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1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef _ASM_S390_DIAG288_H
4#define _ASM_S390_DIAG288_H
5
6#include <asm/asm-extable.h>
7#include <asm/types.h>
8
9#define MIN_INTERVAL 15 /* Minimal time supported by diag288 */
10#define MAX_INTERVAL 3600 /* One hour should be enough - pure estimation */
11
12#define WDT_DEFAULT_TIMEOUT 30
13
14/* Function codes - init, change, cancel */
15#define WDT_FUNC_INIT 0
16#define WDT_FUNC_CHANGE 1
17#define WDT_FUNC_CANCEL 2
18#define WDT_FUNC_CONCEAL 0x80000000
19
20/* Action codes for LPAR watchdog */
21#define LPARWDT_RESTART 0
22
23static inline int __diag288(unsigned int func, unsigned int timeout,
24 unsigned long action, unsigned int len)
25{
26 union register_pair r1 = { .even = func, .odd = timeout, };
27 union register_pair r3 = { .even = action, .odd = len, };
28 int rc = -EINVAL;
29
30 asm volatile(
31 " diag %[r1],%[r3],0x288\n"
32 "0: lhi %[rc],0\n"
33 "1:"
34 EX_TABLE(0b, 1b)
35 : [rc] "+d" (rc)
36 : [r1] "d" (r1.pair), [r3] "d" (r3.pair)
37 : "cc", "memory");
38 return rc;
39}
40
41#endif /* _ASM_S390_DIAG288_H */