diag288.h

 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 */