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/****************************************************************************
*
* SciTech Nucleus Audio 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/audio.h"
#ifdef __WIN32_VXD__
#include "sdd/sddhelp.h"
#else
#include <stdio.h>
#include <stdlib.h>
#endif
/*---------------------------- Global Variables ---------------------------*/
#ifdef TEST_HARNESS
extern PM_imports _VARAPI _PM_imports;
#else
AA_exports _VARAPI _AA_exports;
static int loaded = false;
static PE_MODULE *hModBPD = NULL;
#ifdef __DRIVER__
extern PM_imports _PM_imports;
#else
#include "pmimp.h"
#endif
static N_imports _N_imports = {
sizeof(N_imports),
_OS_delay,
};
#ifdef __DRIVER__
extern AA_imports _AA_imports;
#else
static AA_imports _AA_imports = {
sizeof(AA_imports),
};
#endif
#endif
/*----------------------------- Implementation ----------------------------*/
#define DLL_NAME "audio.bpd"
#ifndef TEST_HARNESS
/****************************************************************************
REMARKS:
Fatal error handler for non-exported AA_exports.
****************************************************************************/
static void _AA_fatalErrorHandler(void)
{
PM_fatalError("Unsupported Nucleus export function called! Please upgrade your copy of Nucleus!\n");
}
/****************************************************************************
REMARKS:
Loads the Nucleus binary portable DLL into memory and initilises it.
****************************************************************************/
static ibool LoadDriver(void)
{
AA_initLibrary_t AA_initLibrary;
AA_exports *aaExp;
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();
_AA_exports.dwSize = sizeof(_AA_exports);
/* 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 ((AA_initLibrary = (AA_initLibrary_t)PE_getProcAddress(hModBPD,"_AA_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 ((aaExp = AA_initLibrary(bpdpath,filename,&_PM_imports,&_N_imports,&_AA_imports)) == NULL)
PM_fatalError("AA_initLibrary failed!\n");
/* Initialize all default imports to point to fatal error handler
* for upwards compatibility, and copy the exported functions.
*/
max = sizeof(_AA_exports)/sizeof(AA_initLibrary_t);
for (i = 0,p = (ulong*)&_AA_exports; i < max; i++)
*p++ = (ulong)_AA_fatalErrorHandler;
memcpy(&_AA_exports,aaExp,MIN(sizeof(_AA_exports),aaExp->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 AA_status(void)
{
if (!loaded)
return nDriverNotFound;
return _AA_exports.AA_status();
}
/* {secret} */
const char * NAPI AA_errorMsg(
N_int32 status)
{
if (!loaded)
return "Unable to load Nucleus device driver!";
return _AA_exports.AA_errorMsg(status);
}
/* {secret} */
int NAPI AA_getDaysLeft(void)
{
if (!LoadDriver())
return -1;
return _AA_exports.AA_getDaysLeft();
}
/* {secret} */
int NAPI AA_registerLicense(uchar *license)
{
if (!LoadDriver())
return 0;
return _AA_exports.AA_registerLicense(license);
}
/* {secret} */
int NAPI AA_enumerateDevices(void)
{
if (!LoadDriver())
return 0;
return _AA_exports.AA_enumerateDevices();
}
/* {secret} */
AA_devCtx * NAPI AA_loadDriver(N_int32 deviceIndex)
{
if (!LoadDriver())
return NULL;
return _AA_exports.AA_loadDriver(deviceIndex);
}
#endif
typedef struct {
N_uint32 low;
N_uint32 high;
} AA_largeInteger;
void NAPI _OS_delay8253(N_uint32 microSeconds);
ibool NAPI _GA_haveCPUID(void);
uint NAPI _GA_getCPUIDFeatures(void);
void NAPI _GA_readTimeStamp(AA_largeInteger *time);
#define CPU_HaveRDTSC 0x00000010
/****************************************************************************
REMARKS:
This function delays for the specified number of microseconds
****************************************************************************/
void NAPI _OS_delay(
N_uint32 microSeconds)
{
static ibool inited = false;
LZTimerObject tm;
if (_GA_haveCPUID() && (_GA_getCPUIDFeatures() & CPU_HaveRDTSC) != 0) {
if (!inited) {
ZTimerInit();
inited = true;
}
LZTimerOnExt(&tm);
while (LZTimerLapExt(&tm) < microSeconds)
;
LZTimerOnExt(&tm);
}
else
_OS_delay8253(microSeconds);
}
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