hw/s390x/s390-virtio-hcall.c

   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 }