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/****************************************************************************
*
* SciTech Nucleus Graphics Architecture
*
* Copyright (C) 1991-1998 SciTech Software, Inc.
* All rights reserved.
*
* ======================================================================
* |REMOVAL OR MODIFICATION OF THIS HEADER IS STRICTLY PROHIBITED BY LAW|
* | |
* |This copyrighted computer code contains proprietary technology |
* |owned by SciTech Software, Inc., located at 505 Wall Street, |
* |Chico, CA 95928 USA (http://www.scitechsoft.com). |
* | |
* |The contents of this file are subject to the SciTech Nucleus |
* |License; you may *not* use this file or related software except in |
* |compliance with the License. You may obtain a copy of the License |
* |at http://www.scitechsoft.com/nucleus-license.txt |
* | |
* |Software distributed under the License is distributed on an |
* |"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or |
* |implied. See the License for the specific language governing |
* |rights and limitations under the License. |
* | |
* |REMOVAL OR MODIFICATION OF THIS HEADER IS STRICTLY PROHIBITED BY LAW|
* ======================================================================
*
* Language: ANSI C
* Environment: Any 32-bit protected mode environment
*
* Description: C module for the Graphics Accelerator Driver API. Uses
* the SciTech PM library for interfacing with DOS
* extender specific functions.
*
****************************************************************************/
#include "nucleus/graphics.h"
#include "nucleus/agp.h"
/*---------------------------- Global Variables ---------------------------*/
#ifndef DEBUG_AGP_DRIVER
static AGP_exports _AGP_exports;
static int loaded = false;
static PE_MODULE *hModBPD = NULL;
static N_imports _N_imports = {
sizeof(N_imports),
_OS_delay,
};
static AGP_imports _AGP_imports = {
sizeof(AGP_imports),
};
#endif
#include "pmimp.h"
/*----------------------------- Implementation ----------------------------*/
#define DLL_NAME "agp.bpd"
#ifndef DEBUG_AGP_DRIVER
/****************************************************************************
REMARKS:
Fatal error handler for non-exported GA_exports.
****************************************************************************/
static void _AGP_fatalErrorHandler(void)
{
PM_fatalError("Unsupported AGP export function called! Please upgrade your copy of AGP!\n");
}
/****************************************************************************
PARAMETERS:
shared - True to load the driver into shared memory.
REMARKS:
Loads the Nucleus binary portable DLL into memory and initilises it.
****************************************************************************/
static ibool LoadDriver(void)
{
AGP_initLibrary_t AGP_initLibrary;
AGP_exports *agpExp;
char filename[PM_MAX_PATH];
char bpdpath[PM_MAX_PATH];
int i,max;
ulong *p;
/* Check if we have already loaded the driver */
if (loaded)
return true;
PM_init();
/* Open the BPD file */
if (!PM_findBPD(DLL_NAME,bpdpath))
return false;
strcpy(filename,bpdpath);
strcat(filename,DLL_NAME);
if ((hModBPD = PE_loadLibrary(filename,false)) == NULL)
return false;
if ((AGP_initLibrary = (AGP_initLibrary_t)PE_getProcAddress(hModBPD,"_AGP_initLibrary")) == NULL)
return false;
bpdpath[strlen(bpdpath)-1] = 0;
if (strcmp(bpdpath,PM_getNucleusPath()) == 0)
strcpy(bpdpath,PM_getNucleusConfigPath());
else {
PM_backslash(bpdpath);
strcat(bpdpath,"config");
}
if ((agpExp = AGP_initLibrary(bpdpath,filename,GA_getSystemPMImports(),&_N_imports,&_AGP_imports)) == NULL)
PM_fatalError("AGP_initLibrary failed!\n");
_AGP_exports.dwSize = sizeof(_AGP_exports);
max = sizeof(_AGP_exports)/sizeof(AGP_initLibrary_t);
for (i = 0,p = (ulong*)&_AGP_exports; i < max; i++)
*p++ = (ulong)_AGP_fatalErrorHandler;
memcpy(&_AGP_exports,agpExp,MIN(sizeof(_AGP_exports),agpExp->dwSize));
loaded = true;
return true;
}
/* The following are stub entry points that the application calls to
* initialise the Nucleus loader library, and we use this to load our
* driver DLL from disk and initialise the library using it.
*/
/* {secret} */
int NAPI AGP_status(void)
{
if (!loaded)
return nDriverNotFound;
return _AGP_exports.AGP_status();
}
/* {secret} */
const char * NAPI AGP_errorMsg(
N_int32 status)
{
if (!loaded)
return "Unable to load Nucleus device driver!";
return _AGP_exports.AGP_errorMsg(status);
}
/* {secret} */
AGP_devCtx * NAPI AGP_loadDriver(N_int32 deviceIndex)
{
if (!LoadDriver())
return NULL;
return _AGP_exports.AGP_loadDriver(deviceIndex);
}
/* {secret} */
void NAPI AGP_unloadDriver(
AGP_devCtx *dc)
{
if (loaded)
_AGP_exports.AGP_unloadDriver(dc);
}
/* {secret} */
void NAPI AGP_getGlobalOptions(
AGP_globalOptions *options)
{
if (LoadDriver())
_AGP_exports.AGP_getGlobalOptions(options);
}
/* {secret} */
void NAPI AGP_setGlobalOptions(
AGP_globalOptions *options)
{
if (LoadDriver())
_AGP_exports.AGP_setGlobalOptions(options);
}
/* {secret} */
void NAPI AGP_saveGlobalOptions(
AGP_globalOptions *options)
{
if (loaded)
_AGP_exports.AGP_saveGlobalOptions(options);
}
#endif
/* {secret} */
void NAPI _OS_delay8253(N_uint32 microSeconds);
/****************************************************************************
REMARKS:
This function delays for the specified number of microseconds
****************************************************************************/
void NAPI _OS_delay(
N_uint32 microSeconds)
{
static ibool inited = false;
static ibool haveRDTSC;
LZTimerObject tm;
if (!inited) {
#ifndef __WIN32_VXD__
/* This has been causing problems in VxD's for some reason, so for now */
/* we avoid using it. */
if (_GA_haveCPUID() && (_GA_getCPUIDFeatures() & CPU_HaveRDTSC) != 0) {
ZTimerInit();
haveRDTSC = true;
}
else
#endif
haveRDTSC = false;
inited = true;
}
if (haveRDTSC) {
LZTimerOnExt(&tm);
while (LZTimerLapExt(&tm) < microSeconds)
;
LZTimerOnExt(&tm);
}
else
_OS_delay8253(microSeconds);
}
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