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
10 
11 #include <linux/string.h>
12 #include <linux/types.h>
13 
14 #define __MAX_CHPID 255
15 
16 struct chp_id {
17 	u8 reserved1;
18 	u8 cssid;
19 	u8 reserved2;
20 	u8 id;
21 } __attribute__((packed));
22 
23 #ifdef __KERNEL__
24 #include <asm/cio.h>
25 
chp_id_init(struct chp_id * chpid)26 static inline void chp_id_init(struct chp_id *chpid)
27 {
28 	memset(chpid, 0, sizeof(struct chp_id));
29 }
30 
chp_id_is_equal(struct chp_id * a,struct chp_id * b)31 static inline int chp_id_is_equal(struct chp_id *a, struct chp_id *b)
32 {
33 	return (a->id == b->id) && (a->cssid == b->cssid);
34 }
35 
chp_id_next(struct chp_id * chpid)36 static inline void chp_id_next(struct chp_id *chpid)
37 {
38 	if (chpid->id < __MAX_CHPID)
39 		chpid->id++;
40 	else {
41 		chpid->id = 0;
42 		chpid->cssid++;
43 	}
44 }
45 
chp_id_is_valid(struct chp_id * chpid)46 static inline int chp_id_is_valid(struct chp_id *chpid)
47 {
48 	return (chpid->cssid <= __MAX_CSSID);
49 }
50 
51 
52 #define chp_id_for_each(c) \
53 	for (chp_id_init(c); chp_id_is_valid(c); chp_id_next(c))
54 #endif /* __KERNEL */
55 
56 #endif /* _ASM_S390_CHPID_H */
57