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Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/pm/common/agp.c')
| -rw-r--r-- | board/MAI/bios_emulator/scitech/src/pm/common/agp.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/pm/common/agp.c b/board/MAI/bios_emulator/scitech/src/pm/common/agp.c new file mode 100644 index 0000000000..23f7e1e145 --- /dev/null +++ b/board/MAI/bios_emulator/scitech/src/pm/common/agp.c @@ -0,0 +1,190 @@ +/**************************************************************************** +* +* SciTech OS Portability Manager Library +* +* ======================================================================== +* +* The contents of this file are subject to the SciTech MGL Public +* License Version 1.0 (the "License"); you may not use this file +* except in compliance with the License. You may obtain a copy of +* the License at http://www.scitechsoft.com/mgl-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. +* +* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc. +* +* The Initial Developer of the Original Code is SciTech Software, Inc. +* All Rights Reserved. +* +* ======================================================================== +* +* Language: ANSI C +* Environment: 32-bit Ring 0 device driver +* +* Description: Generic module to implement AGP support functions using the +* SciTech Nucleus AGP support drivers. If the OS provides +* native AGP support, this module should *NOT* be used. Instead +* wrappers should be placed around the OS support functions +* to implement this functionality. +* +****************************************************************************/ + +#include "pmapi.h" +#ifndef REALMODE +#include "nucleus/agp.h" + +/*--------------------------- Global variables ----------------------------*/ + +static AGP_devCtx *agp; +static AGP_driverFuncs driver; + +/*----------------------------- Implementation ----------------------------*/ + +/**************************************************************************** +RETURNS: +Size of AGP aperture in MB on success, 0 on failure. + +REMARKS: +This function initialises the AGP driver in the system and returns the +size of the available AGP aperture in megabytes. +****************************************************************************/ +ulong PMAPI PM_agpInit(void) +{ + if ((agp = AGP_loadDriver(0)) == NULL) + return 0; + driver.dwSize = sizeof(driver); + if (!agp->QueryFunctions(AGP_GET_DRIVERFUNCS,&driver)) + return 0; + switch (driver.GetApertureSize()) { + case agpSize4MB: return 4; + case agpSize8MB: return 8; + case agpSize16MB: return 16; + case agpSize32MB: return 32; + case agpSize64MB: return 64; + case agpSize128MB: return 128; + case agpSize256MB: return 256; + case agpSize512MB: return 512; + case agpSize1GB: return 1024; + case agpSize2GB: return 2048; + } + return 0; +} + +/**************************************************************************** +REMARKS: +This function closes down the loaded AGP driver. +****************************************************************************/ +void PMAPI PM_agpExit(void) +{ + AGP_unloadDriver(agp); +} + +/**************************************************************************** +PARAMETERS: +numPages - Number of memory pages that should be reserved +type - Type of memory to allocate +physContext - Returns the physical context handle for the mapping +physAddr - Returns the physical address for the mapping + +RETURNS: +True on success, false on failure. + +REMARKS: +This function reserves a range of physical memory addresses on the system +bus which the AGP controller will respond to. If this function succeeds, +the AGP controller can respond to the reserved physical address range on +the bus. However you must first call AGP_commitPhysical to cause this memory +to actually be committed for use before it can be accessed. +****************************************************************************/ +ibool PMAPI PM_agpReservePhysical( + ulong numPages, + int type, + void **physContext, + PM_physAddr *physAddr) +{ + switch (type) { + case PM_agpUncached: + type = agpUncached; + break; + case PM_agpWriteCombine: + type = agpWriteCombine; + break; + case PM_agpIntelDCACHE: + type = agpIntelDCACHE; + break; + default: + return false; + } + return driver.ReservePhysical(numPages,type,physContext,physAddr) == nOK; +} + +/**************************************************************************** +PARAMETERS: +physContext - Physical AGP context to release + +RETURNS: +True on success, false on failure. + +REMARKS: +This function releases a range of physical memory addresses on the system +bus which the AGP controller will respond to. All committed memory for +the physical address range covered by the context will be released. +****************************************************************************/ +ibool PMAPI PM_agpReleasePhysical( + void *physContext) +{ + return driver.ReleasePhysical(physContext) == nOK; +} + +/**************************************************************************** +PARAMETERS: +physContext - Physical AGP context to commit memory for +numPages - Number of pages to be committed +startOffset - Offset in pages into the reserved physical context +physAddr - Returns the physical address of the committed memory + +RETURNS: +True on success, false on failure. + +REMARKS: +This function commits into the specified physical context that was previously +reserved by a call to ReservePhysical. You can use the startOffset and +numPages parameters to only commit portions of the reserved memory range at +a time. +****************************************************************************/ +ibool PMAPI PM_agpCommitPhysical( + void *physContext, + ulong numPages, + ulong startOffset, + PM_physAddr *physAddr) +{ + return driver.CommitPhysical(physContext,numPages,startOffset,physAddr) == nOK; +} + +/**************************************************************************** +PARAMETERS: +physContext - Physical AGP context to free memory for +numPages - Number of pages to be freed +startOffset - Offset in pages into the reserved physical context + +RETURNS: +True on success, false on failure. + +REMARKS: +This function frees memory previously committed by the CommitPhysical +function. Note that you can free a portion of a memory range that was +previously committed if you wish. +****************************************************************************/ +ibool PMAPI PM_agpFreePhysical( + void *physContext, + ulong numPages, + ulong startOffset) +{ + return driver.FreePhysical(physContext,numPages,startOffset) == nOK; +} + +#endif /* !REALMODE */ + |
