xserver-multidpi/hw/xfree86/os-support/lynxos/lynx_video.c

/*
 * Copyright 1993 by Thomas Mueller
 *
 * 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 Thomas Mueller not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Thomas Mueller makes no representations
 * about the suitability of this software for any purpose.  It is provided
 * "as is" without express or implied warranty.
 *
 * THOMAS MUELLER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THOMAS MUELLER 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: xc/programs/Xserver/hw/xfree86/os-support/lynxos/lynx_video.c,v 3.2.4.1 1997/05/09 07:15:24 hohndel Exp $ */

#include "X.h"
#include "input.h"
#include "scrnintstr.h"

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

/***************************************************************************/
/* Video Memory Mapping section                                            */
/***************************************************************************/

typedef struct
{
	char	name[16];
	pointer	Base;
	long	Size;
	char	*ptr;
	int	RefCnt;
}
_SMEMS;

#define MAX_SMEMS	8

static _SMEMS	smems[MAX_SMEMS];

static void
smemCleanup()
{
	int i;

	for (i = 0; i < MAX_SMEMS; i++) {
		if (*smems[i].name && smems[i].ptr) {
			(void)smem_create(NULL, smems[i].ptr, 0, SM_DETACH);
			(void)smem_remove(smems[i].name);
			*smems[i].name = '\0';
			smems[i].ptr = NULL;
			smems[i].Base = NULL;
			smems[i].Size = 0;
			smems[i].RefCnt = 0;
		}
	}
}

pointer xf86MapVidMem(ScreenNum, Region, Base, Size)
int ScreenNum;
int Region;
pointer Base;
unsigned long Size;
{
	static int once;
	int	free_slot = -1;
	int	i;

	if (!once)
	{
		atexit(smemCleanup);
		once = 1;
	}
	for (i = 0; i < MAX_SMEMS; i++)
	{
		if (!*smems[i].name && free_slot == -1)
			free_slot = i;
		if (smems[i].Base == Base && smems[i].Size == Size && *smems[i].name) {
			smems[i].RefCnt++;
			return smems[i].ptr;
		}
	}
	if (i == MAX_SMEMS && free_slot == -1)
	{
		FatalError("xf86MapVidMem: failed to smem_create Base %x Size %x (out of SMEMS entries)\n",
			Base, Size);
	}

	i = free_slot;
	sprintf(smems[i].name, "Video-%d", i);
	smems[i].Base = Base;
	smems[i].Size = Size;
	smems[i].ptr = smem_create(smems[i].name, Base, Size, SM_READ|SM_WRITE);
	smems[i].RefCnt = 1;
	if (smems[i].ptr == NULL)
	{
		/* check if there is a stale segment around */
		if (smem_remove(smems[i].name) == 0) {
		        ErrorF("xf86MapVidMem: removed stale smem_ segment %s\n",
		        	smems[i].name);
			smems[i].ptr = smem_create(smems[i].name, 
						Base, Size, SM_READ|SM_WRITE);
		}
	        if (smems[i].ptr == NULL) {
			*smems[i].name = '\0';
			FatalError("xf86MapVidMem: failed to smem_create Base %x Size %x (%s)\n",
				Base, Size, strerror(errno));
		}
	}
	return smems[i].ptr;
}

void xf86UnMapVidMem(ScreenNum, Region, Base, Size)
int ScreenNum;
int Region;
pointer Base;
unsigned long Size;
{
	int	i;

	for (i = 0; i < MAX_SMEMS; i++)
	{
		if (*smems[i].name && smems[i].ptr == Base && smems[i].Size == Size)
		{
			if (--smems[i].RefCnt > 0)
				return;
			(void)smem_create(NULL, smems[i].ptr, 0, SM_DETACH);
			(void)smem_remove(smems[i].name);
			*smems[i].name = '\0';
			smems[i].RefCnt = 0;
			return;
		}
	}
	ErrorF("xf86UnMapVidMem: no SMEM found for Base = %lx Size = %lx\n", Base, Size);
}

Bool xf86LinearVidMem()
{
	return(TRUE);
}


/***************************************************************************/
/* Interrupt Handling section                                              */
/***************************************************************************/

Bool xf86DisableInterrupts()
{
	return(TRUE);
}

void xf86EnableInterrupts()
{
	return;
}