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