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 #include "debug.h"
  10
  11 /* Map a process number to a privilege structure id. */
  12 #define s_nr_to_id(n)   (NR_TASKS + (n) + 1)
  13
  14 /* Translate a pointer to a field in a structure to a pointer to the structure
  15  * itself. So it translates '&struct_ptr->field' back to 'struct_ptr'.
  16  */
  17 #define structof(type, field, ptr) \
  18         ((type *) (((char *) (ptr)) - offsetof(type, field)))
  19
  20 /* Translate an endpoint number to a process number, return success. */
  21 #define isokendpt(e,p) isokendpt_d((e),(p),0)
  22 #define okendpt(e,p)   isokendpt_d((e),(p),1)
  23
  24 /* Constants used in virtual_copy(). Values must be 0 and 1, respectively. */
  25 #define _SRC_   0
  26 #define _DST_   1
  27
  28 #define get_sys_bit(map,bit) \
  29         ( MAP_CHUNK(map.chunk,bit) & (1 << CHUNK_OFFSET(bit) )
  30 #define get_sys_bits(map,bit) \
  31         ( MAP_CHUNK(map.chunk,bit) )
  32 #define set_sys_bit(map,bit) \
  33         ( MAP_CHUNK(map.chunk,bit) |= (1 << CHUNK_OFFSET(bit) )
  34 #define unset_sys_bit(map,bit) \
  35         ( MAP_CHUNK(map.chunk,bit) &= ~(1 << CHUNK_OFFSET(bit) )
  36 #define NR_SYS_CHUNKS   BITMAP_CHUNKS(NR_SYS_PROCS)
  37
  38 #define reallock  do { int d; d = intr_disabled(); intr_disable(); locklevel++; if(d && locklevel == 1) { minix_panic("reallock while interrupts disabled first time", __LINE__); } } while(0)
  39
  40 #define realunlock   do { if(!intr_disabled()) { minix_panic("realunlock while interrupts enabled", __LINE__); } if(locklevel < 1) { minix_panic("realunlock while locklevel below 1", __LINE__); } locklevel--; if(locklevel == 0) { intr_enable(); } } while(0)
  41
  42 /* Disable/ enable hardware interrupts. The parameters of lock() and unlock()
  43  * are used when debugging is enabled. See debug.h for more information.
  44  */
  45 #define lock      reallock
  46 #define unlock    realunlock
  47
  48 #ifdef CONFIG_IDLE_TSC
  49 #define IDLE_STOP if(idle_active) { read_tsc_64(&idle_stop); idle_active = 0; }
  50 #else
  51 #define IDLE_STOP
  52 #endif
  53
  54 /* args to intr_init() */
  55 #define INTS_ORIG       0       /* restore interrupts */
  56 #define INTS_MINIX      1       /* initialize interrupts for minix */
  57
  58 /* for kputc() */
  59 #define END_OF_KMESS    0
  60
  61 #endif /* CONST_H */