ddk_map.c

来自「WinCE 3.0 BSP, 包含Inter SA1110, Intel_815」· C语言 代码 · 共 81 行

/*++
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.
Copyright (c) 1995-1998  Microsoft Corporation

Module Name:  

    ddk_map.c

Abstract:  

    WINCE device driver support routines.  This file supports
    a very minimal subset of the routines from ntddk.h

    
Functions:


Notes:

--*/
#include <windows.h>
#include <types.h>
#include "ceddk.h"

#define VERBOSE 0

// LAM - platform\cepc\wdmhal\wdmhal.c
PVOID
MmMapIoSpace (
             IN PHYSICAL_ADDRESS PhysicalAddress,
             IN ULONG NumberOfBytes,
             IN BOOLEAN CacheEnable
             )
{
    PVOID   pVirtualAddress;
    ULONG   SourcePhys;
    ULONG   SourceSize;
    BOOL    bSuccess;

    //
    // Page align source and adjust size to compensate
    //	

	//RETAILMSG (1, (TEXT("ddk_map.c:MmMapIoSpace():: Phy = 0x%x - NoOfBytes = %d - Cache = %d\r\n"),
	//	PhysicalAddress.LowPart, NumberOfBytes, CacheEnable));

    SourcePhys = PhysicalAddress.LowPart & ~(PAGE_SIZE - 1);
    SourceSize = NumberOfBytes + (PhysicalAddress.LowPart & (PAGE_SIZE - 1));

    pVirtualAddress = VirtualAlloc(0, SourceSize, MEM_RESERVE, PAGE_NOACCESS);

    if ( pVirtualAddress != NULL ) {
        bSuccess = VirtualCopy(
                              pVirtualAddress, (PVOID)(SourcePhys >> 8), SourceSize,
                              PAGE_PHYSICAL | PAGE_READWRITE | (CacheEnable ? 0 : PAGE_NOCACHE));

        if ( bSuccess ) {
            (ULONG)pVirtualAddress += PhysicalAddress.LowPart & (PAGE_SIZE - 1);
        } else {
            VirtualFree(pVirtualAddress, 0, MEM_RELEASE);
            pVirtualAddress = NULL;
        }
    }

    return (pVirtualAddress);
}

VOID
MmUnmapIoSpace (
               IN PVOID BaseAddress,
               IN ULONG NumberOfBytes
               )
{
    VirtualFree((PVOID)((ULONG)BaseAddress & ~(PAGE_SIZE - 1)), 0, MEM_RELEASE);
}