root / Whitix / branches / hybrid / devices / misc.c

/*  This file is part of Whitix.
 *
 *  Whitix 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  Whitix 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 Whitix; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <fs/vfs.h>
#include <fs/devfs.h>
#include <typedefs.h>
#include <init.h>
#include <i386/i386.h>
#include <i386/virtual.h>

#define MISC_MAJOR 2

static int ZeroRead(struct File* file,BYTE* data,DWORD size)
{
        ZeroMemory(data,size);
        return size;
}

static int ZeroMemoryMap(struct VNode* vNode, DWORD address, DWORD offset)
{
        ZeroMemory(address, PAGE_SIZE);
        return 0;
}

static int NullWrite(struct File* file,BYTE* data,DWORD size)
{
        return size;
}

static int MemMemoryMap(struct VNode* vNode, DWORD address, DWORD offset)
{
//      printf("Mapping %#X to %#X\n", address, offset);
        VirtMemMapPage(address, offset, PAGE_USER | PAGE_RW | PAGE_PRESENT);
        return 0;
}

struct FileOps nullOps={
        .write = NullWrite,
};

struct FileOps zeroOps={
        .read = ZeroRead,
        .mMap = ZeroMemoryMap,
};

struct FileOps memOps={
        .mMap = MemMemoryMap,
};

int MiscInit()
{
        DevAddDevice("Special/Null",MISC_MAJOR,0,DEVICE_CHAR,&nullOps);
        DevAddDevice("Special/Zero",MISC_MAJOR,1,DEVICE_CHAR,&zeroOps);
        DevAddDevice("Special/Memory",MISC_MAJOR,2,DEVICE_CHAR,&memOps);

        return 0;
}

DeviceInit(MiscInit);