C++ restore_interrupts函数代码示例

status_t
get_sem_count(sem_id id, int32 *_count)
{
	int slot;
	int state;

	if (sSemsActive == false)
		return B_NO_MORE_SEMS;
	if (id < 0)
		return B_BAD_SEM_ID;
	if (_count == NULL)
		return B_BAD_VALUE;

	slot = id % sMaxSems;

	state = disable_interrupts();
	GRAB_SEM_LOCK(sSems[slot]);

	if (sSems[slot].id != id) {
		RELEASE_SEM_LOCK(sSems[slot]);
		restore_interrupts(state);
		TRACE(("sem_get_count: invalid sem_id %ld\n", id));
		return B_BAD_SEM_ID;
	}

	*_count = sSems[slot].u.used.count;

	RELEASE_SEM_LOCK(sSems[slot]);
	restore_interrupts(state);

	return B_OK;
}

/*
 * softintr_dispatch:
 *
 *	Process pending software interrupts on the specified queue.
 *
 *	NOTE: We must already be at the correct interrupt priority level.
 */
void
softintr_dispatch(int si)
{
	struct soft_intrq *siq = &soft_intrq[si];
	struct soft_intrhand *sih;
	int oldirqstate;

	siq->siq_evcnt.ev_count++;
	for (;;) {
		oldirqstate = disable_interrupts(I32_bit);
		sih = TAILQ_FIRST(&siq->siq_list);
		if (sih == NULL) {
			restore_interrupts(oldirqstate);
			break;
		}

		TAILQ_REMOVE(&siq->siq_list, sih, sih_list);
		sih->sih_pending = 0;

		uvmexp.softs++;

		restore_interrupts(oldirqstate);

		(*sih->sih_func)(sih->sih_arg);
	}
}

/*!	Finds a free message and gets it.
	NOTE: has side effect of disabling interrupts
	return value is the former interrupt state
*/
static cpu_status
find_free_message(struct smp_msg** msg)
{
	cpu_status state;

	TRACE(("find_free_message: entry\n"));

retry:
	while (sFreeMessageCount <= 0) {
		state = disable_interrupts();
		process_all_pending_ici(smp_get_current_cpu());
		restore_interrupts(state);
		PAUSE();
	}
	state = disable_interrupts();
	acquire_spinlock(&sFreeMessageSpinlock);

	if (sFreeMessageCount <= 0) {
		// someone grabbed one while we were getting the lock,
		// go back to waiting for it
		release_spinlock(&sFreeMessageSpinlock);
		restore_interrupts(state);
		goto retry;
	}

	*msg = sFreeMessages;
	sFreeMessages = (*msg)->next;
	sFreeMessageCount--;

	release_spinlock(&sFreeMessageSpinlock);

	TRACE(("find_free_message: returning msg %p\n", *msg));

	return state;
}

int32
tx_cleanup_thread(void *us)
{
	PLM_PACKET pPacket;
	PLM_DEVICE_BLOCK pDevice = (PLM_DEVICE_BLOCK)(us);
	struct be_b57_dev *pUmDevice = (struct be_b57_dev *)(us);
	struct B_UM_PACKET *pUmPacket;
	cpu_status cpu;

	while (1) {
		cpu = disable_interrupts();
		acquire_spinlock(&pUmDevice->lock);

		pPacket = (PLM_PACKET)
			QQ_PopHead(&pDevice->TxPacketXmittedQ.Container);

		release_spinlock(&pUmDevice->lock);
		restore_interrupts(cpu);
		if (pPacket == 0)
			break;
		pUmPacket = (struct B_UM_PACKET *)(pPacket);
		chunk_pool_put(pUmPacket->data);
		pUmPacket->data = NULL;

		cpu = disable_interrupts();
		acquire_spinlock(&pUmDevice->lock);
		QQ_PushTail(&pDevice->TxPacketFreeQ.Container, pPacket);
		release_spinlock(&pUmDevice->lock);
		restore_interrupts(cpu);
	}
	return LM_STATUS_SUCCESS;
}

void
midi_interrupt_op(
	int32 op,
	void * data)
{
	midi_dev * port = (midi_dev *)data;
	ddprintf(("port = %p\n", port));
	if (op == B_MPU_401_ENABLE_CARD_INT) {
		cpu_status cp;
		ddprintf(("cmedia_pci: B_MPU_401_ENABLE_CARD_INT\n"));
		cp = disable_interrupts();
		acquire_spinlock(&port->card->hardware);
		increment_interrupt_handler(port->card);
		set_direct(port->card, 0x01, 0x00, 0x80);
		set_indirect(port->card, 0x2A, 0x04, 0xff);
		release_spinlock(&port->card->hardware);
		restore_interrupts(cp);
	}
	else if (op == B_MPU_401_DISABLE_CARD_INT) {
		/* turn off MPU interrupts */
		cpu_status cp;
		ddprintf(("cmedia_pci: B_MPU_401_DISABLE_CARD_INT\n"));
		cp = disable_interrupts();
		acquire_spinlock(&port->card->hardware);
		set_direct(port->card, 0x01, 0x80, 0x80);
		/* remove interrupt handler if necessary */
		decrement_interrupt_handler(port->card);
		release_spinlock(&port->card->hardware);
		restore_interrupts(cp);
	}
	ddprintf(("cmedia_pci: midi_interrupt_op() done\n"));
}

static status_t
b57_read(void *cookie,off_t pos,void *data,size_t *numBytes)
{
	struct be_b57_dev *pUmDevice = (struct be_b57_dev *)cookie;
	PLM_DEVICE_BLOCK pDevice = (PLM_DEVICE_BLOCK) pUmDevice;
	PLM_PACKET pPacket;
	struct B_UM_PACKET *pUmPacket;
	cpu_status cpu;

	if (pUmDevice->block)
		acquire_sem(pUmDevice->packet_release_sem);
	else {
		/* Decrement the receive sem anyway, but don't block
		   this is a horrible hack, but it works. */
		acquire_sem_etc(pUmDevice->packet_release_sem, 1, B_RELATIVE_TIMEOUT, 0);
	}

	cpu = disable_interrupts();
	acquire_spinlock(&pUmDevice->lock);

	pPacket = (PLM_PACKET)
		QQ_PopHead(&pUmDevice->RxPacketReadQ.Container);

	release_spinlock(&pUmDevice->lock);
	restore_interrupts(cpu);

	if (pPacket == 0) {
		*numBytes = -1;
		return B_ERROR;
	}

	pUmPacket = (struct B_UM_PACKET *) pPacket;
	if (pPacket->PacketStatus != LM_STATUS_SUCCESS
		|| pPacket->PacketSize > 1518) {
		cpu = disable_interrupts();
		acquire_spinlock(&pUmDevice->lock);

		QQ_PushTail(&pDevice->RxPacketFreeQ.Container, pPacket);

		release_spinlock(&pUmDevice->lock);
		restore_interrupts(cpu);
		*numBytes = -1;
		return B_ERROR;
	}

	if ((pPacket->PacketSize) < *numBytes)
		*numBytes = pPacket->PacketSize;

	memcpy(data,pUmPacket->data,*numBytes);
	cpu = disable_interrupts();
	acquire_spinlock(&pUmDevice->lock);

	QQ_PushTail(&pDevice->RxPacketFreeQ.Container, pPacket);

	release_spinlock(&pUmDevice->lock);
	restore_interrupts(cpu);

	return B_OK;
}

void
smp_send_ici(int32 targetCPU, int32 message, addr_t data, addr_t data2,
	addr_t data3, void* dataPointer, uint32 flags)
{
	struct smp_msg *msg;

	TRACE(("smp_send_ici: target 0x%lx, mess 0x%lx, data 0x%lx, data2 0x%lx, "
		"data3 0x%lx, ptr %p, flags 0x%lx\n", targetCPU, message, data, data2,
		data3, dataPointer, flags));

	if (sICIEnabled) {
		int state;
		int currentCPU;

		// find_free_message leaves interrupts disabled
		state = find_free_message(&msg);

		currentCPU = smp_get_current_cpu();
		if (targetCPU == currentCPU) {
			return_free_message(msg);
			restore_interrupts(state);
			return; // nope, cant do that
		}

		// set up the message
		msg->message = message;
		msg->data = data;
		msg->data2 = data2;
		msg->data3 = data3;
		msg->data_ptr = dataPointer;
		msg->ref_count = 1;
		msg->flags = flags;
		msg->done = false;

		// stick it in the appropriate cpu's mailbox
		acquire_spinlock_nocheck(&sCPUMessageSpinlock[targetCPU]);
		msg->next = sCPUMessages[targetCPU];
		sCPUMessages[targetCPU] = msg;
		release_spinlock(&sCPUMessageSpinlock[targetCPU]);

		arch_smp_send_ici(targetCPU);

		if ((flags & SMP_MSG_FLAG_SYNC) != 0) {
			// wait for the other cpu to finish processing it
			// the interrupt handler will ref count it to <0
			// if the message is sync after it has removed it from the mailbox
			while (msg->done == false) {
				process_all_pending_ici(currentCPU);
				PAUSE();
			}
			// for SYNC messages, it's our responsibility to put it
			// back into the free list
			return_free_message(msg);
		}

		restore_interrupts(state);
	}
}

static status_t
delete_sem_internal(sem_id id, bool checkPermission)
{
	if (sSemsActive == false)
		return B_NO_MORE_SEMS;
	if (id < 0)
		return B_BAD_SEM_ID;

	int32 slot = id % sMaxSems;

	cpu_status state = disable_interrupts();
	GRAB_SEM_LIST_LOCK();
	GRAB_SEM_LOCK(sSems[slot]);

	if (sSems[slot].id != id) {
		RELEASE_SEM_LOCK(sSems[slot]);
		RELEASE_SEM_LIST_LOCK();
		restore_interrupts(state);
		TRACE(("delete_sem: invalid sem_id %ld\n", id));
		return B_BAD_SEM_ID;
	}

	if (checkPermission
		&& sSems[slot].u.used.owner == team_get_kernel_team_id()) {
		RELEASE_SEM_LOCK(sSems[slot]);
		RELEASE_SEM_LIST_LOCK();
		restore_interrupts(state);
		dprintf("thread %ld tried to delete kernel semaphore %ld.\n",
			thread_get_current_thread_id(), id);
		return B_NOT_ALLOWED;
	}

	if (sSems[slot].u.used.owner >= 0) {
		list_remove_link(&sSems[slot].u.used.team_link);
		sSems[slot].u.used.owner = -1;
	} else
		panic("sem %ld has no owner", id);

	RELEASE_SEM_LIST_LOCK();

	char* name;
	uninit_sem_locked(sSems[slot], &name);

	SpinLocker schedulerLocker(gSchedulerLock);
	scheduler_reschedule_if_necessary_locked();
	schedulerLocker.Unlock();

	restore_interrupts(state);

	free(name);
	return B_OK;
}

status_t
deselect_sem(int32 id, struct select_info* info, bool kernel)
{
	cpu_status state;
	int32 slot;

	if (id < 0)
		return B_BAD_SEM_ID;

	if (info->selected_events == 0)
		return B_OK;

	slot = id % sMaxSems;

	state = disable_interrupts();
	GRAB_SEM_LOCK(sSems[slot]);

	if (sSems[slot].id == id) {
		select_info** infoLocation = &sSems[slot].u.used.select_infos;
		while (*infoLocation != NULL && *infoLocation != info)
			infoLocation = &(*infoLocation)->next;

		if (*infoLocation == info)
			*infoLocation = info->next;
	}

	RELEASE_SEM_LOCK(sSems[slot]);
	restore_interrupts(state);

	return B_OK;
}

static int
omaprtc_settime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
	struct omaprtc_softc *sc = tch->cookie;
	int s;

	s = disable_interrupts(I32_bit);

	while (rtc_is_busy()) {
		;
	}

	/* It's ok to write these without stopping the
	 * RTC, because the BUSY mechanism lets us guarantee
	 * that we're not in the middle of, e.g., rolling
	 * seconds into minutes.
	 */

	bus_space_write_1(sc->sc_iot, sc->sc_ioh,
			  YEARS_REG, TOBCD(dt->dt_year - BASEYEAR));
	bus_space_write_1(sc->sc_iot, sc->sc_ioh,
			  MONTHS_REG, TOBCD(dt->dt_mon));
	bus_space_write_1(sc->sc_iot, sc->sc_ioh,
			  WEEKS_REG, TOBCD(dt->dt_wday & 0x0f));
	bus_space_write_1(sc->sc_iot, sc->sc_ioh,
			  DAYS_REG, TOBCD(dt->dt_day));
	bus_space_write_1(sc->sc_iot, sc->sc_ioh,
			  SECONDS_REG, TOBCD(dt->dt_sec));
	bus_space_write_1(sc->sc_iot, sc->sc_ioh,
			  HOURS_REG, TOBCD(dt->dt_hour));
	bus_space_write_1(sc->sc_iot, sc->sc_ioh,
			  MINUTES_REG, TOBCD(dt->dt_min));
	restore_interrupts(s);
        return 0;
}

/* kmode function for kprintf
*/
int kmode(int m)
{
	if ( m == KPOLLED )
		return(disable_interrupts());
	else
		return(restore_interrupts(m));
}

void
arch_smp_send_ici(int32 target_cpu)
{
	uint32 config;
	uint32 timeout;
	cpu_status state;

	state = disable_interrupts();

	config = apic_read(APIC_INTR_COMMAND_2) & APIC_INTR_COMMAND_2_MASK;
	apic_write(APIC_INTR_COMMAND_2, config | sCPUAPICIds[target_cpu] << 24);

	config = apic_read(APIC_INTR_COMMAND_1) & APIC_INTR_COMMAND_1_MASK;
	apic_write(APIC_INTR_COMMAND_1, config | 0xfd | APIC_DELIVERY_MODE_FIXED
		| APIC_INTR_COMMAND_1_ASSERT
		| APIC_INTR_COMMAND_1_DEST_MODE_PHYSICAL
		| APIC_INTR_COMMAND_1_DEST_FIELD);

	timeout = 100000000;
	// wait for message to be sent
	while ((apic_read(APIC_INTR_COMMAND_1) & APIC_DELIVERY_STATUS) != 0 && --timeout != 0)
		asm volatile ("pause;");

	if (timeout == 0)
		panic("arch_smp_send_ici: timeout, target_cpu %" B_PRId32, target_cpu);

	restore_interrupts(state);
}

/*!	Called by the get_sem_info() macro. */
status_t
_get_sem_info(sem_id id, struct sem_info *info, size_t size)
{
	status_t status = B_OK;
	int state;
	int slot;

	if (!sSemsActive)
		return B_NO_MORE_SEMS;
	if (id < 0)
		return B_BAD_SEM_ID;
	if (info == NULL || size != sizeof(sem_info))
		return B_BAD_VALUE;

	slot = id % sMaxSems;

	state = disable_interrupts();
	GRAB_SEM_LOCK(sSems[slot]);

	if (sSems[slot].id != id) {
		status = B_BAD_SEM_ID;
		TRACE(("get_sem_info: invalid sem_id %ld\n", id));
	} else
		fill_sem_info(&sSems[slot], info, size);

	RELEASE_SEM_LOCK(sSems[slot]);
	restore_interrupts(state);

	return status;
}

status_t
delete_timer(timer_id id)
{
	cpu_status cpu;
	bool deleted;
	int i;

	deleted = false;
	
	cpu = disable_interrupts();
	acquire_spinlock(&sTimerSpinlock);
	
	for (i = 0; i < sTimerCount; i++) {
		if (sTimerData[i].id == id) {
			if (i != (sTimerCount - 1) && sTimerCount != 1) {
				memcpy(&sTimerData[i], &sTimerData[sTimerCount - 1], sizeof(struct timer_info));
			}
			sTimerCount--;
			deleted = true;
			break;
		}
	}
	
	release_spinlock(&sTimerSpinlock);
	restore_interrupts(cpu);

	if (!deleted)
		return B_ERROR;
		
	release_sem_etc(sTimerSem, 1, B_DO_NOT_RESCHEDULE);
	return B_OK;
}

void
X86PagingStructures32Bit::Init(page_directory_entry* virtualPageDir,
	phys_addr_t physicalPageDir, page_directory_entry* kernelPageDir)
{
	pgdir_virt = virtualPageDir;
	pgdir_phys = physicalPageDir;

	// zero out the bottom portion of the new pgdir
	memset(pgdir_virt + FIRST_USER_PGDIR_ENT, 0,
		NUM_USER_PGDIR_ENTS * sizeof(page_directory_entry));

	// insert this new map into the map list
	{
		int state = disable_interrupts();
		acquire_spinlock(&sPagingStructuresListLock);

		// copy the top portion of the page dir from the kernel page dir
		if (kernelPageDir != NULL) {
			memcpy(pgdir_virt + FIRST_KERNEL_PGDIR_ENT,
				kernelPageDir + FIRST_KERNEL_PGDIR_ENT,
				NUM_KERNEL_PGDIR_ENTS * sizeof(page_directory_entry));
		}

		sPagingStructuresList.Add(this);

		release_spinlock(&sPagingStructuresListLock);
		restore_interrupts(state);
	}
}