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reactos/subsystems/mvdm/ntvdm/bios/umamgr.c

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/*
* COPYRIGHT: GPLv2+ - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: subsystems/mvdm/ntvdm/bios/umamgr.c
* PURPOSE: Upper Memory Area Manager
* PROGRAMMERS: Hermes Belusca-Maito (hermes.belusca@sfr.fr)
*
* NOTE: The UMA Manager is used by the DOS XMS Driver (UMB Provider part),
* indirectly by the DOS EMS Driver, and by VDD memory management functions.
*/
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
#define NDEBUG
#include <debug.h>
#include "emulator.h"
#include "memory.h"
#include "umamgr.h"
/* PRIVATE VARIABLES **********************************************************/
typedef struct _UMA_DESCRIPTOR
{
LIST_ENTRY Entry;
ULONG Start;
ULONG Size;
UMA_DESC_TYPE Type;
} UMA_DESCRIPTOR, *PUMA_DESCRIPTOR;
/*
* Sorted list of UMA descriptors.
*
* The descriptor list is (and must always be) sorted by memory addresses,
* and all consecutive free descriptors are always merged together, so that
* free ones are always separated from each other by descriptors of other types.
*
* TODO: Add the fact that no blocks of size == 0 are allowed.
*/
static LIST_ENTRY UmaDescriptorList = { &UmaDescriptorList, &UmaDescriptorList };
/* PRIVATE FUNCTIONS **********************************************************/
static PUMA_DESCRIPTOR
CreateUmaDescriptor(IN OUT PLIST_ENTRY ListHead,
IN ULONG Address,
IN ULONG Size,
IN UMA_DESC_TYPE Type)
{
PUMA_DESCRIPTOR UmaDesc;
ASSERT(Size > 0);
UmaDesc = RtlAllocateHeap(RtlGetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*UmaDesc));
if (!UmaDesc) return NULL;
UmaDesc->Start = Address;
UmaDesc->Size = Size;
UmaDesc->Type = Type;
/*
* We use the trick of http://www.osronline.com/article.cfm?article=499 to insert
* the new descriptor just after the current entry that we specify via 'ListHead'.
* If 'ListHead' is NULL then we insert the descriptor at the tail of 'UmaDescriptorList'
* (which is equivalent to inserting it at the head of 'UmaDescriptorList.Blink').
*/
if (ListHead == NULL) ListHead = UmaDescriptorList.Blink;
InsertHeadList(ListHead, &UmaDesc->Entry);
return UmaDesc;
}
static VOID FreeUmaDescriptor(PUMA_DESCRIPTOR UmaDesc)
{
RemoveEntryList(&UmaDesc->Entry);
RtlFreeHeap(RtlGetProcessHeap(), 0, UmaDesc);
}
/* PUBLIC FUNCTIONS ***********************************************************/
BOOLEAN UmaDescReserve(IN OUT PUSHORT Segment, IN OUT PUSHORT Size)
{
ULONG Address = (*Segment << 4); // Convert segment number into address.
ULONG RequestSize = (*Size << 4); // Convert size in paragraphs into size in bytes.
ULONG MaxSize = 0;
PLIST_ENTRY Entry;
PUMA_DESCRIPTOR UmaDesc, NewUmaDesc;
PUMA_DESCRIPTOR FoundUmaDesc = NULL;
// FIXME: Check! What to do?
if (RequestSize == 0) DPRINT1("Requesting UMA descriptor with null size?!\n");
Entry = UmaDescriptorList.Flink;
while (Entry != &UmaDescriptorList)
{
UmaDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(Entry, UMA_DESCRIPTOR, Entry);
Entry = Entry->Flink;
/* Only check free descriptors */
if (UmaDesc->Type != UMA_FREE) continue;
/* Update the maximum descriptor size */
if (UmaDesc->Size > MaxSize) MaxSize = UmaDesc->Size;
/* Descriptor too small, continue... */
if (UmaDesc->Size < RequestSize) continue;
/* Do we want to reserve the descriptor at a precise address? */
if (Address)
{
/* If the descriptor ends before the desired region, try again */
if (UmaDesc->Start + UmaDesc->Size <= Address) continue;
/*
* If we have a descriptor, but one of its boundaries crosses the
* desired region (it starts after the desired region, or ends
* before the end of the desired region), this means that there
* is already something inside the region, so that we cannot
* allocate the region here. Bail out.
*/
if (UmaDesc->Start > Address ||
UmaDesc->Start + UmaDesc->Size < Address + RequestSize)
{
goto Fail;
}
/* We now have a free descriptor that overlaps our desired region: split it */
/*
* Here, UmaDesc->Start == Address or UmaDesc->Start < Address,
* in which case we need to split the descriptor to the left.
*/
if (UmaDesc->Start < Address)
{
/* Create a new free descriptor and insert it after the current one */
NewUmaDesc = CreateUmaDescriptor(&UmaDesc->Entry,
Address,
UmaDesc->Size - (Address - UmaDesc->Start),
UmaDesc->Type); // UMA_FREE
if (!NewUmaDesc)
{
DPRINT1("CreateUmaDescriptor failed, UMA descriptor list possibly corrupted!\n");
goto Fail;
}
/* Reduce the size of the splitted left descriptor */
UmaDesc->Size = (Address - UmaDesc->Start);
/* Current descriptor is now the new created one */
UmaDesc = NewUmaDesc;
}
/* Here, UmaDesc->Start == Address */
}
/* Descriptor of large enough size: split it to the right if needed */
// FIXME: It might be needed to consider a minimum size starting which we need to split.
// if (UmaDesc->Size - RequestSize > (3 << 4))
if (UmaDesc->Size > RequestSize)
{
/*
* Create a new free descriptor and insert it after the current one.
* Because consecutive free descriptors are always merged together,
* the descriptor following 'UmaDesc' cannot be free, so that this
* new free descriptor does not need to be merged with some others.
*/
NewUmaDesc = CreateUmaDescriptor(&UmaDesc->Entry,
UmaDesc->Start + RequestSize,
UmaDesc->Size - RequestSize,
UmaDesc->Type); // UMA_FREE
if (!NewUmaDesc)
{
DPRINT1("CreateUmaDescriptor failed, UMA descriptor list possibly corrupted!\n");
goto Fail;
}
/* Reduce the size of the splitted left descriptor */
UmaDesc->Size = RequestSize;
}
/* We have a descriptor of correct size, initialize it */
UmaDesc->Type = UMA_UMB;
FoundUmaDesc = UmaDesc;
break;
}
if (FoundUmaDesc)
{
/* Returned address is a segment and size is in paragraphs */
*Segment = (FoundUmaDesc->Start >> 4);
*Size = (FoundUmaDesc->Size >> 4);
return TRUE;
}
else
{
Fail:
/* Returned address is a segment and size is in paragraphs */
*Segment = 0x0000;
*Size = (MaxSize >> 4);
return FALSE;
}
}
BOOLEAN UmaDescRelease(IN USHORT Segment)
{
ULONG Address = (Segment << 4); // Convert segment number into address.
PLIST_ENTRY Entry, PrevEntry, NextEntry;
PUMA_DESCRIPTOR UmaDesc, PrevDesc = NULL, NextDesc = NULL;
PUMA_DESCRIPTOR FoundUmaDesc = NULL;
Entry = UmaDescriptorList.Flink;
while (Entry != &UmaDescriptorList)
{
UmaDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(Entry, UMA_DESCRIPTOR, Entry);
Entry = Entry->Flink;
/* Search for the descriptor in the list */
if (UmaDesc->Start == Address && UmaDesc->Type == UMA_UMB)
{
/* We found it */
FoundUmaDesc = UmaDesc;
break;
}
}
if (FoundUmaDesc)
{
FoundUmaDesc->Type = UMA_FREE;
/* Combine free descriptors adjacent to this one */
PrevEntry = FoundUmaDesc->Entry.Blink;
NextEntry = FoundUmaDesc->Entry.Flink;
if (PrevEntry != &UmaDescriptorList)
PrevDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(PrevEntry, UMA_DESCRIPTOR, Entry);
if (NextEntry != &UmaDescriptorList)
NextDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(NextEntry, UMA_DESCRIPTOR, Entry);
if (NextDesc && NextDesc->Type == FoundUmaDesc->Type) // UMA_FREE
{
FoundUmaDesc->Size += NextDesc->Size;
FreeUmaDescriptor(NextDesc);
}
if (PrevDesc && PrevDesc->Type == FoundUmaDesc->Type) // UMA_FREE
{
PrevDesc->Size += FoundUmaDesc->Size;
FreeUmaDescriptor(FoundUmaDesc);
}
return TRUE;
}
return FALSE;
}
BOOLEAN UmaDescReallocate(IN USHORT Segment, IN OUT PUSHORT Size)
{
ULONG Address = (Segment << 4); // Convert segment number into address.
ULONG RequestSize = (*Size << 4); // Convert size in paragraphs into size in bytes.
ULONG MaxSize = 0;
PLIST_ENTRY Entry, NextEntry;
PUMA_DESCRIPTOR UmaDesc, NextDesc = NULL, NewUmaDesc;
PUMA_DESCRIPTOR FoundUmaDesc = NULL;
// FIXME: Check! What to do?
if (RequestSize == 0) DPRINT1("Resizing UMA descriptor %04X to null size?!\n", Segment);
Entry = UmaDescriptorList.Flink;
while (Entry != &UmaDescriptorList)
{
UmaDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(Entry, UMA_DESCRIPTOR, Entry);
Entry = Entry->Flink;
/* Only get the maximum size of free descriptors */
if (UmaDesc->Type == UMA_FREE)
{
/* Update the maximum descriptor size */
if (UmaDesc->Size > MaxSize) MaxSize = UmaDesc->Size;
}
/* Search for the descriptor in the list */
if (UmaDesc->Start == Address && UmaDesc->Type == UMA_UMB)
{
/* We found it */
FoundUmaDesc = UmaDesc;
break;
}
}
if (FoundUmaDesc)
{
/* If we do not resize anything, just quit with success */
if (FoundUmaDesc->Size == RequestSize) goto Success;
NextEntry = FoundUmaDesc->Entry.Flink;
if (NextEntry != &UmaDescriptorList)
NextDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(NextEntry, UMA_DESCRIPTOR, Entry);
/* Check for reduction or enlargement */
if (FoundUmaDesc->Size > RequestSize)
{
/* Reduction */
/*
* Check if the next descriptor is free, in which case we
* extend it, otherwise we create a new free descriptor.
*/
if (NextDesc && NextDesc->Type == UMA_FREE)
{
/* Yes it is, expand its size and move it down */
NextDesc->Size += (FoundUmaDesc->Size - RequestSize);
NextDesc->Start -= (FoundUmaDesc->Size - RequestSize);
}
else
{
// FIXME: It might be needed to consider a minimum size starting which we need to split.
// if (FoundUmaDesc->Size - RequestSize > (3 << 4))
/* Create a new free descriptor and insert it after the current one */
NewUmaDesc = CreateUmaDescriptor(&FoundUmaDesc->Entry,
FoundUmaDesc->Start + RequestSize,
FoundUmaDesc->Size - RequestSize,
FoundUmaDesc->Type);
if (!NewUmaDesc)
{
DPRINT1("CreateUmaDescriptor failed, UMA descriptor list possibly corrupted!\n");
MaxSize = 0;
goto Fail;
}
}
}
else // if (FoundUmaDesc->Size <= RequestSize)
{
/* Enlargement */
/* Check whether the next descriptor is free and large enough for merging */
if (NextDesc && NextDesc->Type == UMA_FREE &&
FoundUmaDesc->Size + NextDesc->Size >= RequestSize)
{
/* Yes it is, reduce its size and move it up, and enlarge the reallocated descriptor */
NextDesc->Size -= (RequestSize - FoundUmaDesc->Size);
NextDesc->Start += (RequestSize - FoundUmaDesc->Size);
if (NextDesc->Size == 0) FreeUmaDescriptor(NextDesc);
}
else
{
MaxSize = 0;
goto Fail;
}
}
/* Finally, resize the descriptor */
FoundUmaDesc->Size = RequestSize;
Success:
/* Returned size is in paragraphs */
*Size = (FoundUmaDesc->Size >> 4);
return TRUE;
}
else
{
Fail:
/* Returned size is in paragraphs */
*Size = (MaxSize >> 4);
return FALSE;
}
}
BOOLEAN UmaMgrInitialize(VOID)
{
// See bios/rom.h
#define ROM_AREA_START 0xE0000
#define ROM_AREA_END 0xFFFFF
#define OPTION_ROM_SIGNATURE 0xAA55
PUMA_DESCRIPTOR UmaDesc = NULL;
ULONG StartAddress = 0;
ULONG Size = 0;
UMA_DESC_TYPE Type = UMA_FREE;
UINT i;
ULONG Start, End;
ULONG Increment;
ULONG Address;
// ULONG RomStart[] = {};
// ULONG RomEnd[] = {};
ULONG RomBoundaries[] = {0xA0000, 0xC0000, /*0xC8000, 0xE0000,*/ 0xF0000, 0x100000};
ULONG SizeIncrement[] = {0x20000, 0x00800, /*0x00800, 0x10000,*/ 0x10000, 0x0000 };
// InitializeListHead(&UmaDescriptorList);
/* NOTE: There must be always one UMA descriptor at least */
// FIXME: Maybe it should be a static object?
for (i = 0; i < ARRAYSIZE(RomBoundaries) - 1; i++)
{
Start = RomBoundaries[i]; // RomStart[i]
End = RomBoundaries[i+1]; // RomEnd[i]
Increment = SizeIncrement[i];
for (Address = Start; Address < End; Address += Increment)
{
if (StartAddress == 0)
{
/* Initialize data for a new descriptor */
StartAddress = Address;
Size = 0;
Type = UMA_FREE;
}
/* Is it a normal system zone/user-excluded zone? */
if (Address >= 0xA0000 && Address < 0xC0000)
{
// StartAddress = Address;
Size = Increment;
Type = UMA_SYSTEM;
/* Create descriptor */
UmaDesc = CreateUmaDescriptor(NULL, StartAddress, Size, Type);
if (!UmaDesc) return FALSE;
StartAddress = 0;
continue;
}
/* Is it the PC ROM BIOS? */
else if (Address >= 0xF0000)
{
// StartAddress = Address;
Size = 0x10000; // Increment;
Type = UMA_ROM;
/* Create descriptor */
UmaDesc = CreateUmaDescriptor(NULL, StartAddress, Size, Type);
if (!UmaDesc) return FALSE;
StartAddress = 0;
continue;
}
/* Is it an option ROM? */
else if (Address >= 0xC0000 && Address < 0xF0000)
{
ULONG RomSize;
ULONG PrevRomAddress = 0;
ULONG PrevRomSize = 0;
// while (Address < 0xF0000)
for (; Address < 0xF0000; Address += Increment)
{
#if 0 // FIXME: Is this block, better here...
{
// We may be looping inside a ROM block, if: Type == 2 and:
// (StartAddress <= Address &&) StartAddress + Size > Address.
// In this case, do nothing (do not increase size either)
// But if we are now outside of a ROM block, then we need
// to create the previous block, and initialize a new empty one!
// (and following the next passages, increase its size).
// if (StartAddress < Address && Type != 2)
if (Type == UMA_ROM && StartAddress + Size > Address)
{
/* We are inside ROM, do nothing */
}
else if (Type == UMA_ROM && StartAddress + Size <= Address)
{
/* We finished a ROM descriptor */
/* Create descriptor */
UmaDesc = CreateUmaDescriptor(NULL, StartAddress, Size, Type);
if (!UmaDesc) return FALSE;
StartAddress = 0;
// goto Restart;
}
else if (Type != UMA_ROM)
{
Size += Increment;
}
}
#endif
Restart:
/// if (Address >= 0xE0000) { Increment = 0x10000; }
if (StartAddress == 0)
{
/* Initialize data for a new descriptor */
StartAddress = Address;
Size = 0;
Type = UMA_FREE;
PrevRomAddress = 0;
PrevRomSize = 0;
}
if (*(PUSHORT)REAL_TO_PHYS(Address) == OPTION_ROM_SIGNATURE)
{
/*
* If this is an adapter ROM (Start: C8000, End: E0000),
* its reported size is stored in byte 2 of the ROM.
*
* If this is an expansion ROM (Start: E0000, End: F0000),
* its real length is 64kB.
*/
RomSize = *(PUCHAR)REAL_TO_PHYS(Address + 2) * 512;
// if (Address >= 0xE0000) RomSize = 0x10000;
if (Address >= 0xE0000) { RomSize = 0x10000; Increment = RomSize; }
DPRINT1("ROM present @ address 0x%p\n", Address);
if (StartAddress != 0 && Size != 0 &&
StartAddress + Size <= Address)
{
/* Finish old descriptor */
UmaDesc = CreateUmaDescriptor(NULL, StartAddress, Size, Type);
if (!UmaDesc) return FALSE;
}
/*
* We may have overlapping ROMs, when PrevRomAddress + PrevRomSize > RomAddress.
* They must be put inside the same UMA descriptor.
*/
if (PrevRomAddress + PrevRomSize > /*Rom*/Address)
{
// Overlapping ROM
/*
* PrevRomAddress remains the same, but adjust
* PrevRomSize (ROM descriptors merging).
*/
PrevRomSize = max(PrevRomSize, RomSize + Address - PrevRomAddress);
// FIX: Confirm that the start address is really
// the one of the previous descriptor.
StartAddress = PrevRomAddress;
Size = PrevRomSize;
Type = UMA_ROM;
}
else
{
// Non-overlapping ROM
PrevRomAddress = Address;
PrevRomSize = RomSize;
/* Initialize a new descriptor. We will create it when it's OK */
StartAddress = Address;
Size = RomSize;
Type = UMA_ROM;
// continue;
}
}
#if 1 // FIXME: ...or there??
else
{
// We may be looping inside a ROM block, if: Type == 2 and:
// (StartAddress <= Address &&) StartAddress + Size > Address.
// In this case, do nothing (do not increase size either)
// But if we are now outside of a ROM block, then we need
// to create the previous block, and initialize a new empty one!
// (and following the next passages, increase its size).
// if (StartAddress < Address && Type != UMA_ROM)
if (Type == UMA_ROM && StartAddress + Size > Address)
{
// We are inside ROM, do nothing
}
else if (Type == UMA_ROM && StartAddress + Size <= Address)
{
// We finished a ROM descriptor.
/* Create descriptor */
UmaDesc = CreateUmaDescriptor(NULL, StartAddress, Size, Type);
if (!UmaDesc) return FALSE;
StartAddress = 0;
goto Restart;
}
else if (Type != UMA_ROM)
{
Size += Increment;
}
}
#endif
// Fixed incroment; we may encounter again overlapping ROMs, etc.
// Address += Increment;
}
if (StartAddress != 0 && Size != 0)
{
/* Create descriptor */
UmaDesc = CreateUmaDescriptor(NULL, StartAddress, Size, Type);
if (!UmaDesc) return FALSE;
StartAddress = 0;
}
}
}
}
return TRUE;
}
VOID UmaMgrCleanup(VOID)
{
PUMA_DESCRIPTOR UmaDesc;
while (!IsListEmpty(&UmaDescriptorList))
{
UmaDesc = (PUMA_DESCRIPTOR)CONTAINING_RECORD(UmaDescriptorList.Flink, UMA_DESCRIPTOR, Entry);
FreeUmaDescriptor(UmaDesc);
}
}
/* EOF */
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