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/* 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
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