qemu

FORK: QEMU emulator
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s390-virtio-hcall.c (950B)

      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-hcall.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 }