mirror of
https://github.com/reactos/reactos.git
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116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/* $Id$
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*
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* ReactOS Project
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*/
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#include <csrss.h>
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#define NDEBUG
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#include <debug.h>
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ULONG
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InitializeVideoAddressSpace(VOID)
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{
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OBJECT_ATTRIBUTES ObjectAttributes;
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UNICODE_STRING PhysMemName = RTL_CONSTANT_STRING(L"\\Device\\PhysicalMemory");
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NTSTATUS Status;
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HANDLE PhysMemHandle;
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PVOID BaseAddress;
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PVOID NullAddress;
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LARGE_INTEGER Offset;
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ULONG ViewSize;
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CHAR IVTAndBda[1024+256];
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/*
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* Open the physical memory section
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*/
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InitializeObjectAttributes(&ObjectAttributes,
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&PhysMemName,
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0,
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NULL,
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NULL);
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Status = ZwOpenSection(&PhysMemHandle, SECTION_ALL_ACCESS,
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&ObjectAttributes);
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if (!NT_SUCCESS(Status))
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{
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DbgPrint("Couldn't open \\Device\\PhysicalMemory\n");
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return(0);
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}
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/*
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* Map the BIOS and device registers into the address space
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*/
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Offset.QuadPart = 0xa0000;
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ViewSize = 0x100000 - 0xa0000;
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BaseAddress = (PVOID)0xa0000;
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Status = NtMapViewOfSection(PhysMemHandle,
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NtCurrentProcess(),
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&BaseAddress,
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0,
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8192,
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&Offset,
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&ViewSize,
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ViewUnmap,
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0,
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PAGE_EXECUTE_READWRITE);
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if (!NT_SUCCESS(Status))
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{
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DbgPrint("Couldn't map physical memory (%x)\n", Status);
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NtClose(PhysMemHandle);
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return(0);
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}
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NtClose(PhysMemHandle);
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if (BaseAddress != (PVOID)0xa0000)
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{
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DbgPrint("Couldn't map physical memory at the right address "
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"(was %x)\n", BaseAddress);
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return(0);
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}
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/*
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* Map some memory to use for the non-BIOS parts of the v86 mode address
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* space
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*/
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BaseAddress = (PVOID)0x1;
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ViewSize = 0xa0000 - 0x1000;
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Status = ZwAllocateVirtualMemory(NtCurrentProcess(),
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&BaseAddress,
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0,
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&ViewSize,
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MEM_COMMIT,
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PAGE_EXECUTE_READWRITE);
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if (!NT_SUCCESS(Status))
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{
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DbgPrint("Failed to allocate virtual memory (Status %x)\n", Status);
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return(0);
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}
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if (BaseAddress != (PVOID)0x0)
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{
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DbgPrint("Failed to allocate virtual memory at right address "
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"(was %x)\n", BaseAddress);
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return(0);
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}
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/*
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* Get the real mode IVT and BDA from the kernel
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*/
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Status = NtVdmControl(VdmInitialize, IVTAndBda);
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if (!NT_SUCCESS(Status))
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{
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DbgPrint("NtVdmControl failed (status %x)\n", Status);
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return(0);
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}
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/*
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* Copy the IVT and BDA into the right place
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*/
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NullAddress = (PVOID)0x0; /* Workaround for GCC 3.4 */
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memcpy(NullAddress, IVTAndBda, 1024);
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memcpy((PVOID)0x400, &IVTAndBda[1024], 256);
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return(1);
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}
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/* EOF */
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