IoPortManager.cc

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * 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 "pedigree/kernel/processor/IoPortManager.h"
#include "pedigree/kernel/LockGuard.h"
#include "pedigree/kernel/processor/IoPort.h"
#include "pedigree/kernel/processor/Processor.h"
#include "pedigree/kernel/utilities/new"

#if !defined(KERNEL_PROCESSOR_NO_PORT_IO)

IoPortManager IoPortManager::m_Instance;

bool IoPortManager::allocate(IoPort *Port, io_port_t ioPort, size_t size)
{
#if defined(ADDITIONAL_CHECKS)
    if (Processor::isInitialised() == 0)
        Processor::halt();
#endif

    // Acquire the lock untill the end of the function
    LockGuard<Spinlock> lock(m_Lock);

    // Remove the I/O ports from the list of free I/O ports
    if (m_FreeIoPorts.allocateSpecific(ioPort, size) == false)
        return false;

    // Add information to the list of used I/O ports
    m_UsedIoPorts.pushBack(Port);
    return true;
}

void IoPortManager::free(IoPort *Port)
{
#if defined(ADDITIONAL_CHECKS)
    if (Processor::isInitialised() == 0)
        Processor::halt();
#endif

    // Acquire the lock untill the end of the function
    LockGuard<Spinlock> lock(m_Lock);

    // Remove from the used I/O ports list
    Vector<IoPort *>::Iterator i = m_UsedIoPorts.begin();
    Vector<IoPort *>::Iterator end = m_UsedIoPorts.end();
    for (; i != end; i++)
        if ((*i) == Port)
        {
            m_UsedIoPorts.erase(i);
            break;
        }

    // Add to the free I/O ports list
    m_FreeIoPorts.free(Port->base(), Port->size());
}

void IoPortManager::allocateIoPortList(Vector<IoPortInfo *> &IoPorts)
{
    // Acquire the lock untill the end of the function
    LockGuard<Spinlock> lock(m_Lock);

    for (size_t i = 0; i < m_UsedIoPorts.count(); i++)
    {
        IoPortInfo *pIoPortInfo = new IoPortInfo(
            m_UsedIoPorts[i]->base(), m_UsedIoPorts[i]->size(),
            m_UsedIoPorts[i]->name());
        IoPorts.pushBack(pIoPortInfo);
    }
}

void IoPortManager::freeIoPortList(Vector<IoPortInfo *> &IoPorts)
{
    while (IoPorts.count() != 0)
    {
        IoPortInfo *pIoPortInfo = IoPorts.popBack();
        delete pIoPortInfo;
    }
}

//
// Functions only usable in the kernel initialisation phase
//

void IoPortManager::initialise(io_port_t ioPortBase, size_t size)
{
    m_FreeIoPorts.free(ioPortBase, size);
}

IoPortManager::IoPortManager() : m_Lock(), m_FreeIoPorts(), m_UsedIoPorts()
{
}
IoPortManager::~IoPortManager()
{
}

#endif