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Diffstat (limited to 'arch/s390/include/asm/facility.h')
-rw-r--r-- | arch/s390/include/asm/facility.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/s390/include/asm/facility.h b/arch/s390/include/asm/facility.h new file mode 100644 index 000000000000..1e5b27edc0c9 --- /dev/null +++ b/arch/s390/include/asm/facility.h | |||
@@ -0,0 +1,63 @@ | |||
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 | */ | ||
21 | static 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 | */ | ||
36 | static inline void stfle(u64 *stfle_fac_list, int size) | ||
37 | { | ||
38 | unsigned long nr; | ||
39 | |||
40 | preempt_disable(); | ||
41 | S390_lowcore.stfl_fac_list = 0; | ||
42 | asm volatile( | ||
43 | " .insn s,0xb2b10000,0(0)\n" /* stfl */ | ||
44 | "0:\n" | ||
45 | EX_TABLE(0b, 0b) | ||
46 | : "=m" (S390_lowcore.stfl_fac_list)); | ||
47 | nr = 4; /* bytes stored by stfl */ | ||
48 | memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); | ||
49 | if (S390_lowcore.stfl_fac_list & 0x01000000) { | ||
50 | /* More facility bits available with stfle */ | ||
51 | register unsigned long reg0 asm("0") = size - 1; | ||
52 | |||
53 | asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */ | ||
54 | : "+d" (reg0) | ||
55 | : "a" (stfle_fac_list) | ||
56 | : "memory", "cc"); | ||
57 | nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ | ||
58 | } | ||
59 | memset((char *) stfle_fac_list + nr, 0, size * 8 - nr); | ||
60 | preempt_enable(); | ||
61 | } | ||
62 | |||
63 | #endif /* __ASM_FACILITY_H */ | ||