ProcessShares.h

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/*
 * Copyright (C) 2015 Niek Linnenbank
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef __KERNEL_PROCESSSHARES_H
#define __KERNEL_PROCESSSHARES_H
 
#include <Types.h>
#include <Macros.h>
#include <List.h>
#include <MemoryMap.h>
#include <Index.h>
 
class MemoryChannel;
class MemoryContext;
class Process;
 
class ProcessShares
{
  private:
 
    static const Size MaximumMemoryShares = 32u;
 
  public:
 
    struct MemoryShare
    {
        ProcessID pid;
 
        Size coreId;
 
        Size tagId;
 
        Memory::Range range;
 
        bool attached;
    };
 
    enum Result
    {
        Success,
        InvalidArgument,
        MemoryMapError,
        OutOfMemory,
        AlreadyExists,
        DetachInProgress,
        NotFound
    };
 
    ProcessShares(ProcessID pid);
 
    virtual ~ProcessShares();
 
    const ProcessID getProcessID() const;
 
    MemoryContext * getMemoryContext();
 
    Result setMemoryContext(MemoryContext *context);
 
    Result createShare(ProcessShares & instance,
                       MemoryShare *share);
 
    Result createShare(ProcessID pid,
                       Size coreId,
                       Size tagId,
                       Address virt,
                       Size size);
 
    Result readShare(MemoryShare *share);
 
    Result removeShares(ProcessID pid);
 
  private:
 
    Result releaseShare(MemoryShare *share, Size idx);
 
    MemoryShare * findShare(const ProcessID pid,
                            const Size coreId,
                            const Size tagId);
 
  private:
 
    ProcessID m_pid;
 
    MemoryContext *m_memory;
 
    Index<MemoryShare, MaximumMemoryShares> m_shares;
};
 
#endif /* __KERNEL_PROCESSSHARES_H */