text: #ifndef _PARAM_H_
  #define _PARAM_H_
  
  // System parameters
  
  #define NPROC        64  // maximum number of processes
  #define KSTACKSIZE 4096  // size of per-process kernel stack
  #define NCPU          8  // maximum number of CPUs
  #define NOFILE       16  // open files per process
  #define NFILE       100  // open files per system
  #define NBUF         10  // size of disk block cache
  #define NINODE       50  // maximum number of active i-nodes
  #define NDEV         10  // maximum major device number
  #define ROOTDEV       1  // device number of file system root disk
  #define USERTOP  0xA0000 // end of user address space 16580412
  #define SHMEMBOTTOM 0x9c000 // the bottom the the shared mem in user memory
  #define PHYSTOP  0x1000000 // use phys mem up to here as free pool
  #define MAXARG       32  // max exec arguments
  
  #endif // _PARAM_H_
  