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/* $OpenBSD: vrng.c,v 1.7 2021/10/24 17:05:04 mpi 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 <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 *);
const 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);
}
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