ARMIO.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 __LIBARCH_ARMIO_H
#define __LIBARCH_ARMIO_H
 
#include <Types.h>
#include <IO.h>
#include "ARMCore.h"
 
class ARMIO : public IO
{
  public:
 
    inline void write(u32 reg, u32 data)
    {
        dmb();
        u32 addr = reg + m_base;
        asm volatile("str %[data], [%[reg]]"
                 : : [reg]"r"(addr), [data]"r"(data));
        dmb();
    }
 
    inline u32 read(u32 reg) const
    {
        dmb();
        u32 addr = reg + m_base;
        u32 data;
        asm volatile("ldr %[data], [%[reg]]"
                 : [data]"=r"(data) : [reg]"r"(addr));
        dmb();
        return data;
    }
 
    inline void read(Address addr, Size count, void *buf) const
    {
        for (Size i = 0; i < count; i+= sizeof(u32))
        {
            *(u32 *)(((u8 *)buf) + i) = read(addr + i);
        }
    }
 
    inline void write(Address addr, Size count, const void *buf)
    {
        for (Size i = 0; i < count; i+= sizeof(u32))
        {
            write(addr + i, *(u32 *) (((u8 *)buf) + i));
        }
    }
 
    inline void set(Address addr, u32 data)
    {
        volatile u32 current = read(addr);
        current |= data;
        write(addr, current);
    }
 
    inline void unset(Address addr, u32 data)
    {
        volatile u32 current = read(addr);
        current &= ~(data);
        write(addr, current);
    }
};
 
namespace Arch
{
    typedef ARMIO IO;
};
 
#endif /* __LIBARCH_ARMIO_H */