FreeBSD/Linux Kernel Cross Reference
sys/include/minix/const.h

     /* Copyright (C) 2001 by Prentice-Hall, Inc.  See the copyright notice in
      * the file /usr/src/LICENSE.
      */
     
     #ifndef CHIP
     #error CHIP is not defined
     #endif
     
     #define EXTERN        extern    /* used in *.h files */
    #define PRIVATE       static    /* PRIVATE x limits the scope of x */
    #define PUBLIC                  /* PUBLIC is the opposite of PRIVATE */
    #define FORWARD       static    /* some compilers require this to be 'static'*/
    
    #define TRUE               1    /* used for turning integers into Booleans */
    #define FALSE              0    /* used for turning integers into Booleans */
    
    #define HZ                60    /* clock freq (software settable on IBM-PC) */
    
    #define SUPER_USER (uid_t) 0    /* uid_t of superuser */
    
    /* Devices. */
    #define MAJOR              8    /* major device = (dev>>MAJOR) & 0377 */
    #define MINOR              0    /* minor device = (dev>>MINOR) & 0377 */
    
    #define NULL     ((void *)0)    /* null pointer */
    #define CPVEC_NR          16    /* max # of entries in a SYS_VCOPY request */
    #define CPVVEC_NR         64    /* max # of entries in a SYS_VCOPY request */
    #define NR_IOREQS       MIN(NR_BUFS, 64)
                                    /* maximum number of entries in an iorequest */
    
    /* Message passing constants. */
    #define MESS_SIZE (sizeof(message))     /* might need usizeof from FS here */
    #define NIL_MESS ((message *) 0)        /* null pointer */
    
    /* Memory related constants. */
    #define SEGMENT_TYPE  0xFF00    /* bit mask to get segment type */
    #define SEGMENT_INDEX 0x00FF    /* bit mask to get segment index */
    
    #define LOCAL_SEG     0x0000    /* flags indicating local memory segment */
    #define NR_LOCAL_SEGS      3    /* # local segments per process (fixed) */
    #define T                  0    /* proc[i].mem_map[T] is for text */
    #define D                  1    /* proc[i].mem_map[D] is for data */
    #define S                  2    /* proc[i].mem_map[S] is for stack */
    
    #define REMOTE_SEG    0x0100    /* flags indicating remote memory segment */
    #define NR_REMOTE_SEGS     3    /* # remote memory regions (variable) */
    
    #define BIOS_SEG      0x0200    /* flags indicating BIOS memory segment */
    #define NR_BIOS_SEGS       3    /* # BIOS memory regions (variable) */
    
    #define PHYS_SEG      0x0400    /* flag indicating entire physical memory */
    
    /* Labels used to disable code sections for different reasons. */
    #define DEAD_CODE          0    /* unused code in normal configuration */
    #define FUTURE_CODE        0    /* new code to be activated + tested later */
    #define TEMP_CODE          1    /* active code to be removed later */
    
    /* Process name length in the PM process table, including '\0'. */
    #define PROC_NAME_LEN   16
    
    /* Miscellaneous */
    #define BYTE            0377    /* mask for 8 bits */
    #define READING            0    /* copy data to user */
    #define WRITING            1    /* copy data from user */
    #define NO_NUM        0x8000    /* used as numerical argument to panic() */
    #define NIL_PTR   (char *) 0    /* generally useful expression */
    #define HAVE_SCATTERED_IO  1    /* scattered I/O is now standard */
    
    /* Macros. */
    #define MAX(a, b)   ((a) > (b) ? (a) : (b))
    #define MIN(a, b)   ((a) < (b) ? (a) : (b))
    
    /* Memory is allocated in clicks. */
    #if (CHIP == INTEL)
    #define CLICK_SIZE      4096    /* unit in which memory is allocated */
    #define CLICK_SHIFT       12    /* log2 of CLICK_SIZE */
    #endif
    
    #if (CHIP == SPARC) || (CHIP == M68000)
    #define CLICK_SIZE      4096    /* unit in which memory is allocated */
    #define CLICK_SHIFT       12    /* log2 of CLICK_SIZE */
    #endif
    
    /* Click to byte conversions (and vice versa). */
    #define HCLICK_SHIFT       4    /* log2 of HCLICK_SIZE */
    #define HCLICK_SIZE       16    /* hardware segment conversion magic */
    #if CLICK_SIZE >= HCLICK_SIZE
    #define click_to_hclick(n) ((n) << (CLICK_SHIFT - HCLICK_SHIFT))
    #else
    #define click_to_hclick(n) ((n) >> (HCLICK_SHIFT - CLICK_SHIFT))
    #endif
    #define hclick_to_physb(n) ((phys_bytes) (n) << HCLICK_SHIFT)
    #define physb_to_hclick(n) ((n) >> HCLICK_SHIFT)
    
    #define ABS             -999    /* this process means absolute memory */
    
    /* Flag bits for i_mode in the inode. */
    #define I_TYPE          0170000 /* this field gives inode type */
    #define I_REGULAR       0100000 /* regular file, not dir or special */
   #define I_BLOCK_SPECIAL 0060000 /* block special file */
   #define I_DIRECTORY     0040000 /* file is a directory */
   #define I_CHAR_SPECIAL  0020000 /* character special file */
   #define I_NAMED_PIPE    0010000 /* named pipe (FIFO) */
   #define I_SET_UID_BIT   0004000 /* set effective uid_t on exec */
   #define I_SET_GID_BIT   0002000 /* set effective gid_t on exec */
   #define ALL_MODES       0006777 /* all bits for user, group and others */
   #define RWX_MODES       0000777 /* mode bits for RWX only */
   #define R_BIT           0000004 /* Rwx protection bit */
   #define W_BIT           0000002 /* rWx protection bit */
   #define X_BIT           0000001 /* rwX protection bit */
   #define I_NOT_ALLOC     0000000 /* this inode is free */
   
   /* Flag used only in flags argument of dev_open. */
   #define RO_BIT          0200000 /* Open device readonly; fail if writable. */
   
   /* Some limits. */
   #define MAX_BLOCK_NR  ((block_t) 077777777)     /* largest block number */
   #define HIGHEST_ZONE   ((zone_t) 077777777)     /* largest zone number */
   #define MAX_INODE_NR ((ino_t) 037777777777)     /* largest inode number */
   #define MAX_FILE_POS ((off_t) 037777777777)     /* largest legal file offset */
   
   #define NO_BLOCK              ((block_t) 0)     /* absence of a block number */
   #define NO_ENTRY                ((ino_t) 0)     /* absence of a dir entry */
   #define NO_ZONE                ((zone_t) 0)     /* absence of a zone number */
   #define NO_DEV                  ((dev_t) 0)     /* absence of a device numb */

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