qemu

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
}
42