blob: 6890f63c8b29982050ef0f35fba44ee8912a5c74 [file] [log] [blame] [edit]
/*
* Copyright (C) 2014, Red Hat Inc, Andrew Jones <drjones@redhat.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.
*/
#include "libcflat.h"
#include "virtio.h"
#include "asm/spinlock.h"
#include "chr-testdev.h"
#define TESTDEV_NAME "chr-testdev"
static struct virtio_device *vcon;
static struct virtqueue *in_vq, *out_vq;
static struct spinlock lock;
static void __testdev_send(char *buf, unsigned int len)
{
int ret;
ret = virtqueue_add_outbuf(out_vq, buf, len);
virtqueue_kick(out_vq);
if (ret < 0)
return;
while (!virtqueue_get_buf(out_vq, &len))
;
}
void chr_testdev_exit(int code)
{
unsigned int len;
static char buf[8];
spin_lock(&lock);
if (!vcon)
goto out;
snprintf(buf, sizeof(buf), "%dq", code);
len = strlen(buf);
__testdev_send(buf, len);
out:
spin_unlock(&lock);
}
void chr_testdev_init(void)
{
const char *io_names[] = { "input", "output" };
struct virtqueue *vqs[2];
int ret;
vcon = virtio_bind(VIRTIO_ID_CONSOLE);
if (vcon == NULL) {
printf("%s: %s: can't find a virtio-console\n",
__func__, TESTDEV_NAME);
return;
}
ret = vcon->config->find_vqs(vcon, 2, vqs, NULL, io_names);
if (ret < 0) {
printf("%s: %s: can't init virtqueues\n",
__func__, TESTDEV_NAME);
vcon = NULL;
return;
}
in_vq = vqs[0];
out_vq = vqs[1];
}