tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright IBM Corp. 2024
4 *
5 * Authors:
6 * Hariharan Mari <hari55@linux.ibm.com>
7 *
8 * Get the facility bits with the STFLE instruction
9 */
10
11#ifndef SELFTEST_KVM_FACILITY_H
12#define SELFTEST_KVM_FACILITY_H
13
14#include <linux/bitops.h>
15
16/* alt_stfle_fac_list[16] + stfle_fac_list[16] */
17#define NB_STFL_DOUBLEWORDS 32
18
19extern uint64_t stfl_doublewords[NB_STFL_DOUBLEWORDS];
20extern bool stfle_flag;
21
22static inline bool test_bit_inv(unsigned long nr, const unsigned long *ptr)
23{
24 return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);
25}
26
27static inline void stfle(uint64_t *fac, unsigned int nb_doublewords)
28{
29 register unsigned long r0 asm("0") = nb_doublewords - 1;
30
31 asm volatile(" .insn s,0xb2b00000,0(%1)\n"
32 : "+d" (r0)
33 : "a" (fac)
34 : "memory", "cc");
35}
36
37static inline void setup_facilities(void)
38{
39 stfle(stfl_doublewords, NB_STFL_DOUBLEWORDS);
40 stfle_flag = true;
41}
42
43static inline bool test_facility(int nr)
44{
45 if (!stfle_flag)
46 setup_facilities();
47 return test_bit_inv(nr, stfl_doublewords);
48}
49
50#endif