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 23 static 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 */ 42