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
|
/* $OpenBSD: vrng.c,v 1.5 2018/04/28 15:44:59 jasper Exp $ */
/*
* Copyright (c) 2008 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/timeout.h>
#include <uvm/uvm_extern.h>
#include <machine/autoconf.h>
#include <machine/hypervisor.h>
#include <machine/openfirm.h>
#include <machine/sparc64.h>
#define HSVC_GROUP_RNG 0x104
#include <dev/rndvar.h>
#include <sparc64/dev/vbusvar.h>
struct rng_ctl {
uint64_t rng_res : 39;
uint64_t rng_wait_cnt : 16;
uint64_t rng_bypass : 1;
uint64_t rng_vcoctl_sel : 2;
uint64_t rng_anlg_sel : 2;
uint64_t rng_ctl4 : 1;
uint64_t rng_ctl3 : 1;
uint64_t rng_ctl2 : 1;
uint64_t rng_ctl1 : 1;
};
struct vrng_softc {
struct device sc_dv;
struct timeout sc_to;
int sc_count;
};
int vrng_match(struct device *, void *, void *);
void vrng_attach(struct device *, struct device *, void *);
struct cfattach vrng_ca = {
sizeof(struct vrng_softc), vrng_match, vrng_attach
};
struct cfdriver vrng_cd = {
NULL, "vrng", DV_DULL
};
void vrng_rnd(void *);
int
vrng_match(struct device *parent, void *match, void *aux)
{
struct vbus_attach_args *va = aux;
if (strcmp(va->va_name, "random-number-generator") == 0)
return (1);
return (0);
}
void
vrng_attach(struct device *parent, struct device *self, void *aux)
{
struct vrng_softc *sc = (void *)self;
uint64_t supported_minor;
struct rng_ctl ctl[4];
uint64_t delta;
paddr_t addr;
int err;
if (prom_set_sun4v_api_version(HSVC_GROUP_RNG, 1, 0, &supported_minor))
printf(": unsupported hypervisor\n");
err = hv_rng_get_diag_control();
if (err != H_EOK && err != H_ENOACCESS)
printf(": hv_rng_get_diag_control %d\n", err);
/*
* If we're not the Trusted Domain, the hypervisor call above
* will fails with H_ENOACCESS. In that case we hope that the
* RNG has been properly initialized.
*/
if (err == H_EOK) {
bzero(ctl, sizeof(ctl));
ctl[0].rng_ctl1 = 1;
ctl[0].rng_vcoctl_sel = 0;
ctl[0].rng_wait_cnt = 0x3e;
ctl[1].rng_ctl2 = 1;
ctl[1].rng_vcoctl_sel = 1;
ctl[1].rng_wait_cnt = 0x3e;
ctl[2].rng_ctl3 = 1;
ctl[2].rng_vcoctl_sel = 2;
ctl[2].rng_wait_cnt = 0x3e;
ctl[3].rng_ctl1 = 1;
ctl[3].rng_ctl2 = 1;
ctl[3].rng_ctl3 = 1;
ctl[3].rng_ctl4 = 1;
ctl[3].rng_wait_cnt = 0x3e;
if (!pmap_extract(pmap_kernel(), (vaddr_t)&ctl, &addr))
panic("vrng_attach: pmap_extract failed");
err = hv_rng_ctl_write(addr, RNG_STATE_CONFIGURED, 0, &delta);
if (err != H_EOK)
printf(": hv_rng_ctl_write %d\n", err);
}
printf("\n");
timeout_set(&sc->sc_to, vrng_rnd, sc);
vrng_rnd(sc);
}
void
vrng_rnd(void *v)
{
struct vrng_softc *sc = v;
uint64_t rnd;
uint64_t delta;
paddr_t addr;
int err;
if (!pmap_extract(pmap_kernel(), (vaddr_t)&rnd, &addr))
panic("vrng_rnd: pmap_extract failed");
err = hv_rng_data_read(addr, &delta);
if (err == H_EOK) {
#if 0
if ((sc->sc_count++ % 100) == 0)
printf("vrng: %lx\n", rnd);
#endif
enqueue_randomness(rnd);
enqueue_randomness(rnd >> 32);
}
if (err != H_EOK && err != H_EWOULDBLOCK)
printf("vrng_rnd: err = %d\n", err);
else
timeout_add(&sc->sc_to, 1);
}
|
