Ejemplo n.º 1
0
int
xb_read(void *data, unsigned len)
{
	struct xenstore_domain_interface *intf = xenstore_domain_interface();
	XENSTORE_RING_IDX cons, prod;

	int s = spltty();

	while (len != 0) {
		unsigned int avail;
		const char *src;

		while (intf->rsp_cons == intf->rsp_prod)
			tsleep(&xenstore_interface, PRIBIO, "rdst", 0);

		/* Read indexes, then verify. */
		cons = intf->rsp_cons;
		prod = intf->rsp_prod;
		xen_rmb();
		if (!check_indexes(cons, prod)) {
			XENPRINTF(("xb_read EIO\n"));
			splx(s);
			return EIO;
		}

		src = get_input_chunk(cons, prod, intf->rsp, &avail);
		if (avail == 0)
			continue;
		if (avail > len)
			avail = len;

		/* We must read header before we read data. */
		xen_rmb();

		memcpy(data, src, avail);
		data = (char *)data + avail;
		len -= avail;

		/* Other side must not see free space until we've copied out */
		xen_rmb();
		intf->rsp_cons += avail;
		xen_rmb();

		XENPRINTF(("Finished read of %i bytes (%i to go)\n",
		    avail, len));

		hypervisor_notify_via_evtchn(xen_start_info.store_evtchn);
	}

	splx(s);
	return 0;
}
Ejemplo n.º 2
0
int
xb_write(const void *data, unsigned len)
{
	struct xenstore_domain_interface *intf = xenstore_domain_interface();
	XENSTORE_RING_IDX cons, prod;

	int s = spltty();

	while (len != 0) {
		void *dst;
		unsigned int avail;

		while ((intf->req_prod - intf->req_cons) == XENSTORE_RING_SIZE) {
			XENPRINTF(("xb_write tsleep\n"));
			tsleep(&xenstore_interface, PRIBIO, "wrst", 0);
			XENPRINTF(("xb_write tsleep done\n"));
		}

		/* Read indexes, then verify. */
		cons = intf->req_cons;
		prod = intf->req_prod;
		xen_rmb();
		if (!check_indexes(cons, prod)) {
			splx(s);
			return EIO;
		}

		dst = get_output_chunk(cons, prod, intf->req, &avail);
		if (avail == 0)
			continue;
		if (avail > len)
			avail = len;

		memcpy(dst, data, avail);
		data = (const char *)data + avail;
		len -= avail;

		/* Other side must not see new header until data is there. */
		xen_rmb();
		intf->req_prod += avail;
		xen_rmb();

		hypervisor_notify_via_evtchn(xen_start_info.store_evtchn);
	}

	splx(s);
	return 0;
}
Ejemplo n.º 3
0
void
xen_set_ldt(vaddr_t base, uint32_t entries)
{
	vaddr_t va;
	vaddr_t end;
	pt_entry_t *ptp;
	int s;

#ifdef __x86_64__
	end = base + (entries << 3);
#else
	end = base + entries * sizeof(union descriptor);
#endif

	for (va = base; va < end; va += PAGE_SIZE) {
		KASSERT(va >= VM_MIN_KERNEL_ADDRESS);
		ptp = kvtopte(va);
		XENPRINTF(("xen_set_ldt %#" PRIxVADDR " %d %p\n",
		    base, entries, ptp));
		pmap_pte_clearbits(ptp, PG_RW);
	}
	s = splvm();
	xpq_queue_set_ldt(base, entries);
	splx(s);
}