1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright IBM Corp. 1999, 2009
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #ifndef __ASM_FACILITY_H
9*4882a593Smuzhiyun #define __ASM_FACILITY_H
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <asm/facility-defs.h>
12*4882a593Smuzhiyun #include <linux/string.h>
13*4882a593Smuzhiyun #include <linux/preempt.h>
14*4882a593Smuzhiyun #include <asm/lowcore.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8)
17*4882a593Smuzhiyun
__set_facility(unsigned long nr,void * facilities)18*4882a593Smuzhiyun static inline void __set_facility(unsigned long nr, void *facilities)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun unsigned char *ptr = (unsigned char *) facilities;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun if (nr >= MAX_FACILITY_BIT)
23*4882a593Smuzhiyun return;
24*4882a593Smuzhiyun ptr[nr >> 3] |= 0x80 >> (nr & 7);
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
__clear_facility(unsigned long nr,void * facilities)27*4882a593Smuzhiyun static inline void __clear_facility(unsigned long nr, void *facilities)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun unsigned char *ptr = (unsigned char *) facilities;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun if (nr >= MAX_FACILITY_BIT)
32*4882a593Smuzhiyun return;
33*4882a593Smuzhiyun ptr[nr >> 3] &= ~(0x80 >> (nr & 7));
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
__test_facility(unsigned long nr,void * facilities)36*4882a593Smuzhiyun static inline int __test_facility(unsigned long nr, void *facilities)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun unsigned char *ptr;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun if (nr >= MAX_FACILITY_BIT)
41*4882a593Smuzhiyun return 0;
42*4882a593Smuzhiyun ptr = (unsigned char *) facilities + (nr >> 3);
43*4882a593Smuzhiyun return (*ptr & (0x80 >> (nr & 7))) != 0;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun /*
47*4882a593Smuzhiyun * The test_facility function uses the bit odering where the MSB is bit 0.
48*4882a593Smuzhiyun * That makes it easier to query facility bits with the bit number as
49*4882a593Smuzhiyun * documented in the Principles of Operation.
50*4882a593Smuzhiyun */
test_facility(unsigned long nr)51*4882a593Smuzhiyun static inline int test_facility(unsigned long nr)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun unsigned long facilities_als[] = { FACILITIES_ALS };
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {
56*4882a593Smuzhiyun if (__test_facility(nr, &facilities_als))
57*4882a593Smuzhiyun return 1;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun return __test_facility(nr, &S390_lowcore.stfle_fac_list);
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
__stfle_asm(u64 * stfle_fac_list,int size)62*4882a593Smuzhiyun static inline unsigned long __stfle_asm(u64 *stfle_fac_list, int size)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun register unsigned long reg0 asm("0") = size - 1;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun asm volatile(
67*4882a593Smuzhiyun ".insn s,0xb2b00000,0(%1)" /* stfle */
68*4882a593Smuzhiyun : "+d" (reg0)
69*4882a593Smuzhiyun : "a" (stfle_fac_list)
70*4882a593Smuzhiyun : "memory", "cc");
71*4882a593Smuzhiyun return reg0;
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun /**
75*4882a593Smuzhiyun * stfle - Store facility list extended
76*4882a593Smuzhiyun * @stfle_fac_list: array where facility list can be stored
77*4882a593Smuzhiyun * @size: size of passed in array in double words
78*4882a593Smuzhiyun */
__stfle(u64 * stfle_fac_list,int size)79*4882a593Smuzhiyun static inline void __stfle(u64 *stfle_fac_list, int size)
80*4882a593Smuzhiyun {
81*4882a593Smuzhiyun unsigned long nr;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun asm volatile(
84*4882a593Smuzhiyun " stfl 0(0)\n"
85*4882a593Smuzhiyun : "=m" (S390_lowcore.stfl_fac_list));
86*4882a593Smuzhiyun nr = 4; /* bytes stored by stfl */
87*4882a593Smuzhiyun memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
88*4882a593Smuzhiyun if (S390_lowcore.stfl_fac_list & 0x01000000) {
89*4882a593Smuzhiyun /* More facility bits available with stfle */
90*4882a593Smuzhiyun nr = __stfle_asm(stfle_fac_list, size);
91*4882a593Smuzhiyun nr = min_t(unsigned long, (nr + 1) * 8, size * 8);
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
stfle(u64 * stfle_fac_list,int size)96*4882a593Smuzhiyun static inline void stfle(u64 *stfle_fac_list, int size)
97*4882a593Smuzhiyun {
98*4882a593Smuzhiyun preempt_disable();
99*4882a593Smuzhiyun __stfle(stfle_fac_list, size);
100*4882a593Smuzhiyun preempt_enable();
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun #endif /* __ASM_FACILITY_H */
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