1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-02-25 GuEe-GUI the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "virtio.dev.rng"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <cpuport.h>
struct virtio_rng
{
struct rt_hwcrypto_device parent;
struct rt_virtio_device *vdev;
struct rt_virtqueue *vqs[1];
struct rt_spinlock lock;
};
static rt_uint32_t virtio_rng_rand(struct hwcrypto_rng *ctx)
{
rt_uint32_t rand;
struct rt_virtqueue *vq;
struct virtio_rng *vrng = rt_container_of(ctx->parent.device, struct virtio_rng, parent);
vq = vrng->vqs[0];
rt_virtqueue_wait_prepare(vq, 1);
rt_spin_lock(&vrng->lock);
rt_virtqueue_add_inbuf(vq, &rand, sizeof(rand));
rt_virtqueue_kick(vq);
while (!rt_virtqueue_read_buf(vq, RT_NULL))
{
rt_hw_cpu_relax();
}
rt_spin_unlock(&vrng->lock);
return rand;
}
static const struct hwcrypto_rng_ops rng_ops =
{
.update = virtio_rng_rand,
};
static rt_err_t virtio_rng_create(struct rt_hwcrypto_ctx *ctx)
{
if ((ctx->type & HWCRYPTO_MAIN_TYPE_MASK) == HWCRYPTO_TYPE_RNG)
{
struct hwcrypto_rng *rng;
ctx->contex = RT_NULL;
rng = rt_container_of(ctx, struct hwcrypto_rng, parent);
rng->ops = &rng_ops;
return RT_EOK;
}
return -RT_ENOSYS;
}
static void virtio_rng_destroy(struct rt_hwcrypto_ctx *ctx)
{
}
static rt_err_t virtio_rng_copy(struct rt_hwcrypto_ctx *des,
const struct rt_hwcrypto_ctx *src)
{
if ((src->type & HWCRYPTO_MAIN_TYPE_MASK) == HWCRYPTO_TYPE_RNG)
{
return RT_EOK;
}
return -RT_ENOSYS;
}
static void virtio_rng_reset(struct rt_hwcrypto_ctx *ctx)
{
}
static const struct rt_hwcrypto_ops virtio_rng_ops =
{
.create = virtio_rng_create,
.destroy = virtio_rng_destroy,
.copy = virtio_rng_copy,
.reset = virtio_rng_reset,
};
static void virtio_rng_done(struct rt_virtqueue *vq)
{
}
static rt_err_t virtio_rng_vq_init(struct virtio_rng *vrng)
{
const char *names[] =
{
"req",
};
rt_virtqueue_callback cbs[] =
{
&virtio_rng_done,
};
return rt_virtio_virtqueue_install(vrng->vdev, RT_ARRAY_SIZE(vrng->vqs),
vrng->vqs, names, cbs);
}
static void virtio_rng_vq_finit(struct virtio_rng *vrng)
{
if (vrng->vqs[0])
{
rt_virtio_virtqueue_release(vrng->vdev);
}
}
static rt_err_t virtio_rng_probe(struct rt_virtio_device *vdev)
{
rt_err_t err;
struct virtio_rng *vrng = rt_calloc(1, sizeof(*vrng));
if (!vrng)
{
return -RT_ENOMEM;
}
vdev->priv = vrng;
vrng->vdev = vdev;
vdev->parent.user_data = vrng;
if ((err = virtio_rng_vq_init(vrng)))
{
goto _fail;
}
rt_spin_lock_init(&vrng->lock);
vrng->parent.ops = &virtio_rng_ops;
vrng->parent.id = vdev->id.vendor;
if ((err = rt_hwcrypto_register(&vrng->parent, "hwrng")))
{
goto _fail;
}
return RT_EOK;
_fail:
virtio_rng_vq_finit(vrng);
rt_free(vrng);
return err;
}
static rt_err_t virtio_rng_remove(struct rt_virtio_device *vdev)
{
struct virtio_rng *vrng = vdev->parent.user_data;
rt_device_unregister(&vrng->parent.parent);
virtio_rng_vq_finit(vrng);
rt_free(vrng);
return RT_EOK;
}
static const struct rt_virtio_device_id virtio_rng_ids[] =
{
{ VIRTIO_DEVICE_ID_RNG, VIRTIO_DEVICE_ANY_ID },
{ /* sentinel */ }
};
static struct rt_virtio_driver virtio_rng_driver =
{
.ids = virtio_rng_ids,
.probe = virtio_rng_probe,
.remove = virtio_rng_remove,
};
RT_VIRTIO_DRIVER_EXPORT(virtio_rng_driver);
|
