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
24 static inline void __set_facility(unsigned long nr, void *facilities)
25 {
26 unsigned char *ptr = (unsigned char *) facilities;
27
28 if (nr >= MAX_FACILITY_BIT)
29 return;
30 ptr[nr >> 3] |= 0x80 >> (nr & 7);
31 }
32
33 static inline void __clear_facility(unsigned long nr, void *facilities)
34 {
35 unsigned char *ptr = (unsigned char *) facilities;
36
37 if (nr >= MAX_FACILITY_BIT)
38 return;
39 ptr[nr >> 3] &= ~(0x80 >> (nr & 7));
40 }
41
42 static inline int __test_facility(unsigned long nr, void *facilities)
43 {
44 unsigned char *ptr;
45
46 if (nr >= MAX_FACILITY_BIT)
47 return 0;
48 ptr = (unsigned char *) facilities + (nr >> 3);
49 return (*ptr & (0x80 >> (nr & 7))) != 0;
50 }
51
52 /*
53 * The test_facility function uses the bit ordering where the MSB is bit 0.
54 * That makes it easier to query facility bits with the bit number as
55 * documented in the Principles of Operation.
56 */
57 static inline int test_facility(unsigned long nr)
58 {
59 unsigned long facilities_als[] = { FACILITIES_ALS };
60
61 if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {
62 if (__test_facility(nr, &facilities_als))
63 return 1;
64 }
65 return __test_facility(nr, &stfle_fac_list);
66 }
67
68 static inline unsigned long __stfle_asm(u64 *stfle_fac_list, int size)
69 {
70 unsigned long reg0 = size - 1;
71
72 asm volatile(
73 " lgr 0,%[reg0]\n"
74 " .insn s,0xb2b00000,%[list]\n" /* stfle */
75 " lgr %[reg0],0\n"
76 : [reg0] "+&d" (reg0), [list] "+Q" (*stfle_fac_list)
77 :
78 : "memory", "cc", "");
79 return reg0;
80 }
81
82 /**
83 * stfle - Store facility list extended
84 * @stfle_fac_list: array where facility list can be stored
85 * @size: size of passed in array in double words
86 */
87 static inline void __stfle(u64 *stfle_fac_list, int size)
88 {
89 unsigned long nr;
90 u32 stfl_fac_list;
91
92 asm volatile(
93 " stfl 0(0)\n"
94 : "=m" (get_lowcore()->stfl_fac_list));
95 stfl_fac_list = get_lowcore()->stfl_fac_list;
96 memcpy(stfle_fac_list, &stfl_fac_list, 4);
97 nr = 4; /* bytes stored by stfl */
98 if (stfl_fac_list & 0x01000000) {
99 /* More facility bits available with stfle */
100 nr = __stfle_asm(stfle_fac_list, size);
101 nr = min_t(unsigned long, (nr + 1) * 8, size * 8);
102 }
103 memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
104 }
105
106 static inline void stfle(u64 *stfle_fac_list, int size)
107 {
108 preempt_disable();
109 __stfle(stfle_fac_list, size);
110 preempt_enable();
111 }
112
113 /**
114 * stfle_size - Actual size of the facility list as specified by stfle
115 * (number of double words)
116 */
117 unsigned int stfle_size(void);
118
119 #endif /* __ASM_FACILITY_H */
120
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