LXR qemu/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
  17static s390_virtio_fn s390_diag500_table[MAX_DIAG_SUBCODES];
  18
  19void 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
  27int 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