1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
8 #ifndef __ASM_FACILITY_H
9 #define __ASM_FACILITY_H
11 #include <asm/facility-defs.h>
12 #include <linux/string.h>
13 #include <linux/preempt.h>
14 #include <asm/lowcore.h>
16 #define MAX_FACILITY_BIT (sizeof(stfle_fac_list) * 8)
18 extern u64 stfle_fac_list[16];
19 extern u64 alt_stfle_fac_list[16];
21 static inline void __set_facility(unsigned long nr, void *facilities)
23 unsigned char *ptr = (unsigned char *) facilities;
25 if (nr >= MAX_FACILITY_BIT)
27 ptr[nr >> 3] |= 0x80 >> (nr & 7);
30 static inline void __clear_facility(unsigned long nr, void *facilities)
32 unsigned char *ptr = (unsigned char *) facilities;
34 if (nr >= MAX_FACILITY_BIT)
36 ptr[nr >> 3] &= ~(0x80 >> (nr & 7));
39 static inline int __test_facility(unsigned long nr, void *facilities)
43 if (nr >= MAX_FACILITY_BIT)
45 ptr = (unsigned char *) facilities + (nr >> 3);
46 return (*ptr & (0x80 >> (nr & 7))) != 0;
50 * The test_facility function uses the bit ordering where the MSB is bit 0.
51 * That makes it easier to query facility bits with the bit number as
52 * documented in the Principles of Operation.
54 static inline int test_facility(unsigned long nr)
56 unsigned long facilities_als[] = { FACILITIES_ALS };
58 if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {
59 if (__test_facility(nr, &facilities_als))
62 return __test_facility(nr, &stfle_fac_list);
65 static inline unsigned long __stfle_asm(u64 *stfle_fac_list, int size)
67 unsigned long reg0 = size - 1;
71 " .insn s,0xb2b00000,%[list]\n" /* stfle */
73 : [reg0] "+&d" (reg0), [list] "+Q" (*stfle_fac_list)
75 : "memory", "cc", "0");
80 * stfle - Store facility list extended
81 * @stfle_fac_list: array where facility list can be stored
82 * @size: size of passed in array in double words
84 static inline void __stfle(u64 *stfle_fac_list, int size)
91 : "=m" (S390_lowcore.stfl_fac_list));
92 stfl_fac_list = S390_lowcore.stfl_fac_list;
93 memcpy(stfle_fac_list, &stfl_fac_list, 4);
94 nr = 4; /* bytes stored by stfl */
95 if (stfl_fac_list & 0x01000000) {
96 /* More facility bits available with stfle */
97 nr = __stfle_asm(stfle_fac_list, size);
98 nr = min_t(unsigned long, (nr + 1) * 8, size * 8);
100 memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
103 static inline void stfle(u64 *stfle_fac_list, int size)
106 __stfle(stfle_fac_list, size);
110 #endif /* __ASM_FACILITY_H */