168 lines
4.2 KiB
C
168 lines
4.2 KiB
C
/*
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* Copyright 1993 by Thomas Mueller
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Thomas Mueller not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Thomas Mueller makes no representations
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* about the suitability of this software for any purpose. It is provided
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* "as is" without express or implied warranty.
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*
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* THOMAS MUELLER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THOMAS MUELLER BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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/* $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 $ */
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#include "X.h"
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#include "input.h"
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#include "scrnintstr.h"
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#include "xf86.h"
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#include "xf86Priv.h"
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#include "xf86_OSlib.h"
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/***************************************************************************/
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/* Video Memory Mapping section */
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/***************************************************************************/
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typedef struct
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{
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char name[16];
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pointer Base;
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long Size;
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char *ptr;
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int RefCnt;
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}
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_SMEMS;
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#define MAX_SMEMS 8
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static _SMEMS smems[MAX_SMEMS];
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static void
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smemCleanup()
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{
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int i;
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for (i = 0; i < MAX_SMEMS; i++) {
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if (*smems[i].name && smems[i].ptr) {
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(void)smem_create(NULL, smems[i].ptr, 0, SM_DETACH);
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(void)smem_remove(smems[i].name);
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*smems[i].name = '\0';
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smems[i].ptr = NULL;
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smems[i].Base = NULL;
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smems[i].Size = 0;
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smems[i].RefCnt = 0;
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}
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}
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}
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pointer xf86MapVidMem(ScreenNum, Region, Base, Size)
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int ScreenNum;
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int Region;
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pointer Base;
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unsigned long Size;
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{
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static int once;
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int free_slot = -1;
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int i;
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if (!once)
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{
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atexit(smemCleanup);
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once = 1;
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}
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for (i = 0; i < MAX_SMEMS; i++)
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{
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if (!*smems[i].name && free_slot == -1)
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free_slot = i;
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if (smems[i].Base == Base && smems[i].Size == Size && *smems[i].name) {
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smems[i].RefCnt++;
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return smems[i].ptr;
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}
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}
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if (i == MAX_SMEMS && free_slot == -1)
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{
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FatalError("xf86MapVidMem: failed to smem_create Base %x Size %x (out of SMEMS entries)\n",
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Base, Size);
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}
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i = free_slot;
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sprintf(smems[i].name, "Video-%d", i);
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smems[i].Base = Base;
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smems[i].Size = Size;
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smems[i].ptr = smem_create(smems[i].name, Base, Size, SM_READ|SM_WRITE);
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smems[i].RefCnt = 1;
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if (smems[i].ptr == NULL)
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{
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/* check if there is a stale segment around */
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if (smem_remove(smems[i].name) == 0) {
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ErrorF("xf86MapVidMem: removed stale smem_ segment %s\n",
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smems[i].name);
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smems[i].ptr = smem_create(smems[i].name,
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Base, Size, SM_READ|SM_WRITE);
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}
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if (smems[i].ptr == NULL) {
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*smems[i].name = '\0';
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FatalError("xf86MapVidMem: failed to smem_create Base %x Size %x (%s)\n",
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Base, Size, strerror(errno));
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}
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}
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return smems[i].ptr;
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}
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void xf86UnMapVidMem(ScreenNum, Region, Base, Size)
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int ScreenNum;
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int Region;
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pointer Base;
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unsigned long Size;
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{
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int i;
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for (i = 0; i < MAX_SMEMS; i++)
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{
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if (*smems[i].name && smems[i].ptr == Base && smems[i].Size == Size)
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{
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if (--smems[i].RefCnt > 0)
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return;
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(void)smem_create(NULL, smems[i].ptr, 0, SM_DETACH);
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(void)smem_remove(smems[i].name);
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*smems[i].name = '\0';
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smems[i].RefCnt = 0;
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return;
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}
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}
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ErrorF("xf86UnMapVidMem: no SMEM found for Base = %lx Size = %lx\n", Base, Size);
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}
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Bool xf86LinearVidMem()
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{
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return(TRUE);
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}
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/***************************************************************************/
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/* Interrupt Handling section */
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/***************************************************************************/
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Bool xf86DisableInterrupts()
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{
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return(TRUE);
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}
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void xf86EnableInterrupts()
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{
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return;
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}
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