FreeBSD/Linux Kernel Cross Reference
sys/kernel/config.h

     #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_LOCK_CHECK   0    /* kernel lock() sanity check */
    #define DEBUG_TIME_LOCKS   0    /* measure time spent in locks */
    
    #endif /* CONFIG_H */
    

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