include/minix/const.h

   1 #ifndef _MINIX_CONST_H
   2 #define _MINIX_CONST_H
   3
   4 #include <machine/archconst.h>
   5
   6 /* The UNUSED annotation tells the compiler or lint not to complain
   7  * about an unused variable or function parameter.
   8  *
   9  * A number of different annotations are used, depending on the
  10  * compiler or checker that is looking at the code.
  11  *
  12  * Note that some variants rename the parameter, so if you use
  13  * the parameter after all, you'll get a complaint about a missing
  14  * variable.
  15  *
  16  * You use it like this:
  17  *
  18  *   void foo(int UNUSED(x)){}
  19  */
  20
  21 #ifndef UNUSED
  22 #if defined _lint
  23 # define UNUSED(v) /*lint -e(715,818)*/ v
  24 #elif defined(__GNUC__)
  25 # define UNUSED(v) UNUSED_ ## v __attribute((unused))
  26 #elif defined __LCLINT__
  27 # define UNUSED(v) /*@unused@*/ v
  28 #else
  29 # define UNUSED(v) _UNUSED_ ## v
  30 #endif
  31 #endif
  32
  33 #define EXTERN        extern    /* used in *.h files */
  34
  35 #define TRUE               1    /* used for turning integers into Booleans */
  36 #define FALSE              0    /* used for turning integers into Booleans */
  37
  38 #define SUPER_USER ((uid_t) 0)  /* uid_t of superuser */
  39
  40 #include <sys/null.h>      /* NULL Pointer */
  41
  42 #define SCPVEC_NR         64    /* max # of entries in a SYS_VSAFECOPY request */
  43 #define MAPVEC_NR         64    /* max # of entries in a SYS_VUMAP request */
  44 #define NR_IOREQS         64    /* maximum number of entries in an iorequest */
  45
  46 #define VUA_READ        0x01    /* for SYS_VUMAP: read access */
  47 #define VUA_WRITE       0x02    /* for SYS_VUMAP: write access */
  48
  49 /* Message passing constants. */
  50 #define MESS_SIZE (sizeof(message))     /* might need usizeof from FS here */
  51
  52 /* Memory related constants. */
  53 #define SEGMENT_TYPE  0xFF00    /* bit mask to get segment type */
  54 #define SEGMENT_INDEX 0x00FF    /* bit mask to get segment index */
  55
  56 #define PHYS_SEG      0x0400    /* flag indicating entire physical memory */
  57
  58 #define LOCAL_VM_SEG  0x1000    /* same as LOCAL_SEG, but with vm lookup */
  59 #define MEM_GRANT       3
  60 #define VIR_ADDR        1
  61 #define VM_D            (LOCAL_VM_SEG | VIR_ADDR)
  62 #define VM_GRANT        (LOCAL_VM_SEG | MEM_GRANT)
  63
  64 /* Labels used to disable code sections for different reasons. */
  65 #define DEAD_CODE          0    /* unused code in normal configuration */
  66 #define FUTURE_CODE        0    /* new code to be activated + tested later */
  67 #define TEMP_CODE          1    /* active code to be removed later */
  68
  69 /* Miscellaneous */
  70 #define BYTE            0377    /* mask for 8 bits */
  71 #define READING            0    /* copy data to user */
  72 #define WRITING            1    /* copy data from user */
  73 #define PEEKING            2    /* retrieve FS data without copying */
  74 #define HAVE_SCATTERED_IO  1    /* scattered I/O is now standard */
  75
  76 /* Memory is allocated in clicks. */
  77 #if defined(__i386__) || defined(__arm__)
  78 #define CLICK_SIZE      4096    /* unit in which memory is allocated */
  79 #define CLICK_SHIFT       12    /* log2 of CLICK_SIZE */
  80 #else
  81 #error Unsupported arch
  82 #endif
  83
  84 /* Click alignment macros. */
  85 #define CLICK_FLOOR(n)  (((vir_bytes)(n) / CLICK_SIZE) * CLICK_SIZE)
  86 #define CLICK_CEIL(n)   CLICK_FLOOR((vir_bytes)(n) + CLICK_SIZE-1)
  87
  88 /* Sizes of memory tables. The boot monitor distinguishes three memory areas,
  89  * namely low mem below 1M, 1M-16M, and mem after 16M. More chunks are needed
  90  * for DOS MINIX.
  91 */
  92 #define NR_MEMS            16
  93
  94 #define CLICK2ABS(v) ((v) << CLICK_SHIFT)
  95 #define ABS2CLICK(a) ((a) >> CLICK_SHIFT)
  96
  97 /* Flag bits for i_mode in the inode. */
  98 #define I_TYPE          0170000 /* this field gives inode type */
  99 #define I_UNIX_SOCKET   0140000 /* unix domain socket */
 100 #define I_SYMBOLIC_LINK 0120000 /* file is a symbolic link */
 101 #define I_REGULAR       0100000 /* regular file, not dir or special */
 102 #define I_BLOCK_SPECIAL 0060000 /* block special file */
 103 #define I_DIRECTORY     0040000 /* file is a directory */
 104 #define I_CHAR_SPECIAL  0020000 /* character special file */
 105 #define I_NAMED_PIPE    0010000 /* named pipe (FIFO) */
 106 #define I_SET_UID_BIT   0004000 /* set effective uid_t on exec */
 107 #define I_SET_GID_BIT   0002000 /* set effective gid_t on exec */
 108 #define I_SET_STCKY_BIT 0001000 /* sticky bit */
 109 #define ALL_MODES       0007777 /* all bits for user, group and others */
 110 #define RWX_MODES       0000777 /* mode bits for RWX only */
 111 #define R_BIT           0000004 /* Rwx protection bit */
 112 #define W_BIT           0000002 /* rWx protection bit */
 113 #define X_BIT           0000001 /* rwX protection bit */
 114 #define I_NOT_ALLOC     0000000 /* this inode is free */
 115
 116 /* Some limits. */
 117 #define MAX_INODE_NR ((ino_t) 037777777777)     /* largest inode number */
 118 #define MAX_FILE_POS ((off_t) 0x7FFFFFFF)       /* largest legal file offset */
 119 #define UMAX_FILE_POS ((unsigned) 0x7FFFFFFF)   /* largest legal file offset */
 120
 121 #define MAX_SYM_LOOPS   8       /* how many symbolic links are recursed */
 122
 123 #define NO_BLOCK              ((block_t) 0)     /* absence of a block number */
 124 #define NO_ENTRY                ((ino_t) 0)     /* absence of a dir entry */
 125 #define NO_ZONE                ((zone_t) 0)     /* absence of a zone number */
 126 #define NO_DEV                  ((dev_t) 0)     /* absence of a device numb */
 127 #define NO_LINK               ((nlink_t) 0)     /* absence of incoming links */
 128 #define INVAL_UID              ((uid_t) -1)     /* invalid uid value */
 129 #define INVAL_GID              ((gid_t) -1)     /* invalid gid value */
 130
 131 #define SERVARNAME              "cttyline"
 132 #define ARCHVARNAME             "arch"
 133 #define BOARDVARNAME            "board"
 134 #define SERBAUDVARNAME          "cttybaud"
 135
 136 /* Bits for s_flags in the privilege structure. */
 137 #define PREEMPTIBLE     0x002   /* kernel tasks are not preemptible */
 138 #define BILLABLE        0x004   /* some processes are not billable */
 139 #define DYN_PRIV_ID     0x008   /* privilege id assigned dynamically */
 140
 141 #define SYS_PROC        0x010   /* system processes have own priv structure */
 142 #define CHECK_IO_PORT   0x020   /* check if I/O request is allowed */
 143 #define CHECK_IRQ       0x040   /* check if IRQ can be used */
 144 #define CHECK_MEM       0x080   /* check if (VM) mem map request is allowed */
 145 #define ROOT_SYS_PROC   0x100   /* this is a root system process instance */
 146 #define VM_SYS_PROC     0x200   /* this is a vm system process instance */
 147 #define LU_SYS_PROC     0x400   /* this is a live updated sys proc instance */
 148 #define RST_SYS_PROC    0x800   /* this is a restarted sys proc instance */
 149
 150 /* Values for the "verbose" boot monitor variable */
 151 #define VERBOSEBOOT_QUIET 0
 152 #define VERBOSEBOOT_BASIC 1
 153 #define VERBOSEBOOT_EXTRA 2
 154 #define VERBOSEBOOT_MAX   3
 155 #define VERBOSEBOOTVARNAME "verbose"
 156
 157 /* magic value to put in struct proc entries for sanity checks. */
 158 #define PMAGIC 0xC0FFEE1
 159
 160 /* MINIX_KERNFLAGS flags */
 161 #define MKF_I386_INTEL_SYSENTER (1L << 0) /* SYSENTER available and supported */
 162 #define MKF_I386_AMD_SYSCALL    (1L << 1) /* SYSCALL available and supported */
 163
 164 #endif /* _MINIX_CONST_H */