1 /* 2 * Support for virtio hypercalls on s390 3 * 4 * Copyright 2012 IBM Corp. 5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or (at 8 * your option) any later version. See the COPYING file in the top-level 9 * directory. 10 */ 11 12 #include "cpu.h" 13 #include "hw/s390x/s390-virtio.h" 14 15 #define MAX_DIAG_SUBCODES 255 16 17 static s390_virtio_fn s390_diag500_table[MAX_DIAG_SUBCODES]; 18 19 void s390_register_virtio_hypercall(uint64_t code, s390_virtio_fn fn) 20 { 21 assert(code < MAX_DIAG_SUBCODES); 22 assert(!s390_diag500_table[code]); 23 24 s390_diag500_table[code] = fn; 25 } 26 27 int s390_virtio_hypercall(CPUS390XState *env) 28 { 29 s390_virtio_fn fn; 30 31 if (env->regs[1] < MAX_DIAG_SUBCODES) { 32 fn = s390_diag500_table[env->regs[1]]; 33 if (fn) { 34 env->regs[2] = fn(&env->regs[2]); 35 return 0; 36 } 37 } 38 39 return -EINVAL; 40 } 41