2 * Copyright IBM Corp. 1999, 2009
4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 #ifndef __ASM_FACILITY_H
8 #define __ASM_FACILITY_H
10 #include <generated/facilities.h>
14 #include <linux/string.h>
15 #include <linux/preempt.h>
16 #include <asm/lowcore.h>
18 #define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */
20 static inline int __test_facility(unsigned long nr
, void *facilities
)
24 if (nr
>= MAX_FACILITY_BIT
)
26 ptr
= (unsigned char *) facilities
+ (nr
>> 3);
27 return (*ptr
& (0x80 >> (nr
& 7))) != 0;
31 * The test_facility function uses the bit odering where the MSB is bit 0.
32 * That makes it easier to query facility bits with the bit number as
33 * documented in the Principles of Operation.
35 static inline int test_facility(unsigned long nr
)
37 unsigned long facilities_als
[] = { FACILITIES_ALS
};
39 if (__builtin_constant_p(nr
) && nr
< sizeof(facilities_als
) * 8) {
40 if (__test_facility(nr
, &facilities_als
))
43 return __test_facility(nr
, &S390_lowcore
.stfle_fac_list
);
47 * stfle - Store facility list extended
48 * @stfle_fac_list: array where facility list can be stored
49 * @size: size of passed in array in double words
51 static inline void stfle(u64
*stfle_fac_list
, int size
)
58 : "=m" (S390_lowcore
.stfl_fac_list
));
59 nr
= 4; /* bytes stored by stfl */
60 memcpy(stfle_fac_list
, &S390_lowcore
.stfl_fac_list
, 4);
61 if (S390_lowcore
.stfl_fac_list
& 0x01000000) {
62 /* More facility bits available with stfle */
63 register unsigned long reg0
asm("0") = size
- 1;
65 asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */
67 : "a" (stfle_fac_list
)
69 nr
= (reg0
+ 1) * 8; /* # bytes stored by stfle */
71 memset((char *) stfle_fac_list
+ nr
, 0, size
* 8 - nr
);
75 #endif /* __ASSEMBLY__ */
76 #endif /* __ASM_FACILITY_H */