/*
 * Copyright 1997 by UCHIYAMA Yasushi
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of UCHIYAMA Yasushi not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  UCHIYAMA Yasushi makes no representations
 * about the suitability of this software for any purpose.  It is provided
 * "as is" without express or implied warranty.
 *
 * UCHIYAMA YASUSHI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL UCHIYAMA YASUSHI BE LIABLE FOR ANY SPECIAL, 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.
 *
 */
/* $XFree86$ */
#include<mach.h>
#include<device/device.h>

#include "X.h"

#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"

#define BIOS_SIZE 0x20000

int 
xf86ReadBIOS(unsigned long Base,unsigned long Offset,unsigned char *Buf,int Len)
{
    mach_port_t device,iopl_dev;
    memory_object_t iopl_mem;
    vm_address_t addr = (vm_address_t)0; /* serach starting address */
    kern_return_t err;


    err = get_privileged_ports (NULL, &device);
    if( err )
    {
	errno = err;
	FatalError("xf86ReadBIOS() can't get_privileged_ports. (%s)\n",strerror(errno));
    }
    err = device_open(device,D_READ|D_WRITE,"iopl",&iopl_dev);
    mach_port_deallocate (mach_task_self (), device);
    if( err )
    {
	errno = err;
	FatalError("xf86ReadBIOS() can't device_open. (%s)\n",strerror(errno));
    }
    err = device_map(iopl_dev,VM_PROT_READ|VM_PROT_WRITE, Base , BIOS_SIZE ,&iopl_mem,0);
    if( err )
    {
	errno = err;
	FatalError("xf86ReadBIOS() can't device_map. (%s)\n",strerror(errno));
    }
    err = vm_map(mach_task_self(),
		 &addr,
		 BIOS_SIZE,
		 0,
		 TRUE,
		 iopl_mem,
		 Base,
		 FALSE,
		 VM_PROT_READ|VM_PROT_WRITE,
		 VM_PROT_READ|VM_PROT_WRITE,
		 VM_INHERIT_SHARE);
    mach_port_deallocate(mach_task_self(),iopl_mem);
    if( err )
    {
	errno = err;
	FatalError("xf86ReadBIOS() can't vm_map. (%s)\n",strerror(errno));
    }

    memcpy(Buf,(void*)((int)addr + Offset), Len);
    
    err = vm_deallocate(mach_task_self(), addr, BIOS_SIZE);
    if( err )
    {
	errno = err;
	FatalError("xf86ReadBIOS() can't vm_deallocate. (%s)\n",strerror(errno));
    }
    
    return Len;
}
