1 /*
2 * Copyright IBM Corp. 1999, 2009
3 *
4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
5 */
6
7 #ifndef __ASM_FACILITY_H
8 #define __ASM_FACILITY_H
9
10 #include <linux/string.h>
11 #include <linux/preempt.h>
12 #include <asm/lowcore.h>
13
14 #define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */
15
__set_facility(unsigned long nr,void * facilities)16 static inline void __set_facility(unsigned long nr, void *facilities)
17 {
18 unsigned char *ptr = (unsigned char *) facilities;
19
20 if (nr >= MAX_FACILITY_BIT)
21 return;
22 ptr[nr >> 3] |= 0x80 >> (nr & 7);
23 }
24
__clear_facility(unsigned long nr,void * facilities)25 static inline void __clear_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
__test_facility(unsigned long nr,void * facilities)34 static inline int __test_facility(unsigned long nr, void *facilities)
35 {
36 unsigned char *ptr;
37
38 if (nr >= MAX_FACILITY_BIT)
39 return 0;
40 ptr = (unsigned char *) facilities + (nr >> 3);
41 return (*ptr & (0x80 >> (nr & 7))) != 0;
42 }
43
44 /*
45 * The test_facility function uses the bit odering where the MSB is bit 0.
46 * That makes it easier to query facility bits with the bit number as
47 * documented in the Principles of Operation.
48 */
test_facility(unsigned long nr)49 static inline int test_facility(unsigned long nr)
50 {
51 return __test_facility(nr, &S390_lowcore.stfle_fac_list);
52 }
53
__stfle_asm(u64 * stfle_fac_list,int size)54 static inline unsigned long __stfle_asm(u64 *stfle_fac_list, int size)
55 {
56 register unsigned long reg0 asm("0") = size - 1;
57
58 asm volatile(
59 ".insn s,0xb2b00000,0(%1)" /* stfle */
60 : "+d" (reg0)
61 : "a" (stfle_fac_list)
62 : "memory", "cc");
63 return reg0;
64 }
65
66 /**
67 * stfle - Store facility list extended
68 * @stfle_fac_list: array where facility list can be stored
69 * @size: size of passed in array in double words
70 */
stfle(u64 * stfle_fac_list,int size)71 static inline void stfle(u64 *stfle_fac_list, int size)
72 {
73 unsigned long nr;
74
75 preempt_disable();
76 asm volatile(
77 " .insn s,0xb2b10000,0(0)\n" /* stfl */
78 "0:\n"
79 EX_TABLE(0b, 0b)
80 : "+m" (S390_lowcore.stfl_fac_list));
81 nr = 4; /* bytes stored by stfl */
82 memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
83 if (S390_lowcore.stfl_fac_list & 0x01000000) {
84 /* More facility bits available with stfle */
85 nr = __stfle_asm(stfle_fac_list, size);
86 nr = min_t(unsigned long, (nr + 1) * 8, size * 8);
87 }
88 memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
89 preempt_enable();
90 }
91
92 #endif /* __ASM_FACILITY_H */
93