qemu/hw/s390x/s390-virtio-hcall.c

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/*
* Support for virtio hypercalls on s390
*
* Copyright 2012 IBM Corp.
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include "cpu.h"
#include "hw/s390x/s390-virtio.h"
#define MAX_DIAG_SUBCODES 255
static s390_virtio_fn s390_diag500_table[MAX_DIAG_SUBCODES];
void s390_register_virtio_hypercall(uint64_t code, s390_virtio_fn fn)
{
assert(code < MAX_DIAG_SUBCODES);
assert(!s390_diag500_table[code]);
s390_diag500_table[code] = fn;
}
int s390_virtio_hypercall(CPUS390XState *env)
{
s390_virtio_fn fn;
if (env->regs[1] < MAX_DIAG_SUBCODES) {
fn = s390_diag500_table[env->regs[1]];
if (fn) {
env->regs[2] = fn(&env->regs[2]);
return 0;
}
}
return -EINVAL;
}