include/minix/const.h

   1
   2 #ifndef CHIP
   3 #error CHIP is not defined
   4 #endif
   5
   6 #define EXTERN        extern    /* used in *.h files */
   7 #define PRIVATE       static    /* PRIVATE x limits the scope of x */
   8 #define PUBLIC                  /* PUBLIC is the opposite of PRIVATE */
   9 #define FORWARD       static    /* some compilers require this to be 'static'*/
  10
  11 #define TRUE               1    /* used for turning integers into Booleans */
  12 #define FALSE              0    /* used for turning integers into Booleans */
  13
  14 #define DEFAULT_HZ        60    /* clock freq (software settable on IBM-PC) */
  15
  16 #define SUPER_USER (uid_t) 0    /* uid_t of superuser */
  17
  18 #define NULL     ((void *)0)    /* null pointer */
  19 #define CPVEC_NR          16    /* max # of entries in a SYS_VCOPY request */
  20 #define CPVVEC_NR         64    /* max # of entries in a SYS_VCOPY request */
  21 #define SCPVEC_NR         64    /* max # of entries in a SYS_VSAFECOPY* request */
  22 #define NR_IOREQS         64
  23                                 /* maximum number of entries in an iorequest */
  24
  25 /* Message passing constants. */
  26 #define MESS_SIZE (sizeof(message))     /* might need usizeof from FS here */
  27 #define NIL_MESS ((message *) 0)        /* null pointer */
  28
  29 /* Memory related constants. */
  30 #define SEGMENT_TYPE  0xFF00    /* bit mask to get segment type */
  31 #define SEGMENT_INDEX 0x00FF    /* bit mask to get segment index */
  32
  33 #define LOCAL_SEG     0x0000    /* flags indicating local memory segment */
  34 #define NR_LOCAL_SEGS      3    /* # local segments per process (fixed) */
  35 #define T                  0    /* proc[i].mem_map[T] is for text */
  36 #define D                  1    /* proc[i].mem_map[D] is for data */
  37 #define S                  2    /* proc[i].mem_map[S] is for stack */
  38
  39 #define REMOTE_SEG    0x0100    /* flags indicating remote memory segment */
  40 #define NR_REMOTE_SEGS     3    /* # remote memory regions (variable) */
  41
  42 #define BIOS_SEG      0x0200    /* flags indicating BIOS memory segment */
  43 #define NR_BIOS_SEGS       3    /* # BIOS memory regions (variable) */
  44
  45 #define PHYS_SEG      0x0400    /* flag indicating entire physical memory */
  46
  47 #define LOCAL_VM_SEG  0x1000    /* same as LOCAL_SEG, but with vm lookup */
  48 #define VM_D            (LOCAL_VM_SEG | D)
  49 #define VM_T            (LOCAL_VM_SEG | T)
  50 #define MEM_GRANT       3
  51 #define VM_GRANT        (LOCAL_VM_SEG | MEM_GRANT)
  52
  53 /* Labels used to disable code sections for different reasons. */
  54 #define DEAD_CODE          0    /* unused code in normal configuration */
  55 #define FUTURE_CODE        0    /* new code to be activated + tested later */
  56 #define TEMP_CODE          1    /* active code to be removed later */
  57
  58 /* Process name length in the PM process table, including '\0'. */
  59 #define PROC_NAME_LEN   16
  60
  61 /* Miscellaneous */
  62 #define BYTE            0377    /* mask for 8 bits */
  63 #define READING            0    /* copy data to user */
  64 #define WRITING            1    /* copy data from user */
  65 #define NO_NUM        0x8000    /* used as numerical argument to panic() */
  66 #define NIL_PTR   (char *) 0    /* generally useful expression */
  67 #define HAVE_SCATTERED_IO  1    /* scattered I/O is now standard */
  68
  69 /* Macros. */
  70 #define MAX(a, b)   ((a) > (b) ? (a) : (b))
  71 #define MIN(a, b)   ((a) < (b) ? (a) : (b))
  72
  73 /* Memory is allocated in clicks. */
  74 #if (CHIP == INTEL)
  75 #define CLICK_SIZE      4096    /* unit in which memory is allocated */
  76 #define CLICK_SHIFT       12    /* log2 of CLICK_SIZE */
  77 #endif
  78
  79 #if (CHIP == SPARC) || (CHIP == M68000)
  80 #define CLICK_SIZE      4096    /* unit in which memory is allocated */
  81 #define CLICK_SHIFT       12    /* log2 of CLICK_SIZE */
  82 #endif
  83
  84 /* Sizes of memory tables. The boot monitor distinguishes three memory areas,
  85  * namely low mem below 1M, 1M-16M, and mem after 16M. More chunks are needed
  86  * for DOS MINIX.
  87 */
  88 #define NR_MEMS            8
  89
  90
  91 /* Click to byte conversions (and vice versa). */
  92 #define HCLICK_SHIFT       4    /* log2 of HCLICK_SIZE */
  93 #define HCLICK_SIZE       16    /* hardware segment conversion magic */
  94 #if CLICK_SIZE >= HCLICK_SIZE
  95 #define click_to_hclick(n) ((n) << (CLICK_SHIFT - HCLICK_SHIFT))
  96 #else
  97 #define click_to_hclick(n) ((n) >> (HCLICK_SHIFT - CLICK_SHIFT))
  98 #endif
  99 #define hclick_to_physb(n) ((phys_bytes) (n) << HCLICK_SHIFT)
 100 #define physb_to_hclick(n) ((n) >> HCLICK_SHIFT)
 101
 102 #define ABS             -999    /* this process means absolute memory */
 103
 104 /* Flag bits for i_mode in the inode. */
 105 #define I_TYPE          0170000 /* this field gives inode type */
 106 #define I_SYMBOLIC_LINK 0120000 /* file is a symbolic link */
 107 #define I_REGULAR       0100000 /* regular file, not dir or special */
 108 #define I_BLOCK_SPECIAL 0060000 /* block special file */
 109 #define I_DIRECTORY     0040000 /* file is a directory */
 110 #define I_CHAR_SPECIAL  0020000 /* character special file */
 111 #define I_NAMED_PIPE    0010000 /* named pipe (FIFO) */
 112 #define I_SET_UID_BIT   0004000 /* set effective uid_t on exec */
 113 #define I_SET_GID_BIT   0002000 /* set effective gid_t on exec */
 114 #define ALL_MODES       0006777 /* all bits for user, group and others */
 115 #define RWX_MODES       0000777 /* mode bits for RWX only */
 116 #define R_BIT           0000004 /* Rwx protection bit */
 117 #define W_BIT           0000002 /* rWx protection bit */
 118 #define X_BIT           0000001 /* rwX protection bit */
 119 #define I_NOT_ALLOC     0000000 /* this inode is free */
 120
 121 /* Some limits. */
 122 #define MAX_INODE_NR ((ino_t) 037777777777)     /* largest inode number */
 123 #define MAX_FILE_POS ((off_t) 0x7FFFFFFF)       /* largest legal file offset */
 124
 125 #define MAX_SYM_LOOPS   8       /* how many symbolic links are recursed */
 126
 127 #define NO_BLOCK              ((block_t) 0)     /* absence of a block number */
 128 #define NO_ENTRY                ((ino_t) 0)     /* absence of a dir entry */
 129 #define NO_ZONE                ((zone_t) 0)     /* absence of a zone number */
 130 #define NO_DEV                  ((dev_t) 0)     /* absence of a device numb */
 131
 132 #define SERVARNAME              "cttyline"
 133
 134 /* Bits for the system property flags in boot image processes. */
 135 #define PREEMPTIBLE     0x02    /* kernel tasks are not preemptible */
 136 #define BILLABLE        0x04    /* some processes are not billable */
 137
 138 #define SYS_PROC        0x10    /* system processes have own priv structure */
 139 #define CHECK_IO_PORT   0x20    /* check if I/O request is allowed */
 140 #define CHECK_IRQ       0x40    /* check if IRQ can be used */
 141 #define CHECK_MEM       0x80    /* check if (VM) mem map request is allowed */
 142 #define PROC_FULLVM    0x100    /* VM sets and manages full pagetable */
 143