genode/repos/base-nova/include/nova/util.h
2015-02-27 11:40:58 +01:00

117 lines
3.2 KiB
C

/*
* \brief Helper code used by core as base framework
* \author Alexander Boettcher
* \date 2012-08-08
*/
/*
* Copyright (C) 2012-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _NOVA__INCLUDE__UTIL_H_
#define _NOVA__INCLUDE__UTIL_H_
#include <base/printf.h>
#include <base/thread.h>
__attribute__((always_inline))
inline void nova_die(const char * text = 0)
{
/*
* If thread is de-constructed the sessions are already gone.
* Be careful when enabling printf here.
*/
while (1)
asm volatile ("ud2a" : : "a"(text));
}
inline void request_event_portal(Genode::Native_capability const &cap,
Genode::addr_t sel, Genode::addr_t event,
unsigned short log2_count = 0)
{
Genode::Thread_base * myself = Genode::Thread_base::myself();
Nova::Utcb *utcb = reinterpret_cast<Nova::Utcb *>(myself->utcb());
/* save original receive window */
Nova::Crd orig_crd = utcb->crd_rcv;
/* request event-handler portal */
utcb->crd_rcv = Nova::Obj_crd(sel, log2_count);
utcb->msg[0] = event;
utcb->msg[1] = log2_count;
utcb->set_msg_word(2);
Genode::uint8_t res = Nova::call(cap.local_name());
/* restore original receive window */
utcb->crd_rcv = orig_crd;
if (res)
PERR("request of event (%lu) capability selector failed", event);
}
inline void request_native_ec_cap(Genode::Native_capability const &cap,
Genode::addr_t const sel,
unsigned const no_pager_cap = 0)
{
request_event_portal(cap, sel , ~0UL, no_pager_cap);
}
inline void request_signal_sm_cap(Genode::Native_capability const &cap,
Genode::addr_t const sel)
{
request_event_portal(cap, sel, ~0UL - 1, 0);
}
inline void delegate_vcpu_portals(Genode::Native_capability const &cap,
Genode::addr_t const sel)
{
Genode::Thread_base * myself = Genode::Thread_base::myself();
Nova::Utcb *utcb = reinterpret_cast<Nova::Utcb *>(myself->utcb());
/* save original receive window */
Nova::Crd orig_crd = utcb->crd_rcv;
utcb->crd_rcv = Nova::Obj_crd();
Genode::uint8_t res = Nova::NOVA_OK;
enum {
TRANSLATE = true, THIS_PD = false, NON_GUEST = false, HOTSPOT = 0,
TRANSFER_ITEMS = 1U << (Nova::NUM_INITIAL_VCPU_PT_LOG2 - 1)
};
/* prepare translation items for every portal separately */
for (unsigned half = 0; !res && half < 2; half++) {
/* translate half of portals - due to size constraints on 64bit */
utcb->msg[0] = half;
utcb->set_msg_word(1);
/* add one translate item per portal */
for (unsigned i = 0; !res && i < TRANSFER_ITEMS; i++) {
Nova::Obj_crd obj_crd(sel + half * TRANSFER_ITEMS + i, 0);
if (!utcb->append_item(obj_crd, HOTSPOT, THIS_PD, NON_GUEST,
TRANSLATE))
res = 0xff;
}
if (res != Nova::NOVA_OK)
break;
/* trigger the translation */
res = Nova::call(cap.local_name());
}
/* restore original receive window */
utcb->crd_rcv = orig_crd;
if (res)
PERR("setting exception portals for vCPU failed %u", res);
}
#endif /* _NOVA__INCLUDE__UTIL_H_ */