dha.c

来自「君正早期ucos系统(只有早期的才不没有打包成库),MPLAYER,文件系统,图」· C语言 代码 · 共 219 行

/*
 * VIDIX Direct Hardware Access (DHA).
 * Copyright (C) 2002 Nick Kurshev
 *
 * This file is part of MPlayer.
 *
 * MPlayer 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.
 *
 * MPlayer 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 MPlayer; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 *   1996/10/27	- Robin Cutshaw ([e-mail])
 *		  XFree86 3.3.3 implementation
 *   1999	- Øyvind Aabling.
 *   		  Modified for GATOS/win/gfxdump.
 *		  
 *   2002	- library implementation by Nick Kurshev
 *		- dhahelper and some changes by Alex Beregszaszi
 *   
 *   Supported O/S's:	SVR4, UnixWare, SCO, Solaris,
 *			FreeBSD, NetBSD, 386BSD, BSDI BSD/386,
 *			Linux, Mach/386, ISC
 *			DOS (WATCOM 9.5 compiler), Win9x (with mapdev.vxd)
 *   Original location: www.linuxvideo.org/gatos
 */

#include "config.h"

#include "dha.h"
#include "AsmMacros.h"
#include <mplaylib.h>
#include <mplaylib.h>
#include <mplaylib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef ARCH_ALPHA
#include <sys/io.h>
#endif
#include <mplaylib.h>

#if defined(WIN32)
#include "sysdep/libdha_win32.c"
#elif defined (__EMX__)
#include "sysdep/libdha_os2.c"
#else

#if defined(SVR4) || defined(SCO325)
#  if !(defined(sun) && defined (i386) && defined (SVR4))
#    define DEV_MEM "/dev/pmem"
#  elif defined(PowerMAX_OS)
#    define DEV_MEM "/dev/iomem"
#  endif
#  ifdef SCO325
#   undef DEV_MEM
#   define DEV_MEM "/dev/mem"
#  endif
#elif defined(sun) && defined (i386)
#define DEV_MEM "/dev/xsvc"
# endif /* SVR4 */

#if defined(__OpenBSD__)
#define DEV_APERTURE "/dev/xf86"
#endif

/* Generic version */
#include <sys/mman.h>

#ifndef DEV_MEM
#define DEV_MEM "/dev/mem"
#endif

#ifdef CONFIG_DHAHELPER
#include "kernelhelper/dhahelper.h"
#endif

#ifdef CONFIG_SVGAHELPER
#include <svgalib_helper.h>
#endif

static int mem_fd = -1;

void *map_phys_mem(unsigned long base, unsigned long size)
{    
#ifdef ARCH_ALPHA
/* TODO: move it into sysdep */
  base += bus_base();
#endif

#ifdef CONFIG_SVGAHELPER
  if ( (mem_fd = open(DEV_SVGA,O_RDWR)) == -1) {
      perror("libdha: SVGAlib kernelhelper failed");
#ifdef CONFIG_DHAHELPER
      goto dha_helper_way;
#else
      goto dev_mem_way;
#endif
  }
  else
      goto mmap;
#endif

#ifdef CONFIG_DHAHELPER
#ifdef CONFIG_SVGAHELPER
dha_helper_way:
#endif
  if ( (mem_fd = open("/dev/dhahelper",O_RDWR)) < 0)
  {
      perror("libdha: DHA kernelhelper failed");
      goto dev_mem_way;
  }
  else
  {
    dhahelper_memory_t mem_req;
    
    mem_req.operation = MEMORY_OP_MAP;
    mem_req.start = base;
    mem_req.offset = 0;
    mem_req.size = size;
    
    if (ioctl(mem_fd, DHAHELPER_MEMORY, &mem_req) < 0)
    {
	perror("libdha: DHA kernelhelper failed");
	close(mem_fd);
	goto dev_mem_way;
    }
    else
	goto mmap;
  }
#endif

#if defined(CONFIG_DHAHELPER) || defined (CONFIG_SVGAHELPER)
dev_mem_way:
#endif
#ifdef DEV_APERTURE
  if ((mem_fd = open(DEV_APERTURE, O_RDWR)) == -1)
	perror("libdha: opening aperture failed");
  else {
	void *p = mmap(0,size,PROT_READ|PROT_WRITE,MAP_SHARED,mem_fd,base);

	if (p == MAP_FAILED) {
	    perror("libdha: mapping aperture failed");
	    close(mem_fd);
	} else
	    return p;
  }
#endif

  if ( (mem_fd = open(DEV_MEM,O_RDWR)) == -1)
  {
    perror("libdha: opening /dev/mem failed");
    return MAP_FAILED;
  }

#if defined(CONFIG_DHAHELPER) || defined (CONFIG_SVGAHELPER)
mmap:
#endif
  return mmap(0,size,PROT_READ|PROT_WRITE,MAP_SHARED,mem_fd,base);
}

void unmap_phys_mem(void *ptr, unsigned long size)
{
  int res = munmap(ptr,size);

  if (res == (int)MAP_FAILED)
  {
      perror("libdha: unmapping memory failed");
      return;
  }
  
  close(mem_fd);
  mem_fd = -1;
  
  return;
}

#endif /* Generic mmap (not win32, nor os2) */

#if !defined(__alpha__) && !defined(__powerpc__)
unsigned char INPORT8(unsigned idx)
{
  return inb(idx);
}

unsigned short INPORT16(unsigned idx)
{
  return inw(idx);
}

unsigned INPORT32(unsigned idx)
{
  return inl(idx);
}

void OUTPORT8(unsigned idx,unsigned char val)
{
  outb(idx,val);
}

void OUTPORT16(unsigned idx,unsigned short val)
{
  outw(idx,val);
}

void OUTPORT32(unsigned idx,unsigned val)
{
  outl(idx,val);
}
#endif