/*++ Copyright (c) 1998 VIA Technologies, Inc. and Microsoft Corporation Module Name: gart.c Abstract: Routines for querying and setting the VIA VT82C597 ... GART aperture Revision History: --*/ #include "viaagp.h" // // Local function prototypes // NTSTATUS AgpVIACreateGart( IN PAGPVIA_EXTENSION AgpContext, IN ULONG MinimumPages ); NTSTATUS AgpVIASetRate( IN PVOID AgpContext, IN ULONG AgpRate ); PGART_PTE AgpVIAFindRangeInGart( IN PGART_PTE StartPte, IN PGART_PTE EndPte, IN ULONG Length, IN BOOLEAN SearchBackward, IN ULONG SearchState ); VOID AgpVIAFlushPageTLB( IN PAGPVIA_EXTENSION AgpContext ); VOID AgpVIAFlushData( IN PAGPVIA_EXTENSION AgpContext ); #ifdef ALLOC_PRAGMA #pragma alloc_text(PAGE, AgpDisableAperture) #pragma alloc_text(PAGE, AgpQueryAperture) #pragma alloc_text(PAGE, AgpVIAFlushData) #pragma alloc_text(PAGE, AgpVIAFlushPageTLB) #pragma alloc_text(PAGE, AgpMapMemory) #pragma alloc_text(PAGE, AgpUnMapMemory) #pragma alloc_text(PAGE, AgpReserveMemory) #pragma alloc_text(PAGE, AgpReleaseMemory) #pragma alloc_text(PAGE, AgpVIACreateGart) #pragma alloc_text(PAGE, AgpVIAFindRangeInGart) #pragma alloc_text(PAGE, AgpFindFreeRun) #pragma alloc_text(PAGE, AgpGetMappedPages) #endif #define VIA_FIRST_AVAILABLE_PTE 0 NTSTATUS AgpQueryAperture( IN PAGPVIA_EXTENSION AgpContext, OUT PHYSICAL_ADDRESS *CurrentBase, OUT ULONG *CurrentSizeInPages, OUT OPTIONAL PIO_RESOURCE_LIST *ApertureRequirements ) /*++ Routine Description: Queries the current size of the GART aperture. Optionally returns the possible GART settings. Arguments: AgpContext - Supplies the AGP context. CurrentBase - Returns the current physical address of the GART. CurrentSizeInPages - Returns the current GART size. ApertureRequirements - if present, returns the possible GART settings Return Value: NTSTATUS --*/ { ULONG GaBase; UCHAR GaSize; PIO_RESOURCE_LIST Requirements; ULONG i; ULONG Length; PAGED_CODE(); // // Get the current GABASE and GASIZE settings // ReadVIAConfig(&GaBase, GABASE_OFFSET, sizeof(GaBase)); ReadVIAConfig(&GaSize, GASIZE_OFFSET, sizeof(GaSize)); ASSERT(GaBase != 0); CurrentBase->QuadPart = GaBase & PCI_ADDRESS_MEMORY_ADDRESS_MASK; // // Convert APSIZE into the actual size of the aperture // switch (GaSize) { case GA_SIZE_1MB: *CurrentSizeInPages = (1 * 1024*1024) / PAGE_SIZE; break; case GA_SIZE_2MB: *CurrentSizeInPages = (2 * 1024*1024) / PAGE_SIZE; break; case GA_SIZE_4MB: *CurrentSizeInPages = (4 * 1024*1024) / PAGE_SIZE; break; case GA_SIZE_8MB: *CurrentSizeInPages = 8 * (1024*1024 / PAGE_SIZE); break; case GA_SIZE_16MB: *CurrentSizeInPages = 16 * (1024*1024 / PAGE_SIZE); break; case GA_SIZE_32MB: *CurrentSizeInPages = 32 * (1024*1024 / PAGE_SIZE); break; case GA_SIZE_64MB: *CurrentSizeInPages = 64 * (1024*1024 / PAGE_SIZE); break; case GA_SIZE_128MB: *CurrentSizeInPages = 128 * (1024*1024 / PAGE_SIZE); break; case GA_SIZE_256MB: *CurrentSizeInPages = 256 * (1024*1024 / PAGE_SIZE); break; default: AGPLOG(AGP_CRITICAL, ("VIAAGP - AgpQueryAperture - Unexpected value %x for GaSize!\n", GaSize)); ASSERT(FALSE); AgpContext->ApertureStart.QuadPart = 0; AgpContext->ApertureLength = 0; return(STATUS_UNSUCCESSFUL); } // // Remember the current aperture settings // AgpContext->ApertureStart.QuadPart = CurrentBase->QuadPart; AgpContext->ApertureLength = *CurrentSizeInPages * PAGE_SIZE; if (ApertureRequirements != NULL) { // // VIA supports 9 different aperture sizes, all must be // naturally aligned. Start with the largest aperture and // work downwards so that we get the biggest possible aperture. // Requirements = ExAllocatePoolWithTag(PagedPool, sizeof(IO_RESOURCE_LIST) + (GA_SIZE_COUNT-1)*sizeof(IO_RESOURCE_DESCRIPTOR), 'RpgA'); if (Requirements == NULL) { return(STATUS_INSUFFICIENT_RESOURCES); } Requirements->Version = Requirements->Revision = 1; Requirements->Count = GA_SIZE_COUNT; Length = GA_MAX_SIZE; for (i=0; iDescriptors[i].Option = IO_RESOURCE_ALTERNATIVE; Requirements->Descriptors[i].Type = CmResourceTypeMemory; Requirements->Descriptors[i].ShareDisposition = CmResourceShareDeviceExclusive; Requirements->Descriptors[i].Flags = CM_RESOURCE_MEMORY_READ_WRITE | CM_RESOURCE_MEMORY_PREFETCHABLE; Requirements->Descriptors[i].u.Memory.Length = Length; Requirements->Descriptors[i].u.Memory.Alignment = Length; Requirements->Descriptors[i].u.Memory.MinimumAddress.QuadPart = 0; Requirements->Descriptors[i].u.Memory.MaximumAddress.QuadPart = (ULONG)-1; Length = Length/2; } *ApertureRequirements = Requirements; } return(STATUS_SUCCESS); } NTSTATUS AgpSetAperture( IN PAGPVIA_EXTENSION AgpContext, IN PHYSICAL_ADDRESS NewBase, IN ULONG NewSizeInPages ) /*++ Routine Description: Sets the GART aperture to the supplied settings Arguments: AgpContext - Supplies the AGP context NewBase - Supplies the new physical memory base for the GART. NewSizeInPages - Supplies the new size for the GART Return Value: NTSTATUS --*/ { VIA_GATT_BASE GATTBase; UCHAR GaSize; ULONG GaBase; // // Figure out the new APSIZE setting, make sure it is valid. // switch (NewSizeInPages) { case 1 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_1MB; break; case 2 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_2MB; break; case 4 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_4MB; break; case 8 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_8MB; break; case 16 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_16MB; break; case 32 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_32MB; break; case 64 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_64MB; break; case 128 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_128MB; break; case 256 * 1024 * 1024 / PAGE_SIZE: GaSize = GA_SIZE_256MB; break; default: AGPLOG(AGP_CRITICAL, ("AgpSetAperture - invalid GART size of %lx pages specified, aperture at %I64X.\n", NewSizeInPages, NewBase.QuadPart)); ASSERT(FALSE); return(STATUS_INVALID_PARAMETER); } // // Make sure the supplied size is aligned on the appropriate boundary. // ASSERT(NewBase.HighPart == 0); ASSERT((NewBase.QuadPart & ((NewSizeInPages * PAGE_SIZE) - 1)) == 0); if ((NewBase.QuadPart & ((NewSizeInPages * PAGE_SIZE) - 1)) != 0 ) { AGPLOG(AGP_CRITICAL, ("AgpSetAperture - invalid base %I64X specified for GART aperture of %lx pages\n", NewBase.QuadPart, NewSizeInPages)); return(STATUS_INVALID_PARAMETER); } // // Reprogram Special Target settings when the chip // is powered off, but ignore rate changes as those were already // applied during MasterInit // if (AgpContext->SpecialTarget & ~AGP_FLAG_SPECIAL_RESERVE) { AgpSpecialTarget(AgpContext, AgpContext->SpecialTarget & ~AGP_FLAG_SPECIAL_RESERVE); } // // Need to reset the hardware to match the supplied settings // // If the aperture is enabled, disable it, write the new settings, then // reenable the aperture // ViaApertureEnable(OFF); // // Write GASIZE first, as this will enable the correct bits in GABASE that // need to be written next. // WriteVIAConfig(&GaSize, GASIZE_OFFSET, sizeof(GaSize)); // // While the aperture base address is changed, 88[1] must be set as 1, // otherwise the high aperture address will not change. // ViaGartEnable(ON); // // Now we can update GABASE // GaBase = NewBase.LowPart & PCI_ADDRESS_MEMORY_ADDRESS_MASK; WriteVIAConfig(&GaBase, GABASE_OFFSET, sizeof(GaBase)); #if DBG // // Read back what we wrote, make sure it worked // { ULONG DbgBase; UCHAR DbgSize; ReadVIAConfig(&DbgSize, GASIZE_OFFSET, sizeof(GaSize)); ReadVIAConfig(&DbgBase, GABASE_OFFSET, sizeof(GaBase)); ASSERT(DbgSize == GaSize); ASSERT((DbgBase & PCI_ADDRESS_MEMORY_ADDRESS_MASK) == GaBase); } #endif // // Now enable the aperture if it was enabled before // // EFNfix: Apparently code was added (above) which indiscriminantly // enables aperture, so we must turn it off if !GlobalEnable // if (AgpContext->GlobalEnable == FALSE) { ViaApertureEnable(OFF); } else { ViaApertureEnable(ON); } // // Update our extension to reflect the new GART setting // AgpContext->ApertureStart = NewBase; AgpContext->ApertureLength = NewSizeInPages * PAGE_SIZE; // // Enable the TB in case we are resuming from S3 or S4 // // // If the GART has been allocated, rewrite the GARTBASE // if (AgpContext->Gart != NULL) { ULONG uTmpPhysAddr; ReadVIAConfig(&uTmpPhysAddr, GATTBASE_OFFSET, sizeof(uTmpPhysAddr)); uTmpPhysAddr = (AgpContext->GartPhysical.LowPart & 0xFFFFF000) | (uTmpPhysAddr & 0x00000FFF); WriteVIAConfig(&uTmpPhysAddr, GATTBASE_OFFSET, sizeof(uTmpPhysAddr)); } return(STATUS_SUCCESS); } VOID AgpDisableAperture( IN PAGPVIA_EXTENSION AgpContext ) /*++ Routine Description: Disables the GART aperture so that this resource is available for other devices Arguments: AgpContext - Supplies the AGP context Return Value: None - this routine must always succeed. --*/ { // // Disable the aperture // ViaApertureEnable(OFF); AgpContext->GlobalEnable = FALSE; // // Nuke the Gart! (It's meaningless now...) // if (AgpContext->Gart != NULL) { MmFreeContiguousMemory(AgpContext->Gart); AgpContext->Gart = NULL; AgpContext->GartLength = 0; } } NTSTATUS AgpReserveMemory( IN PAGPVIA_EXTENSION AgpContext, IN OUT AGP_RANGE *Range ) /*++ Routine Description: Reserves a range of memory in the GART. Arguments: AgpContext - Supplies the AGP Context Range - Supplies the AGP_RANGE structure. AGPLIB will have filled in NumberOfPages and Type. This routine will fill in MemoryBase and Context. Return Value: NTSTATUS --*/ { ULONG Index; ULONG NewState; NTSTATUS Status; PGART_PTE FoundRange; BOOLEAN Backwards; PAGED_CODE(); ASSERT((Range->Type == MmNonCached) || (Range->Type == MmWriteCombined)); ASSERT(Range->NumberOfPages <= (AgpContext->ApertureLength / PAGE_SIZE)); // // If we have not allocated our GART yet, now is the time to do so // if (AgpContext->Gart == NULL) { ASSERT(AgpContext->GartLength == 0); Status = AgpVIACreateGart(AgpContext,Range->NumberOfPages); if (!NT_SUCCESS(Status)) { AGPLOG(AGP_CRITICAL, ("AgpVIACreateGart failed %08lx to create GART of size %lx\n", Status, AgpContext->ApertureLength)); return(Status); } } ASSERT(AgpContext->GartLength != 0); // // Now that we have a GART, try and find enough contiguous entries to satisfy // the request. Requests for uncached memory will scan from high addresses to // low addresses. Requests for write-combined memory will scan from low addresses // to high addresses. We will use a first-fit algorithm to try and keep the allocations // packed and contiguous. // Backwards = (Range->Type == MmNonCached) ? TRUE : FALSE; FoundRange = AgpVIAFindRangeInGart(&AgpContext->Gart[VIA_FIRST_AVAILABLE_PTE], &AgpContext->Gart[(AgpContext->GartLength / sizeof(GART_PTE)) - 1], Range->NumberOfPages, Backwards, GART_ENTRY_FREE); if (FoundRange == NULL) { // // A big enough chunk was not found. // AGPLOG(AGP_CRITICAL, ("AgpReserveMemory - Could not find %d contiguous free pages of type %d in GART at %08lx\n", Range->NumberOfPages, Range->Type, AgpContext->Gart)); // // This is where we could try and grow the GART // return(STATUS_INSUFFICIENT_RESOURCES); } AGPLOG(AGP_NOISE, ("AgpReserveMemory - reserved %d pages at GART PTE %08lx\n", Range->NumberOfPages, FoundRange)); // // Set these pages to reserved // if (Range->Type == MmNonCached) { NewState = GART_ENTRY_RESERVED_UC; } else { NewState = GART_ENTRY_RESERVED_WC; } for (Index = 0;Index < Range->NumberOfPages; Index++) { ASSERT(FoundRange[Index].Soft.State == GART_ENTRY_FREE); FoundRange[Index].AsUlong = 0; FoundRange[Index].Soft.State = NewState; } Range->MemoryBase.QuadPart = AgpContext->ApertureStart.QuadPart + (FoundRange - &AgpContext->Gart[0]) * PAGE_SIZE; Range->Context = FoundRange; ASSERT(Range->MemoryBase.HighPart == 0); AGPLOG(AGP_NOISE, ("AgpReserveMemory - reserved memory handle %lx at PA %08lx\n", FoundRange, Range->MemoryBase.LowPart)); return(STATUS_SUCCESS); } NTSTATUS AgpReleaseMemory( IN PAGPVIA_EXTENSION AgpContext, IN PAGP_RANGE Range ) /*++ Routine Description: Releases memory previously reserved with AgpReserveMemory Arguments: AgpContext - Supplies the AGP context AgpRange - Supplies the range to be released. Return Value: NTSTATUS --*/ { PGART_PTE Pte; ULONG Start; PAGED_CODE() // // Go through and free all the PTEs. None of these should still // be valid at this point. // for (Pte = Range->Context; Pte < (PGART_PTE)Range->Context + Range->NumberOfPages; Pte++) { if (Range->Type == MmNonCached) { ASSERT(Pte->Soft.State == GART_ENTRY_RESERVED_UC); } else { ASSERT(Pte->Soft.State == GART_ENTRY_RESERVED_WC); } Pte->Soft.State = GART_ENTRY_FREE; } Range->MemoryBase.QuadPart = 0; return(STATUS_SUCCESS); } #define AGP_TEST_SIGNATURE 0xAA55AA55 NTSTATUS AgpVIACreateGart( IN PAGPVIA_EXTENSION AgpContext, IN ULONG MinimumPages ) /*++ Routine Description: Allocates and initializes an empty GART. The current implementation attempts to allocate the entire GART on the first reserve. Arguments: AgpContext - Supplies the AGP context MinimumPages - Supplies the minimum size (in pages) of the GART to be created. Return Value: NTSTATUS --*/ { PHYSICAL_ADDRESS LowestAcceptable; PHYSICAL_ADDRESS BoundaryMultiple; PGART_PTE Gart; ULONG GartLength; ULONG TempPhysAddr; PHYSICAL_ADDRESS HighestAcceptable; PHYSICAL_ADDRESS GartPhysical; PULONG TestPage; ULONG i; PAGED_CODE(); // // Try and get a chunk of contiguous memory big enough to map the // entire aperture. // LowestAcceptable.QuadPart = 0; BoundaryMultiple.QuadPart = (ULONGLONG)VIA_GART_ALIGN(AgpContext->ApertureLength); HighestAcceptable.QuadPart = 0xFFFFFFFF; GartLength = BYTES_TO_PAGES(AgpContext->ApertureLength) * sizeof(GART_PTE); Gart = MmAllocateContiguousMemorySpecifyCache(GartLength, LowestAcceptable, HighestAcceptable, BoundaryMultiple, MmNonCached); if (Gart == NULL) { AGPLOG(AGP_CRITICAL, ("AgpVIACreateGart - MmAllocateContiguousMemory %lx failed\n", GartLength)); return(STATUS_INSUFFICIENT_RESOURCES); } // // We successfully allocated a contiguous chunk of memory. // It should be page aligned already. // ASSERT(((ULONG_PTR)Gart & (PAGE_SIZE-1)) == 0); // // Get the physical address. // GartPhysical = MmGetPhysicalAddress(Gart); AGPLOG(AGP_NOISE, ("AgpVIACreateGart - GART of length %lx created at VA %08lx, PA %08lx\n", GartLength, Gart, GartPhysical.LowPart)); ASSERT(GartPhysical.HighPart == 0); ASSERT(VIA_VERIFY_GART_ALIGN(GartPhysical.LowPart, AgpContext->ApertureLength)); // // Initialize all the PTEs to free // for (i=0; iGart = Gart; AgpContext->GartLength = GartLength; AgpContext->GartPhysical = GartPhysical; #if 0 // // Test if AGP is working // LowestAcceptable.QuadPart = 0; BoundaryMultiple.QuadPart = 0; HighestAcceptable.QuadPart = 0xFFFFFFFF; TestPage = (PULONG)MmAllocateContiguousMemorySpecifyCache(PAGE_SIZE, LowestAcceptable, HighestAcceptable, BoundaryMultiple, MmNonCached); if (TestPage) { PVOID ApertureVa; ULONG TestPte; TestPage[0] = AGP_TEST_SIGNATURE; TestPte = MmGetPhysicalAddress(TestPage).LowPart; // // Setup a translation so the first page at aperture base points // to our test page // Gart[0].AsUlong = (((UINT_PTR)TestPte >> PAGE_SHIFT) * PAGE_SIZE) | GART_ENTRY_VALID; // // Flush the write buffer // i = Gart[0].AsUlong; // // Flush the TLB // AgpVIAFlushPageTLB(AgpContext); // // Try to read our signature through the aperture/gart translation // ApertureVa = MmMapIoSpace(AgpContext->ApertureStart, PAGE_SIZE, MmNonCached); ASSERT(ApertureVa != NULL); i = *(PULONG)ApertureVa; AGPLOG(AGP_NOISE, ("AgpVIACreateGart AGP test: wrote (%08x) PA %08x=badceede, " "mapped gart[0] %08x=%08x, read AP_BASE (%08x) VA %08x=%08x\n", TestPage, TestPte, Gart, Gart[0].AsUlong, AgpContext->ApertureStart.LowPart, ApertureVa, i)); MmUnmapIoSpace(ApertureVa, PAGE_SIZE); // // Cleanup // Gart[0].AsUlong = 0; Gart[0].Soft.State = GART_ENTRY_FREE; TestPage[0] = Gart[0].AsUlong; AgpVIAFlushPageTLB(AgpContext); MmFreeContiguousMemory(TestPage); // // Turn off everything, and bail, AGP is broken // if (i != AGP_TEST_SIGNATURE) { AGPLOG(AGP_CRITICAL, ("AgpVIACreateGart - AGP failed: Read=%08x\n", i)); AgpDisableAperture(AgpContext); // // Need to let the user know what happened here // //AgpLogGenericHwFailure(); return STATUS_DEVICE_CONFIGURATION_ERROR; } } #endif return(STATUS_SUCCESS); } NTSTATUS AgpMapMemory( IN PAGPVIA_EXTENSION AgpContext, IN PAGP_RANGE Range, IN PMDL Mdl, IN ULONG OffsetInPages, OUT PHYSICAL_ADDRESS *MemoryBase ) /*++ Routine Description: Maps physical memory into the GART somewhere in the specified range. Arguments: AgpContext - Supplies the AGP context Range - Supplies the AGP range that the memory should be mapped into Mdl - Supplies the MDL describing the physical pages to be mapped MemoryBase - Returns the physical memory in the aperture where the pages were mapped. Return Value: NTSTATUS --*/ { ULONG PageCount; PGART_PTE Pte; PGART_PTE StartPte; ULONG Index; ULONG TargetState; PULONG Page; BOOLEAN Backwards; GART_PTE NewPte; VIA_GATT_BASE GATTBase; NTSTATUS Status; PAGED_CODE(); ASSERT(Mdl->Next == NULL); StartPte = Range->Context; PageCount = BYTES_TO_PAGES(Mdl->ByteCount); ASSERT(PageCount <= Range->NumberOfPages); ASSERT(PageCount > 0); TargetState = (Range->Type == MmNonCached) ? GART_ENTRY_RESERVED_UC : GART_ENTRY_RESERVED_WC; Pte = StartPte + OffsetInPages; // // We have a suitable range, now fill it in with the supplied MDL. // ASSERT(Pte >= StartPte); ASSERT(Pte + PageCount <= StartPte + Range->NumberOfPages); NewPte.AsUlong = 0; NewPte.Soft.State = (Range->Type == MmNonCached) ? GART_ENTRY_VALID_UC : GART_ENTRY_VALID_WC; Page = (PULONG)(Mdl + 1); for (Index = 0; Index < PageCount; Index++) { ASSERT(Pte[Index].Soft.State == TargetState); NewPte.Hard.Page = *Page++; Pte[Index].AsUlong = NewPte.AsUlong; ASSERT(Pte[Index].Hard.Valid == 1); } // // We have filled in all the PTEs. Read back the last one we wrote // in order to flush the write buffers. // NewPte.AsUlong = *(volatile ULONG *)&Pte[PageCount-1].AsUlong; // // If we have not yet gotten around to enabling the GART aperture, do it now. // if (!AgpContext->GlobalEnable) { VIA_GATT_BASE GARTBASE_Config; AGPLOG(AGP_NOISE, ("AgpMapMemory - Enabling global aperture access\n")); ViaApertureEnable(ON); ReadVIAConfig(&GARTBASE_Config, GATTBASE_OFFSET, sizeof(GARTBASE_Config)); GARTBASE_Config.TT_NonCache = 1; WriteVIAConfig(&GARTBASE_Config, GATTBASE_OFFSET, sizeof(GARTBASE_Config)); ViaGartEnable(ON); AgpContext->GlobalEnable = TRUE; } MemoryBase->QuadPart = Range->MemoryBase.QuadPart + (Pte - StartPte) * PAGE_SIZE; return(STATUS_SUCCESS); } NTSTATUS AgpUnMapMemory( IN PAGPVIA_EXTENSION AgpContext, IN PAGP_RANGE AgpRange, IN ULONG NumberOfPages, IN ULONG PageOffset ) /*++ Routine Description: Unmaps previously mapped memory in the GART. Arguments: AgpContext - Supplies the AGP context AgpRange - Supplies the AGP range that the memory should be mapped into NumberOfPages - Supplies the number of pages in the range to be freed. PageOffset - Supplies the offset into the range where the freeing should begin. Return Value: NTSTATUS --*/ { ULONG i; PGART_PTE Pte; PGART_PTE LastChanged=NULL; PGART_PTE StartPte; ULONG NewState; PAGED_CODE(); ASSERT(PageOffset + NumberOfPages <= AgpRange->NumberOfPages); StartPte = AgpRange->Context; Pte = &StartPte[PageOffset]; if (AgpRange->Type == MmNonCached) { NewState = GART_ENTRY_RESERVED_UC; } else { NewState = GART_ENTRY_RESERVED_WC; } // // Flush TLB // AgpVIAFlushPageTLB(AgpContext); for (i=0; iAsUlong); } return(STATUS_SUCCESS); } PGART_PTE AgpVIAFindRangeInGart( IN PGART_PTE StartPte, IN PGART_PTE EndPte, IN ULONG Length, IN BOOLEAN SearchBackward, IN ULONG SearchState ) /*++ Routine Description: Finds a contiguous range in the GART. This routine can search either from the beginning of the GART forwards or the end of the GART backwards. Arguments: StartIndex - Supplies the first GART pte to search EndPte - Supplies the last GART to search (inclusive) Length - Supplies the number of contiguous free entries to search for. SearchBackward - TRUE indicates that the search should begin at EndPte and search backwards. FALSE indicates that the search should begin at StartPte and search forwards SearchState - Supplies the PTE state to look for. Return Value: Pointer to the first PTE in the GART if a suitable range is found. NULL if no suitable range exists. --*/ { PGART_PTE Current; PGART_PTE Last; LONG Delta; ULONG Found; PGART_PTE Candidate; PAGED_CODE(); ASSERT(EndPte >= StartPte); ASSERT(Length <= (ULONG)(EndPte - StartPte + 1)); ASSERT(Length != 0); if (SearchBackward) { Current = EndPte; Last = StartPte-1; Delta = -1; } else { Current = StartPte; Last = EndPte+1; Delta = 1; } Found = 0; while (Current != Last) { if (Current->Soft.State == SearchState) { if (++Found == Length) { // // A suitable range was found, return it // if (SearchBackward) { return(Current); } else { return(Current - Length + 1); } } } else { Found = 0; } Current += Delta; } // // A suitable range was not found. // return(NULL); } VOID AgpVIAFlushPageTLB( IN PAGPVIA_EXTENSION AgpContext ) /*++ Routine Description: Flush the AGP TLB (16 entries) if hardware does not support FLUSH TLB, then read Aperture 32 times Arguments: AgpContext - Supplies the AGP context Return Value: None --*/ { VIA_GART_TLB_CTRL GARTCTRL_Config; PAGED_CODE(); if (AgpContext->Cap_FlushTLB) { ReadVIAConfig(&GARTCTRL_Config, GARTCTRL_OFFSET, sizeof(GARTCTRL_Config)); //Flush TLB GARTCTRL_Config.FlushPageTLB = 1; WriteVIAConfig(&GARTCTRL_Config, GARTCTRL_OFFSET, sizeof(GARTCTRL_Config)); //Stop Flush TLB GARTCTRL_Config.FlushPageTLB = 0; WriteVIAConfig(&GARTCTRL_Config, GARTCTRL_OFFSET, sizeof(GARTCTRL_Config)); } else { AgpVIAFlushData(AgpContext); } } VOID AgpFindFreeRun( IN PVOID AgpContext, IN PAGP_RANGE AgpRange, IN ULONG NumberOfPages, IN ULONG OffsetInPages, OUT ULONG *FreePages, OUT ULONG *FreeOffset ) /*++ Routine Description: Finds the first contiguous run of free pages in the specified part of the reserved range. Arguments: AgpContext - Supplies the AGP context AgpRange - Supplies the AGP range NumberOfPages - Supplies the size of the region to be searched for free pages OffsetInPages - Supplies the start of the region to be searched for free pages FreePages - Returns the length of the first contiguous run of free pages FreeOffset - Returns the start of the first contiguous run of free pages Return Value: None. FreePages == 0 if there are no free pages in the specified range. --*/ { PGART_PTE Pte; ULONG i; PAGED_CODE(); Pte = (PGART_PTE)(AgpRange->Context) + OffsetInPages; // // Find the first free PTE // for (i=0; iByteCount); Pages = (PULONG)(Mdl + 1); Pte = (PGART_PTE)(AgpRange->Context) + OffsetInPages; for (i=0; iApertureStart, 32 * PAGE_SIZE, MmNonCached); ASSERT(ApertureVirtAddr != NULL); if (ApertureVirtAddr != NULL) { TempVirtualAddr = ApertureVirtAddr; for (Index = 0; Index < 32; Index++) { ReadData = *(PULONG)TempVirtualAddr; TempVirtualAddr = (PVOID)((PCCHAR)TempVirtualAddr + PAGE_SIZE); } MmUnmapIoSpace(ApertureVirtAddr, 32 * PAGE_SIZE); } else { AGPLOG(AGP_CRITICAL,("Agp440FlushPageTLB: Invalid address\n")); } } NTSTATUS AgpSpecialTarget( IN PAGPVIA_EXTENSION AgpContext, IN ULONGLONG DeviceFlags ) /*++ Routine Description: This routine makes "special" tweaks to the AGP chipset Arguments: AgpContext - Supplies the AGP context DeviceFlags - Flags indicating what tweaks to perform Return Value: STATUS_SUCCESS, or error --*/ { NTSTATUS Status; // // Should we change the AGP rate? // if (DeviceFlags & AGP_FLAG_SPECIAL_RESERVE) { Status = AgpVIASetRate(AgpContext, (ULONG)((DeviceFlags & AGP_FLAG_SPECIAL_RESERVE) >> AGP_FLAG_SET_RATE_SHIFT)); if (!NT_SUCCESS(Status)) { return Status; } } // // Add more tweaks here... // AgpContext->SpecialTarget |= DeviceFlags; return STATUS_SUCCESS; } NTSTATUS AgpVIASetRate( IN PAGPVIA_EXTENSION AgpContext, IN ULONG AgpRate ) /*++ Routine Description: This routine sets the AGP rate Arguments: AgpContext - Supplies the AGP context AgpRate - Rate to set note: this routine assumes that AGP has already been enabled, and that whatever rate we've been asked to set is supported by master Return Value: STATUS_SUCCESS, or error status --*/ { NTSTATUS Status; ULONG TargetEnable; ULONG MasterEnable; PCI_AGP_CAPABILITY TargetCap; PCI_AGP_CAPABILITY MasterCap; BOOLEAN ReverseInit; // // Read capabilities // Status = AgpLibGetPciDeviceCapability(0, 0, &TargetCap); if (!NT_SUCCESS(Status)) { AGPLOG(AGP_WARNING, ("AGPVIASetRate: AgpLibGetPciDeviceCapability " "failed %08lx\n", Status)); return Status; } Status = AgpLibGetMasterCapability(AgpContext, &MasterCap); if (!NT_SUCCESS(Status)) { AGPLOG(AGP_WARNING, ("AGPVIASetRate: AgpLibGetMasterCapability " "failed %08lx\n", Status)); return Status; } // // Verify the requested rate is supported by both master and target // if (!(AgpRate & TargetCap.AGPStatus.Rate & MasterCap.AGPStatus.Rate)) { return STATUS_INVALID_PARAMETER; } // // Disable AGP while the pull the rug out from underneath // TargetEnable = TargetCap.AGPCommand.AGPEnable; TargetCap.AGPCommand.AGPEnable = 0; Status = AgpLibSetPciDeviceCapability(0, 0, &TargetCap); if (!NT_SUCCESS(Status)) { AGPLOG(AGP_WARNING, ("AGPVIASetRate: AgpLibSetPciDeviceCapability %08lx for " "Target failed %08lx\n", &TargetCap, Status)); return Status; } MasterEnable = MasterCap.AGPCommand.AGPEnable; MasterCap.AGPCommand.AGPEnable = 0; Status = AgpLibSetMasterCapability(AgpContext, &MasterCap); if (!NT_SUCCESS(Status)) { AGPLOG(AGP_WARNING, ("AGPVIASetRate: AgpLibSetMasterCapability %08lx failed " "%08lx\n", &MasterCap, Status)); return Status; } // // Fire up AGP with new rate // ReverseInit = (AgpContext->SpecialTarget & AGP_FLAG_REVERSE_INITIALIZATION) == AGP_FLAG_REVERSE_INITIALIZATION; if (ReverseInit) { MasterCap.AGPCommand.Rate = AgpRate; MasterCap.AGPCommand.AGPEnable = MasterEnable; Status = AgpLibSetMasterCapability(AgpContext, &MasterCap); if (!NT_SUCCESS(Status)) { AGPLOG(AGP_WARNING, ("AGPVIASetRate: AgpLibSetMasterCapability %08lx failed " "%08lx\n", &MasterCap, Status)); } } TargetCap.AGPCommand.Rate = AgpRate; TargetCap.AGPCommand.AGPEnable = TargetEnable; Status = AgpLibSetPciDeviceCapability(0, 0, &TargetCap); if (!NT_SUCCESS(Status)) { AGPLOG(AGP_WARNING, ("AGPVIASetRate: AgpLibSetPciDeviceCapability %08lx for " "Target failed %08lx\n", &TargetCap, Status)); return Status; } if (!ReverseInit) { MasterCap.AGPCommand.Rate = AgpRate; MasterCap.AGPCommand.AGPEnable = MasterEnable; Status = AgpLibSetMasterCapability(AgpContext, &MasterCap); if (!NT_SUCCESS(Status)) { AGPLOG(AGP_WARNING, ("AGPVIASetRate: AgpLibSetMasterCapability %08lx failed " "%08lx\n", &MasterCap, Status)); } } return Status; }