| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright IBM Corp. 2024 |
| * |
| * Authors: |
| * Hariharan Mari <hari55@linux.ibm.com> |
| * |
| * Get the facility bits with the STFLE instruction |
| */ |
| |
| #ifndef SELFTEST_KVM_FACILITY_H |
| #define SELFTEST_KVM_FACILITY_H |
| |
| #include <linux/bitops.h> |
| |
| /* alt_stfle_fac_list[16] + stfle_fac_list[16] */ |
| #define NB_STFL_DOUBLEWORDS 32 |
| |
| extern uint64_t stfl_doublewords[NB_STFL_DOUBLEWORDS]; |
| extern bool stfle_flag; |
| |
| static inline bool test_bit_inv(unsigned long nr, const unsigned long *ptr) |
| { |
| return test_bit(nr ^ (BITS_PER_LONG - 1), ptr); |
| } |
| |
| static inline void stfle(uint64_t *fac, unsigned int nb_doublewords) |
| { |
| register unsigned long r0 asm("0") = nb_doublewords - 1; |
| |
| asm volatile(" .insn s,0xb2b00000,0(%1)\n" |
| : "+d" (r0) |
| : "a" (fac) |
| : "memory", "cc"); |
| } |
| |
| static inline void setup_facilities(void) |
| { |
| stfle(stfl_doublewords, NB_STFL_DOUBLEWORDS); |
| stfle_flag = true; |
| } |
| |
| static inline bool test_facility(int nr) |
| { |
| if (!stfle_flag) |
| setup_facilities(); |
| return test_bit_inv(nr, stfl_doublewords); |
| } |
| |
| #endif |
