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genode/base-nova/include/nova/util.h

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NOVA: use cap_session to allocate portals
2012-08-08 12:23:13 +00:00
/*
* \brief Helper code used by core as base framework
* \author Alexander Boettcher
* \date 2012-08-08
*/
/*
Update copyright headers to 2013
2013-01-10 20:44:47 +00:00
* Copyright (C) 2012-2013 Genode Labs GmbH
NOVA: use cap_session to allocate portals
2012-08-08 12:23:13 +00:00
*
* 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>
NOVA: let thread die if SM cap is invalid Patch prevents following bugs: * In sleep_forever the thread return from semaphore down if cap is revoked during destruction of a thread. This causes an endless loop consuming time not available for other threads. * In lock_helper and cap_sel_alloc the thread return from the lock() method even if the semaphore down call failed because of an revoked semaphore. This lead to the situation that a thread subject to de-construction returns from the lock method, but not holding the lock, entering the critical section and modifying state inside the critical section. Another thread in parallel already in the critical section or entering the critical section also modifies the state. This lead to curious bugs ... * thread_nova, thread_start, irq_session Detect early bugs if the SM is gone unexpectedly where it should never happen.
2012-08-03 08:56:08 +00:00
__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.
NOVA: drop special utcb handling of main thread Unify handling of UTCBs. The utcb of the main thread is with commit ea38aad30e6166a0da1ac8bd84b53d6e1962cfaf at a fixed location - per convention. So we can remove all the ugly code to transfer the utcb address during process creation. To do so also the UTCB of the main thread of Core must be inside Genode's thread context area to handle it the same way. Unfortunately the UTCB of the main thread of Core can't be chosen, it is defined by the kernel. Possible solutions: - make virtual address of first thread UTCB configurable in hypervisor - map the utcb of the first thread inside Core to the desired location This commit implements the second option. Kernel patch: make utcb map-able With the patch the Utcb of the main thread of Core is map-able. Fixes #374 Noux actually uses the sp variable during thread creation and expects to be set accordingly. This wasn't the case for the main thread, it was ever set to the address of the main thread UTCB.
2012-09-28 10:24:14 +00:00
*/
while (1)
NOVA: let thread die if SM cap is invalid Patch prevents following bugs: * In sleep_forever the thread return from semaphore down if cap is revoked during destruction of a thread. This causes an endless loop consuming time not available for other threads. * In lock_helper and cap_sel_alloc the thread return from the lock() method even if the semaphore down call failed because of an revoked semaphore. This lead to the situation that a thread subject to de-construction returns from the lock method, but not holding the lock, entering the critical section and modifying state inside the critical section. Another thread in parallel already in the critical section or entering the critical section also modifies the state. This lead to curious bugs ... * thread_nova, thread_start, irq_session Detect early bugs if the SM is gone unexpectedly where it should never happen.
2012-08-03 08:56:08 +00:00
asm volatile ("ud2a" : : "a"(text));
}
Whitespace
2012-11-24 17:27:03 +00:00
nova: request native ec cap via pager Prerequisite to get rid of the base-nova special native_cap method in cpu_session. Vancouver/Seoul bootstrap code gets also much simpler. Issue #478
2013-09-25 09:53:49 +00:00
inline void request_event_portal(Genode::Native_capability const &cap,
Genode::addr_t sel, Genode::addr_t event,
nova: support requesting multiple event portals Enables us to request the exception handler portals at once instead each separately. Issue #478
2013-09-23 08:44:50 +00:00
unsigned short log2_count = 0)
NOVA: use cap_session to allocate portals
2012-08-08 12:23:13 +00:00
{
using namespace Nova;
Utcb *utcb = (Utcb *)Genode::Thread_base::myself()->utcb();
/* save original receive window */
Crd orig_crd = utcb->crd_rcv;
/* request event-handler portal */
nova: request native ec cap via pager Prerequisite to get rid of the base-nova special native_cap method in cpu_session. Vancouver/Seoul bootstrap code gets also much simpler. Issue #478
2013-09-25 09:53:49 +00:00
utcb->crd_rcv = Obj_crd(sel, log2_count);
NOVA: use cap_session to allocate portals
2012-08-08 12:23:13 +00:00
utcb->msg[0] = event;
nova: support requesting multiple event portals Enables us to request the exception handler portals at once instead each separately. Issue #478
2013-09-23 08:44:50 +00:00
utcb->msg[1] = log2_count;
utcb->set_msg_word(2);
NOVA: use cap_session to allocate portals
2012-08-08 12:23:13 +00:00
NOVA: let thread die if SM cap is invalid Patch prevents following bugs: * In sleep_forever the thread return from semaphore down if cap is revoked during destruction of a thread. This causes an endless loop consuming time not available for other threads. * In lock_helper and cap_sel_alloc the thread return from the lock() method even if the semaphore down call failed because of an revoked semaphore. This lead to the situation that a thread subject to de-construction returns from the lock method, but not holding the lock, entering the critical section and modifying state inside the critical section. Another thread in parallel already in the critical section or entering the critical section also modifies the state. This lead to curious bugs ... * thread_nova, thread_start, irq_session Detect early bugs if the SM is gone unexpectedly where it should never happen.
2012-08-03 08:56:08 +00:00
uint8_t res = call(cap.local_name());
NOVA: use cap_session to allocate portals
2012-08-08 12:23:13 +00:00
/* restore original receive window */
utcb->crd_rcv = orig_crd;
nova: create sm for signalling via pager The 'pause' call on base-nova assumes that a thread can solely block in its associated semaphore. Main reason is that so core can unblock a thread in order that the recall exception gets delivered and the register state can be obtained. Unfortunately the signal session implementation creates a semaphore, which is unknown by the pager code. Instead create the semaphore via the pager of the thread, so that the pager can unblock the signal thread when a pause is issued. Issue #478
2013-09-26 12:31:56 +00:00
if (res)
PERR("request of event (%lu) capability selector failed", event);
NOVA: use cap_session to allocate portals
2012-08-08 12:23:13 +00:00
}
nova: request native ec cap via pager Prerequisite to get rid of the base-nova special native_cap method in cpu_session. Vancouver/Seoul bootstrap code gets also much simpler. Issue #478
2013-09-25 09:53:49 +00:00
inline void request_native_ec_cap(Genode::Native_capability const &cap,
Genode::addr_t sel) {
nova: create sm for signalling via pager The 'pause' call on base-nova assumes that a thread can solely block in its associated semaphore. Main reason is that so core can unblock a thread in order that the recall exception gets delivered and the register state can be obtained. Unfortunately the signal session implementation creates a semaphore, which is unknown by the pager code. Instead create the semaphore via the pager of the thread, so that the pager can unblock the signal thread when a pause is issued. Issue #478
2013-09-26 12:31:56 +00:00
request_event_portal(cap, sel , ~0UL, 1); }
inline void request_signal_sm_cap(Genode::Native_capability const &cap,
Genode::addr_t sel) {
request_event_portal(cap, sel, ~0UL - 1, 0); }
nova: request native ec cap via pager Prerequisite to get rid of the base-nova special native_cap method in cpu_session. Vancouver/Seoul bootstrap code gets also much simpler. Issue #478
2013-09-25 09:53:49 +00:00
nova: support creation of vCPU in own PD With the patch a VMM is not forced anymore to co-located the VMM and VM in same PD. Fixes #949
2013-11-14 09:35:44 +00:00
inline void delegate_vcpu_portals(Genode::Native_capability const &cap,
Genode::addr_t sel)
{
using namespace Nova;
Utcb *utcb = reinterpret_cast<Utcb *>(Genode::Thread_base::myself()->utcb());
/* save original receive window */
Crd orig_crd = utcb->crd_rcv;
utcb->crd_rcv = Obj_crd();
utcb->set_msg_word(0);
uint8_t res = utcb->append_item(Obj_crd(sel, NUM_INITIAL_VCPU_PT_LOG2), 0);
(void)res;
res = call(cap.local_name());
/* restore original receive window */
utcb->crd_rcv = orig_crd;
if (res)
PERR("setting exception portals for vCPU failed %u", res);
}
NOVA: use cap_session to allocate portals
2012-08-08 12:23:13 +00:00
#endif /* _NOVA__INCLUDE__UTIL_H_ */
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