kernel/utility.c

   1 /* This file contains a collection of miscellaneous procedures:
   2  *   minix_panic:    abort MINIX due to a fatal error
   3  *   kprintf:       (from lib/sysutil/kprintf.c)
   4  *   kputc:         buffered putc used by kernel kprintf
   5  */
   6
   7 #include "kernel.h"
   8 #include "proc.h"
   9
  10 #include <unistd.h>
  11 #include <signal.h>
  12 #include <string.h>
  13
  14 #include <minix/sysutil.h>
  15 #include <minix/sys_config.h>
  16
  17 /*===========================================================================*
  18  *                      panic                                        *
  19  *===========================================================================*/
  20 PUBLIC void panic(what, mess,nr)
  21 char *what;
  22 char *mess;
  23 int nr;
  24 {
  25 /* This function is for when a library call wants to panic.
  26  * The library call calls printf() and tries to exit a process,
  27  * which isn't applicable in the kernel.
  28  */
  29         minix_panic(mess, nr);
  30 }
  31
  32 /*===========================================================================*
  33  *                      minix_panic                                        *
  34  *===========================================================================*/
  35 PUBLIC void minix_panic(mess,nr)
  36 char *mess;
  37 int nr;
  38 {
  39 /* The system has run aground of a fatal kernel error. Terminate execution. */
  40 if (minix_panicing++) {
  41         arch_monitor();
  42 }
  43
  44   if (mess != NULL) {
  45         kprintf("kernel panic: %s", mess);
  46         if(nr != NO_NUM)
  47                 kprintf(" %d", nr);
  48         kprintf("\n");
  49   }
  50
  51   kprintf("kernel: ");
  52   util_stacktrace();
  53
  54   /* Abort MINIX. */
  55   minix_shutdown(NULL);
  56 }
  57
  58
  59 /* Include system printf() implementation named kprintf() */
  60
  61 #define printf kprintf
  62 #include "../lib/sysutil/kprintf.c"
  63
  64 /*===========================================================================*
  65  *                              kputc                                        *
  66  *===========================================================================*/
  67 PUBLIC void kputc(c)
  68 int c;                                  /* character to append */
  69 {
  70 /* Accumulate a single character for a kernel message. Send a notification
  71  * to the output driver if an END_OF_KMESS is encountered.
  72  */
  73   if (c != END_OF_KMESS) {
  74       if (do_serial_debug) {
  75         if(c == '\n')
  76                 ser_putc('\r');
  77         ser_putc(c);
  78       }
  79       kmess.km_buf[kmess.km_next] = c;  /* put normal char in buffer */
  80       if (kmess.km_size < sizeof(kmess.km_buf))
  81           kmess.km_size += 1;
  82       kmess.km_next = (kmess.km_next + 1) % _KMESS_BUF_SIZE;
  83   } else {
  84       int p, outprocs[] = OUTPUT_PROCS_ARRAY;
  85       if(!(minix_panicing || do_serial_debug)) {
  86               for(p = 0; outprocs[p] != NONE; p++) {
  87                  if(isokprocn(outprocs[p]) && !isemptyn(outprocs[p])) {
  88             send_sig(outprocs[p], SIGKMESS);
  89                  }
  90         }
  91      }
  92   }
  93   return;
  94 }