1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2017 Red Hat Inc 4 * 5 * Authors: 6 * David Hildenbrand <david@redhat.com> 7 */ 8 #ifndef _ASMS390X_FACILITY_H_ 9 #define _ASMS390X_FACILITY_H_ 10 11 #include <libcflat.h> 12 #include <asm/facility.h> 13 #include <asm/arch_def.h> 14 #include <bitops.h> 15 16 #define NB_STFL_DOUBLEWORDS 32 17 extern uint64_t stfl_doublewords[]; 18 19 static inline bool test_facility(int nr) 20 { 21 return test_bit_inv(nr, stfl_doublewords); 22 } 23 24 static inline void stfl(void) 25 { 26 asm volatile(" stfl 0(0)\n" : : : "memory"); 27 } 28 29 static inline void stfle(uint64_t *fac, unsigned int nb_doublewords) 30 { 31 register unsigned long r0 asm("0") = nb_doublewords - 1; 32 33 asm volatile(" .insn s,0xb2b00000,0(%1)\n" 34 : "+d" (r0) : "a" (fac) : "memory", "cc"); 35 } 36 37 static inline void setup_facilities(void) 38 { 39 stfl(); 40 memcpy(stfl_doublewords, &lowcore.stfl, sizeof(lowcore.stfl)); 41 if (test_facility(7)) 42 stfle(stfl_doublewords, NB_STFL_DOUBLEWORDS); 43 } 44 45 #endif 46