projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| a0616cde DH |
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 | ||
| c30f6828 | 11 | #include <generated/facilities.h> |
| a0616cde DH |
12 | #include <linux/string.h> |
| 13 | #include <linux/preempt.h> | |
| 14 | #include <asm/lowcore.h> | |
| 15 | ||
| 6f5165e8 | 16 | #define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8) |
| a0616cde | 17 | |
| 32089246 MM |
18 | static inline int __test_facility(unsigned long nr, void *facilities) |
| 19 | { | |
| 20 | unsigned char *ptr; | |
| 21 | ||
| 22 | if (nr >= MAX_FACILITY_BIT) | |
| 23 | return 0; | |
| 24 | ptr = (unsigned char *) facilities + (nr >> 3); | |
| 25 | return (*ptr & (0x80 >> (nr & 7))) != 0; | |
| 26 | } | |
| 27 | ||
| a0616cde DH |
28 | /* |
| 29 | * The test_facility function uses the bit odering where the MSB is bit 0. | |
| 30 | * That makes it easier to query facility bits with the bit number as | |
| 31 | * documented in the Principles of Operation. | |
| 32 | */ | |
| 33 | static inline int test_facility(unsigned long nr) | |
| 34 | { | |
| 6ab6c31a HC |
35 | unsigned long facilities_als[] = { FACILITIES_ALS }; |
| 36 | ||
| 37 | if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) { | |
| 38 | if (__test_facility(nr, &facilities_als)) | |
| 39 | return 1; | |
| 40 | } | |
| 32089246 | 41 | return __test_facility(nr, &S390_lowcore.stfle_fac_list); |
| a0616cde DH |
42 | } |
| 43 | ||
| 44 | /** | |
| 45 | * stfle - Store facility list extended | |
| 46 | * @stfle_fac_list: array where facility list can be stored | |
| 47 | * @size: size of passed in array in double words | |
| 48 | */ | |
| 49 | static inline void stfle(u64 *stfle_fac_list, int size) | |
| 50 | { | |
| 51 | unsigned long nr; | |
| 52 | ||
| 53 | preempt_disable(); | |
| a0616cde | 54 | asm volatile( |
| 9552a66f HC |
55 | " stfl 0(0)\n" |
| 56 | : "=m" (S390_lowcore.stfl_fac_list)); | |
| a0616cde DH |
57 | nr = 4; /* bytes stored by stfl */ |
| 58 | memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); | |
| 59 | if (S390_lowcore.stfl_fac_list & 0x01000000) { | |
| 60 | /* More facility bits available with stfle */ | |
| 61 | register unsigned long reg0 asm("0") = size - 1; | |
| 62 | ||
| 63 | asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */ | |
| 64 | : "+d" (reg0) | |
| 65 | : "a" (stfle_fac_list) | |
| 66 | : "memory", "cc"); | |
| 67 | nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ | |
| 68 | } | |
| 69 | memset((char *) stfle_fac_list + nr, 0, size * 8 - nr); | |
| 70 | preempt_enable(); | |
| 71 | } | |
| 72 | ||
| 73 | #endif /* __ASM_FACILITY_H */ |