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 "qemu/osdep.h" 13 #include "cpu.h" 14 #include "hw/s390x/s390-virtio.h" 15 16 #define MAX_DIAG_SUBCODES 255 17 18 static s390_virtio_fn s390_diag500_table[MAX_DIAG_SUBCODES]; 19 20 void s390_register_virtio_hypercall(uint64_t code, s390_virtio_fn fn) 21 { 22 assert(code < MAX_DIAG_SUBCODES); 23 assert(!s390_diag500_table[code]); 24 25 s390_diag500_table[code] = fn; 26 } 27 28 int s390_virtio_hypercall(CPUS390XState *env) 29 { 30 s390_virtio_fn fn; 31 32 if (env->regs[1] < MAX_DIAG_SUBCODES) { 33 fn = s390_diag500_table[env->regs[1]]; 34 if (fn) { 35 env->regs[2] = fn(&env->regs[2]); 36 return 0; 37 } 38 } 39 40 return -EINVAL; 41 } 42