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