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
 
 
 
 
 
 
 
 
 
 
16/*
17 * The test_facility function uses the bit odering where the MSB is bit 0.
18 * That makes it easier to query facility bits with the bit number as
19 * documented in the Principles of Operation.
20 */
21static inline int test_facility(unsigned long nr)
22{
23	unsigned char *ptr;
24
25	if (nr >= MAX_FACILITY_BIT)
26		return 0;
27	ptr = (unsigned char *) &S390_lowcore.stfle_fac_list + (nr >> 3);
28	return (*ptr & (0x80 >> (nr & 7))) != 0;
29}
30
31/**
32 * stfle - Store facility list extended
33 * @stfle_fac_list: array where facility list can be stored
34 * @size: size of passed in array in double words
35 */
36static inline void stfle(u64 *stfle_fac_list, int size)
37{
38	unsigned long nr;
39
40	preempt_disable();
41	asm volatile(
42		"	.insn s,0xb2b10000,0(0)\n" /* stfl */
43		"0:\n"
44		EX_TABLE(0b, 0b)
45		: "+m" (S390_lowcore.stfl_fac_list));
46	nr = 4; /* bytes stored by stfl */
47	memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
48	if (S390_lowcore.stfl_fac_list & 0x01000000) {
49		/* More facility bits available with stfle */
50		register unsigned long reg0 asm("0") = size - 1;
51
52		asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */
53			     : "+d" (reg0)
54			     : "a" (stfle_fac_list)
55			     : "memory", "cc");
56		nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
57	}
58	memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
59	preempt_enable();
60}
61
62#endif /* __ASM_FACILITY_H */

 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
16static inline int __test_facility(unsigned long nr, void *facilities)
17{
18	unsigned char *ptr;
19
20	if (nr >= MAX_FACILITY_BIT)
21		return 0;
22	ptr = (unsigned char *) facilities + (nr >> 3);
23	return (*ptr & (0x80 >> (nr & 7))) != 0;
24}
25
26/*
27 * The test_facility function uses the bit odering where the MSB is bit 0.
28 * That makes it easier to query facility bits with the bit number as
29 * documented in the Principles of Operation.
30 */
31static inline int test_facility(unsigned long nr)
32{
33	return __test_facility(nr, &S390_lowcore.stfle_fac_list);
 
 
 
 
 
34}
35
36/**
37 * stfle - Store facility list extended
38 * @stfle_fac_list: array where facility list can be stored
39 * @size: size of passed in array in double words
40 */
41static inline void stfle(u64 *stfle_fac_list, int size)
42{
43	unsigned long nr;
44
45	preempt_disable();
46	asm volatile(
47		"	.insn s,0xb2b10000,0(0)\n" /* stfl */
48		"0:\n"
49		EX_TABLE(0b, 0b)
50		: "+m" (S390_lowcore.stfl_fac_list));
51	nr = 4; /* bytes stored by stfl */
52	memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
53	if (S390_lowcore.stfl_fac_list & 0x01000000) {
54		/* More facility bits available with stfle */
55		register unsigned long reg0 asm("0") = size - 1;
56
57		asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */
58			     : "+d" (reg0)
59			     : "a" (stfle_fac_list)
60			     : "memory", "cc");
61		nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
62	}
63	memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
64	preempt_enable();
65}
66
67#endif /* __ASM_FACILITY_H */