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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 1999, 2009
4 *
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
6 */
7
8#ifndef __ASM_FACILITY_H
9#define __ASM_FACILITY_H
10
11#include <asm/facility-defs.h>
12
13#include <linux/minmax.h>
14#include <linux/string.h>
15#include <linux/types.h>
16#include <linux/preempt.h>
17
18#include <asm/lowcore.h>
19
20#define MAX_FACILITY_BIT (sizeof(stfle_fac_list) * 8)
21
22extern u64 stfle_fac_list[16];
23extern u64 alt_stfle_fac_list[16];
24
25static inline void __set_facility(unsigned long nr, void *facilities)
26{
27 unsigned char *ptr = (unsigned char *) facilities;
28
29 if (nr >= MAX_FACILITY_BIT)
30 return;
31 ptr[nr >> 3] |= 0x80 >> (nr & 7);
32}
33
34static inline void __clear_facility(unsigned long nr, void *facilities)
35{
36 unsigned char *ptr = (unsigned char *) facilities;
37
38 if (nr >= MAX_FACILITY_BIT)
39 return;
40 ptr[nr >> 3] &= ~(0x80 >> (nr & 7));
41}
42
43static inline int __test_facility(unsigned long nr, void *facilities)
44{
45 unsigned char *ptr;
46
47 if (nr >= MAX_FACILITY_BIT)
48 return 0;
49 ptr = (unsigned char *) facilities + (nr >> 3);
50 return (*ptr & (0x80 >> (nr & 7))) != 0;
51}
52
53/*
54 * The test_facility function uses the bit ordering where the MSB is bit 0.
55 * That makes it easier to query facility bits with the bit number as
56 * documented in the Principles of Operation.
57 */
58static inline int test_facility(unsigned long nr)
59{
60 unsigned long facilities_als[] = { FACILITIES_ALS };
61
62 if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {
63 if (__test_facility(nr, &facilities_als))
64 return 1;
65 }
66 return __test_facility(nr, &stfle_fac_list);
67}
68
69static inline unsigned long __stfle_asm(u64 *stfle_fac_list, int size)
70{
71 unsigned long reg0 = size - 1;
72
73 asm volatile(
74 " lgr 0,%[reg0]\n"
75 " .insn s,0xb2b00000,%[list]\n" /* stfle */
76 " lgr %[reg0],0\n"
77 : [reg0] "+&d" (reg0), [list] "+Q" (*stfle_fac_list)
78 :
79 : "memory", "cc", "0");
80 return reg0;
81}
82
83/**
84 * stfle - Store facility list extended
85 * @stfle_fac_list: array where facility list can be stored
86 * @size: size of passed in array in double words
87 */
88static inline void __stfle(u64 *stfle_fac_list, int size)
89{
90 unsigned long nr;
91 u32 stfl_fac_list;
92
93 asm volatile(
94 " stfl 0(0)\n"
95 : "=m" (S390_lowcore.stfl_fac_list));
96 stfl_fac_list = S390_lowcore.stfl_fac_list;
97 memcpy(stfle_fac_list, &stfl_fac_list, 4);
98 nr = 4; /* bytes stored by stfl */
99 if (stfl_fac_list & 0x01000000) {
100 /* More facility bits available with stfle */
101 nr = __stfle_asm(stfle_fac_list, size);
102 nr = min_t(unsigned long, (nr + 1) * 8, size * 8);
103 }
104 memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
105}
106
107static inline void stfle(u64 *stfle_fac_list, int size)
108{
109 preempt_disable();
110 __stfle(stfle_fac_list, size);
111 preempt_enable();
112}
113
114#endif /* __ASM_FACILITY_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 1999, 2009
4 *
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
6 */
7
8#ifndef __ASM_FACILITY_H
9#define __ASM_FACILITY_H
10
11#include <asm/facility-defs.h>
12#include <linux/string.h>
13#include <linux/preempt.h>
14#include <asm/lowcore.h>
15
16#define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8)
17
18static inline void __set_facility(unsigned long nr, void *facilities)
19{
20 unsigned char *ptr = (unsigned char *) facilities;
21
22 if (nr >= MAX_FACILITY_BIT)
23 return;
24 ptr[nr >> 3] |= 0x80 >> (nr & 7);
25}
26
27static inline void __clear_facility(unsigned long nr, void *facilities)
28{
29 unsigned char *ptr = (unsigned char *) facilities;
30
31 if (nr >= MAX_FACILITY_BIT)
32 return;
33 ptr[nr >> 3] &= ~(0x80 >> (nr & 7));
34}
35
36static inline int __test_facility(unsigned long nr, void *facilities)
37{
38 unsigned char *ptr;
39
40 if (nr >= MAX_FACILITY_BIT)
41 return 0;
42 ptr = (unsigned char *) facilities + (nr >> 3);
43 return (*ptr & (0x80 >> (nr & 7))) != 0;
44}
45
46/*
47 * The test_facility function uses the bit odering where the MSB is bit 0.
48 * That makes it easier to query facility bits with the bit number as
49 * documented in the Principles of Operation.
50 */
51static inline int test_facility(unsigned long nr)
52{
53 unsigned long facilities_als[] = { FACILITIES_ALS };
54
55 if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {
56 if (__test_facility(nr, &facilities_als))
57 return 1;
58 }
59 return __test_facility(nr, &S390_lowcore.stfle_fac_list);
60}
61
62static inline unsigned long __stfle_asm(u64 *stfle_fac_list, int size)
63{
64 register unsigned long reg0 asm("0") = size - 1;
65
66 asm volatile(
67 ".insn s,0xb2b00000,0(%1)" /* stfle */
68 : "+d" (reg0)
69 : "a" (stfle_fac_list)
70 : "memory", "cc");
71 return reg0;
72}
73
74/**
75 * stfle - Store facility list extended
76 * @stfle_fac_list: array where facility list can be stored
77 * @size: size of passed in array in double words
78 */
79static inline void __stfle(u64 *stfle_fac_list, int size)
80{
81 unsigned long nr;
82
83 asm volatile(
84 " stfl 0(0)\n"
85 : "=m" (S390_lowcore.stfl_fac_list));
86 nr = 4; /* bytes stored by stfl */
87 memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
88 if (S390_lowcore.stfl_fac_list & 0x01000000) {
89 /* More facility bits available with stfle */
90 nr = __stfle_asm(stfle_fac_list, size);
91 nr = min_t(unsigned long, (nr + 1) * 8, size * 8);
92 }
93 memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
94}
95
96static inline void stfle(u64 *stfle_fac_list, int size)
97{
98 preempt_disable();
99 __stfle(stfle_fac_list, size);
100 preempt_enable();
101}
102
103#endif /* __ASM_FACILITY_H */