rc
View file

@ -49,7 +49,6 @@ start)
test -f /etc/keymap && loadkeys /etc/keymap
up is -period 5HZ
up cmos -dev /dev/cmos -period 5HZ
echo .
# Set timezone.