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windows-nt/Source/XPSP1/NT/base/busdrv/agp/agp440/gart.c

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/*++
Copyright (c) 1997 Microsoft Corporation
Module Name:
gart.c
Abstract:
Routines for querying and setting the Intel 440xx GART aperture
Author:
John Vert (jvert) 10/30/1997
Revision History:
--*/
#include "agp440.h"
//
// Local function prototypes
//
NTSTATUS
Agp440CreateGart(
IN PAGP440_EXTENSION AgpContext,
IN ULONG MinimumPages
);
PGART_PTE
Agp440FindRangeInGart(
IN PGART_PTE StartPte,
IN PGART_PTE EndPte,
IN ULONG Length,
IN BOOLEAN SearchBackward,
IN ULONG SearchState
);
NTSTATUS
Agp440SetRate(
IN PVOID AgpContext,
IN ULONG AgpRate
);
VOID
Agp440SetGTLB_Enable(
IN PAGP440_EXTENSION AgpContext,
IN BOOLEAN Enable
);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, AgpDisableAperture)
#pragma alloc_text(PAGE, AgpQueryAperture)
#pragma alloc_text(PAGE, AgpReserveMemory)
#pragma alloc_text(PAGE, AgpReleaseMemory)
#pragma alloc_text(PAGE, Agp440CreateGart)
#pragma alloc_text(PAGE, AgpMapMemory)
#pragma alloc_text(PAGE, AgpUnMapMemory)
#pragma alloc_text(PAGE, Agp440FindRangeInGart)
#pragma alloc_text(PAGE, AgpFindFreeRun)
#pragma alloc_text(PAGE, AgpGetMappedPages)
#endif
#define Agp440EnableTB(_x_) Agp440SetGTLB_Enable((_x_), TRUE)
#define Agp440DisableTB(_x_) Agp440SetGTLB_Enable((_x_), FALSE)
NTSTATUS
AgpQueryAperture(
IN PAGP440_EXTENSION AgpContext,
OUT PHYSICAL_ADDRESS *CurrentBase,
OUT ULONG *CurrentSizeInPages,
OUT OPTIONAL PIO_RESOURCE_LIST *pApertureRequirements
)
/*++
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 ApBase;
UCHAR ApSize;
PIO_RESOURCE_LIST Requirements;
ULONG i;
ULONG Length;
PAGED_CODE();
//
// Get the current APBASE and APSIZE settings
//
Read440Config(&ApBase, APBASE_OFFSET, sizeof(ApBase));
Read440Config(&ApSize, APSIZE_OFFSET, sizeof(ApSize));
ASSERT(ApBase != 0);
CurrentBase->QuadPart = ApBase & PCI_ADDRESS_MEMORY_ADDRESS_MASK;
//
// Convert APSIZE into the actual size of the aperture
//
switch (ApSize) {
case AP_SIZE_4MB:
*CurrentSizeInPages = 4 * (1024*1024 / PAGE_SIZE);
break;
case AP_SIZE_8MB:
*CurrentSizeInPages = 8 * (1024*1024 / PAGE_SIZE);
break;
case AP_SIZE_16MB:
*CurrentSizeInPages = 16 * (1024*1024 / PAGE_SIZE);
break;
case AP_SIZE_32MB:
*CurrentSizeInPages = 32 * (1024*1024 / PAGE_SIZE);
break;
case AP_SIZE_64MB:
*CurrentSizeInPages = 64 * (1024*1024 / PAGE_SIZE);
break;
case AP_SIZE_128MB:
*CurrentSizeInPages = 128 * (1024*1024 / PAGE_SIZE);
break;
case AP_SIZE_256MB:
*CurrentSizeInPages = 256 * (1024*1024 / PAGE_SIZE);
break;
default:
AGPLOG(AGP_CRITICAL,
("AGP440 - AgpQueryAperture - Unexpected value %x for ApSize!\n",
ApSize));
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 (pApertureRequirements != NULL) {
ULONG VendorId;
//
// 440 supports 7 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) + (AP_SIZE_COUNT-1)*sizeof(IO_RESOURCE_DESCRIPTOR),
'RpgA');
if (Requirements == NULL) {
return(STATUS_INSUFFICIENT_RESOURCES);
}
Requirements->Version = Requirements->Revision = 1;
//
// 815 only supports 64MB and 32MB Aperture sizes
//
Read440Config(&VendorId, 0, sizeof(VendorId));
if (VendorId == AGP_815_IDENTIFIER) {
Requirements->Count = AP_815_SIZE_COUNT;
Length = AP_815_MAX_SIZE;
} else {
Requirements->Count = AP_SIZE_COUNT;
Length = AP_MAX_SIZE;
}
for (i=0; i<Requirements->Count; i++) {
Requirements->Descriptors[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;
}
*pApertureRequirements = Requirements;
}
return(STATUS_SUCCESS);
}
NTSTATUS
AgpSetAperture(
IN PAGP440_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
--*/
{
PACCFG PACConfig;
UCHAR ApSize;
ULONG ApBase;
//
// Figure out the new APSIZE setting, make sure it is valid.
//
switch (NewSizeInPages) {
case 4 * 1024 * 1024 / PAGE_SIZE:
ApSize = AP_SIZE_4MB;
break;
case 8 * 1024 * 1024 / PAGE_SIZE:
ApSize = AP_SIZE_8MB;
break;
case 16 * 1024 * 1024 / PAGE_SIZE:
ApSize = AP_SIZE_16MB;
break;
case 32 * 1024 * 1024 / PAGE_SIZE:
ApSize = AP_SIZE_32MB;
break;
case 64 * 1024 * 1024 / PAGE_SIZE:
ApSize = AP_SIZE_64MB;
break;
case 128 * 1024 * 1024 / PAGE_SIZE:
ApSize = AP_SIZE_128MB;
break;
case 256 * 1024 * 1024 / PAGE_SIZE:
ApSize = AP_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
//
Read440Config(&PACConfig, PACCFG_OFFSET, sizeof(PACConfig));
PACConfig.GlobalEnable = 0;
Write440Config(&PACConfig, PACCFG_OFFSET, sizeof(PACConfig));
//
// Write APSIZE first, as this will enable the correct bits in APBASE that need to
// be written next.
//
Write440Config(&ApSize, APSIZE_OFFSET, sizeof(ApSize));
//
// Now we can update APBASE
//
ApBase = NewBase.LowPart & PCI_ADDRESS_MEMORY_ADDRESS_MASK;
Write440Config(&ApBase, APBASE_OFFSET, sizeof(ApBase));
#if DBG
//
// Read back what we wrote, make sure it worked
//
{
ULONG DbgBase;
UCHAR DbgSize;
Read440Config(&DbgSize, APSIZE_OFFSET, sizeof(ApSize));
Read440Config(&DbgBase, APBASE_OFFSET, sizeof(ApBase));
ASSERT(DbgSize == ApSize);
ASSERT((DbgBase & PCI_ADDRESS_MEMORY_ADDRESS_MASK) == ApBase);
}
#endif
//
// Now enable the aperture if it was enabled before
//
if (AgpContext->GlobalEnable) {
Read440Config(&PACConfig, PACCFG_OFFSET, sizeof(PACConfig));
ASSERT(PACConfig.GlobalEnable == 0);
PACConfig.GlobalEnable = 1;
Write440Config(&PACConfig, PACCFG_OFFSET, sizeof(PACConfig));
}
//
// 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
//
Agp440EnableTB(AgpContext);
//
// If the GART has been allocated, rewrite the ATTBASE
//
if (AgpContext->Gart != NULL) {
Write440Config(&AgpContext->GartPhysical.LowPart,
ATTBASE_OFFSET,
sizeof(AgpContext->GartPhysical.LowPart));
}
return(STATUS_SUCCESS);
}
VOID
AgpDisableAperture(
IN PAGP440_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.
--*/
{
PACCFG PACConfig;
//
// Disable the aperture
//
Read440Config(&PACConfig, PACCFG_OFFSET, sizeof(PACConfig));
if (PACConfig.GlobalEnable == 1) {
PACConfig.GlobalEnable = 0;
Write440Config(&PACConfig, PACCFG_OFFSET, sizeof(PACConfig));
}
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 PAGP440_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));
if (Range->NumberOfPages > (AgpContext->ApertureLength / PAGE_SIZE)) {
return STATUS_INSUFFICIENT_RESOURCES;
}
//
// If we have not allocated our GART yet, now is the time to do so
//
if (AgpContext->Gart == NULL) {
ASSERT(AgpContext->GartLength == 0);
Status = Agp440CreateGart(AgpContext,Range->NumberOfPages);
if (!NT_SUCCESS(Status)) {
AGPLOG(AGP_CRITICAL,
("Agp440CreateGart 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 = Agp440FindRangeInGart(&AgpContext->Gart[0],
&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 PAGP440_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);
}
NTSTATUS
Agp440CreateGart(
IN PAGP440_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
--*/
{
PGART_PTE Gart;
ULONG GartLength;
PHYSICAL_ADDRESS HighestAcceptable;
PHYSICAL_ADDRESS LowestAcceptable;
PHYSICAL_ADDRESS BoundaryMultiple;
PHYSICAL_ADDRESS GartPhysical;
ULONG i;
PAGED_CODE();
//
// Try and get a chunk of contiguous memory big enough to map the
// entire aperture.
//
LowestAcceptable.QuadPart = 0;
BoundaryMultiple.QuadPart = 0;
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,
("Agp440CreateGart - MmAllocateContiguousMemorySpecifyCache %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,
("Agp440CreateGart - GART of length %lx created at VA %08lx, PA %08lx\n",
GartLength,
Gart,
GartPhysical.LowPart));
ASSERT(GartPhysical.HighPart == 0);
ASSERT((GartPhysical.LowPart & (PAGE_SIZE-1)) == 0);
//
// Initialize all the PTEs to free
//
for (i=0; i<GartLength/sizeof(GART_PTE); i++) {
Gart[i].Soft.State = GART_ENTRY_FREE;
}
Write440Config(&GartPhysical.LowPart, ATTBASE_OFFSET, sizeof(GartPhysical.LowPart));
//
// Update our extension to reflect the current state.
//
AgpContext->Gart = Gart;
AgpContext->GartLength = GartLength;
AgpContext->GartPhysical = GartPhysical;
return(STATUS_SUCCESS);
}
NTSTATUS
AgpMapMemory(
IN PAGP440_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
OffsetInPages - Supplies the offset into the reserved range where the
mapping should begin.
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;
PPFN_NUMBER Page;
BOOLEAN Backwards;
GART_PTE NewPte;
PACCFG PACConfig;
PAGED_CODE();
ASSERT(Mdl->Next == NULL);
StartPte = Range->Context;
PageCount = BYTES_TO_PAGES(Mdl->ByteCount);
ASSERT(PageCount <= Range->NumberOfPages);
ASSERT(OffsetInPages <= Range->NumberOfPages);
ASSERT(PageCount + OffsetInPages <= 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 = (PPFN_NUMBER)(Mdl + 1);
//
// Disable the TB as per the 440 spec. This is probably unnecessary
// as there should be no valid entries in this range, and there should
// be no invalid entries still in the TB. So flushing the TB seems
// a little gratuitous but that's what the 440 spec says to do.
//
Agp440DisableTB(AgpContext);
for (Index = 0; Index < PageCount; Index++) {
ASSERT(Pte[Index].Soft.State == TargetState);
NewPte.Hard.Page = (ULONG)(*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;
//
// Re-enable the TB
//
Agp440EnableTB(AgpContext);
//
// If we have not yet gotten around to enabling the GART aperture, do it now.
//
if (!AgpContext->GlobalEnable) {
AGPLOG(AGP_NOISE,
("AgpMapMemory - Enabling global aperture access\n"));
Read440Config(&PACConfig, PACCFG_OFFSET, sizeof(PACConfig));
PACConfig.GlobalEnable = 1;
Write440Config(&PACConfig, PACCFG_OFFSET, sizeof(PACConfig));
AgpContext->GlobalEnable = TRUE;
}
MemoryBase->QuadPart = Range->MemoryBase.QuadPart + (Pte - StartPte) * PAGE_SIZE;
return(STATUS_SUCCESS);
}
NTSTATUS
AgpUnMapMemory(
IN PAGP440_EXTENSION AgpContext,
IN PAGP_RANGE AgpRange,
IN ULONG NumberOfPages,
IN ULONG OffsetInPages
)
/*++
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 freed from
NumberOfPages - Supplies the number of pages in the range to be freed.
OffsetInPages - 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(OffsetInPages + NumberOfPages <= AgpRange->NumberOfPages);
StartPte = AgpRange->Context;
Pte = &StartPte[OffsetInPages];
if (AgpRange->Type == MmNonCached) {
NewState = GART_ENTRY_RESERVED_UC;
} else {
NewState = GART_ENTRY_RESERVED_WC;
}
//
// Disable the TB to flush it
//
Agp440DisableTB(AgpContext);
for (i=0; i<NumberOfPages; i++) {
if (Pte[i].Hard.Valid) {
Pte[i].Soft.State = NewState;
LastChanged = Pte;
} else {
//
// This page is not mapped, just skip it.
//
AGPLOG(AGP_NOISE,
("AgpUnMapMemory - PTE %08lx (%08lx) at offset %d not mapped\n",
&Pte[i],
Pte[i].AsUlong,
i));
ASSERT(Pte[i].Soft.State == NewState);
}
}
//
// We have invalidated all the PTEs. Read back the last one we wrote
// in order to flush the write buffers.
//
if (LastChanged != NULL) {
ULONG Temp;
Temp = *(volatile ULONG *)(&LastChanged->AsUlong);
}
//
// Reenable the TB
//
Agp440EnableTB(AgpContext);
return(STATUS_SUCCESS);
}
PGART_PTE
Agp440FindRangeInGart(
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
Agp440SetGTLB_Enable(
IN PAGP440_EXTENSION AgpContext,
IN BOOLEAN Enable
)
/*++
Routine Description:
Enables or disables the GTLB by setting or clearing the GTLB_Enable bit
in the AGPCTRL register
Arguments:
AgpContext - Supplies the AGP context
Enable - TRUE, GTLB_Enable is set to 1
FALSE, GTLB_Enable is set to 0
Return Value:
None
--*/
{
AGPCTRL AgpCtrl;
Read440Config(&AgpCtrl, AGPCTRL_OFFSET, sizeof(AgpCtrl));
if (Enable) {
AgpCtrl.GTLB_Enable = 1;
} else {
AgpCtrl.GTLB_Enable = 0;
}
Write440Config(&AgpCtrl, AGPCTRL_OFFSET, sizeof(AgpCtrl));
}
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;
Pte = (PGART_PTE)(AgpRange->Context) + OffsetInPages;
//
// Find the first free PTE
//
for (i=0; i<NumberOfPages; i++) {
if (Pte[i].Hard.Valid == 0) {
//
// Found a free PTE, count the contiguous ones.
//
*FreeOffset = i + OffsetInPages;
*FreePages = 0;
while ((i<NumberOfPages) && (Pte[i].Hard.Valid == 0)) {
*FreePages += 1;
++i;
}
return;
}
}
//
// No free PTEs in the specified range
//
*FreePages = 0;
return;
}
VOID
AgpGetMappedPages(
IN PVOID AgpContext,
IN PAGP_RANGE AgpRange,
IN ULONG NumberOfPages,
IN ULONG OffsetInPages,
OUT PMDL Mdl
)
/*++
Routine Description:
Returns the list of physical pages mapped into the specified
range in the GART.
Arguments:
AgpContext - Supplies the AGP context
AgpRange - Supplies the AGP range
NumberOfPages - Supplies the number of pages to be returned
OffsetInPages - Supplies the start of the region
Mdl - Returns the list of physical pages mapped in the specified range.
Return Value:
None
--*/
{
PGART_PTE Pte;
ULONG i;
PULONG Pages;
ASSERT(NumberOfPages * PAGE_SIZE == Mdl->ByteCount);
Pages = (PULONG)(Mdl + 1);
Pte = (PGART_PTE)(AgpRange->Context) + OffsetInPages;
for (i=0; i<NumberOfPages; i++) {
ASSERT(Pte[i].Hard.Valid == 1);
Pages[i] = Pte[i].Hard.Page;
}
return;
}
NTSTATUS
AgpSpecialTarget(
IN PAGP440_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 = Agp440SetRate(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
Agp440SetRate(
IN PAGP440_EXTENSION AgpContext,
IN ULONG AgpRate
)
/*++
Routine Description:
This routine sets the AGP rate
Arguments:
AgpContext - Supplies the AGP context
AgpRate - Rate to set
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, ("AGP440SetRate: AgpLibGetPciDeviceCapability "
"failed %08lx\n", Status));
return Status;
}
Status = AgpLibGetMasterCapability(AgpContext, &MasterCap);
if (!NT_SUCCESS(Status)) {
AGPLOG(AGP_WARNING, ("AGP440SetRate: 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,
("AGP440SetRate: 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,
("AGP440SetRate: 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,
("AGP440SetRate: 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,
("AGP440SetRate: 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,
("AGP440SetRate: AgpLibSetMasterCapability %08lx failed "
"%08lx\n",
&MasterCap,
Status));
}
}
return Status;
}
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