1 files changed, 41 insertions, 0 deletions
diff --git a/arch/s390/include/asm/diag288.h b/arch/s390/include/asm/diag288.h
new file mode 100644
index 000000000000..5e1b43cea9d6
--- /dev/null
+++ b/arch/s390/include/asm/diag288.h
@@ -0,0 +1,41 @@
+/* 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 */