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
22 extern u64 stfle_fac_list[16];
23 extern u64 alt_stfle_fac_list[16];
24
__set_facility(unsigned long nr,void * facilities)25 static 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
__clear_facility(unsigned long nr,void * facilities)34 static 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
__test_facility(unsigned long nr,void * facilities)43 static 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 */
test_facility(unsigned long nr)58 static 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
__stfle_asm(u64 * stfle_fac_list,int size)69 static 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 */
__stfle(u64 * stfle_fac_list,int size)88 static 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
stfle(u64 * stfle_fac_list,int size)107 static 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 /**
115 * stfle_size - Actual size of the facility list as specified by stfle
116 * (number of double words)
117 */
118 unsigned int stfle_size(void);
119
120 #endif /* __ASM_FACILITY_H */
121