minix/kernel/utility.c

/* This file contains a collection of miscellaneous procedures:
 *   panic:	    abort MINIX due to a fatal error
 */

#include "kernel.h"
#include <unistd.h>

/*===========================================================================*
 *				panic                                        *
 *===========================================================================*/
PUBLIC void panic(mess,nr)
_CONST char *mess;
int nr;
{
/* The system has run aground of a fatal kernel error. Terminate execution. */
  static int panicking = 0;
  if (panicking ++) return;		/* prevent recursive panics */

  if (mess != NULL) {
	kprintf("\nKernel panic: %s", mess);
	if (nr != NO_NUM) kprintf(" %d", nr);
	kprintf("\n",NO_NUM);
  }

  /* Abort MINIX. */
  prepare_shutdown(RBT_PANIC);
}
Initial revision 2005-04-21 16:53:53 +02:00			`/* This file contains a collection of miscellaneous procedures:`
Miscellaneous clean ups and fixes to the kernel. Support for FLOPPY in boot image. (Set controller=fd at boot monitor.) Moved major device numbers to <minix/dmap.h> (maybe rename to dev.h?) 2005-08-04 11:26:36 +02:00			`* panic: abort MINIX due to a fatal error`
Initial revision 2005-04-21 16:53:53 +02:00			`*/`

			`#include "kernel.h"`
			`#include <unistd.h>`

			`/===========================================================================`
Andy's formatting fixes. 2005-09-11 18:44:06 +02:00			`* panic *`
Initial revision 2005-04-21 16:53:53 +02:00			`===========================================================================/`
Various fixes and improvements. - fixed bug that caused IDLE to panic (irq hook inconsistency); - kprintf() now accepts multiple arguments; moved to utility.c; - prepare_shutdown() signals system processes with SIGKSTOP; - phys_fill() renamed to phys_memset(), argument order changed; - kmemset() removed in favor of phys_kmemset(); - kstrncpy() removed in favor of phys_copy(); - katoi, kstrncmp replaced by normal library procedure again; - rm_irq_handler() interface changed (simply pass hook pointer); 2005-07-20 17:25:38 +02:00			`PUBLIC void panic(mess,nr)`
			`_CONST char *mess;`
			`int nr;`
Initial revision 2005-04-21 16:53:53 +02:00			`{`
Kernel cleanup. Reduced kernel size by 512KB by moving private buffer into cstart() function. Replaced assertions with erroneous return values. Removed assertions relating to isuserp(rp), since all processes should become user processes; system processes are now treated similar to other processes. 2005-06-07 14:34:25 +02:00			`/* The system has run aground of a fatal kernel error. Terminate execution. */`
Initial revision 2005-04-21 16:53:53 +02:00			`static int panicking = 0;`
System processes can be signaled; signals are transformed in SYS_EVENT message that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice. 2005-07-19 14:21:36 +02:00			`if (panicking ++) return; /* prevent recursive panics */`
Initial revision 2005-04-21 16:53:53 +02:00
Various fixes and improvements. - fixed bug that caused IDLE to panic (irq hook inconsistency); - kprintf() now accepts multiple arguments; moved to utility.c; - prepare_shutdown() signals system processes with SIGKSTOP; - phys_fill() renamed to phys_memset(), argument order changed; - kmemset() removed in favor of phys_kmemset(); - kstrncpy() removed in favor of phys_copy(); - katoi, kstrncmp replaced by normal library procedure again; - rm_irq_handler() interface changed (simply pass hook pointer); 2005-07-20 17:25:38 +02:00			`if (mess != NULL) {`
			`kprintf("\nKernel panic: %s", mess);`
			`if (nr != NO_NUM) kprintf(" %d", nr);`
* Fixed bug relating to nested locking in interrupt handlers. The nested lock caused interrupts to be reenabled (due to unlock), which caused a race. The problems were especially visible on slower machines. * Relocated free memory parsing to process manager. This saved quite some code at the kernel level. Text size was reduced by about 650 bytes. * Removed locks for updating the realtime in the clock's main loop and the get_uptime function. Interrupts are no longer reentrant, so realtime is immediately updated. 2005-06-17 11:09:54 +02:00			`kprintf("\n",NO_NUM);`
Initial revision 2005-04-21 16:53:53 +02:00			`}`
- Fixed comments in various system call handlers. Work in progress on new sys_privctl() call to dynamically start servers and drivers. - Shutdown sequence slightly adjusted: called as watchdog timer to let the busy sys_abort() call from the PM return first. - Changed umap_bios() to have more restrictive check: BIOS memory is now allowed in BIOS_MEM_BEGIN to END (interrupt vectors) and BASE_MEM_TOP to UPPER_MEM_END. Hopefully this keeps QEMU and Bochs happy. 2005-07-21 20:36:40 +02:00
AT driver is not modified (debugging only); TTY: select and revive with new notify and FS call back; kernel: removed old notify code; removed ugly prepare_shutdown timer kputc: don't send to FS if PRINTF_PROC fails 2005-07-27 16:32:16 +02:00			`/* Abort MINIX. */`
			`prepare_shutdown(RBT_PANIC);`
Initial revision 2005-04-21 16:53:53 +02:00			`}`