/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_S390_DIAG288_H
#define _ASM_S390_DIAG288_H

#include <asm/asm-extable.h>
#include <asm/types.h>

#define MIN_INTERVAL 15     /* Minimal time supported by diag288 */
#define MAX_INTERVAL 3600   /* One hour should be enough - pure estimation */

#define WDT_DEFAULT_TIMEOUT 30

/* Function codes - init, change, cancel */
#define WDT_FUNC_INIT 0
#define WDT_FUNC_CHANGE 1
#define WDT_FUNC_CANCEL 2
#define WDT_FUNC_CONCEAL 0x80000000

/* Action codes for LPAR watchdog */
#define LPARWDT_RESTART 0

static inline int __diag288(unsigned int func, unsigned int timeout,
                            unsigned long action, unsigned int len)
{
        union register_pair r1 = { .even = func, .odd = timeout, };
        union register_pair r3 = { .even = action, .odd = len, };
        int rc = -EINVAL;

        asm volatile(
                "       diag    %[r1],%[r3],0x288\n"
                "0:     lhi     %[rc],0\n"
                "1:"
                EX_TABLE(0b, 1b)
                : [rc] "+d" (rc)
                : [r1] "d" (r1.pair), [r3] "d" (r3.pair)
                : "cc", "memory");
        return rc;
}

#endif /* _ASM_S390_DIAG288_H */