source: trunk/minix/kernel/config.h@ 20

#ifndef CONFIG_H
#define CONFIG_H

/* This file defines the kernel configuration. It allows to set sizes of some
 * kernel buffers and to enable or disable debugging code, timing features, 
 * and individual kernel calls.
 *
 * Changes:
 *   Jul 11, 2005       Created.  (Jorrit N. Herder)
 */

/* In embedded and sensor applications, not all the kernel calls may be
 * needed. In this section you can specify which kernel calls are needed
 * and which are not. The code for unneeded kernel calls is not included in
 * the system binary, making it smaller. If you are not sure, it is best
 * to keep all kernel calls enabled.
 */
#define USE_FORK           1    /* fork a new process */
#define USE_NEWMAP         1    /* set a new memory map */
#define USE_EXEC           1    /* update process after execute */
#define USE_EXIT           1    /* clean up after process exit */
#define USE_TRACE          1    /* process information and tracing */
#define USE_GETKSIG        1    /* retrieve pending kernel signals */
#define USE_ENDKSIG        1    /* finish pending kernel signals */
#define USE_KILL           1    /* send a signal to a process */
#define USE_SIGSEND        1    /* send POSIX-style signal */
#define USE_SIGRETURN      1    /* sys_sigreturn(proc_nr, ctxt_ptr, flags) */
#define USE_ABORT          1    /* shut down MINIX */
#define USE_GETINFO        1    /* retrieve a copy of kernel data */
#define USE_TIMES          1    /* get process and system time info */
#define USE_SETALARM       1    /* schedule a synchronous alarm */
#define USE_DEVIO          1    /* read or write a single I/O port */
#define USE_VDEVIO         1    /* process vector with I/O requests */
#define USE_SDEVIO         1    /* perform I/O request on a buffer */
#define USE_IRQCTL         1    /* set an interrupt policy */
#define USE_SEGCTL         1    /* set up a remote segment */
#define USE_PRIVCTL        1    /* system privileges control */
#define USE_NICE           1    /* change scheduling priority */
#define USE_UMAP           1    /* map virtual to physical address */
#define USE_VIRCOPY        1    /* copy using virtual addressing */ 
#define USE_VIRVCOPY       1    /* vector with virtual copy requests */
#define USE_PHYSCOPY       1    /* copy using physical addressing */
#define USE_PHYSVCOPY      1    /* vector with physical copy requests */
#define USE_MEMSET         1    /* write char to a given memory area */

/* Length of program names stored in the process table. This is only used
 * for the debugging dumps that can be generated with the IS server. The PM
 * server keeps its own copy of the program name.  
 */
#define P_NAME_LEN         8

/* Kernel diagnostics are written to a circular buffer. After each message, 
 * a system server is notified and a copy of the buffer can be retrieved to 
 * display the message. The buffers size can safely be reduced.  
 */
#define KMESS_BUF_SIZE   256    

/* Buffer to gather randomness. This is used to generate a random stream by 
 * the MEMORY driver when reading from /dev/random. 
 */
#define RANDOM_ELEMENTS   32

/* This section contains defines for valuable system resources that are used
 * by device drivers. The number of elements of the vectors is determined by 
 * the maximum needed by any given driver. The number of interrupt hooks may
 * be incremented on systems with many device drivers. 
 */
#define NR_IRQ_HOOKS      16            /* number of interrupt hooks */
#define VDEVIO_BUF_SIZE   64            /* max elements per VDEVIO request */
#define VCOPY_VEC_SIZE    16            /* max elements per VCOPY request */

/* How many bytes for the kernel stack. Space allocated in mpx.s. */
#define K_STACK_BYTES   1024    

/* This section allows to enable kernel debugging and timing functionality.
 * For normal operation all options should be disabled.
 */
#define DEBUG_SCHED_CHECK  0    /* sanity check of scheduling queues */
#define DEBUG_TIME_LOCKS   0    /* measure time spent in locks */

#endif /* CONFIG_H */