kernel/const.h

   1 /* General macros and constants used by the kernel. */
   2 #ifndef CONST_H
   3 #define CONST_H
   4
   5 #include <minix/config.h>
   6 #include <minix/bitmap.h>
   7
   8 #include "config.h"
   9
  10 /* Map a process number to a privilege structure id. */
  11 #define s_nr_to_id(n)   (NR_TASKS + (n) + 1)
  12
  13 /* Translate a pointer to a field in a structure to a pointer to the structure
  14  * itself. So it translates '&struct_ptr->field' back to 'struct_ptr'.
  15  */
  16 #define structof(type, field, ptr) \
  17         ((type *) (((char *) (ptr)) - offsetof(type, field)))
  18
  19 /* Translate an endpoint number to a process number, return success. */
  20 #define isokendpt(e,p) isokendpt_d((e),(p),0)
  21 #define okendpt(e,p)   isokendpt_d((e),(p),1)
  22
  23 /* Constants used in virtual_copy(). Values must be 0 and 1, respectively. */
  24 #define _SRC_   0
  25 #define _DST_   1
  26
  27 /* Number of random sources */
  28 #define RANDOM_SOURCES  16
  29
  30 #define get_sys_bit(map,bit) \
  31         ( MAP_CHUNK(map.chunk,bit) & (1 << CHUNK_OFFSET(bit) )
  32 #define get_sys_bits(map,bit) \
  33         ( MAP_CHUNK(map.chunk,bit) )
  34 #define set_sys_bit(map,bit) \
  35         ( MAP_CHUNK(map.chunk,bit) |= (1 << CHUNK_OFFSET(bit) )
  36 #define unset_sys_bit(map,bit) \
  37         ( MAP_CHUNK(map.chunk,bit) &= ~(1 << CHUNK_OFFSET(bit) )
  38 #define NR_SYS_CHUNKS   BITMAP_CHUNKS(NR_SYS_PROCS)
  39
  40 #if DEBUG_LOCK_CHECK
  41 #define reallock(c, v)  { if(intr_disabled()) { kinfo.relocking++; } else { intr_disable(); } }
  42 #else
  43 #define reallock(c, v)  intr_disable()
  44 #endif
  45
  46 #define realunlock(c)   intr_enable()
  47
  48 #if DEBUG_TIME_LOCKS
  49 #define lock(c, v)    do { reallock(c, v); locktimestart(c, v); } while(0)
  50 #define unlock(c)     do { locktimeend(c); realunlock(c); } while(0)
  51 #else
  52 /* Disable/ enable hardware interrupts. The parameters of lock() and unlock()
  53  * are used when debugging is enabled. See debug.h for more information.
  54  */
  55 #define lock(c, v)      reallock(c, v)
  56 #define unlock(c)       realunlock(c)
  57 #endif
  58
  59 /* args to intr_init() */
  60 #define INTS_ORIG       0       /* restore interrupts */
  61 #define INTS_MINIX      1       /* initialize interrupts for minix */
  62
  63 #endif /* CONST_H */