104 lines
2 KiB
C
104 lines
2 KiB
C
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/*
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* xms.c - Main Module of XMS DLL.
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*
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* Sudeepb 15-May-1991 Craeted
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* williamh 25-Sept-1992 added UMB support
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* williamh 10-10-1992 added A20 line support
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*/
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#include <xms.h>
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#include <suballoc.h>
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#include "umb.h"
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#include "memapi.h"
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/* XMSInit - XMS Initialiazation routine. (This name may change when XMS is
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* converted to DLL).
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*
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* Entry
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* None
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*
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* Exit
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* None
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*/
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ULONG xmsMemorySize = (ULONG)0; // Total XMS meory in K
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extern BOOL VDMForWOW;
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PVOID ExtMemSA;
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BOOL XMSInit (int argc, char *argv[])
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{
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DWORD Size;
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PVOID Address;
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ULONG VdmAddress, XmsSize;
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NTSTATUS Status;
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if (!xmsMemorySize)
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return FALSE;
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Size = 0;
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Address = NULL;
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// commit all free UMBs.
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ReserveUMB(UMB_OWNER_RAM, &Address, &Size);
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XmsSize = xmsMemorySize * 1024 - (64*1024);
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#ifndef i386
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Status = VdmAllocateVirtualMemory(&VdmAddress,
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XmsSize,
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FALSE);
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if (Status == STATUS_NOT_IMPLEMENTED) {
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// Old emulator, just assume base address
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#endif ; //i386
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//
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// Initialize the sub allocator
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//
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ExtMemSA = SAInitialize(
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1024 * 1024 + 64*1024,
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XmsSize,
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xmsCommitBlock,
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xmsDecommitBlock,
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xmsMoveMemory
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);
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#ifndef i386
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} else {
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//
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// New emulator. Make sure the reserve worked
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//
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if (!NT_SUCCESS(Status)) {
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ASSERT(FALSE);
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return FALSE;
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}
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//
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// We only work correctly if emulator returned this value
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//
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if (VdmAddress != (1024 * 1024 + 64*1024)) {
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ASSERT(FALSE);
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return FALSE;
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}
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ExtMemSA = SAInitialize(
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VdmAddress,
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XmsSize,
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VdmCommitVirtualMemory,
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VdmDeCommitVirtualMemory,
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xmsMoveMemory
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);
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}
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#endif // i386
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if (ExtMemSA == NULL) {
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return FALSE;
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}
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return TRUE;
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}
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