include/asm-s390/chpid.h

   1 /*
   2  *  drivers/s390/cio/chpid.h
   3  *
   4  *    Copyright IBM Corp. 2007
   5  *    Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   6  */
   7
   8 #ifndef _ASM_S390_CHPID_H
   9 #define _ASM_S390_CHPID_H _ASM_S390_CHPID_H
  10
  11 #include <linux/string.h>
  12 #include <asm/types.h>
  13 #include <asm/cio.h>
  14
  15 #define __MAX_CHPID 255
  16
  17 struct chp_id {
  18         u8 reserved1;
  19         u8 cssid;
  20         u8 reserved2;
  21         u8 id;
  22 } __attribute__((packed));
  23
  24 static inline void chp_id_init(struct chp_id *chpid)
  25 {
  26         memset(chpid, 0, sizeof(struct chp_id));
  27 }
  28
  29 static inline int chp_id_is_equal(struct chp_id *a, struct chp_id *b)
  30 {
  31         return (a->id == b->id) && (a->cssid == b->cssid);
  32 }
  33
  34 static inline void chp_id_next(struct chp_id *chpid)
  35 {
  36         if (chpid->id < __MAX_CHPID)
  37                 chpid->id++;
  38         else {
  39                 chpid->id = 0;
  40                 chpid->cssid++;
  41         }
  42 }
  43
  44 static inline int chp_id_is_valid(struct chp_id *chpid)
  45 {
  46         return (chpid->cssid <= __MAX_CSSID);
  47 }
  48
  49
  50 #define chp_id_for_each(c) \
  51         for (chp_id_init(c); chp_id_is_valid(c); chp_id_next(c))
  52
  53 #endif /* _ASM_S390_CHPID_H */