projects/linux·blob master · refs

22 lines · 347 B

1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2023
4 */
5
6#include <linux/export.h>
7#include <asm/facility.h>
8
9unsigned int stfle_size(void)
10{
11 static unsigned int size;
12 unsigned int r;
13 u64 dummy;
14
15 r = READ_ONCE(size);
16 if (!r) {
17 r = __stfle_asm(&dummy, 1) + 1;
18 WRITE_ONCE(size, r);
19 }
20 return r;
21}
22EXPORT_SYMBOL(stfle_size);