ramdisk.h File Reference

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Functions
ARC_STATUS	RamDiskInitialize (IN BOOLEAN InitRamDisk, IN PCSTR LoadOptions OPTIONAL, IN PCSTR DefaultPath OPTIONAL)

Variables
PVOID	gInitRamDiskBase
ULONG	gInitRamDiskSize

Function Documentation

RamDiskInitialize()

ARC_STATUS RamDiskInitialize	(	IN BOOLEAN	InitRamDisk,
		IN PCSTR LoadOptions	OPTIONAL,
		IN PCSTR DefaultPath	OPTIONAL
	)

Definition at line 206 of file ramdisk.c.

{
    /* Reset the RAMDISK device */
    if ((RamDiskBase != gInitRamDiskBase) &&
        (RamDiskFileSize != gInitRamDiskSize) &&
        (gInitRamDiskSize != 0))
    {
        /* This is not the initial Ramdisk, so we can free the allocated memory */
        MmFreeMemory(RamDiskBase);
    }
    RamDiskBase = NULL;
    RamDiskFileSize = 0;
    RamDiskImageLength = 0;
    RamDiskImageOffset = 0;
    RamDiskOffset = 0;
 
    if (InitRamDisk)
    {
        /* We initialize the initial Ramdisk: it should be present in memory */
        if (!gInitRamDiskBase || gInitRamDiskSize == 0)
            return ENODEV;
 
        // TODO: Handle SDI image.
 
        RamDiskBase = gInitRamDiskBase;
        RamDiskFileSize = gInitRamDiskSize;
        ASSERT(RamDiskFileSize < 0x100000000); // See FIXME about 4GB support in RamDiskLoadVirtualFile().
    }
    else
    {
        /* We initialize the Ramdisk from the load options */
        ARC_STATUS Status;
        CHAR FileName[MAX_PATH] = "";
 
        /* If we don't have any load options, initialize an empty Ramdisk */
        if (LoadOptions)
        {
            PCSTR Option;
            ULONG FileNameLength;
 
            /* Ramdisk image file name */
            Option = NtLdrGetOptionEx(LoadOptions, "RDPATH=", &FileNameLength);
            if (Option && (FileNameLength > 7))
            {
                /* Copy the file name */
                Option += 7; FileNameLength -= 7;
                RtlStringCbCopyNA(FileName, sizeof(FileName),
                                  Option, FileNameLength * sizeof(CHAR));
            }
 
            /* Ramdisk image length */
            Option = NtLdrGetOption(LoadOptions, "RDIMAGELENGTH=");
            if (Option)
            {
                RamDiskImageLength = _atoi64(Option + 14);
            }
 
            /* Ramdisk image offset */
            Option = NtLdrGetOption(LoadOptions, "RDIMAGEOFFSET=");
            if (Option)
            {
                RamDiskImageOffset = atol(Option + 14);
            }
        }
 
        if (*FileName)
        {
            Status = RamDiskLoadVirtualFile(FileName, DefaultPath);
            if (Status != ESUCCESS)
                return Status;
        }
    }
 
    /* Adjust the Ramdisk image length if needed */
    if (!RamDiskImageLength || (RamDiskImageLength > RamDiskFileSize - RamDiskImageOffset))
        RamDiskImageLength = RamDiskFileSize - RamDiskImageOffset;
 
    /* Register the RAMDISK device */
    if (!RamDiskDeviceRegistered)
    {
        FsRegisterDevice("ramdisk(0)", &RamDiskVtbl);
        RamDiskDeviceRegistered = TRUE;
    }
 
    return ESUCCESS;
}

Referenced by ArmHwDetect(), LoadAndBootWindows(), and LoadReactOSSetup().

Variable Documentation

gInitRamDiskBase

PVOID gInitRamDiskBase

extern

Definition at line 17 of file ramdisk.c.

Referenced by CmdLineParse(), and RamDiskInitialize().

gInitRamDiskSize

ULONG gInitRamDiskSize

extern

Definition at line 18 of file ramdisk.c.

Referenced by CmdLineParse(), and RamDiskInitialize().