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 */