226 lines
6.7 KiB
C
226 lines
6.7 KiB
C
/****************************************************************************
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*
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* SciTech Nucleus Audio Architecture
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*
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* Copyright (C) 1991-1998 SciTech Software, Inc.
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* All rights reserved.
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*
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* ======================================================================
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* |REMOVAL OR MODIFICATION OF THIS HEADER IS STRICTLY PROHIBITED BY LAW|
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* | |
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* |This copyrighted computer code contains proprietary technology |
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* |owned by SciTech Software, Inc., located at 505 Wall Street, |
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* |Chico, CA 95928 USA (http://www.scitechsoft.com). |
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* | |
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* |The contents of this file are subject to the SciTech Nucleus |
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* |License; you may *not* use this file or related software except in |
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* |compliance with the License. You may obtain a copy of the License |
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* |at http://www.scitechsoft.com/nucleus-license.txt |
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* | |
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* |Software distributed under the License is distributed on an |
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* |"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or |
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* |implied. See the License for the specific language governing |
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* |rights and limitations under the License. |
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* | |
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* |REMOVAL OR MODIFICATION OF THIS HEADER IS STRICTLY PROHIBITED BY LAW|
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* ======================================================================
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*
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* Language: ANSI C
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* Environment: Any 32-bit protected mode environment
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*
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* Description: C module for the Graphics Accelerator Driver API. Uses
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* the SciTech PM library for interfacing with DOS
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* extender specific functions.
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*
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****************************************************************************/
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#include "nucleus/audio.h"
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#ifdef __WIN32_VXD__
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#include "sdd/sddhelp.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#endif
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/*---------------------------- Global Variables ---------------------------*/
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#ifdef TEST_HARNESS
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extern PM_imports _VARAPI _PM_imports;
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#else
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AA_exports _VARAPI _AA_exports;
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static int loaded = false;
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static PE_MODULE *hModBPD = NULL;
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#ifdef __DRIVER__
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extern PM_imports _PM_imports;
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#else
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#include "pmimp.h"
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#endif
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static N_imports _N_imports = {
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sizeof(N_imports),
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_OS_delay,
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};
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#ifdef __DRIVER__
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extern AA_imports _AA_imports;
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#else
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static AA_imports _AA_imports = {
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sizeof(AA_imports),
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};
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#endif
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#endif
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/*----------------------------- Implementation ----------------------------*/
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#define DLL_NAME "audio.bpd"
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#ifndef TEST_HARNESS
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/****************************************************************************
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REMARKS:
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Fatal error handler for non-exported AA_exports.
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****************************************************************************/
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static void _AA_fatalErrorHandler(void)
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{
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PM_fatalError("Unsupported Nucleus export function called! Please upgrade your copy of Nucleus!\n");
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}
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/****************************************************************************
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REMARKS:
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Loads the Nucleus binary portable DLL into memory and initilises it.
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****************************************************************************/
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static ibool LoadDriver(void)
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{
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AA_initLibrary_t AA_initLibrary;
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AA_exports *aaExp;
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char filename[PM_MAX_PATH];
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char bpdpath[PM_MAX_PATH];
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int i,max;
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ulong *p;
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/* Check if we have already loaded the driver */
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if (loaded)
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return true;
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PM_init();
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_AA_exports.dwSize = sizeof(_AA_exports);
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/* Open the BPD file */
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if (!PM_findBPD(DLL_NAME,bpdpath))
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return false;
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strcpy(filename,bpdpath);
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strcat(filename,DLL_NAME);
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if ((hModBPD = PE_loadLibrary(filename,false)) == NULL)
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return false;
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if ((AA_initLibrary = (AA_initLibrary_t)PE_getProcAddress(hModBPD,"_AA_initLibrary")) == NULL)
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return false;
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bpdpath[strlen(bpdpath)-1] = 0;
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if (strcmp(bpdpath,PM_getNucleusPath()) == 0)
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strcpy(bpdpath,PM_getNucleusConfigPath());
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else {
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PM_backslash(bpdpath);
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strcat(bpdpath,"config");
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}
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if ((aaExp = AA_initLibrary(bpdpath,filename,&_PM_imports,&_N_imports,&_AA_imports)) == NULL)
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PM_fatalError("AA_initLibrary failed!\n");
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/* Initialize all default imports to point to fatal error handler
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* for upwards compatibility, and copy the exported functions.
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*/
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max = sizeof(_AA_exports)/sizeof(AA_initLibrary_t);
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for (i = 0,p = (ulong*)&_AA_exports; i < max; i++)
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*p++ = (ulong)_AA_fatalErrorHandler;
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memcpy(&_AA_exports,aaExp,MIN(sizeof(_AA_exports),aaExp->dwSize));
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loaded = true;
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return true;
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}
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/* The following are stub entry points that the application calls to
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* initialise the Nucleus loader library, and we use this to load our
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* driver DLL from disk and initialise the library using it.
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*/
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/* {secret} */
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int NAPI AA_status(void)
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{
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if (!loaded)
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return nDriverNotFound;
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return _AA_exports.AA_status();
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}
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/* {secret} */
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const char * NAPI AA_errorMsg(
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N_int32 status)
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{
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if (!loaded)
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return "Unable to load Nucleus device driver!";
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return _AA_exports.AA_errorMsg(status);
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}
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/* {secret} */
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int NAPI AA_getDaysLeft(void)
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{
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if (!LoadDriver())
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return -1;
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return _AA_exports.AA_getDaysLeft();
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}
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/* {secret} */
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int NAPI AA_registerLicense(uchar *license)
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{
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if (!LoadDriver())
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return 0;
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return _AA_exports.AA_registerLicense(license);
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}
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/* {secret} */
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int NAPI AA_enumerateDevices(void)
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{
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if (!LoadDriver())
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return 0;
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return _AA_exports.AA_enumerateDevices();
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}
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/* {secret} */
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AA_devCtx * NAPI AA_loadDriver(N_int32 deviceIndex)
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{
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if (!LoadDriver())
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return NULL;
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return _AA_exports.AA_loadDriver(deviceIndex);
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}
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#endif
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typedef struct {
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N_uint32 low;
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N_uint32 high;
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} AA_largeInteger;
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void NAPI _OS_delay8253(N_uint32 microSeconds);
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ibool NAPI _GA_haveCPUID(void);
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uint NAPI _GA_getCPUIDFeatures(void);
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void NAPI _GA_readTimeStamp(AA_largeInteger *time);
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#define CPU_HaveRDTSC 0x00000010
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/****************************************************************************
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REMARKS:
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This function delays for the specified number of microseconds
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****************************************************************************/
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void NAPI _OS_delay(
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N_uint32 microSeconds)
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{
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static ibool inited = false;
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LZTimerObject tm;
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if (_GA_haveCPUID() && (_GA_getCPUIDFeatures() & CPU_HaveRDTSC) != 0) {
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if (!inited) {
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ZTimerInit();
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inited = true;
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}
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LZTimerOnExt(&tm);
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while (LZTimerLapExt(&tm) < microSeconds)
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;
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LZTimerOnExt(&tm);
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}
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else
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_OS_delay8253(microSeconds);
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}
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